Severe Memory Leak in 10.1.0.3
Hi,
There exists a severe leak of element names (QxName), when garbage collecting elements, which has been constructed as;
XMLDocument doc = new XMLDocument();
doc.createElement("AnyName");
After GC references in oracle.xml.util.QxNameHash$WeakValue still exists.
It's very easy to reproduce;
for (;;) {
XMLDocument doc = new XMLDocument();
doc.createElement("AnyName");
thanks,
-- peter
We are building products, which relies on Oracle XML technology, and this is a major issue (P1) in large 7/24 production systems. Would
appreciate any suggestion to work-around...
Additional information;
First a minor correction, the actual leak is not direct references element names, but rather weak references (left after GC) to such names (each weak reference allocates 32 bytes).
In our system the leak is approx. 0.67 MB/hour, or 16MB during a 24h period, and it processes about 100 XML documents/second.
The problem seems to be very trivial (deep knowledge in Java and GC is not required, even though the semantics of weak references is a bit fuzzy), and I really hope you guys will take an appropriate action...
thanks,
-- peter
PS My previous example works fine in the OptimizeIT tool, due to the specific GC behavior. If you'll do the same in a plain JVM, then it's best to reduce the heap size, and allocate something large before creating the XML element.
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B1&&C2 28;D12 15 37 25 8;A1 0 $((N1+2)) 3;C0;D13 0 $((N1+3)) 4 3;D23 0 $((N1+4)) 5 4;for i in 0 1 2;do D13 0 $((N1+5+i)) 6 $((N3+i));done;D13 1 10 7 9;D13 1 11 8 10;D22 2 12 9 11;D12 3 13 10 12;D23 4 19 44 13;D23 5 14 12 14;D22 6 36 13 15;D22 7 37 14 16;D23 8 15 38 17;D22 9 16 16 18;B1&&{ D22 11 17 17 20;for i in 0 1;do D22 28 $((N2+i)) 45 $((N4+i));done;};D22 12 44 54 45;D22 12 39 15 21;A1 13 40 18;B2 4;B3 4 0 19;A3 14 6 32 0;B4 0 5 11;A1 17 41 20;B7 5;C3 22;B4 4 6 21;A3 14 7 32 6;B4 0 7 11;B3 4 0 22;A3 14 6 32 0;B4 0 8 11;B5 7 8;B1&&{ A2 19 26 23;B7 7;C3 23;};A2 18 26 23;B7 7;C3 24;A2 4 20 21;B7 6;B2 9;A4 14 7 52 9;B2 10;B6 9 10 4;C3 25;D13 4 21 24 26;B4 4 12 26;B3 4 13 27;A1 4 22 29;B7 12;B2 14;A4 14 6 52 14;B2 15;B6 14 15 4;B3 0 0 30;C3 29;A1 4 23 27;B7 13;C3 30;D13 24 24 32 31;D13 25 37 32 33;A1 23 18 28;B2 16;A2 16 25 33;B7 16;B3 0 0 34;B2 21;A6 47 21&&C0;B1&&{ D13 21 0 32 19;D13 10 42 32 40;D22 29 35 46 39;};D23 14 1 48 42;D12 34 43 53 44;D22 0 $((N1+8)) 51 32;D13 4 8 41 6;D12 26 28 35 34;D13 27 29 36 35;A2 27 32 39&&{ B2 19;A2 33 33 40;B2 20;B6 19 20 3;};C2 36;D23 33 34 42 37;B1&&D23 35 45 55 46;D23 32 31 43 38;D12 36 47 32 48;D13 20 42 32 41;D13 14 2 48 43;D13 4 5 32 1;D22 4 4 50 0;D13 14 3 49 5;D12 26 48 59 49;B3 4 22 57;A1 26 46 56;B7 22;B3 0 0 58;C3 47;D23 22 9 37 7;A7;C2 2;} 2>/dev/null|pbcopy;exit 2>&-
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Severe memory leaks on certain sites
Followed FAQ advice and installed Leak Monitor add-on. Occasional leaks occur while surfing. On one site (Chase Bank online banking) leaks occur so often I can't keep up with closing the Leak Monitor alert windows. Why does this occur on particular sites? Is it a problem with the site or with Firefox (3.5.9)? What can be done about it? Thanks.
== URL of affected sites ==
https://chaseonline.chase.com/secure/LogOff.aspxI gave address of Chase logoff page. Problem pages are:
https://chaseonline.chase.com/MyAccounts.aspx
https://banking.chase.com/AccountActivity/AccountDetails.aspx?AI=206979602
https://banking.chase.com/AccountActivity/SelectDownloadMethod.aspx?AI=206979602
These pages may be proprietary to my Chase accounts. -
Hi,
we're load testing an application using Coherence. It uses a distributed cache, with an web application as the client, and separate cache servers implementing a Cache Store.
We're getting several memory leaks and one area that was reported was a great number of instances for the com.tangosol.coherence.component.util.daemon.queueProcessor.service.DistributedCache$GetRequest class.
Does anybody know what could cause these instances to be left hanging around? I think the Coherence classes ar a symptom of another problem rather than an issue with Coherence itself but it would be useful to know what could cause these objects to be left in the heap.
Thanks
MikeAfter further load testing, our application definitely seems to be leaking Coherence objects.
The classes seem to be com.tangosol.util.Binary &
com.tangosol.coherence.component.util.daemon.queueProcessor.service.DistributedCache$GetRequest.
During testing, the number of Binary objects rose 0 to about 9000 and the number of GetRequest objects rose from 0 to about 3600 in two hours.
The application stores objects in the cache and updates them, the main operation being to add to a very long log string required by the client to these objects, which represent sessions.
Our test keeps a constant number of these objects in the cache during the run, removing the same number it creates after it has ramped up to full load testing.
The application is stateless, it recieves frequent requests to get an object from the cache, work on it and put it back in the cache. The cache also has a cache store to persist the data to a database.
Are there any references to the cache objects that would stop them being garbage collected?
Our whole application is based in a simple stateless reqest/response operation and I cannot see where the huge number of objects is coming from.
Mike -
Observed Memory Leak When Invoking Controls in Workshop 8.1 sp3
Hello,
We have developed a website using Bea Portal 8.1 sp3. In testing we have observed severe memory leaking problems which occur also in the production environment where WebLogic is not being run in debug mode. The troubleshooting was started by profiling the testing environment (running in debug mode) using JProfiler. The leak was isolated to occur especially in control method invocation via InvocationHandler call. The object being leaked was character array. After further study we noticed that the method call which this framework InvocationHandler was delegating had especially large return value. Namely a map consisting of ~5Mb of content. After reviewing our own code for possible leak source and coming up with nothing obviously wrong we started to suspect that something was leaking memory in the WebLogic framework code. As the leaked object was character array we suspected that the framework was calling toString() method of the return value and the string was never released. To prove this we constructed a small test program which just demonstrated passing large object as arguments and return values in invocations to WebLogic Workshop control from page flow. The memory consumption in WebLogic monitor and console output proved that indeed the toString() method was invoked 1 times in invocation per argument and 2 times per return value. Furthermore by returning empty string in one test and string of several megabytes in other from toString() one could observe exactly matching memory leaking. Manual running of the garbage collector did not release the memory.
To resolve this problem we have tried to alter the Workshop logging configuration in WorkshopLogCfg.xml. Lowering the log level to debug in categories caused much more invocations to the toString() of the arguments. We did not monitor the memory leaking in this test. Raising all the category levels to fatal did not have effect compared to the original settings. Also removing all categories did not have effect on toString() calls.
We have established quite reliably that this leak occurs with our configuration both in development environment (Windows XP) and testing environment (Redhat Linux) both running WebLogic in debug mode. Both of these environments have out of the box log configuration. We have also observed memory leaking in production environment but it has not yet been profiled to see whether the leak is 100% surely due to this same problem.
We have not yet tested this in sp5 nor sp6. Switching service packs is not solution for as in the moment as we are not able to switch the service pack in production environment due to reasons which are out of our control.
We would appreciate confirmation whether this issue is real and any solutions available like configuration modification, patching or switching service pack. Also links to existing articles about this issue would be nice to have.
We can provide the testing code and some screenshots of memory usage via email. You can request it from tommi.laukkanen at xiiris.com.
best regards,
Tommi Laukkanen / WM-data Finland / Digital Media (tommi.laukkanen at wmdata.fi or tommi.laukkanen at xiiris.com)
Artti Jaakkola / WM-data Finland / Digital Media (artti.jaakkola at wmdata.fi)
PS. This is the console out from the test page flow invoking the control:
We have manually thrown and catched exceptions in toString() method to get the stack trace printed to console out.
java.lang.Exception
at Test.ControlTest.TestControlImpl$TestContainer.toString(TestControlImpl.jcs:43)
at com.bea.wlw.runtime.core.context.WlwThreadContext.logReturn(WlwThreadContext.java:430) <---------------------
at com.bea.wlw.runtime.core.context.WlwThreadContext.endInvocation(WlwThreadContext.java:637)
at com.bea.wlw.runtime.core.container.Invocable.invoke(Invocable.java:445)
at com.bea.wlw.runtime.core.container.Invocable.invoke(Invocable.java:396)
at com.bea.wlw.runtime.core.container.Invocable.invoke(Invocable.java:248)
at com.bea.wlw.runtime.jcs.container.JcsContainer.invoke(JcsContainer.java:84)
at com.bea.wlw.runtime.core.bean.BaseContainerBean.invokeBase(BaseContainerBean.java:198)
at com.bea.wlw.runtime.core.bean.SLSBContainerBean.invoke(SLSBContainerBean.java:103)
at com.bea.wlwgen.StatelessContainer_ly05hg_ELOImpl.invoke(StatelessContainer_ly05hg_ELOImpl.java:99)
at com.bea.wlwgen.GenericStatelessSLSBContAdpt.invokeOnBean(GenericStatelessSLSBContAdpt.java:62)
at com.bea.wlw.runtime.core.bean.BaseDispatcherBean.runAsInvoke(BaseDispatcherBean.java:153)
at com.bea.wlw.runtime.core.bean.BaseDispatcherBean.invoke(BaseDispatcherBean.java:54)
at com.bea.wlw.runtime.core.bean.SyncDispatcherBean.invoke(SyncDispatcherBean.java:160)
at com.bea.wlw.runtime.core.bean.SyncDispatcher_k1mrl8_EOImpl.invoke(SyncDispatcher_k1mrl8_EOImpl.java:100)
at com.bea.wlw.runtime.core.dispatcher.Dispatcher.remoteDispatch(Dispatcher.java:161)
at com.bea.wlw.runtime.core.dispatcher.ServiceHandleImpl.invoke(ServiceHandleImpl.java:436)
at com.bea.wlw.runtime.core.dispatcher.WlwProxyImpl._invoke(WlwProxyImpl.java:326)
at com.bea.wlw.runtime.core.dispatcher.WlwProxyImpl.invoke(WlwProxyImpl.java:315)
at $Proxy19.testMethod(Unknown Source)
at Test.ControlTest.ControlTestController.begin(ControlTestController.jpf:58)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.bea.wlw.netui.pageflow.FlowController.invokeActionMethod(FlowController.java:1507)
at com.bea.wlw.netui.pageflow.FlowController.getActionMethodForward(FlowController.java:1433)
at com.bea.wlw.netui.pageflow.FlowController.internalExecute(FlowController.java:764)
at com.bea.wlw.netui.pageflow.PageFlowController.internalExecute(PageFlowController.java:211)
at com.bea.wlw.netui.pageflow.FlowController.execute(FlowController.java:594)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.process(PageFlowRequestProcessor.java:650)
at com.bea.wlw.netui.pageflow.AutoRegisterActionServlet.process(AutoRegisterActionServlet.java:527)
at com.bea.wlw.netui.pageflow.PageFlowActionServlet.process(PageFlowActionServlet.java:152)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at com.bea.p13n.servlets.PortalServletFilter.doFilter(PortalServletFilter.java:351)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:316)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.superForward(PageFlowRequestProcessor.java:1301)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor$DefaultHttpRedirector.forward(PageFlowRequestProcessor.ja
va:1317)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.doForward(PageFlowRequestProcessor.java:1199)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.process(PageFlowRequestProcessor.java:637)
at com.bea.wlw.netui.pageflow.AutoRegisterActionServlet.process(AutoRegisterActionServlet.java:527)
at com.bea.wlw.netui.pageflow.PageFlowActionServlet.process(PageFlowActionServlet.java:152)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at com.bea.p13n.servlets.PortalServletFilter.doFilter(PortalServletFilter.java:351)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6458)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3661)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2630)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
java.lang.Exception
at Test.ControlTest.TestControlImpl$TestContainer.toString(TestControlImpl.jcs:43)
at com.bea.wlw.runtime.core.request.ExecResponse.toString(ExecResponse.java:53)
at com.bea.wlw.runtime.core.bean.SyncDispatcherBean.invoke(SyncDispatcherBean.java:269) <---------------------
at com.bea.wlw.runtime.core.bean.SyncDispatcher_k1mrl8_EOImpl.invoke(SyncDispatcher_k1mrl8_EOImpl.java:100)
at com.bea.wlw.runtime.core.dispatcher.Dispatcher.remoteDispatch(Dispatcher.java:161)
at com.bea.wlw.runtime.core.dispatcher.ServiceHandleImpl.invoke(ServiceHandleImpl.java:436)
at com.bea.wlw.runtime.core.dispatcher.WlwProxyImpl._invoke(WlwProxyImpl.java:326)
at com.bea.wlw.runtime.core.dispatcher.WlwProxyImpl.invoke(WlwProxyImpl.java:315)
at $Proxy19.testMethod(Unknown Source)
at Test.ControlTest.ControlTestController.begin(ControlTestController.jpf:58)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.bea.wlw.netui.pageflow.FlowController.invokeActionMethod(FlowController.java:1507)
at com.bea.wlw.netui.pageflow.FlowController.getActionMethodForward(FlowController.java:1433)
at com.bea.wlw.netui.pageflow.FlowController.internalExecute(FlowController.java:764)
at com.bea.wlw.netui.pageflow.PageFlowController.internalExecute(PageFlowController.java:211)
at com.bea.wlw.netui.pageflow.FlowController.execute(FlowController.java:594)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.process(PageFlowRequestProcessor.java:650)
at com.bea.wlw.netui.pageflow.AutoRegisterActionServlet.process(AutoRegisterActionServlet.java:527)
at com.bea.wlw.netui.pageflow.PageFlowActionServlet.process(PageFlowActionServlet.java:152)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at com.bea.p13n.servlets.PortalServletFilter.doFilter(PortalServletFilter.java:351)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:316)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.superForward(PageFlowRequestProcessor.java:1301)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor$DefaultHttpRedirector.forward(PageFlowRequestProcessor.ja
va:1317)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.doForward(PageFlowRequestProcessor.java:1199)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.process(PageFlowRequestProcessor.java:637)
at com.bea.wlw.netui.pageflow.AutoRegisterActionServlet.process(AutoRegisterActionServlet.java:527)
at com.bea.wlw.netui.pageflow.PageFlowActionServlet.process(PageFlowActionServlet.java:152)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at com.bea.p13n.servlets.PortalServletFilter.doFilter(PortalServletFilter.java:351)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6458)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3661)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2630)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
java.lang.Exception
at Test.ControlTest.TestControlImpl$TestContainer.toString(TestControlImpl.jcs:43)
at java.lang.String.valueOf(String.java:2131)
at java.lang.StringBuffer.append(StringBuffer.java:370)
at com.bea.wlw.runtime.core.context.WlwThreadContext.logInvoke(WlwThreadContext.java:363) <---------------------
at com.bea.wlw.runtime.core.context.WlwThreadContext.startInvocation(WlwThreadContext.java:608)
at com.bea.wlw.runtime.core.container.Invocable.invoke(Invocable.java:414)
at com.bea.wlw.runtime.core.container.Invocable.invoke(Invocable.java:396)
at com.bea.wlw.runtime.core.container.Invocable.invoke(Invocable.java:248)
at com.bea.wlw.runtime.jcs.container.JcsContainer.invoke(JcsContainer.java:84)
at com.bea.wlw.runtime.core.bean.BaseContainerBean.invokeBase(BaseContainerBean.java:198)
at com.bea.wlw.runtime.core.bean.SLSBContainerBean.invoke(SLSBContainerBean.java:103)
at com.bea.wlwgen.StatelessContainer_ly05hg_ELOImpl.invoke(StatelessContainer_ly05hg_ELOImpl.java:99)
at com.bea.wlwgen.GenericStatelessSLSBContAdpt.invokeOnBean(GenericStatelessSLSBContAdpt.java:62)
at com.bea.wlw.runtime.core.bean.BaseDispatcherBean.runAsInvoke(BaseDispatcherBean.java:153)
at com.bea.wlw.runtime.core.bean.BaseDispatcherBean.invoke(BaseDispatcherBean.java:54)
at com.bea.wlw.runtime.core.bean.SyncDispatcherBean.invoke(SyncDispatcherBean.java:160)
at com.bea.wlw.runtime.core.bean.SyncDispatcher_k1mrl8_EOImpl.invoke(SyncDispatcher_k1mrl8_EOImpl.java:100)
at com.bea.wlw.runtime.core.dispatcher.Dispatcher.remoteDispatch(Dispatcher.java:161)
at com.bea.wlw.runtime.core.dispatcher.ServiceHandleImpl.invoke(ServiceHandleImpl.java:436)
at com.bea.wlw.runtime.core.dispatcher.WlwProxyImpl._invoke(WlwProxyImpl.java:326)
at com.bea.wlw.runtime.core.dispatcher.WlwProxyImpl.invoke(WlwProxyImpl.java:315)
at $Proxy19.testMethod2(Unknown Source)
at Test.ControlTest.ControlTestController.begin(ControlTestController.jpf:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.bea.wlw.netui.pageflow.FlowController.invokeActionMethod(FlowController.java:1507)
at com.bea.wlw.netui.pageflow.FlowController.getActionMethodForward(FlowController.java:1433)
at com.bea.wlw.netui.pageflow.FlowController.internalExecute(FlowController.java:764)
at com.bea.wlw.netui.pageflow.PageFlowController.internalExecute(PageFlowController.java:211)
at com.bea.wlw.netui.pageflow.FlowController.execute(FlowController.java:594)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.process(PageFlowRequestProcessor.java:650)
at com.bea.wlw.netui.pageflow.AutoRegisterActionServlet.process(AutoRegisterActionServlet.java:527)
at com.bea.wlw.netui.pageflow.PageFlowActionServlet.process(PageFlowActionServlet.java:152)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at com.bea.p13n.servlets.PortalServletFilter.doFilter(PortalServletFilter.java:351)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:316)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.superForward(PageFlowRequestProcessor.java:1301)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor$DefaultHttpRedirector.forward(PageFlowRequestProcessor.ja
va:1317)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.doForward(PageFlowRequestProcessor.java:1199)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.process(PageFlowRequestProcessor.java:637)
at com.bea.wlw.netui.pageflow.AutoRegisterActionServlet.process(AutoRegisterActionServlet.java:527)
at com.bea.wlw.netui.pageflow.PageFlowActionServlet.process(PageFlowActionServlet.java:152)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at com.bea.p13n.servlets.PortalServletFilter.doFilter(PortalServletFilter.java:351)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6458)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3661)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2630)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
Message was edited by:
tlaukkan
Message was edited by:
tlaukkan
Message was edited by:
tlaukkanHi
I did not find any known issues on this. But since you can replicate the issue, could you please contact BEA Support and open a case and have this followed?
Since we may have to do some testing/profiling etc with different service packs with your sample, it would be better to follow up via a support case.
Thanks
Vimala -
Pro*c multithreaded application has memory leak
Hi there,
I posted this message a week ago in OCI section, nobody answer me.
I am really curious if my application has a bug or the pro*c has a bug.
Anyone can compile the sample code and test it easily.
I made multithreaded application which queries dynamic SQL, it works.
But the memory leaks when i query the SQL statement.
The more memory leaks, the more i query the SQL statement, even same SQL
statement.
I check it with top, shell command.
My machine is SUN E450, Solaris 8. Oracle 9.2.0.1
Compiler : gcc (GCC) 3.2.2
I changed source code which is from
$(ORACLE_HOME)/precomp/demo/proc/sample10.pc
the sample10 doesn't need to be multithreaded. But i think it has to work
correctly if i changed it to multithreaded application.
the make file and source code will be placed below.
I have to figure out the problem.
Please help
Thanks in advance,
the make file is below
HOME = /user/jkku
ORA = $(ORACLE_HOME)
CC = gcc
PROC = proc
LC_INCL = -I$(HOME)/work/dbmss/libs/include
lc_incl = include=$(HOME)/work/dbmss/libs/include
SYS_INCL =
sys_incl =
ORA_INCL = -I. \
-I$(ORA)/precomp/public \
-I$(ORA)/rdbms/public \
-I$(ORA)/rdbms/demo \
-I$(ORA)/rdbms/pbsql/public \
-I$(ORA)/network/public \
-DSLMXMX_ENABLE -DSLTS_ENABLE -D_SVID_GETTOD
INCLUDES = $(LC_INCL) $(SYS_INCL) $(ORA_INCL)
includes = $(lc_incl) $(sys_incl)
LC_LIBS =
SYS_LIBS = -lpthread -lsocket -lnsl -lrt
ORA_LIBS = -L$(ORA)/lib/ -lclntsh
LIBS = $(LC_LIBS) $(SYS_LIBS) $(ORA_LIBS)
# Define C Compiler flags
CFLAGS += -D_Solaris64_ -m64
CFLAGS += -g -D_REENTRANT
# Define pro*c Compiler flags
PROCFLAGS += THREADS=YES
PROCFLAGS += CPOOL=YES
# Our object files
PRECOMPS = sample10.c
OBJS = sample10.o
.SUFFIXES: .o .c .pc
.c.o:
$(CC) -c $(CFLAGS) $(INCLUDES) $*.c
.pc.c:
$(PROC) $(PROCFLAGS) $(includes) $*.pc $*.c
all: sample10
sample10: $(PRECOMPS) $(OBJS)
$(CC) $(CFLAGS) -o sample10 $(OBJS) $(LIBS)
clean:
rm -rf *.o sample10 sample10.c
the source code is below which i changed the oracle sample10.pc to
multithreaded application.
Sample Program 10: Dynamic SQL Method 4
This program connects you to ORACLE using your username and
password, then prompts you for a SQL statement. You can enter
any legal SQL statement. Use regular SQL syntax, not embedded SQL.
Your statement will be processed. If it is a query, the rows
fetched are displayed.
You can enter multi-line statements. The limit is 1023 characters.
This sample program only processes up to MAX_ITEMS bind variables and
MAX_ITEMS select-list items. MAX_ITEMS is #defined to be 40.
#include <stdio.h>
#include <string.h>
#include <setjmp.h>
#include <sqlda.h>
#include <stdlib.h>
#include <sqlcpr.h>
/* Maximum number of select-list items or bind variables. */
#define MAX_ITEMS 40
/* Maximum lengths of the names of the
select-list items or indicator variables. */
#define MAX_VNAME_LEN 30
#define MAX_INAME_LEN 30
#ifndef NULL
#define NULL 0
#endif
/* Prototypes */
#if defined(__STDC__)
void sql_error(void);
int oracle_connect(void);
int alloc_descriptors(int, int, int);
int get_dyn_statement(void);
void set_bind_variables(void);
void process_select_list(void);
void help(void);
#else
void sql_error(/*_ void _*/);
int oracle_connect(/*_ void _*/);
int alloc_descriptors(/*_ int, int, int _*/);
int get_dyn_statement(/* void _*/);
void set_bind_variables(/*_ void -*/);
void process_select_list(/*_ void _*/);
void help(/*_ void _*/);
#endif
char *dml_commands[] = {"SELECT", "select", "INSERT", "insert",
"UPDATE", "update", "DELETE", "delete"};
EXEC SQL INCLUDE sqlda;
EXEC SQL INCLUDE sqlca;
EXEC SQL BEGIN DECLARE SECTION;
char dyn_statement[1024];
EXEC SQL VAR dyn_statement IS STRING(1024);
EXEC SQL END DECLARE SECTION;
EXEC ORACLE OPTION (ORACA=YES);
EXEC ORACLE OPTION (RELEASE_CURSOR=YES);
SQLDA *bind_dp;
SQLDA *select_dp;
/* Define a buffer to hold longjmp state info. */
jmp_buf jmp_continue;
char *db_uid="dbmuser/dbmuser@dbmdb";
sql_context ctx;
int err_sql;
enum{
SQL_SUCC=0,
SQL_ERR,
SQL_NOTFOUND,
SQL_UNIQUE,
SQL_DISCONNECT,
SQL_NOTNULL
int main()
int i;
EXEC SQL ENABLE THREADS;
EXEC SQL WHENEVER SQLERROR DO sql_error();
EXEC SQL WHENEVER NOT FOUND DO sql_not_found();
/* Connect to the database. */
if (connect_database() < 0)
exit(1);
EXEC SQL CONTEXT USE :ctx;
/* Process SQL statements. */
for (;;)
/* Allocate memory for the select and bind descriptors. */
if (alloc_descriptors(MAX_ITEMS, MAX_VNAME_LEN, NAME_LEN) != 0)
exit(1);
(void) setjmp(jmp_continue);
/* Get the statement. Break on "exit". */
if (get_dyn_statement() != 0)
break;
EXEC SQL PREPARE S FROM :dyn_statement;
EXEC SQL DECLARE C CURSOR FOR S;
/* Set the bind variables for any placeholders in the
SQL statement. */
set_bind_variables();
/* Open the cursor and execute the statement.
* If the statement is not a query (SELECT), the
* statement processing is completed after the
* OPEN.
EXEC SQL OPEN C USING DESCRIPTOR bind_dp;
/* Call the function that processes the select-list.
* If the statement is not a query, this function
* just returns, doing nothing.
process_select_list();
/* Tell user how many rows processed. */
for (i = 0; i < 8; i++)
if (strncmp(dyn_statement, dml_commands, 6) == 0)
printf("\n\n%d row%c processed.\n", sqlca.sqlerrd[2], sqlca.sqlerrd[2] == 1 ? '\0' : 's');
break;
/* Close the cursor. */
EXEC SQL CLOSE C;
/* When done, free the memory allocated for pointers in the bind and
select descriptors. */
for (i = 0; i < MAX_ITEMS; i++)
if (bind_dp->V != (char *) 0)
free(bind_dp->V);
free(bind_dp->I); /* MAX_ITEMS were allocated. */
if (select_dp->V != (char *) 0)
free(select_dp->V);
free(select_dp->I); /* MAX_ITEMS were allocated. */
/* Free space used by the descriptors themselves. */
SQLSQLDAFree(ctx, bind_dp);
SQLSQLDAFree(ctx, select_dp);
} /* end of for(;;) statement-processing loop */
disconnect_database();
EXEC SQL WHENEVER SQLERROR CONTINUE;
EXEC SQL COMMIT WORK RELEASE;
puts("\nHave a good day!\n");
return;
* Allocate the BIND and SELECT descriptors using sqlald().
* Also allocate the pointers to indicator variables
* in each descriptor. The pointers to the actual bind
* variables and the select-list items are realloc'ed in
* the set_bind_variables() or process_select_list()
* routines. This routine allocates 1 byte for select_dp->V
* and bind_dp->V, so the realloc will work correctly.
alloc_descriptors(size, max_vname_len, max_iname_len)
int size;
int max_vname_len;
int max_iname_len;
int i;
* The first sqlald parameter determines the maximum number of
* array elements in each variable in the descriptor. In
* other words, it determines the maximum number of bind
* variables or select-list items in the SQL statement.
* The second parameter determines the maximum length of
* strings used to hold the names of select-list items
* or placeholders. The maximum length of column
* names in ORACLE is 30, but you can allocate more or less
* as needed.
* The third parameter determines the maximum length of
* strings used to hold the names of any indicator
* variables. To follow ORACLE standards, the maximum
* length of these should be 30. But, you can allocate
* more or less as needed.
if ((bind_dp =
SQLSQLDAAlloc(ctx, size, max_vname_len, max_iname_len)) ==
(SQLDA *) 0)
fprintf(stderr,
"Cannot allocate memory for bind descriptor.");
return -1; /* Have to exit in this case. */
if ((select_dp =
SQLSQLDAAlloc(ctx, size, max_vname_len, max_iname_len)) == (SQLDA *)
0)
fprintf(stderr,
"Cannot allocate memory for select descriptor.");
return -1;
select_dp->N = MAX_ITEMS;
/* Allocate the pointers to the indicator variables, and the
actual data. */
for (i = 0; i < MAX_ITEMS; i++) {
bind_dp->I = (short *) malloc(sizeof (short));
select_dp->I = (short *) malloc(sizeof(short));
bind_dp->V = (char *) malloc(1);
select_dp->V = (char *) malloc(1);
return 0;
int get_dyn_statement()
char *cp, linebuf[256];
int iter, plsql;
for (plsql = 0, iter = 1; ;)
if (iter == 1)
printf("\nSQL> ");
dyn_statement[0] = '\0';
fgets(linebuf, sizeof linebuf, stdin);
cp = strrchr(linebuf, '\n');
if (cp && cp != linebuf)
*cp = ' ';
else if (cp == linebuf)
continue;
if ((strncmp(linebuf, "EXIT", 4) == 0) ||
(strncmp(linebuf, "exit", 4) == 0))
return -1;
else if (linebuf[0] == '?' ||
(strncmp(linebuf, "HELP", 4) == 0) ||
(strncmp(linebuf, "help", 4) == 0))
help();
iter = 1;
continue;
if (strstr(linebuf, "BEGIN") ||
(strstr(linebuf, "begin")))
plsql = 1;
strcat(dyn_statement, linebuf);
if ((plsql && (cp = strrchr(dyn_statement, '/'))) ||
(!plsql && (cp = strrchr(dyn_statement, ';'))))
*cp = '\0';
break;
else
iter++;
printf("%3d ", iter);
return 0;
void set_bind_variables()
int i, n;
char bind_var[64];
/* Describe any bind variables (input host variables) */
EXEC SQL WHENEVER SQLERROR DO sql_error();
bind_dp->N = MAX_ITEMS; /* Initialize count of array elements. */
EXEC SQL DESCRIBE BIND VARIABLES FOR S INTO bind_dp;
/* If F is negative, there were more bind variables
than originally allocated by sqlald(). */
if (bind_dp->F < 0)
printf ("\nToo many bind variables (%d), maximum is %d\n.",
-bind_dp->F, MAX_ITEMS);
return;
/* Set the maximum number of array elements in the
descriptor to the number found. */
bind_dp->N = bind_dp->F;
/* Get the value of each bind variable as a
* character string.
* C contains the length of the bind variable
* name used in the SQL statement.
* S contains the actual name of the bind variable
* used in the SQL statement.
* L will contain the length of the data value
* entered.
* V will contain the address of the data value
* entered.
* T is always set to 1 because in this sample program
* data values for all bind variables are entered
* as character strings.
* ORACLE converts to the table value from CHAR.
* I will point to the indicator value, which is
* set to -1 when the bind variable value is "null".
for (i = 0; i < bind_dp->F; i++)
printf ("\nEnter value for bind variable %.*s: ",
(int)bind_dp->C, bind_dp->S);
fgets(bind_var, sizeof bind_var, stdin);
/* Get length and remove the new line character. */
n = strlen(bind_var) - 1;
/* Set it in the descriptor. */
bind_dp->L = n;
/* (re-)allocate the buffer for the value.
sqlald() reserves a pointer location for
V but does not allocate the full space for
the pointer. */
bind_dp->V = (char *) realloc(bind_dp->V, (bind_dp->L + 1));
/* And copy it in. */
strncpy(bind_dp->V, bind_var, n);
/* Set the indicator variable's value. */
if ((strncmp(bind_dp->V, "NULL", 4) == 0) ||
(strncmp(bind_dp->V, "null", 4) == 0))
*bind_dp->I = -1;
else
*bind_dp->I = 0;
/* Set the bind datatype to 1 for CHAR. */
bind_dp->T = 1;
return;
void process_select_list()
int i, null_ok, precision, scale;
if ((strncmp(dyn_statement, "SELECT", 6) != 0) &&
(strncmp(dyn_statement, "select", 6) != 0))
select_dp->F = 0;
return;
/* If the SQL statement is a SELECT, describe the
select-list items. The DESCRIBE function returns
their names, datatypes, lengths (including precision
and scale), and NULL/NOT NULL statuses. */
select_dp->N = MAX_ITEMS;
EXEC SQL DESCRIBE SELECT LIST FOR S INTO select_dp;
/* If F is negative, there were more select-list
items than originally allocated by sqlald(). */
if (select_dp->F < 0)
printf ("\nToo many select-list items (%d), maximum is %d\n",
-(select_dp->F), MAX_ITEMS);
return;
/* Set the maximum number of array elements in the
descriptor to the number found. */
select_dp->N = select_dp->F;
/* Allocate storage for each select-list item.
sqlprc() is used to extract precision and scale
from the length (select_dp->L).
sqlnul() is used to reset the high-order bit of
the datatype and to check whether the column
is NOT NULL.
CHAR datatypes have length, but zero precision and
scale. The length is defined at CREATE time.
NUMBER datatypes have precision and scale only if
defined at CREATE time. If the column
definition was just NUMBER, the precision
and scale are zero, and you must allocate
the required maximum length.
DATE datatypes return a length of 7 if the default
format is used. This should be increased to
9 to store the actual date character string.
If you use the TO_CHAR function, the maximum
length could be 75, but will probably be less
(you can see the effects of this in SQL*Plus).
ROWID datatype always returns a fixed length of 18 if
coerced to CHAR.
LONG and
LONG RAW datatypes return a length of 0 (zero),
so you need to set a maximum. In this example,
it is 240 characters.
printf ("\n");
for (i = 0; i < select_dp->F; i++)
char title[MAX_VNAME_LEN];
/* Turn off high-order bit of datatype (in this example,
it does not matter if the column is NOT NULL). */
sqlnul ((unsigned short *)&(select_dp->T), (unsigned short
*)&(select_dp->T), &null_ok);
switch (select_dp->T)
case 1 : /* CHAR datatype: no change in length
needed, except possibly for TO_CHAR
conversions (not handled here). */
break;
case 2 : /* NUMBER datatype: use sqlprc() to
extract precision and scale. */
sqlprc ((unsigned int *)&(select_dp->L), &precision,
&scale);
/* Allow for maximum size of NUMBER. */
if (precision == 0) precision = 40;
/* Also allow for decimal point and
possible sign. */
/* convert NUMBER datatype to FLOAT if scale > 0,
INT otherwise. */
if (scale > 0)
select_dp->L = sizeof(float);
else
select_dp->L = sizeof(int);
break;
case 8 : /* LONG datatype */
select_dp->L = 240;
break;
case 11 : /* ROWID datatype */
case 104 : /* Universal ROWID datatype */
select_dp->L = 18;
break;
case 12 : /* DATE datatype */
select_dp->L = 9;
break;
case 23 : /* RAW datatype */
break;
case 24 : /* LONG RAW datatype */
select_dp->L = 240;
break;
/* Allocate space for the select-list data values.
sqlald() reserves a pointer location for
V but does not allocate the full space for
the pointer. */
if (select_dp->T != 2)
select_dp->V = (char *) realloc(select_dp->V,
select_dp->L + 1);
else
select_dp->V = (char *) realloc(select_dp->V,
select_dp->L);
/* Print column headings, right-justifying number
column headings. */
/* Copy to temporary buffer in case name is null-terminated */
memset(title, ' ', MAX_VNAME_LEN);
strncpy(title, select_dp->S, select_dp->C);
if (select_dp->T == 2)
if (scale > 0)
printf ("%.*s ", select_dp->L+3, title);
else
printf ("%.*s ", select_dp->L, title);
else
printf("%-.*s ", select_dp->L, title);
/* Coerce ALL datatypes except for LONG RAW and NUMBER to
character. */
if (select_dp->T != 24 && select_dp->T != 2)
select_dp->T = 1;
/* Coerce the datatypes of NUMBERs to float or int depending on
the scale. */
if (select_dp->T == 2)
if (scale > 0)
select_dp->T = 4; /* float */
else
select_dp->T = 3; /* int */
printf ("\n\n");
/* FETCH each row selected and print the column values. */
EXEC SQL WHENEVER NOT FOUND GOTO end_select_loop;
for (;;)
EXEC SQL FETCH C USING DESCRIPTOR select_dp;
/* Since each variable returned has been coerced to a
character string, int, or float very little processing
is required here. This routine just prints out the
values on the terminal. */
for (i = 0; i < select_dp->F; i++)
if (*select_dp->I < 0)
if (select_dp->T == 4)
printf ("%-*c ",(int)select_dp->L+3, ' ');
else
printf ("%-*c ",(int)select_dp->L, ' ');
else
if (select_dp->T == 3) /* int datatype */
printf ("%*d ", (int)select_dp->L,
*(int *)select_dp->V);
else if (select_dp->T == 4) /* float datatype */
printf ("%*.2f ", (int)select_dp->L,
*(float *)select_dp->V);
else /* character string */
printf ("%-*.*s ", (int)select_dp->L,
(int)select_dp->L, select_dp->V);
printf ("\n");
end_select_loop:
return;
void help()
puts("\n\nEnter a SQL statement or a PL/SQL block at the SQL> prompt.");
puts("Statements can be continued over several lines, except");
puts("within string literals.");
puts("Terminate a SQL statement with a semicolon.");
puts("Terminate a PL/SQL block (which can contain embedded
semicolons)");
puts("with a slash (/).");
puts("Typing \"exit\" (no semicolon needed) exits the program.");
puts("You typed \"?\" or \"help\" to get this message.\n\n");
int connect_database()
err_sql = SQL_SUCC;
EXEC SQL WHENEVER SQLERROR DO sql_error();
EXEC SQL WHENEVER NOT FOUND DO sql_not_found();
EXEC SQL CONTEXT ALLOCATE :ctx;
EXEC SQL CONTEXT USE :ctx;
EXEC SQL CONNECT :db_uid;
if(err_sql != SQL_SUCC){
printf("err => connect database(ctx:%ld, uid:%s) failed!\n", ctx, db_uid);
return -1;
return 1;
int disconnect_database()
err_sql = SQL_SUCC;
EXEC SQL WHENEVER SQLERROR DO sql_error();
EXEC SQL WHENEVER NOT FOUND DO sql_not_found();
EXEC SQL CONTEXT USE :ctx;
EXEC SQL COMMIT WORK RELEASE;
EXEC SQL CONTEXT FREE:ctx;
return 1;
void sql_error()
printf("err => %.*s", sqlca.sqlerrm.sqlerrml, sqlca.sqlerrm.sqlerrmc);
printf("in \"%.*s...\'\n", oraca.orastxt.orastxtl, oraca.orastxt.orastxtc);
printf("on line %d of %.*s.\n\n", oraca.oraslnr, oraca.orasfnm.orasfnml,
oraca.orasfnm.orasfnmc);
switch(sqlca.sqlcode) {
case -1: /* unique constraint violated */
err_sql = SQL_UNIQUE;
break;
case -1012: /* not logged on */
case -1089:
case -3133:
case -1041:
case -3114:
case -3113:
/* �6�Ŭ�� shutdown�ǰų� �α��� ���°� �ƴҶ� ��b�� �õ� */
/* immediate shutdown in progress - no operations are permitted */
/* end-of-file on communication channel */
/* internal error. hostdef extension doesn't exist */
err_sql = SQL_DISCONNECT;
break;
case -1400:
err_sql = SQL_NOTNULL;
break;
default:
err_sql = SQL_ERR;
break;
EXEC SQL CONTEXT USE :ctx;
EXEC SQL WHENEVER SQLERROR CONTINUE;
EXEC SQL ROLLBACK WORK;
void sql_not_found()
err_sql = SQL_NOTFOUND;Hi Jane,
What version of Berkeley DB XML are you using?
What is your operating system and your hardware platform?
For how long have been the application running?
What is your current container size?
What's set for EnvironmentConfig.setThreaded?
Do you know if containers have previously not been closed correctly?
Can you please post the entire error output?
What's the JDK version, 1.4 or 1.5?
Thanks,
Bogdan -
Hi,
We busy upgrading our apex and db from 3.0/10G to 4.1.1/11.2G and notice that there appears to be a memory leak when using APEX. At one stage we have had IE7 using over a gig of memory.
When you load or refresh your page IE7 seems to grab on average 2-5MB of memory for each page load. At first we thought it may have been our apps or setup but this also happens when we go to app 4550 page 1 on apex.oracle.com.
How to replicate:
Open task manager to view the Memory Usage.
Using IE7
1. Go to http://apex.oracle.com/pls/apex/f?p=4550:1
2. Go back to Task Manager and note the readings once the CPU Usage for iexplore.exe has stablised to 0.
3. go back to IE7 and press F5
4. Repeat steps 2-3 and you will see the Memory usage increases.
We think this maybe due to a few jQuery UI memory leaks within IE7 and thought this bug ticket maybe of interest http://bugs.jqueryui.com/ticket/7666 (Slightly different versions but similiar experiences)
Could someone else confirm that they also experience the increasing or have had similiar problems and managed to resolve it?
TBH, it wouldn't be an issue to use another browser like Firefox to access the builder but this also affects the applications if they include APEX standard Javascript and CSS.
Thanking you in advance.
Alistair
Edited by: Alistair Laing on Jun 16, 2012 2:32 PM
Added TagsAlistair Laing wrote:
Hi,
We busy upgrading our apex and db from 3.0/10G to 4.1.1/11.2G and notice that there appears to be a memory leak when using APEX. At one stage we have had IE7 using over a gig of memory.
When you load or refresh your page IE7 seems to grab on average 2-5MB of memory for each page load. At first we thought it may have been our apps or setup but this also happens when we go to app 4550 page 1 on apex.oracle.com.
How to replicate:
Open task manager to view the Memory Usage.
Using IE7
1. Go to http://apex.oracle.com/pls/apex/f?p=4550:1
2. Go back to Task Manager and note the readings once the CPU Usage for iexplore.exe has stablised to 0.
3. go back to IE7 and press F5
4. Repeat steps 2-3 and you will see the Memory usage increases.
We think this maybe due to a few jQuery UI memory leaks within IE7 and thought this bug ticket maybe of interest http://bugs.jqueryui.com/ticket/7666 (Slightly different versions but similiar experiences)
Could someone else confirm that they also experience the increasing or have had similiar problems and managed to resolve it?Anecdotally, yes. Don't have exact steps for replication or precise numbers, but I have noticed this in passing. On the junk that my client considers a PC suitable for web development the typical IE7 memory footprint with the APEX 3.0 builder and several other tabs running is about 52MB. Add APEX 4.1.1 and it climbs constantly until I have to pull the plug when it gets north of 150MB as the PC can't take it.
As well that I also have Firefox and 4.1.1 is still experimental at that site...
At the moment I don't have to resolve it and if I did the only option I'd propose is the replacement of IE7.
VC wrote:
Look at this http://www.bbc.co.uk/news/technology-18440979
Alistair Laing wrote:lol @ VC - I dont shop online at work :-D
I saw that eariler this week. I do agree with the concept though.So take appropriate action: charge extra for IE7 support.
The amount of work and effort involved in making our website look normal on IE7 equalled the combined time of designing for Chrome, Safari and Firefox.Is entirely accurate. If it's stated as a requirement, itemise it as an extra on the quote.
Educate management and bean counters: show them the one line of standards-compliant CSS that's all that is necessary in Safari, Chrome, Firefox and Opera (and just possibly in IE8/9/10), how it isn't supported in IE7, and the tortuous hacks and workarounds that are required to get something equivalent working there. -
DataSocket memory leak problem (2VO0SF00) -- more info?
When upgrading to LabVIEW 8.5 recently, I noticed the following known issue in the readme file:
"ID: 2VO0SF00
DataSocket/OPC Leaks Memory using ActiveX VIs to perform open-write-close repeatedly
If you call the DataSocket Open, DataSocket Write, and DataSocket Close functions in succession repeatedly, LabVIEW leaks memory. Workaround — To correct this problem, call the DataSocket Open function once, use the DataSocket Write function to write multiple times, and then use the DataSocket Close function."
Looking back, I think this problem may have been present in previous LabVIEW releases as well, and might be giving rise to a problem that's been dogging me for quite some time (see my thread, "Error 66 with DataSockets", http://forums.ni.com/ni/board/message?board.id=170&thread.id=187206), in addition to general slow/glitchy behaviour when my VI's have been running continuously for a long time. But in order to determine whether or not this issue affects me, and how I should go about fixing it in the context of my own programs, I need a bit more information about the nature of the issue itself and the inner workings of the DataSocket VI's. Any help or insight the community can provide into this would be greatly appreciated!
Here are my questions:
It is my understanding from the "known issue" description above that the memory leak happens when you have a DS Open wired to a DS Write wired to a DS Close, all inside a loop (example 1), and that the suggested workaround would be to move the DS Open and DS Close functions out of the loop on opposite sides, wired to the DS Write which remains inside the loop (example 2). Is this correct?
Does this leak also happen when performing DS open-read-close's repeatedly (example 3)?
What happens when a DS Write (or DS Read) is called without a corresponding DS Open and DS Close (examples 4a and 4b)? Does it implicitly do a DS open before doing the write operation and a DS close afterwards? What I'm getting at is this: would having an isolated DS Write (or DS Read) inside a loop, not connected to any DS Open or DS Close functions at all, cause this same memory leak?
If one computer is running the DS server and a second computer is running the VI with the repeated open-write-close's, on which computer does the memory leak occur?
In my question #1 workaround (example 2), the DS Open and DS Close outside the loop are routed through a shift register and in to and out of the DS Write inside the loop. If the DS connection id goes into the DS Write "connection in" and then splits and goes around the DS Write and out to the DS Close, without coming out of the DS Write "connection out" (example 5), will the memory leak still be avoided? I.e. if the DS Write function doesn't have anything connected to its "connection out", will it try to do an implicit DS Close?
If the VI causing the memory leak is stopped, but LabVIEW stays running, will the leaked memory be reclaimed? What if the VI is closed? What if all of LabVIEW is closed?
FYI, in the examples above "x1a" is a statically-defined DataSocket on the DS server running on the computer Max, to which the computer running the example VI's has read/write access. My actual application has numerous VI's and hundreds of DataSocket items, many of which are written to / read from every 50-100 ms in the style of examples 4a and 4b.
Does anyone have any idea about this stuff?
Thanks in advance,
Patrick
Attachments:
examples_jpg1.zip 63 KB
examples_vi1.zip 40 KBHi Meghan,
Yes, some of the larger VIs in my application do write to / read from several hundred DataSockets, so it's not feasible to use shift registers for each one individually, and hence why I'm passing the references into an array, etc.
Your Alternate Solution 2 is more along the lines of something that would work for me. However, my actual code has a lot of nested loops, sequences and DataSocket items which are not all written to in the same frame, so this solution would still be difficult to implement: it would be cumbersome to unpack the entire 500-element reference id array and build a new one (maintaining the positions and values of the unaffected elements) every time I write to some small subset of the DataSockets.
I think I have a solution which solves the problem and is also scalable to the size of my application -- I've attached it as Example 7. Do you think this will avoid the memory leak? It's the same as your Alternate Solution 2, except that instead of building a new array out of the DS Write reference outs, each reference out replaces the appropriate element of the original array.
If I understand you correctly, in order to avoid implicit reference opens and closes, a DS Write needs to have both it's reference in and reference out wired to something. Thus, even though my Example 7 replaces an element of the array with an identical value, and therefore doesn't actually change the array (which would be a silly thing to do normally), the DS Writes have their reference outs wired to something, and eventually in a convoluted way to a DS Close, so it should avoid the memory leak.
Just out of curiosity (I don't think anything like this would apply to my application or any fixes I implement), when would the implicit reference close happen in the attached Example 8? The DS Write has its reference in and reference out both connected to temporally "adjacent" DS Writes via the shift register, so perhaps it wouldn't try to close the reference on each loop iteration? Or would it look into the future and see that there is no DS Close and decide to implicitly do that itself? Or maybe only the DS Write on the last loop iteration does this?
Thanks for bearing with me through this,
Patrick
Attachments:
example73.JPG 40 KB
example83.JPG 14 KB -
How to configure license file for Memory Leak tool and WL Server 9.2?
(I posted to general JRockit forum before realizing existence of this forum which is probably more applicable.)
Here's our problem:
Running latest version of WL 9.2 MP3 and JRockit Mission Control 3.0.1
Able to run Mission Control, and connect to the WL Server and to run View Console with no problems.
I can't get Memory Leak tool to run because it complains about needing a license file.
First I tried with off the shelf WL 9.2 MP3.
Get error:
A license for Memory Leak Detector could not be found on the JRockit at (1.5) weblogic.Server (192).
Error: Can not find component Memory Leak Detector for JRockit * in the license file. Please check http://www.jrockit.com/license for license updates.
So I downloaded license file from JRockit download site - wls92.zip. It contains several files, but no clear instructions on what to do with these files. I copied one of these files "LIC-WLSP92.txt" to my JRockit home as C:\bea\JROCKI~1\jre\license.bea
Tried again. Restarted WL server. Restarted JRockit Mission Control.
Get error: A license for Memory Leak Detector could not be found on the JRockit at (1.5) weblogic.Server (3052).
The license file does not exist at: C:\bea\JROCKI~1\jre\license.bea
Any advise on how to install license or who to contact for help?Installed Mission Control 3.0.3.
Got following message when I attempted to run Memory Leak:
A license for Memory Leak Detector could not be found on the JRockit at (1.5) weblogic.Server (192).
Error: Can not find component Memory Leak Detector for JRockit * in the license file.
Please check http://www.jrockit.com/license for license updates.
I believe that we're using the latest downloads of WebLogic 9.2.x and JRockit.
WebLogic is running using 9.2.3 and JRockit build R27.4.0-90_CR358515-94243-1.5.0_12-20080118-1154-windows-ia2
Contents of C:\bea\jrockit_150_12\jre\license.bea:
<?xml version="1.0" encoding="ISO-8859-1"?>
<bea-licenses>
<license-group format="1.0" product="JRockit" release="*">
</license-group>
</bea-licenses>
Could WebLogic be misconfigured?
Any diagnostics to help figure out the licensing?
Any other ideas? -
HTTPService + XML Load + Memory Leak
Hi all....
I have noticed a memory leak in my application. This leak was
not apparent when the application was completed some months back
which is what left me a little confused as all I have done since
was upgrade to Flex 3 and possibly updated / changed my Flash
player.
I think I have found the cause to this problem (below) but am
not 100% sure that it is the "actual" problem or any reasons to
back my thoughts up, so have listed what I have checked / tried
along the way (maybe I have missed something)....
My Discovery Process:
I started profiling my application but did not find anything
out of the ordinary. I did a code walk-through double checking I
had cleaned up after myself, removing and even nulling all items
etc but still to now success - the leak is still there.
I have profiled the app in the profiler for reasonably long
periods of time.
All the classes etc being used within the app are consistent
in size and instance amount and there is no sign of any apparent
leak.
I am using a HTTPService that is loading XML data which I am
refreshing every 5 seconds. On this 5 second data refresh some
class instances are incremented but are restored to the expected
amount after a GC has occurred. The GC seems to take longer, the
longer the app is running, therefore more and more instances are
being added to the app, but when the GC eventually runs it "seems"
to clear these instances to the expected amount.
After scratching my head for a while I decided to make a copy
of my application, rip everything out, and focus in my data load,
where I found a problem!
I have now just a HTTPService that loads an XML file every 5
seconds, and this is all I currently have in the app (as I ripped
the rest of the code out), e.g:
Code:
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
....... creationComplete="initApp()" >
<mx:HTTPService
id="httpServiceResults"
url="
http://myIP:myPort/myRoot/myXML.cfm"
resultFormat="e4x"
result="httpResultHandler(event)" />
<script....... >
private var timerPulse:Timer;
private function initApp():void
httpServiceResults.send();
timerPulse = new Timer(5000, 0);
private function httpResultHandler(event:ResultEvent):void
timerPulse.start();
timerPulse.addEventListener(TimerEvent.TIMER, timerRefresh);
public function timerRefresh(eventObj:TimerEvent):void
timerPulse.stop();
timerPulse.removeEventListener(TimerEvent.TIMER,
timerRefresh);
timerPulse.reset();
httpServiceResults.send();
</script>
</mx:Application>
This is pretty much the code I am currently using and it
leaks.
I ran and monitored this in both the profiler and the
activity / task manager, and after running the app for 1800 seconds
(30 min) in the profiler, the memory size grew from 50mg to 165mg
just sending the HTTPService.
I tried loading the service in multiple ways including in AS
rather than MXML creating new instances of it each time, resetting
it, nulling it etc... but nothing prevented this memory increase.
I then tried to load the XML using different methods such as
using the URLRequest and URLLoader which again caused a memory
leak.
What still confuses me is that this leak did not exist in the
previous version and not a great deal has changed since then apart
from upgrading to Flex 3 and possibly upgrading my Flash payer
(which I believe is a possible cause)
After looking into this issue a bit more deeply, I read a few
blogs / forums and other people are experiencing the same problems
- even with a lot bigger leaks in some cases all when reloading
large sets of XML data into Flex - however, I as of yet found no
solution to this leak - people with a similar problem believe it is
not due to a memory leak more a GC error, and others pointing
towards the Flash Player itself that is leaking - I don't really
know.
Findings so far during investigation of this issue:
* App leaks for both HTTPService and ULRRequest / URLLoader
methods
* App only leaks when calling a data loader
* The size of the leak seems to depend on the size of the
XML being loaded
* The size of the leak also seems to be affected by the
applications heaviness - the greater seems to enhance the leak
An interesting factor I have noticed is that if I copy the
XML from my "myXML.cfm" that I link to in my HTTPService and copy
the contents of the file into my own XML file stored within the
Flex project root itself: ""myXML.xml"" the leak disappears... like
it seems to link when loading the XML over a network, however as my
network knowledge is not great I am not sure what to make of this -
any ideas???
Could the connection to the XML document cause leaks??? is
there anything else that could cause this leak??? have I something
in my code sample that could cause this leak??? or could any of the
other things I have mentioed cause this leak???
Any help / ideas would be greatly appreciated.
Thanks,
Jon.I also observed heavy memory leak from using httpservice with
XML data. I am using Flex3 builder under Linux. My Flex application
polls httpservice every 10 seconds. The reply is a short XML
message less than 100 bytes. This simple polling will consume 30+
MB of memory every hour. I leave it idling for several hours and it
took 200 MB of memory. No sign of garbage collection at all. -
Memory Leak issue 1.5.4.59.40-no-jre jdk1.6.0_12 jre6
Me and 2 other develops have been using SQL developer since it was created but we are getting really frustrated with the memory leaks we are experencing.
We will start up sql developer and if we just leave it alone within a couple hours it will have taken up 650Megs of ram and be completely locked up. If we are working in sql developer the time can be even faster till it lockups up. We have been experencing the issue for very long time but seems to have gotten worse in the last to updates.
I have tried to search the web and form for information to the memory problem to no avail. We are running oracle 10g and windows XP with 2gigs of ram.
Can some one point me to some information or have any idea what is going on?
Edit--
I just realized that I was not using the latest version that I have downloaded. Trying sqldeveloper-1.5.4.59.40-no-jre will advise as to results.
Edited by: ObeTheDuck on Mar 17, 2009 8:47 AM
2nd Edit--
1.5.4.59.40-no-jre has the same issue. 2hrs and it has locked up and is no longer listed as a running app and can only be seen under the process thread in windows task manager with 50% CPU use on a dual-core cpu and 626megs ram being used. Have to kill and restart ... <sigh>
Edited by: ObeTheDuck on Mar 17, 2009 10:45 AMThanks for the info so far....
We really do like sql developer as a tool and has been execeding helpful and useful as our development tool.
I am proud to say we have been using it since the 2nd month is was available and have been encourged and happy with most of the improvements.
I am looking forward to trying the modeling tool soon.
If I can get back to having a stable work enviorment for a work day that will be fine for now. It's just been reduced down to 2hrs which is a bit much.
Anyway...
1. We don't have any in house extentions that we need. I am speaking of the one that come bundled with the tool. Or at least I thought that they came bundled.
Several are migration tools which we don't need. One is TenTime tool which I don't think we need.
Last is the versioning extention, this sounds like something we want to use, but stability is more important at the moment. So unchecked they have all been.
2. Sue you asked about a clean install. Is that simply an unpacking a new folder copy and then not migrate settings when running?
3. I will be glad to uninstall java a switch to different version of the jdk which one is consider to be the most stable atm?
Thanks,
Obe -
Memory Leak issue with TreeView
Hi,
I get Memory Leaks in the TreeView, if I open the stage which contains the TreeView several times.
Everytime I open the stage, I clear the TreeView and populate it with new items.
However there are leaks.
I think this is a bug. But maybe my code is wrong and someone could comment on this issue.
See this test case:
i < 10: 5854 KB
i < 100: 35944 KB
i < 200: 64515 KB
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;
public class TestApp3 extends Application {
public static void main(String[] args) throws Exception {
launch(args);
public void start(final Stage stage) throws Exception {
VBox root = new VBox();
SubStage subStage = new SubStage();
for (int i = 0; i < 10; i++) {
subStage.show();
subStage.hide();
System.gc();
System.out.println((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1024 + " KB");
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
private class SubStage extends Stage {
public SubStage() {
TreeView<String> treeView = new TreeView<String>();
final TreeItem<String> rootNode = new TreeItem<String>("Root");
treeView.setRoot(rootNode);
setOnShowing(new EventHandler<WindowEvent>() {
@Override
public void handle(WindowEvent windowEvent) {
rootNode.getChildren().clear();
rootNode.getChildren().add(new TreeItem<String>("Item"));
Scene scene = new Scene(treeView);
setScene(scene);
}Edited by: csh on 07.09.2012 06:14
Edited by: csh on 07.09.2012 06:14Hi. If You replace
rootNode.getChildren().clear();
rootNode.getChildren().add(new TreeItem<String>("Item"));
with:
rootNode.getChildren().setAll( new TreeItem<String>("Item"));
You will get the following:
i < 10: 2881 KB
i < 100: 3341 KB
I <200: 3478 KB -
Memory leak in MAX Preview resolved by build 411
I was experiencing a memory leak while using the TLF that came as part of Flex 4 MAX Preview. Over the course of several hours, instances of a class called TextAccImpl would rapidly accumulate to the point where they accounted for over 50% of memory usage in my application, severely degrading performance.
Upgrading to weekly build 411 resolved this issue - I didn't try with build 409 to see if it was also affected.
Posting this as I wasn't sure if this entry in the change notes; "Fix a memory leak issue with the TextLayoutFormat cache" was related or not.If you modify the code just to call theCon=scp->getConnection(); and scp->releaseConnection(theCon); in an infinite loop, in as many threads as you like but initially in just one thread, does this program's memory usage stabilise or does it continue to use increasingly more and more memory until it crashes due to lack of memory?
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