Re: NoClassDefFoundError, apparently in Axis2

Sat, 30 Sep 2006 07:07:35 -0700 

Some more thoughts on this.
The specs (assembly and C&I) do not seem to be very explicit about what should happen with an interface that is annotated as @Callback and that defines more than one method. But notice that if this is the case then the next question pertains to a previous question, which is what happens when the callback interface (the one in the annotation, not the annotated one) has more than one method. 


Let i1 be an intrerface annotated with @Callback(c1), where c1 is the 
callback interface. The simplest case is when both i1 and c1 have only one 
method. If i1 has > 1 methods there are two cases: c1 has only one method, 
and c1 has > 1 methods. The first case is the case at hand. Notice that one 
last case is where i1 has one method and c1 has > 1, but that really is a 
special case of the second case.



The second case is the one we had asked about before, how do we associate 
methods in c1 with methods in i1. Again, the specs are not explicit about 
this. In general, this association may require knowledge about the 
implementation of i1. That is, i1Impl will get an injected instance of c1 
which then it will use in its method(s) to make callback invocations. Which 
c1 method is invoked in i1 is arbitrary and we may have to resort to 
non-trivial introspection to figure it out. Btw, nontice that this case also 
includes the first case.


So it seems we have a choice of how to interpret the specs.
1- The simplest choice is to assume i1 and c1 both have only one method.

2- We can assume that c1 has only one method (case at hand) and introspect 
each method in i1 to figure out which is intended as async with callback and 
which is not. In addition, here we also have a choice of whether to treat 
non-callback methods as sync or async.

3- We can try go for the general case.


My vote is to go with choice 1, which is what I have been assuming so far, 
at least for the coming release. And if we don't feel comfortable with this 
choice long term, then we can try for choice 2 or maybe even choice 3, if we 
can make sense of it.
It would also be useful to try to go back to the spec collaboration to try 
to calrify the intent.


Thoughts?


----- Original Message ----- 
From: "Ignacio Silva-Lepe" <[EMAIL PROTECTED]>

To: <[email protected]>
Sent: Friday, September 29, 2006 8:58 PM
Subject: Re: NoClassDefFoundError, apparently in Axis2



Yeah, one option could be to assume that if an interface is annotated as 
having a callback, then all of its methods need to be one-way. 
Alternatively, we may need to introspect each method. If a method has a 
return value then it follows that it does not have a callback. But does it 
get invoked asynchronously?



For now the sample could be tweaked further, or perhaps separated into a 
new sample, which I was trying to avoid.



----- Original Message ----- 
From: "Raymond Feng" <[EMAIL PROTECTED]>

To: <[email protected]>
Sent: Friday, September 29, 2006 6:51 PM
Subject: Re: NoClassDefFoundError, apparently in Axis2


Hi, Ignacio.


I can now reach a point that we use the Axis2 client to invokes the WS 
asynchronously (operationClient.invoke(false)) but it fails after that 
because the DataBindingInterceptor excepts a synchronous response but a 
"ImmutableMessage" is returned instead. So the question is that how do we 
tell if a given operation is invoked asynchronously or not.


For the test case, we have the following interface:

@Callback(HelloWorldCallback.class)
public interface HelloWorldService {
   public String getGreetings(String name);

   @DataType(name="commonj.sdo.DataObject")
   public String getGreetings1(DataObject name);

   public void getGreetingsWithCallback(String name);
}

It seems that getGreetings(...) goes to the async path in my debugging.

Please help me understand here.

Thanks,
Raymond



----- Original Message ----- 
From: "Ignacio Silva-Lepe" <[EMAIL PROTECTED]>

To: "Tuscany Dev" <[email protected]>
Sent: Friday, September 29, 2006 2:08 PM
Subject: NoClassDefFoundError, apparently in Axis2



I am trying to run the hellowordwsclient sample by changing the bound 
reference to use an interface.java, with which it runs ok. But if I then 
add a callbackInterface I get the error below.
By using a callbackInterface, an Axis2AsyncTargetInvoker is chosen that 
calls Axis2's operationClient.execute(false), i.e. non-blocking. Without 
the callbackInterface an Axis2TargetInvoker is chosen which calls 
operationClient.execute(true). So it seems as if trying to using a 
non-blocking operation client execute triggers the error.
I have to wonder whether this may be an Axis2 dependency that has not 
been set up.

Any ideas?

-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running helloworld.HelloWorldWSClientTestCase

log4j:WARN No appenders could be found for logger 
(org.apache.axiom.om.util.StAX

Utils).
log4j:WARN Please initialize the log4j system properly.

org.apache.tuscany.spi.wire.InvocationRuntimeException: 
java.lang.NoClassDefFoun

dError: edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue

       at 
org.apache.tuscany.core.databinding.impl.DataBindingInteceptor.invoke

(DataBindingInteceptor.java:76)

       at 
org.apache.tuscany.core.wire.BridgingInterceptor.invoke(BridgingInter

ceptor.java:41)

       at 
org.apache.tuscany.core.databinding.impl.DataBindingInteceptor.invoke

(DataBindingInteceptor.java:71)

       at 
org.apache.tuscany.core.wire.AbstractOutboundInvocationHandler.invoke

(AbstractOutboundInvocationHandler.java:65)

       at 
org.apache.tuscany.core.wire.jdk.JDKOutboundInvocationHandler.invoke(

JDKOutboundInvocationHandler.java:121)
       at $Proxy20.getGreetings(Unknown Source)

       at 
helloworld.HelloWorldServiceComponent.getGreetings(HelloWorldServiceC

omponent.java:39)

       at 
helloworld.HelloWorldWSClientTestCase.testWSClient(HelloWorldWSClient

TestCase.java:43)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

       at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.

java:39)

       at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces

sorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:585)
       at junit.framework.TestCase.runTest(TestCase.java:154)
       at junit.framework.TestCase.runBare(TestCase.java:127)
       at junit.framework.TestResult$1.protect(TestResult.java:106)
       at junit.framework.TestResult.runProtected(TestResult.java:124)
       at junit.framework.TestResult.run(TestResult.java:109)
       at junit.framework.TestCase.run(TestCase.java:118)
       at junit.framework.TestSuite.runTest(TestSuite.java:208)
       at junit.framework.TestSuite.run(TestSuite.java:203)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

       at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.

java:39)

       at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces

sorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:585)

       at 
org.apache.maven.surefire.junit.JUnitTestSet.execute(JUnitTestSet.jav

a:210)

       at 
org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTes

tSet(AbstractDirectoryTestSuite.java:135)

       at 
org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(Ab

stractDirectoryTestSuite.java:122)
       at org.apache.maven.surefire.Surefire.run(Surefire.java:129)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

       at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.

java:39)

       at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces

sorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:585)

       at 
org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(Su

refireBooter.java:269)

       at 
org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.j

ava:788)

Caused by: java.lang.NoClassDefFoundError: 
edu/emory/mathcs/backport/java/util/c

oncurrent/BlockingQueue

       at 
org.apache.axis2.context.ConfigurationContext.getThreadPool(Configura

tionContext.java:296)

       at 
org.apache.axis2.description.OutInAxisOperationClient.execute(OutInAx

isOperation.java:306)

       at 
org.apache.tuscany.binding.axis2.Axis2AsyncTargetInvoker.invokeTarget

(Axis2AsyncTargetInvoker.java:58)

       at 
org.apache.tuscany.binding.axis2.Axis2AsyncTargetInvoker.invoke(Axis2

AsyncTargetInvoker.java:70)

       at 
org.apache.tuscany.core.wire.InvokerInterceptor.invoke(InvokerInterce

ptor.java:44)

       at 
org.apache.tuscany.core.databinding.impl.DataBindingInteceptor.invoke

(DataBindingInteceptor.java:71)
       ... 33 more

Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 3.032 sec 
<<< FA

ILURE!

Results :

Tests in error:
 testWSClient(helloworld.HelloWorldWSClientTestCase)

Tests run: 1, Failures: 0, Errors: 1, Skipped: 0

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