Re: [powermock] PowerMock not working with JAXB

[Johan Haleby]

Hi, 

Hmm what rule implementation are you using? If you're using a the classloader approach try switching to the Javagent. 

Regards,

/Johan

On Sun, Jun 10, 2012 at 3:29 PM, Markus Karg <mar...@headcrashing.eu> wrote:

It seems PowerMock ist not working with JAXB, or I am doing something completely wrong! When running this example code, the below exception is thrown by JAXB. Can anybody tell a PowerMock novice like me what my fault is? (Dependencies found at the end of this posting)

 

@PrepareForTest(X.class) public final class PowermockTest {
  @XmlRootElement public static final class X {
    private X() {  }
  }

  @Rule public PowerMockRule USE_POWER_MOCK = new PowerMockRule();

  @Test public final void x() {
    final X x = PowerMock.createMock(X.class);

    JAXB.marshal(x, System.out);
  }
}

 

javax.xml.bind.DataBindingException: javax.xml.bind.JAXBException
 - with linked exception:
[com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions
net.sf.cglib.proxy.Callback is an interface, and JAXB can't handle interfaces.
 this problem is related to the following location:
  at net.sf.cglib.proxy.Callback
  at public net.sf.cglib.proxy.Callback[] foo.bar.PowermockTest$X$$EnhancerByCGLIB$$f0189e84.getCallbacks()
  at foo.bar.PowermockTest$X$$EnhancerByCGLIB$$f0189e84
net.sf.cglib.proxy.Callback does not have a no-arg default constructor.
 this problem is related to the following location:
  at net.sf.cglib.proxy.Callback
  at public net.sf.cglib.proxy.Callback[] foo.bar.PowermockTest$X$$EnhancerByCGLIB$$f0189e84.getCallbacks()
  at foo.bar.PowermockTest$X$$EnhancerByCGLIB$$f0189e84
]
 at javax.xml.bind.JAXB._marshal(Unknown Source)
 at javax.xml.bind.JAXB.marshal(Unknown Source)
 at foo.bar.PowermockTest.x(PowermockTest.java:28)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
 at org.powermock.modules.junit4.rule.PowerMockStatement$1.run(PowerMockRule.java:52)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.powermock.reflect.internal.WhiteboxImpl.performMethodInvocation(WhiteboxImpl.java:2014)
 at org.powermock.reflect.internal.WhiteboxImpl.doInvokeMethod(WhiteboxImpl.java:885)
 at org.powermock.reflect.internal.WhiteboxImpl.invokeMethod(WhiteboxImpl.java:713)
 at org.powermock.reflect.Whitebox.invokeMethod(Whitebox.java:401)
 at org.powermock.classloading.ClassloaderExecutor.execute(ClassloaderExecutor.java:98)
 at org.powermock.classloading.ClassloaderExecutor.execute(ClassloaderExecutor.java:78)
 at org.powermock.modules.junit4.rule.PowerMockStatement.evaluate(PowerMockRule.java:49)
 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
 at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
 at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: javax.xml.bind.JAXBException
 - with linked exception:
[com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions
net.sf.cglib.proxy.Callback is an interface, and JAXB can't handle interfaces.
 this problem is related to the following location:
  at net.sf.cglib.proxy.Callback
  at public net.sf.cglib.proxy.Callback[] foo.bar.PowermockTest$X$$EnhancerByCGLIB$$f0189e84.getCallbacks()
  at foo.bar.PowermockTest$X$$EnhancerByCGLIB$$f0189e84
net.sf.cglib.proxy.Callback does not have a no-arg default constructor.
 this problem is related to the following location:
  at net.sf.cglib.proxy.Callback
  at public net.sf.cglib.proxy.Callback[] foo.bar.PowermockTest$X$$EnhancerByCGLIB$$f0189e84.getCallbacks()
  at foo.bar.PowermockTest$X$$EnhancerByCGLIB$$f0189e84
]
 at javax.xml.bind.ContextFinder.newInstance(Unknown Source)
 at javax.xml.bind.ContextFinder.newInstance(Unknown Source)
 at javax.xml.bind.ContextFinder.find(Unknown Source)
 at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
 at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
 at javax.xml.bind.JAXB$Cache.<init>(Unknown Source)
 at javax.xml.bind.JAXB.getContext(Unknown Source)
 ... 38 more
Caused by: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions
net.sf.cglib.proxy.Callback is an interface, and JAXB can't handle interfaces.
 this problem is related to the following location:
  at net.sf.cglib.proxy.Callback
  at public net.sf.cglib.proxy.Callback[] foo.bar.PowermockTest$X$$EnhancerByCGLIB$$f0189e84.getCallbacks()
  at foo.bar.PowermockTest$X$$EnhancerByCGLIB$$f0189e84
net.sf.cglib.proxy.Callback does not have a no-arg default constructor.
 this problem is related to the following location:
  at net.sf.cglib.proxy.Callback
  at public net.sf.cglib.proxy.Callback[] foo.bar.PowermockTest$X$$EnhancerByCGLIB$$f0189e84.getCallbacks()
  at foo.bar.PowermockTest$X$$EnhancerByCGLIB$$f0189e84

 at com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException$Builder.check(Unknown Source)
 at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(Unknown Source)
 at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(Unknown Source)
 at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(Unknown Source)
 at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(Unknown Source)
 at com.sun.xml.internal.bind.v2.ContextFactory.createContext(Unknown Source)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 ... 45 more

 

 

Here is the POM snippet so you see what versions are used:

<dependency> 
  <groupId>junit</groupId>
  <artifactId>junit</artifactId> 

  <version>4.10</version> 
  <scope>test</scope> 
</dependency>
<dependency> 
  <groupId>org.hamcrest</groupId> 

  <artifactId>hamcrest-core</artifactId> 
  <version>1.2.1</version> 
  <scope>test</scope> 
</dependency> 
<dependency> 
  <groupId>org.xmlmatchers</groupId> 
  <artifactId>xml-matchers</artifactId> 
  <version>0.10</version> 
  <scope>test</scope> 
</dependency> 
<dependency> 
  <groupId>org.easymock</groupId> 
  <artifactId>easymock</artifactId> 
  <version>3.1</version> 
  <scope>test</scope> 
</dependency> 
<dependency> 
  <groupId>org.powermock</groupId> 
  <artifactId>powermock-module-junit4-rule</artifactId> 
  <version>1.4.12</version> 
  <scope>test</scope> 
</dependency> 
<dependency> 
  <groupId>org.powermock</groupId> 
  <artifactId>powermock-api-easymock</artifactId> 
  <version>1.4.12</version> 
  <scope>test</scope> 
</dependency> 
<dependency> 
  <groupId>org.powermock</groupId> 
  <artifactId>powermock-classloading-xstream</artifactId> 
  <version>1.4.12</version> 
  <scope>test</scope> 
</dependency>

 

Thanks in advance!

Markus

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[Markus Karg]

As you suggested I switched to the agent approach, but this will not load itself...:

java.util.ServiceConfigurationError: com.sun.tools.attach.spi.AttachProvider: Provider sun.tools.attach.WindowsAttachProvider could not be instantiated: java.lang.UnsatisfiedLinkError: no attach in java.library.path

java.lang.IllegalStateException: Unable to load Java agent; please add lib/tools.jar from your JDK to the classpath

at org.powermock.modules.agent.JDK6AgentLoader.getVirtualMachineImplementationFromEmbeddedOnes(JDK6AgentLoader.java:97)

 

I think the problem with the agent is that I have solely JDK7 on my machine, while the stacktrace says PowerMock tries to load something developed for JDK6?

[Johan Haleby]

Hmm you may be right. You could try eager loading the agent instead.

/Johan

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[Markus Karg]

Eager loading solved the Java 7 issues, but brought me back to my original problem (I'm starting to drive nuts)...:

 

javax.xml.bind.DataBindingException: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 3 counts of IllegalAnnotationExceptions
net.java.dev.webdav.jaxrs.xml.properties.PowermockTest$X$EnhancerByCGLIB$95116475 does not have a no-arg default constructor.

this problem is related to the following location:

at net.java.dev.webdav.jaxrs.xml.properties.PowermockTest$X$EnhancerByCGLIB$95116475

net.sf.cglib.proxy.Callback is an interface, and JAXB can't handle interfaces.
this problem is related to the following location:
at net.sf.cglib.proxy.Callback

at public net.sf.cglib.proxy.Callback[] net.java.dev.webdav.jaxrs.xml.properties.PowermockTest$X$EnhancerByCGLIB$95116475.getCallbacks()
at net.java.dev.webdav.jaxrs.xml.properties.PowermockTest$X$EnhancerByCGLIB$95116475

net.sf.cglib.proxy.Callback does not have a no-arg default constructor.
this problem is related to the following location:
at net.sf.cglib.proxy.Callback

at public net.sf.cglib.proxy.Callback[] net.java.dev.webdav.jaxrs.xml.properties.PowermockTest$X$EnhancerByCGLIB$95116475.getCallbacks()
at net.java.dev.webdav.jaxrs.xml.properties.PowermockTest$X$EnhancerByCGLIB$95116475

at javax.xml.bind.JAXB._marshal(Unknown Source)
at javax.xml.bind.JAXB.marshal(Unknown Source)

at net.java.dev.webdav.jaxrs.xml.properties.PowermockTest.x(PowermockTest.java:33)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)

at org.powermock.modules.junit4.rule.PowerMockStatement.evaluate(PowerMockRule.java:49)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)

at org.junit.runners.ParentRunner.access0(ParentRunner.java:50)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Caused by: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 3 counts of IllegalAnnotationExceptions
net.java.dev.webdav.jaxrs.xml.properties.PowermockTest$X$EnhancerByCGLIB$95116475 does not have a no-arg default constructor.

this problem is related to the following location:

at net.java.dev.webdav.jaxrs.xml.properties.PowermockTest$X$EnhancerByCGLIB$95116475

net.sf.cglib.proxy.Callback is an interface, and JAXB can't handle interfaces.
this problem is related to the following location:
at net.sf.cglib.proxy.Callback

at public net.sf.cglib.proxy.Callback[] net.java.dev.webdav.jaxrs.xml.properties.PowermockTest$X$EnhancerByCGLIB$95116475.getCallbacks()
at net.java.dev.webdav.jaxrs.xml.properties.PowermockTest$X$EnhancerByCGLIB$95116475

net.sf.cglib.proxy.Callback does not have a no-arg default constructor.
this problem is related to the following location:
at net.sf.cglib.proxy.Callback

at public net.sf.cglib.proxy.Callback[] net.java.dev.webdav.jaxrs.xml.properties.PowermockTest$X$EnhancerByCGLIB$95116475.getCallbacks()
at net.java.dev.webdav.jaxrs.xml.properties.PowermockTest$X$EnhancerByCGLIB$95116475

at com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException$Builder.check(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(Unknown Source)
at com.sun.xml.internal.bind.v2.ContextFactory.createContext(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)

at javax.xml.bind.ContextFinder.newInstance(Unknown Source)
at javax.xml.bind.ContextFinder.newInstance(Unknown Source)
at javax.xml.bind.ContextFinder.find(Unknown Source)
at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
at javax.xml.bind.JAXB$Cache.<init>(Unknown Source)
at javax.xml.bind.JAXB.getContext(Unknown Source)

... 27 more

[Johan Haleby]

Sorry to hear that but perhaps there's something else that's wrong. A quick search on google got me here for example: http://jersey.576304.n2.nabble.com/Error-marshalling-out-JAXB-object-of-type-quot-class-gov-hhs-acf-util-ws-grants-model-GrantsDTO-quot-td4683828.html. Are you trying to mock the DTO objects?

Regards,

/Johan

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[Markus KARG]

Indeed I mock the DTOs, but the problem in the link you provided is different -- that guy actually did not mock anything but simply forgot add a constructor. I do have a constructor, but the mock provided by Powermock does not. THAT is my problem. See, my original DTO works well with JAXB. Just the mock does not.

[Johan Haleby]

Alright I see. Do you really need to mock the class? Perhaps it would be alright to just stub the method to always return the same value using the stubbing API:

stub(method(PowerMockTest.class, "myMethodName")).toReturn(..);

If I remember it correctly this approach will not create a CgLib proxy but rather modify the byte-code of "PowerMockTest" directly.

Regards,

/Johan

[Markus KARG]

Yes, I need to mock the class, as the purpose is to provide an instance of the mock to the class under test as a parameter. If I cannot mock the class, I have to create an instance, which is a problem as ist constructor want more (non-mockable) DTOs then and so on. The target is to cut dependencies between classes, which is no possible by simply stubbing methods.

[Johan Haleby]

Hmm if the problem is the constructor you could suppress the constructor: 

suppress(constructor(X.class));

Regards,

/Johan

[Markus KARG]

I am not familiar to "suppres". But how does this help me? I need an instance of X.class, how to get it if the constructor is suppressed?

[Markus KARG]

Yes! Got it! IT WORKS! IT WORKS! HAPPY! :-)

 

suppress(constructor(X.class));

final X x = Whitebox.newInstance(X.class);

JAXB.marshal(new Y(x), System.out);

 

Thank you so much for your tip. This indeed is a great solution! I love PowerMock!

 

Regards

Markus

 

From: Markus KARG [mailto:mar...@headcrashing.eu]
Sent: Donnerstag, 21. Juni 2012 20:02
To: 'powe...@googlegroups.com'
Subject: RE: [powermock] PowerMock not working with JAXB

 

I am not familiar to "suppres". But how does this help me? I need an instance of X.class, how to get it if the constructor is suppressed?

 

From: powe...@googlegroups.com [mailto:powe...@googlegroups.com] On Behalf Of Johan Haleby

Sent: Donnerstag, 21. Juni 2012 07:53

[Johan Haleby]

Glad you got it working and thanks for your patience.

Actually in the example you give "suppress(constructor(X.class));" is not needed. Whitebox.newInstance(..) creates a new instance of a class without invoking any constructor at all and it doesn't even require byte-code manipulation (so no need for @PrepareForTest). 

Regards,

/Johan

[Markus KARG]

I see. But in what scenario is suppression of the constructor needed then?

[Johan Haleby]

For example if you want to suppress the constructor for all new instances of the class, not just one. 

/Johan