Class casting time drain?
is class casting a big time-drain? I wrote a binary search a long time ago in Java (this was before i figure out that there is a binary search in Arrays and Collections). I was casting each time i cut the array in half. when i had 2 or 3 of these objects doing this search (they had 1-1.5 million items each) it was taking my process around 30 hours to complete.
I simply changed this casting binary search to a binarySearch using Collections.binarySearch (ironically, the class i was casting already implemented Comparable LOL).
When i reran this process it only took like 2 hours.
Could class-casting have been the whole culprit? It's the only thing i changed as far as i can tell, but that just seems excessively incredible for such a miniscule change.....
EJP wrote:
OTOH A correctly coded binary search over 1.5 million objects will terminate within 21 steps. Times 3 that is 63 steps. That's 63 comparisons, 63 casts, ... That can only have taken 30 hours if you did the searches zillions of times, which seems pretty strange in itself.Precisely. Even with Collections.binarySearch(), OP's process is taking 2 hours which, even allowing for load time, seems quite a lot.
@OP: Can you elaborate on what your "process" is actually doing? If we knew, we might be able to suggest alternatives. For example, for a simple random selection of items, Collections.shuffle() may be faster.
Winston
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throws FinderException, RemoteException;
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The stack trace in the server logs shows that it is my ejbActivate method in my entity bean causing the problem:
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I have many threads but i was not able to solve this problem.
It has been 2 to 3 weeks that i am struck in this error.
Plz help me with this.
Thanks in advance.
Edited by: vishal29 on Jul 13, 2008 10:04 PMHai DigitalDreamer,
Thanks for giving your valuable time to my question.
I have tried the code you gave me.
The answer for :
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javax.naming.Reference
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[Ljava.lang.Class;@213b6e
Could you please tell me how this can help.
Actually i am new to jsp.
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the snippet of the code is pasted below :
~~~~~~~~~~~~~~~~~~~~~~~code is : ~~~~~~~~~~~~~~~~~~~
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<div>
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<div>
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<div>
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<div>
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<div>
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</div>{</div>
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<div>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~code snippet ends here ~~~~~~~~~~~~~~``
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Any pointers to where anything is getting wrong.
I have jst set the vendorCon to null in the end of the file and not closed it. Subsequently i have closed the logicalCon. This has been mentioned in some of the thread in this forum also.
Thanks,
-jwJatinder Wadhwa wrote:
I 've gone through various threads relating to the topic of Oracle Arrays and the getVendorConnecton API call to avoid the class Cast Exception.. i ve used all these but am still facing the problem...
I would appreciate it if some one could resolve the following queries :
I am using Weblogic 8.1 SP5 with oracle 8i
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~~~~~~~~~~~~~~~~~~~~~~~code is : ~~~~~~~~~~~~~~~~~~~Hi. Show me the whole exception and stacktrace if you do:
try
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finally
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System.out.println(" I ve come to finally");
/*below :
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<div> try </div>
<div>{ </div>
<div>
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</div>
<div>
//Calling the procedure
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<div>
//java.util.Map childMap1 = JDBCcon.getTypeMap();
</div>
<div>
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<div>
childMap1.put("SST_ROUTE_ENTRY", Class.forName("svm.stport.ejb.StaticRouteEntry"));
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<div>
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<div>
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<div>
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</div>
<div>
oracle.sql.ArrayDescriptor arrayDesc1 =
oracle.sql.ArrayDescriptor.createDescriptor("SST_ROUTE_ENTRY_ARR", <b>vendorConn</b>); // here if i use the JDBCcon it works perfectly.... <u>^%^%^%</u>
</div>
<div>
code to fill in the sst route entry array....
.....arrayValues1 */
</div>
<div>
/* oracle.sql.ARRAY array1 = new oracle.sql.ARRAY(arrayDesc1, JDBCcon, arrayValues1); */
</div>
<div>
oracle.sql.ARRAY array1 = new oracle.sql.ARRAY(arrayDesc1, <b>vendorConn</b>, arrayValues1);
</div>
<div>
callStatement = logicalCon.prepareCall( "? = call procName(?, ?, ?)");
</div>
<div>
/* ..code to set the ?s ie array1 */
</div>
<div>
callStatement.execute();
</div>
<div>
}catch(Exceptio e){
</div>
<div>
}</div>
<div>
finally </div>
</div>{</div>
<div>System.out.println(" I ve come to finally"); </div>
<div>}</div>
<div>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~code snippet ends here ~~~~~~~~~~~~~~``
</div>
I have observed that the control immediately comes to the finally block after the call to the createDescriptor line above with <u>^%^%^%</u> in the comment. If i use the JDBCCon in this line...it works perfectly fine.
Any pointers to where anything is getting wrong.
I have jst set the vendorCon to null in the end of the file and not closed it. Subsequently i have closed the logicalCon. This has been mentioned in some of the thread in this forum also.
Thanks,
-jw -
'Class Cast Exception' while invoking a EJB from a Servlet
Hi,
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Could please help me in solving this problem.I am pasting the code here.
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catch(Exception e)
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I came across this kind of problem once. My problem went away after I upgraded
from 5.1 SP6 to 5.1 SP8.
"Dharma" <[email protected]> wrote:
>
>Hi,
>
>I am working on J2EE applications.I am using Webgain studio and weblogic
>server.I
>got a problem while invoking EJB from the servlet.
>
>While calling an EJB from the servlet, it is giving that "Class Cast
>Exception".This
>is because, the remote home reference is not able to type casted to the"Home
>Interface"
>of the EJB, even if I type casted explicitly. It is creating the context
>and able
>to identify the EJB with the JNDI name.
>
>Could please help me in solving this problem.I am pasting the code here.
>
>Thanks in advance,
>Dharma
>
>
>public void doGet(HttpServletRequest req, HttpServletResponse resp)
> throws ServletException, IOException
> {
> resp.setContentType("text/html");
> PrintWriter out = new PrintWriter(resp.getOutputStream());
>
> try
> {
>
> Context context=getInitialContext();
>
> Object reference=context.lookup("ArlProjContractorAppletSession");
>
> ArlProjContractorAppletSessionHome home=(ArlProjContractorAppletSessionHome)PortableRemoteObject.narrow(reference,ArlProjContractorAppletSessionHome.class);
>
>//Exception is occuring in the above statement. It is unable
>//to cast to the home interface
>
> ArlProjContractorAppletSession the_ejb=null;
>
> try
> {
> the_ejb=home.create();
>
> System.out.println("the_ejb = " + the_ejb.toString());
>
> }
> catch(Exception e)
> {
> e.printStackTrace();
> }
> }
> catch(Exception e)
> {
> e.printStackTrace();
> }
> // to do: code goes here.
>
> out.println("<HTML>");
> out.println("<HEAD><TITLE>Contractor TimeTracker</TITLE></HEAD>");
> out.println("<BODY>");
>
> // to do: your HTML goes here.
>
> out.println("</BODY>");
> out.println("</HTML>");
> out.close();
> }
>
>
>
>
>
-
View Criteria in ADF Query Panel with Table-Class Cast Exception
Hi,
I am getting Class Cast Exception when using view criteria for ADF Query Panel with Table. The version I am using is 11g Release 1(11.1.1.2.0)
Here is what I did:
1. created a view criteria on a view object
2. all are optional
3. all are Strings
3. Dragged the view criteria as a query component (ADF Query panel with Query table) on to the design layout
and the error when I clicked the Search button is:
javax.el.ELException: java.lang.ClassCastException: oracle.jbo.common.ViewCriteriaImpl cannot be cast to oracle.jbo.ViewCriteriaRow
at com.sun.el.parser.AstValue.invoke(AstValue.java:161)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:283)
at org.apache.myfaces.trinidad.component.UIXComponentBase.broadcastToMethodExpression(UIXComponentBase.java:1289)
at oracle.adf.view.rich.component.UIXQuery.broadcast(UIXQuery.java:115)
at oracle.adf.view.rich.component.fragment.UIXRegion.broadcast(UIXRegion.java:148)
at oracle.adf.view.rich.component.fragment.UIXRegion.broadcast(UIXRegion.java:148)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.broadcastEvents(LifecycleImpl.java:812)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:292)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:177)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:191)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at sni.foundation.facesextensions.filters.FoundationFilter.doFilter(FoundationFilter.java:92)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:97)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:420)
at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:420)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:247)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:157)
at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:94)
at java.security.AccessController.doPrivileged(Native Method)
at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:138)
at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:70)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.dms.wls.DMSServletFilter.doFilter(DMSServletFilter.java:326)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3592)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2202)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2108)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1432)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Caused by: java.lang.ClassCastException: oracle.jbo.common.ViewCriteriaImpl cannot be cast to oracle.jbo.ViewCriteriaRow
at oracle.adfinternal.view.faces.model.binding.FacesCtrlSearchBinding._clearFilterCriteriaRows(FacesCtrlSearchBinding.java:4549)
at oracle.adfinternal.view.faces.model.binding.FacesCtrlSearchBinding._addFilterCriteria(FacesCtrlSearchBinding.java:4603)
at oracle.adfinternal.view.faces.model.binding.FacesCtrlSearchBinding.processQuery(FacesCtrlSearchBinding.java:423)
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:597)
at com.sun.el.parser.AstValue.invoke(AstValue.java:157)
Thanks
VenkateshHi Frank.
I'm using JDev 11.1.1.3.0 as you suggest the error is no longer present in the latest version.
I can pick my query from the "Saved Search" pick list on the QueryPanel list of queries just fine, and it sets up the filter properly, but when I press the "Search" button, I get the same reported error...
<RegistrationConfigurator><handleError> Server Exception during PPR, #1
javax.el.ELException: java.lang.ClassCastException: oracle.jbo.common.ViewCriteriaImpl cannot be cast to oracle.jbo.ViewCriteriaRow
at com.sun.el.parser.AstValue.invoke(AstValue.java:161)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:283)
at org.apache.myfaces.trinidad.component.UIXComponentBase.broadcastToMethodExpression(UIXComponentBase.java:1303)
at oracle.adf.view.rich.component.UIXQuery.broadcast(UIXQuery.java:115)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.broadcastEvents(LifecycleImpl.java:812)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:292)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:177)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:191)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:97)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:420)
at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:420)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:247)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:157)
at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:94)
at java.security.AccessController.doPrivileged(Native Method)
at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:414)
at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:138)
at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.dms.wls.DMSServletFilter.doFilter(DMSServletFilter.java:330)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.doIt(WebAppServletContext.java:3684)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3650)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2268)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2174)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1446)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Caused by: java.lang.ClassCastException: oracle.jbo.common.ViewCriteriaImpl cannot be cast to oracle.jbo.ViewCriteriaRow
at oracle.adfinternal.view.faces.model.binding.FacesCtrlSearchBinding._clearFilterCriteriaRows(FacesCtrlSearchBinding.java:4588)
at oracle.adfinternal.view.faces.model.binding.FacesCtrlSearchBinding._addFilterCriteria(FacesCtrlSearchBinding.java:4642)
at oracle.adfinternal.view.faces.model.binding.FacesCtrlSearchBinding.processQuery(FacesCtrlSearchBinding.java:424)
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:597)
at com.sun.el.parser.AstValue.invoke(AstValue.java:157)
... 42 more -
Class Cast Exception in a custom adapter processing module
Hi,
I am trying to create a Custom adapter module in my file adapter as a Local enterprise Bean.
I have taken the "ConvertCRLFfromToLF" sample given by SAP as a reference, created an EJB module project, and deployed the enterprise archive to the J2EE engine.
However, i am getting a Class Cast Exception in the Adapter Engine for my communication channel.
Any help on this will much appreciated.
Thanks & Regards,
Renjith.HI,
Managed to solve this..this was due to the additional jars which was included by the Developer Studio in the EAR file. We have to remoce the jars from the EAR, change the application.xml and sap_manifest.mf files to give reference to the jars already deployed in the J2EE engine.
Thanks & Regards,
Renjith -
Difference between narrow() method usage and simple class cast for EJB
Hi,
I have a very simple question:
what is the difference between PortableRemoteObject.narrow(fromObj,
toClass) method usage and simple class cast for EJB.
For example,
1)
EJBObject ejbObj;
// somewhere in the code the home.create() called for bean ...
ABean a = (ABean)PortableRemoteObject.narrow(ejbObj,ABean.class);
OR
2)
EJBObject bean;
// somewhere in the code the home.create() called for bean ...
ABean a = (ABean)ejbObj;
Which one is better?
P.S. I'm working with WL 6.1 sp2
Any help would be appreciated.
Thanks in advance,
Orly[email protected] (Orly) writes:
Hi,
I have a very simple question:
what is the difference between PortableRemoteObject.narrow(fromObj,
toClass) method usage and simple class cast for EJB.
For example,
1)
EJBObject ejbObj;
// somewhere in the code the home.create() called for bean ...
ABean a = (ABean)PortableRemoteObject.narrow(ejbObj,ABean.class);
OR
2)
EJBObject bean;
// somewhere in the code the home.create() called for bean ...
ABean a = (ABean)ejbObj;
Which one is better?(1) is mandated by the spec. It is required because CORBA systems may
not have sufficient type information available to do a simple case.
P.S. I'm working with WL 6.1 sp2 You should always use PRO.narrow()
andy -
Hi
I got class cast exception here
String value = String.valueOf
(((IPrivateMaterialApplicationView.IMaterial_InputElement)(wdContext.nodeMaterial_Input().nodeT_Matno_in().getElementAt(i))).getMatnr());
valueSet.put(value,value);
Thanks & Regards
Ravi Shankar BRavi,
the cause of this issue is that
wdContext.nodeMaterial_Input().nodeT_Matno_in().getElementAt(i)
does not return an instance of type
IPrivateMaterialApplicationView.IMaterial_InputElement
Check what type is returned by this method (in NWDS place your cursor over the method and the return type is displayed) and cast to that type.
Regards
Sebastian
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