Java Networking thread?

i am wondering if i can post a Java Network thread here? or is there a specific thread for Networks?

Why, is going through the list of forums too much of a task?
[_Core APIs - Networking_|http://forums.sun.com/forum.jspa?forumID=536]
db

Similar Messages

Java Networking Books

I am doing a project in Java Networking,kindly suggest me a good,solid
book on Java Networking.

I think the combination of the worker thread from Example 12.2 and its driver Example 12.3 do not distribute connections evenly among threads. Or, am I wrong?
p.s. Hey Mr Moderator
If you feel like to delete existing forum thread(s), please give prior alert.
We have to take backup.

Java networking(video)

hi
i wud like 2 tranfer video between two clients using java networking.how can i do this?

Open server socket on first client, open client socket on second, accept connection, create input and output threads, transfer data, close everything.
That's all.

Java network project

Hello,
I am looking for an interesting and challenging java network project related to IPV6.
all ideas are welcome.
thanks a lot
sebastien

Double-post: http://forum.java.sun.com/thread.jspa?threadID=596186

Thread unserialized exception: NotSerializableException: java.lang.Thread

hello experts,
i have this exception coming; seems to be coming from some thread but i removed all the threads from my code, i thought its because of some object which is still unserialized, i am not sure whether this is because of one unserialized object or its because of more reasons, please have a look:
Exception in client main: java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
     java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: java.lang.Thread
java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
     java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: java.lang.Thread
     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:173)
     at BallServerImpl_Stub.getAllBallProxies(Unknown Source)
     at CopyOfManyMovingBalls.<init>(CopyOfManyMovingBalls.java:80)
     at CopyOfManyMovingBalls$2.run(CopyOfManyMovingBalls.java:294)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: java.lang.Thread
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1333)
     at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
     at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
     at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1667)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1323)
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
     at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:306)
     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:155)
     ... 11 more
this is coming when i m accessing this method:
class BallServerImpl extends UnicastRemoteObject
implements BallServer
* @return an enumeration of all Balls as proxy objects
public Ball[] getAllBallProxies() throws java.rmi.RemoteException
     Ball[] locations1 = new Ball[hash.size()];
java.util.Enumeration iter = hash.elements();
int idx = 0;
while (iter.hasMoreElements())
     BallImpl impl = (BallImpl)iter.nextElement();
locations1[idx++] = new BallProxy(impl);
return locations1;
why this function is running fine when i m calling this from client unlike getAllBallProxies() nevertheless both are returning the same thing:
* @return an enumeration of all Balls as remote references
public Ball[] getAllBalls()
     Ball[] locations = new Ball[hash.size()];
java.util.Enumeration iter = hash.elements();
int idx = 0;
while (iter.hasMoreElements())
locations[idx++] = (Ball)iter.nextElement();
return locations;
the proxy Class:
* The Proxybouncing ball.
public class BallProxy implements Serializable,Ball {
* The Real bouncing ball.
public class BallImpl extends UnicastRemoteObject implements IBallRemote,Serializable
*load of thanks as this is "SHOW STOPPER",
jibbylala*
Edited by: 805185 on Oct 25, 2010 8:33 PM
Edited by: 805185 on Oct 25, 2010 8:39 PM
Edited by: 805185 on Oct 25, 2010 9:21 PM
Edited by: 805185 on Oct 25, 2010 9:25 PM
Edited by: 805185 on Oct 25, 2010 9:27 PM
Edited by: 805185 on Oct 25, 2010 9:46 PM

that there was some thread there in BallProxy but i removed all from them and now testingIf you don't post the code people ask to see, you may never get a useful answer here.
P.S i didn't know that threads are not SerializedThe Thread class is not Serializable. Precision please.
Now i m updating the code, i needed the confirmationConfirmation of what?
and now trying to avoid them.Them?
But what if i need them.Them?
Please make the effort to express yourself clearly. You've already been told you're not making much sense and you haven't done anything about it.
how can we make serialized?The concept of serializing a Thread makes no sense whatsoever. You don't want to do it. You don't need to do it. You can't do it. It wouldn't work if you could do it.
Somewhere or other you have a class member that is a reference to a Thread. Remove it or make it transient. If you post the code somebody may help you. If you don't, nobody can possibly do that.

Deprecated methods in java.lang.thread

Hi,
I am getting the followng warning message when i run my code:
The method void stop() in class java.lang.Thread has been deprecated,
can anyone suggest an alternative method to the deprectaed stop method, i can't seem to find one.
Thanks in advance

The stop() method in thread has been deprecated because it is inherently dangerous. The suggested action now is to simply modify a variable inside the thread to tell it to stop running, and the thread should periodically check the variable to see when it should stop. There's good description of why stop() and a few other methods in Thread have been deprecated at..
http://java.sun.com/j2se/1.4/docs/guide/misc/threadPrimitiveDeprecation.html

Newbie question on JAVA networking

Hi,
I'm newbie on JAVA networking. Can anyone guide me to do a task to :
read the TCP/IP packets which are sent from a specific host to another host? I need to capture the packets and analyse the contents.
thanks in advance,
jackling

Well I've search google for a low level TCP api, but I came up with absolutely no results. So I guess the only way would be to write your own native API (using C/C++) and call this through the Java Native Interface.

Know Exceptions thrown in Java Finalizer thread...

Hello,
I have one question regarding java finalizer thread.
How can i know about exceptions thrown by finalize method which has been called from the finalizer thread of JVM?.
Any help would be appreciated?
Thanks and Regards

vinodpatel2006 wrote:
Hello,
Thanks for reply...
But why i can't? There must be some mechanisum using i can know thrown exception.No
>
Because, in my application, i am writing finalize methods for each and every object to null out the member variable. I want to make sure that each of those methods work perfactly. I mean, does any of them throws exception OR not.What? Why are you doing that? That sounds pretty stupid. The GC will take care of those objects.
Kaj

Collection not in context? java.lang.Exception: java.lang.Thread.dumpStack(Thread.java:1342)

Hi
I am using JDev12c. I have an isolated taskflow that is consuming three more taskflow as a region.
This is the scenario: I have a viewObject showing UserDetails. So I have make a taskflow to show the user details in a form. Now, the userDetalsVO has a ViewLink with itself (Managers having employees under their supervision).
LoggedInUser (userVO)
- Employees (userVO)
I have created the list of employee using the Employees Iterator. However, every time I select an employee the console throw the following error:
<The row key or row index of a UIXCollection component is being changed outside of the components context. Changing the key or index of a collection when the collection is not currently being visited, invoked on, broadcasting an event or processing a lifecycle method, is not valid. Data corruption and errors may result from this call. Turn on fine level logging for a stack trace of this call. Component ID: {0}>
java.lang.Exception: Stack trace:
at java.lang.Thread.dumpStack(Thread.java:1342)
at org.apache.myfaces.trinidad.component.UIXCollection._verifyComponentInContext(UIXCollection.java:2212)
at org.apache.myfaces.trinidad.component.UIXCollection.setRowKey(UIXCollection.java:524)
at oracle.adf.view.rich.component.rich.data.RichListView.visitChildren(RichListView.java:112)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:703)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:566)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:362)
at org.apache.myfaces.trinidad.component.UIXComponent.visitAllChildren(UIXComponent.java:445)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:423)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:703)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:566)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:362)
at org.apache.myfaces.trinidad.component.UIXComponent.visitAllChildren(UIXComponent.java:445)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:423)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:703)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:566)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:362)
at org.apache.myfaces.trinidad.component.UIXComponent.visitAllChildren(UIXComponent.java:445)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:423)
at oracle.adf.view.rich.component.fragment.UIXRegion.visitChildren(UIXRegion.java:952)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:703)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:566)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:362)
at org.apache.myfaces.trinidad.component.UIXComponent.visitAllChildren(UIXComponent.java:445)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:423)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:703)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:566)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:362)
at org.apache.myfaces.trinidad.component.UIXComponent.visitAllChildren(UIXComponent.java:445)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:423)
at oracle.adf.view.rich.component.fragment.UIXRegion.visitChildren(UIXRegion.java:952)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:703)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:566)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:362)
at org.apache.myfaces.trinidad.component.UIXComponent.visitAllChildren(UIXComponent.java:445)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:423)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:703)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:566)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:362)
at org.apache.myfaces.trinidad.component.UIXComponent.visitAllChildren(UIXComponent.java:445)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:423)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:703)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:566)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:362)
at org.apache.myfaces.trinidad.component.UIXShowOne.visitTree(UIXShowOne.java:135)
at org.apache.myfaces.trinidad.component.UIXComponent.visitAllChildren(UIXComponent.java:445)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:423)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:703)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:566)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:362)
at org.apache.myfaces.trinidad.component.UIXComponent.visitAllChildren(UIXComponent.java:445)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:423)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:703)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:566)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:362)
at org.apache.myfaces.trinidad.component.UIXComponent.visitAllChildren(UIXComponent.java:445)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:423)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:703)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:566)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:362)
at org.apache.myfaces.trinidad.component.UIXComponent.visitAllChildren(UIXComponent.java:445)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:423)
at org.apache.myfaces.trinidad.component.UIXComponent.visitChildren(UIXComponent.java:703)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:566)
at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:362)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._deliverPostRestoreStateEvents(LifecycleImpl.java:852)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._restoreView(LifecycleImpl.java:791)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:397)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:225)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:280)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:254)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:136)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:341)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:25)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:192)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:106)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:478)
at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:478)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:303)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:208)
at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:137)
at java.security.AccessController.doPrivileged(Native Method)
at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:315)
at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:460)
at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:120)
at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:217)
at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:81)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:225)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:79)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3367)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3333)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:57)
at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2220)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2146)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2124)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1564)
at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:254)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:295)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:254)
The front end behaves fine though but that error in the console is bugging me.
Any Ideas??
Regards

Well, have you run the app with logging set to fine as the message suggested?
Turn on fine level logging for a stack trace of this call. Component ID: {0}
Then a test case and a detailed description on how to reproduce the error, built on the hr schema, can help.
Timo

Cannot find class java/lang/Thread

I'm getting this error trying to compile a program that I'm writing in java. Its a very simple program just to get me back to basics. Any ideas as to how I can fix this problem??

Extracted from Sun's website,
* Error Message: "Exception in thread NULL" or
"Unable to initialize threads: cannot find class java/lang/Thread"
If you are getting one of these fatal error messages when running java,
javac, or appetviewer, you should check your CLASSPATH environment variable.
It may list "c:\java" or the "classes" directory from an older release. You can either unset the CLASSPATH variable, or set it to
include only the latest version of the Java platform class library. For example:
C:\> set CLASSPATH=.;C:\jdk1.1.8\lib\classes.zip
This will make sure that you are using the correct classes for this release.
-- Sudha

Replace the wait with java embedding thread.sleep() function

Hi,
How to replace the wait with java embedding thread.sleep() function. Can anyone help.
Thanks.

drag and drop the java embedding component
include the following code in it.
try{
Thread.sleep(60000);
}catch(Exception e)
--Prasanna

Java.lang.thread exception while using Xalan 2.0 in WLS 6.0

Hi, I'm trying to use Xalan 2.0 in a servlet hosted by WLS. Ive
modified Xalan's SimpleTransform sample to be a servlet. I
create a Transformer with the .xsl, then call tranform() to
print the tranformed xml to the response stream. The xml is
tranformed correctly, but it throws a java.lang.thread
exception. The standalone Xalan sample doesn't do this. Anyone
else seen this problem?
Here's the code of interestest, I apologize if its not formatted very well:
public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException
     PrintWriter out = res.getWriter();
     res.setContentType("text/html");
     out.println("<html><head><title>XalanTest<title></head>");
     out.println("<body><h1>XalanTest</h1>");
     try{
     TransformerFactory tFactory = TransformerFactory.newInstance();
     StreamSource ss = new StreamSource("file:\\\\My-path\\birds.xsl");
     Transformer transformer = tFactory.newTransformer(ss);
     StreamResult SR = new StreamResult(out);
     transformer.transform(new StreamSource("file:\\\\My-path\\birds.xml"), SR );
     catch(Exception e){
     out.println("<p>" + e.toString() + "</p>");
     e.printStackTrace(out);
     out.println("<p>Exception</p>");
          out.println("</body></html>");

It also looks like the workaround suggested does not work.
I put the following code as workaround:
     response.setContentType("text/html");
     response.setHeader ("Pragma", "no-cache");
     Transformer transformer;
     TransformerFactory factory = TransformerFactory.newInstance();
     String stylesheet = "config\\closs\\applications\\webroot\\jsp\\example\\Load2.xsl";
     String sourceId = "config\\closs\\applications\\webroot\\jsp\\example\\Load2.xml";
     String outputFile = "config\\closs\\applications\\webroot\\jsp\\example\\Load2.html";
     String outputDirectFile = "config\\closs\\applications\\webroot\\jsp\\example\\Load2_Direct.html";
     try
          PrintWriter fout = new PrintWriter (new FileOutputStream (outputFile));
          OutputStream os = new ByteArrayOutputStream();
          transformer = factory.newTransformer(new StreamSource(stylesheet));
          transformer.transform(new StreamSource(sourceId), new StreamResult(outputDirectFile));
          transformer.transform(new StreamSource(sourceId), new StreamResult(os));
          os.flush ();
          os.close();
          out.print(os.toString());
          fout.print (os.toString ());
          fout.flush ();
          fout.close ();
     catch (Exception e)
          // Error Handler
     e.printStackTrace();
The two .html files produced look exactly the same, which is good.
However, the screen output to my html browser (Internet Explorer 5.50 sp1) produces
different output.
That is strange, but that shows that this bug does not have a known workaround
"Rabinowitz" <[email protected]> wrote:
>
I have the same problem with java sun xml parser (jaxp 1-1)
It is interesting to know that all this perfectly works under weblogic
5.1, so
I cannot migrate my application to 6.0
So, the functionality of weblogic 6.0 degraded since 5.1.
I cannot buy the explanation that that is not bea's fault, because it
perfectly
worked with the same version of xml parser.
Now, their customer support is saying they have not decided whether this
is a
bug or a feature.
Interesting to know that degradation of functionality could be a feature!
It is now June 21, 3 months since this bug was reported, sp2 was shipped
since
that time, and this bug is still there.
"Chuck H. Zhao" <[email protected]> wrote:
I am having the exact same problem you are having. If we analyze the
stack
trace:
javax.xml.transform.TransformerException: java.lang.Thread
at
org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.j
ava:1212)
at
org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:2894)
at java.lang.Thread.run(Thread.java:484)
java.lang.ClassCastException: java.lang.Thread
at
weblogic.servlet.internal.ResponseHeaders.setDateHeader(ResponseHeaders.java
:273)
at
weblogic.servlet.internal.ServletResponseImpl.setDateHeader(ServletResponseI
mpl.java:449)
at
weblogic.servlet.internal.ServletResponseImpl.writeHeaders(ServletResponseIm
pl.java:637)
at
weblogic.servlet.internal.ServletOutputStreamImpl.flush(ServletOutputStreamI
mpl.java:124)
at
weblogic.servlet.internal.WLOutputStreamWriter.flush(WLOutputStreamWriter.ja
va:124)
at java.io.PrintWriter.flush(PrintWriter.java:120)
at
org.apache.xalan.serialize.SerializerToXML.flushWriter(SerializerToXML.java:
1431)
at
org.apache.xalan.serialize.SerializerToXML.endDocument(SerializerToXML.java:
629)
at
org.apache.xalan.transformer.ResultTreeHandler.endDocument(ResultTreeHandler
..java:180)
at
org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.j
ava:1194)
at
org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:2894)
at java.lang.Thread.run(Thread.java:484)
What happened is: to support incremental output, Xalan-Java performs
the
transformation in a second thread while building the source tree inthe
main
thread. So Transformer.transform() creates a new thread to run the
transformer.run() method, which will write to weblogic's internal
ServletOutputStreamImpl, and in the end calls flush() on it.
ServletOutputStreamImpl determines that the headers haven't been written
yet, and the headers need to be written before any servlet output, so
it
calls ServletResponseImpl.writeHeaders(), which eventually calls
ResponseHeaders.setDateHeader(). The last method assumes the thread
is
weblogic's internal ExecuteThread and tries to cast the thread as such,
maybe to get the date from it. But the thread is a plain java.lang.Thread
created by xalan, thus we get the java.lang.ClassCastException:
java.lang.Thread
This suggests a second workaround: call ServletResponse.flushBuffer()
before any xalan stuff, which will force the headers to be written in
weblogic's ExecuteThread. The shortcoming of this is that this will
cause
the response to be commited, and if the xalan stuff throws exception
you can
not forward to another page.
Another thing is that xalan should not directly call flush() on
ServletOutputStreamImpl at all. I will report it to xalan and see if
they
consider that a bug. If they fix that then we have a third workaround:
set
the buffer size of ServletResponse big enough to accomodate everything
including the xslt outputs, so the ServletOutput does not need to be
flushed
during xalan code.
I do not consider this problem a weblogic bug, since the servlet container
has to right to expect any thread inside it to be its own. Serlvet2.2
spec
says:
1.2 What is a Servlet Container?
A Servlet Container may place security restrictions on the environment
that
a servlet executes in. In
a Java 2 Platform Standard Edition 1.2 (J2SE) or Java 2 Platform Enterprise
Edition 1.2 (J2EE)
environment, these restrictions should be placed using the permission
architecture defined by Java 2
Platform. For example, high end application servers may limit certain
action, such as the creation of
a Thread object, to insure that other components of the container are
not
negatively impacted.
Weblogic should explicitly warn the developers that creating threads
inside
the servlet container may have adverse effects, the same kind of problem
we
are having. (or maybe they already did somewhere in their documentation?)
On the xalan side, I would suggest them to either give the option to
switch
the two threads, or to give the option to buffer the output and write
it out
in the main thread, which is exactly what you did in your first workaround.
Any comments or thoughts on the subject are welcome.
-- Chuck Zhao
"MK Parini" <[email protected]> wrote in message
news:[email protected]...
I found, what I think to be a bug, and a work-around for it.
When doing an XSLT Transformation, you must specify a StreamResult
to which to write the output. I was doing my transformation in
a
servlet so I was writing my output to the HttpResponse
(The variable res is a javax.servlet.http.HttpServletResponse
object)
StreamResult htmlTarget = new StreamResult(res.getWriter());
If I use this, when I perform the transformation using the TRAX
APIs,
InputStream xslFile = context.getResourceAsStream(fileName);
TransformerFactory tFactory = TransformerFactory.newInstance();
Templates xslTemplates = tFactory.newTemplates(new StreamSource(xslFile));
transformer = xslTemplates.newTransformer();
transformer.transform(xmlSource, htmlTarget);
I receive the ClassCastException from the class
weblogic.servlet.internal.ResponseHeaders.setDateHeader(ResponseHeaders.java
:273),
as seen in my previous posting.
I discovered, if I write my output to a StringBuffer, and then
I write
the StringBuffer to the HttpResponse, I do not get the ClassCastException.
For example,
StringWriter myWriter = new StringWriter(2400);
StreamResult htmlTarget = new StreamResult(myWriter);
<Same transformation code as above>
myWriter.close();
PrintWriter out = res.getWriter();
out.print(myWriter.toString());
Is this a bug in the weblogic internal servlet class or am I just
missing something?
Also, one concern that I have with the workaround is that it might
hurt performance.
Any comments or thoughts on the subject are welcome.

URGENT- PLEASE HELP: java.lang.threads and BC4J

Hi,
according to my issue "no def found for view" in the same titled thread I'm wondering how you would implement asynchronous calls of methods that use BC4J to update a couple of data.
To be more precise:
A requirement of our software is to start an update database job, which can take a couple of minutes/hours, from the web browser. Before it will be executed the logged-in user receives a notification that this batch job has been started.
I dont't want to use JMS overhead and MD Beans for this simple requirement, therefore I implemented a class that extends java.lang.Thread and put all the update codings within the run method. After having called the start-method of the thread I get a JBO-25022(No XML file found) error when I try to set a new value for an attribute of the row. The row consists of attributes which belong to four entity objects that mus be updated.
When calling the run method directly, everything works fine.
My questions:
* do you know any workaround how to make the xml files
reachable?
* how would you implement anschronous calls of long time-
consuming jobs?
* is this a bug of BC4J?
Any help, tip, hint is really appreciated.
Stefan

Arno,
many thanks for your reply:
Here is an excerpt of the source code of my thread "Aenderungsdienst":
public class Aenderungsdienst extends java.lang.Thread
private SviAdministrationModuleImpl mSviModul;
// Application module that contains view object
// IKViewImpl
public Aenderungsdienst(SviAdministrationModuleImpl aSviModul)
mSviModul = aSviModul;
public void run()
ausfuehrenAenderungsdienst(mAenderungsdienstNr); <--error within this methode
private int ausfuehrenAenderungsdienst(String aAenderungsdienstNr)
int rAnzahlSaetze = 0;
try
IkViewImpl aenderungen = mSviModul.getIkView();
aenderungen.suchenAenderungssaetze(aAenderungsdienstNr); <-- method within View Object Impl that executes a query with customized where-clauses
if ((rAnzahlSaetze = aenderungen.getRowCount()) > 0)
IkViewRowImpl ik = null;
while (aenderungen.hasNext())
ik = (IkViewRowImpl) aenderungen.next();
ik.setBestandsstatus("B"); <-- error occurs here when setting the status of a current row in my rowset to "B"
mSviModul.getTransaction().postChanges();
mSviModul.getTransaction().commit();
catch (Exception e)
e.printStackTrace();
mSviModul.getTransaction().rollback();
//todo: Verarbeitungsprotokoll erstellen
return rAnzahlSaetze;
This thread will be called by the application module "sviAdministrationModuleImpl":
public void ausfuehrenAenderungsdienst(String
aAenderungsdienstNr)
Aenderungsdienst aenderungsdienst = new
Aenderungsdienst(this);
aenderungsdienst.setAenderungsdienstNr
(aAenderungsdienstNr);
aenderungsdienst.start();
Using the start() method of the thread causes this exception:
[653] No xml file: /hvbg/svi/model/businessobjects/businessobjects.xml, metaobj = hvbg.svi.model.businessobjects.businessobjects
[654] Cannot Load parent Package : hvbg.svi.model.businessobjects.businessobjects
[655] Business Object Browsing may be unavailable
[656] No xml file: /hvbg/svi/model/businessobjects/IK_Inlandsbankverb.xml, metaobj = hvbg.svi.model.businessobjects.IK_Inlandsbankverb
09.03.2004 10:27:41 hvbg.common.businessobjects.HvbgEntityImpl setAttributeInternal
SCHWERWIEGEND: Fehler beim Setzen des Attributs 1 im Entity Objekt: JBO-25002: Definition hvbg.svi.model.businessobjects.IK_Inlandsbankverb vom Typ Entitätszuordnung nicht gefunden.
09.03.2004 10:27:42 hvbg.svi.model.dienste.Aenderungsdienst ausfuehrenAenderungsdienst
SCHWERWIEGEND: Beim Ausführen des Aenderungsdienstes 618 trat während der DB-Aktualisierung ein schwerer Fehler auf:
JBO-25002: Definition hvbg.svi.model.businessobjects.IK_Inlandsbankverb vom Typ Entitätszuordnung nicht gefunden.
oracle.jbo.NoDefException: JBO-25002: Definition hvbg.svi.model.businessobjects.IK_Inlandsbankverb vom Typ Entitätszuordnung nicht gefunden.
     at oracle.jbo.mom.DefinitionManager.findDefinitionObject(DefinitionManager.java:328)
     at oracle.jbo.mom.DefinitionManager.findDefinitionObject(DefinitionManager.java:268)
     at oracle.jbo.server.MetaObjectManager.findMetaObject(MetaObjectManager.java:649)
     at oracle.jbo.server.EntityAssociation.findEntityAssociation(EntityAssociation.java:98)
     at oracle.jbo.server.AssociationDefImpl.resolveEntityAssociation(AssociationDefImpl.java:725)
     at oracle.jbo.server.AssociationDefImpl.getEntityAssociation(AssociationDefImpl.java:135)
     at oracle.jbo.server.AssociationDefImpl.hasContainer(AssociationDefImpl.java:546)
     at oracle.jbo.server.AssociationDefImpl.getContainer(AssociationDefImpl.java:468)
     at oracle.jbo.server.EntityImpl.getContainer(EntityImpl.java:1573)
     at oracle.jbo.server.EntityImpl.setValidated(EntityImpl.java:1649)
     at oracle.jbo.server.EntityImpl.setAttributeValueInternal(EntityImpl.java:2081)
     at oracle.jbo.server.EntityImpl.setAttributeValue(EntityImpl.java:1985)
     at oracle.jbo.server.AttributeDefImpl.set(AttributeDefImpl.java:1700)
     at oracle.jbo.server.EntityImpl.setAttributeInternal(EntityImpl.java:946)
     at hvbg.common.businessobjects.HvbgEntityImpl.setAttributeInternal(HvbgEntityImpl.java:56)
     at hvbg.svi.model.businessobjects.IKImpl.setBestandsstatus(IKImpl.java:174)
     at hvbg.svi.model.businessobjects.IKImpl.setAttrInvokeAccessor(IKImpl.java:770)
     at oracle.jbo.server.EntityImpl.setAttribute(EntityImpl.java:859)
     at oracle.jbo.server.ViewRowStorage.setAttributeValue(ViewRowStorage.java:1108)
     at oracle.jbo.server.ViewRowStorage.setAttributeInternal(ViewRowStorage.java:1019)
     at oracle.jbo.server.ViewRowImpl.setAttributeInternal(ViewRowImpl.java:1047)
     at hvbg.svi.model.dataviews.IkViewRowImpl.setBestandsstatus(IkViewRowImpl.java:264)
     at hvbg.svi.model.dienste.Aenderungsdienst.ausfuehrenAenderungsdienst(Aenderungsdienst.java:337)
     at hvbg.svi.model.dienste.Aenderungsdienst.run(Aenderungsdienst.java:290)
Using run(), everything works perfectly.
The view object IKView consists of four entity objects which are linked by associations. There exists an association between the entity objects ik and inlandbankverb. The xml-file for the association object is named "ik_inlandsbankverb.xml". It seems so that this definition could not be found when calling my thread in asynchronous (via start()-method call) mode.
Is this a bug of JDeveloper?
Thanks in advance,
Stefan

Urgent Help in Java Networking

Dear Sir,
I've written an encryption algorithm.My problem is i 've to encrypt
a file using the algorithm above at one computer.The receiver in another computer should get this file and decrypt it at another
computer.I have written both encryption and decryption algorithms
but i dont know Java networking API.Could you give me detailed step by
step networking code with documentation which connects both encryption and decryption algorithms at different computers.GUI Support in networking api is appreciated .Please sen the reply to [email protected]
Thanks in advance

Have you looked at JSSE (Java Secure Socket Extensions)?
Using SSL is perhaps the best solution to your problem.
You can find a lot of info in:
Java Security - 2nd Ed, by Scott Oaks and and in
Java Networking (or something like) 2nd Ed, by E. R. Harold.

Non-static version of java.lang.Thread.dumpstack?

hi,
it would be useful sometimes to have a graphical debug panel on an application I'm working on which shows the active threads and allows further information to be shown if wanted - the problem is that I can't find an API call to get the current stack dump of an arbitrary thread - does anyone know if this is possbile somehow without a full debug environment?
java.lang.Thread.dumpstack would be ideal if only it were an instance method..
thanks,
asjf

what's the probelm? you call this in the threads class
and each thread (object) executes this statement and
therefore prints its stacktrace ...ok - here is some mocked up (and plain wrong in terms of the tree model's consistency over sequential method calls) code that shows what I'd like to achieveimport java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import javax.swing.event.*;
public class JThreadExp extends JPanel {
   JTree tree;
   JTextArea jta;
   public JThreadExp(TreeModel model) {
      super(new GridLayout(1,2,4,4));
      tree = new JTree(model);
      jta = new JTextArea();
      add(tree);
      add(jta);
      tree.addTreeSelectionListener(new TreeSelectionListener() {
         public void valueChanged(TreeSelectionEvent e) {
            PrintStream stderr = System.err;
            String msg=null;
            try {
               TreePath tp = e.getPath();
               System.out.println(tp.getLastPathComponent());
               ByteArrayOutputStream baos = new ByteArrayOutputStream();
               PrintStream ps = new PrintStream(new BufferedOutputStream(baos, 1024*1024));
               System.setErr(ps);
               Thread t = (Thread) tp.getLastPathComponent();
               try {
                  t.dumpStack();
               } catch(Throwable ee) {}
               ps.close();
               jta.setText(baos.toString()); //newXML.toString());
            } catch(Exception e2) {
               msg = e2.getMessage();
            System.setErr(stderr);
            if(msg!=null)
               System.out.println(msg);
   public static void main(String[]arg) throws Exception {
      JFrame frame = new JFrame("JThreadExp");
      JThreadExp jte;
      final ThreadModel tm = new ThreadModel();
      frame.getContentPane().add(jte = new JThreadExp(tm));
      frame.pack();
      frame.setVisible(true);
      final JTree tree = jte.tree;
      new Thread(new Runnable() {
         public void run() {
            try {
               while(true) {
                  TreeModelEvent tme = new TreeModelEvent(this, new Object [] {tm.getRoot()});
                  for(Iterator i = tm.listeners.iterator(); i.hasNext(); )
                     ((TreeModelListener) i.next()).treeStructureChanged(tme);
                  Thread.sleep(5000);
                  new Thread(new Runnable() {
                     public void run() {
                        try { Thread.sleep(50000); } catch(Exception e) {e.printStackTrace();}
                  } ).start();
            } catch(Exception e) {
               e.printStackTrace();
      } ).start();
class ThreadModel implements TreeModel {
   public boolean isLeaf(Object node) { return (node instanceof Thread); }
   public Object getRoot() {
      ThreadGroup uppermost = Thread.currentThread().getThreadGroup();
      while(uppermost.getParent()!=null)
        uppermost = uppermost.getParent();
      return uppermost;
   public Object getChild(Object p, int i) {
      Object result = "<unavailable>";
      if(p instanceof ThreadGroup) {
         ThreadGroup parent = (ThreadGroup) p;
         ThreadGroup[] tg = new ThreadGroup[parent.activeGroupCount()];
         Thread[] t = new Thread[parent.activeCount()];
         parent.enumerate(tg, false);
         parent.enumerate(t, false);
         if(i<tg.length)
            result = tg;
else if(i<tg.length+t.length)
result = t[i-tg.length];
return result;
public int getChildCount(Object node) {
int result = 0;
if(node instanceof ThreadGroup) {
ThreadGroup parent = (ThreadGroup) node;
ThreadGroup[] tg = new ThreadGroup[parent.activeGroupCount()];
Thread[] t = new Thread[parent.activeCount()];
result += parent.enumerate(tg, false);
result += parent.enumerate(t, false);
return result;
public int getIndexOfChild(Object parent, Object child) {
for(int i=0; i<getChildCount(parent); i++) {
if(getChild(parent,i).equals(child))
return i;
return -1;
Set listeners = new HashSet();
public void addTreeModelListener(TreeModelListener l) {
listeners.add(l);
public void removeTreeModelListener(TreeModelListener l) {
listeners.remove(l);
public void valueForPathChanged(TreePath path, Object newValue) { // this shouldn't be called - Tree is not editable
System.out.println("valueForPathChanged");
} The problem is that I'd like to obtain a reference to a Thread object (which I haven't written the code for) and get a (vaguely accurate if not exact) stack dump from it.
I'll have a look over JDB in the meantime thanks :)
thanks,
asjf

Java Networking thread?

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