Re: [mockito] Mockito Serialization Error Using ThenAnswer

[Brice Dutheil]

Hi,

Sorry for the late reply, holiday happened :)

Anyway your problem is Java related, anonymous classes are not serializable, you need to create a class for the answer you want to use and make it implement Serializable.

Hope that helps

Cheers,

-- Brice

On Fri, Dec 21, 2012 at 4:55 PM, <gokce...@gmail.com> wrote:

Hello,

Is there a known limitation for using OngoingStubbing.thenAnswer method for serializable objects? You can see the test case of problem here:

@Test

public void startProcessForAnwser()

{

SerializableClass mockedSerializableClass = mock(SerializableClass.class, withSettings().serializable());

when(mockedSerializableClass.getValue(anyString())).thenAnswer(new Answer<String>()

{

@Override

public String answer(final InvocationOnMock invocation)

{

return "Called with mock";

}

});

try

{

ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(4096);

ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);

objectOutputStream.writeObject(mockedSerializableClass);

objectOutputStream.close();

ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());

ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);

SerializableClass mockedSerializableClass2 = (SerializableClass) objectInputStream.readObject();

assertEquals(mockedSerializableClass, mockedSerializableClass2);

}

catch (IOException | ClassNotFoundException e)

{

e.printStackTrace();

}

}

I get:

java.io.NotSerializableException: SerializationTest$1

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1180)

at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)

at java.util.concurrent.ConcurrentLinkedQueue.writeObject(ConcurrentLinkedQueue.java:766)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:601)

at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)

at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)

at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)

at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)

at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)

at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)

at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)

at java.util.LinkedList.writeObject(LinkedList.java:1118)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:601)

at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)

at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)

at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)

at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)

at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)

at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)

at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)

at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)

at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)

at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)

at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)

at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)

at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)

at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)

at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)

at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)

at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)

at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)

at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)

at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)

at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)

at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)

at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)

at SerializationTest.startProcessForAnwser(SerializationTest.java:42)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:601)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)

at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)

at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)

at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)

at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)

at org.junit.runners.ParentRunner.run(ParentRunner.java:309)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)

at org.junit.runner.JUnitCore.run(JUnitCore.java:160)

at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:76)

at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:195)

at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:63)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:601)

at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

The error points to the line:

ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);

But using same object with this configuration:

@Test

public void startProcessForNull()

{

SerializableClass mockedSerializableClass = mock(SerializableClass.class, withSettings().serializable());

when(mockedSerializableClass.getValue(anyString())).thenReturn(null);

try

{

ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(4096);

ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);

objectOutputStream.writeObject(mockedSerializableClass);

objectOutputStream.close();

ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());

ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);

SerializableClass mockedSerializableClass2 = (SerializableClass) objectInputStream.readObject();

assertEquals(mockedSerializableClass, mockedSerializableClass2);

}

catch (IOException | ClassNotFoundException e)

{

e.printStackTrace();

}

}

I get only assertion error complaining about inequality, I don't expect this too but not a problem for me.

Thanks in advance...

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