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https://issues.apache.org/jira/browse/TUSCANY-2077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12579179#action_12579179
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Simon Nash commented on TUSCANY-2077:
-------------------------------------
Thanks Vamsi for this excellent observation. This is the cause of the problem
and it is related to some changes that I made for TUSCANY-2035. I have a fix
which I am testing now.
> ConversationIds are not always unique
> -------------------------------------
>
> Key: TUSCANY-2077
> URL: https://issues.apache.org/jira/browse/TUSCANY-2077
> Project: Tuscany
> Issue Type: Bug
> Components: Java SCA Core Runtime
> Affects Versions: Java-SCA-1.2
> Environment: Windows XP SP2, Intel Core 2 CPU, 2.6, 2GB Ram, jdk
> 1.5.0_10
> Reporter: Daniel Stucky
> Assignee: Vamsavardhana Reddy
> Attachments: testoneway.zip
>
>
> The attached test works fine if I do NOT mark method run() in Aplha with
> @OneWay.
> The goal is to call Alpha.run() multiple times "concurrently" by using
> @OneWay.
> If I DO mark it with @OneWay sometimes the following error occurs
> Here is the command line output with line numbers:
> 1: Starting ...
> 2: test.composite ready !!!
> 3: GammaImpl:GammaImpl(), conversationId=null
> 4: Gamma:start(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 5: GammaImpl:GammaImpl(), conversationId=null
> 6: Gamma:start(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 7: Gamma:hasNext(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 8: Gamma:next(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 9: value=id_0, conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 10: Gamma:hasNext(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 11: Gamma:next(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 12: value=id_1, conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 13: Gamma:hasNext(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 14: Gamma:next(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 15: value=id_2, conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 16: Gamma:hasNext(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 17: Gamma:hasNext(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 18: Gamma:next(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 19: Gamma:next(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 20: value=id_0, conversationId=3c6df219-e61c-4327-94dc-1cd2b3a08f78
> 21: value=id_3, conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 22: Gamma:hasNext(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 23: Gamma:next(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 24: value=id_4, conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 25: Gamma:hasNext(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 26: Gamma:stop(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> 27: GammaImpl:GammaImpl(), conversationId=null
> 28: Gamma:hasNext(), conversationId=dcde1a3f-8eb0-4e33-84fd-80d7359432b2
> 29: java.lang.NullPointerException
> at services.GammaImpl.hasNext(GammaImpl.java:40)
> 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:585)
> at
> org.apache.tuscany.sca.implementation.java.invocation.JavaImplementationInvoker.invoke(JavaImplementationInvoker.java:109)
> at
> org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke(PassByValueInterceptor.java:108)
> at
> org.apache.tuscany.sca.binding.sca.impl.SCABindingInvoker.invoke(SCABindingInvoker.java:61)
> at
> org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke(PassByValueInterceptor.java:108)
> at
> org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke(JDKInvocationHandler.java:287)
> at
> org.apache.tuscany.sca.core.invocation.JDKInvocationHandler.invoke(JDKInvocationHandler.java:155)
> at $Proxy14.hasNext(Unknown Source)
> at services.AlphaImpl.run(AlphaImpl.java:26)
> 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:585)
> at
> org.apache.tuscany.sca.implementation.java.invocation.JavaImplementationInvoker.invoke(JavaImplementationInvoker.java:109)
> at
> org.apache.tuscany.sca.core.databinding.wire.PassByValueInterceptor.invoke(PassByValueInterceptor.java:108)
> at
> org.apache.tuscany.sca.core.invocation.NonBlockingInterceptor$1.run(NonBlockingInterceptor.java:71)
> at org.apache.tuscany.sca.core.work.Jsr237Work.run(Jsr237Work.java:61)
> at
> org.apache.tuscany.sca.core.work.ThreadPoolWorkManager$DecoratingWork.run(ThreadPoolWorkManager.java:214)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
> at java.lang.Thread.run(Thread.java:595)
> 30: Gamma:stop(), conversationId=5297f3ca-8c6e-4b65-a5e6-5c4fee0457b6
> This is a strange problem that is not always reproduceable but only from time
> to time. I guess it's a concurrency issue. At first I've seen this only while
> debugging, but I managed to get the exception using sleep().
> In line 3-5 two instances of Gamma are created and on each the method start
> is called. Note that both use the same conversationID. This should not be the
> case!
> In line 27 another instance of Gamma is created. Why ? No method start() is
> called !
> Then in line in method hasNext() the conversationId suddenly is
> dcde1a3f-8eb0-4e33-84fd-80d7359432b2. I guess it is the firts method executed
> on this new instance, thus creating a new conversationId. And as no start()
> was called, the internal list is not initialized but NULL.
> Is there a conceptual problem with my code?
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