Unable to create a gson object in a test class in AEM 6.4

[#1]

In AEM 6.4 ,  I am creating a gson object in a Junit Test class and when i am trying to execute the same i am getting java NoClassDefFoundError .

Though I can successfully create a gson object in a normal java class.

Please find the Failure error stack below:

java.lang.NoClassDefFoundError: com/google/gson/internal/bind/JsonTreeWriter

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Unknown Source)

at javassist.runtime.Desc.getClassObject(Desc.java:43)

at javassist.runtime.Desc.getClassType(Desc.java:152)

at javassist.runtime.Desc.getType(Desc.java:122)

at javassist.runtime.Desc.getType(Desc.java:78)

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.internal.runners.MethodRoadie.runBefores(MethodRoadie.java:133)

at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:96)

at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:310)

at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:131)

at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.access$100(PowerMockJUnit47RunnerDelegateImpl.java:59)

at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner$TestExecutorStatement.evaluate(PowerMockJUnit47RunnerDelegateImpl.java:147)

at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.evaluateStatement(PowerMockJUnit47RunnerDelegateImpl.java:107)

at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82)

at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:298)

at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:87)

at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:50)

at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:218)

at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:160)

at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:134)

at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)

at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)

at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:136)

at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:121)

at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:57)

at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59)

at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)

at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

Caused by: java.lang.ClassNotFoundException: com.google.gson.internal.bind.JsonTreeWriter

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:202)

at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass1(DeferSupportingClassLoader.java:89)

at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:79)

at java.lang.ClassLoader.loadClass(Unknown Source)

... 37 more

[#2]

Hi @tanikaa71652610 , 

I believe this issue should have resolved by now. I did faced the similar issue now. So posting the solution as it might be useful for someone else in future. 

Though the dependencies are resolved for implementation class and we are successfully able to use gson feature,  above error occurs when we try to test using the junit. 

Solution:

Adding the gson dependency will fix the issue. 

<dependency>  <groupId>com.google.code.gson<grouoId>

<artifactId>gson</artifactId>

<version>2.8.0</version>

</dependency>