JUNIT instrumentation test failing in android studio

Question

AGPBI: {"kind":"error","text":"indicate that it is not an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"PARSE ERROR:","sources":[{}]} AGPBI: {"kind":"error","text":"unsupported class file version 52.0","sources":[{}]} AGPBI: {"kind":"error","text":"...while parsing com/thoughtworks/xstream/converters/reflection/LambdaConverter.class","sources":[{}]} AGPBI: {"kind":"error","text":"1 error; aborting","sources":[{}]}

:app:transformClassesWithDexForDebug FAILED

FAILURE: Build failed with an exception.

• What went wrong:app:transformClassesWithDexForDebug'.

  com.android.build.api.transform.Tra Execution failed for task ':nsformException: java.lang.RuntimeException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.8.0_101\bin\java.exe'' finished with non-zero exit value 1

Added to gradle file : testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" multiDexEnabled true But didnt help. What am I missing?

Answer 1

Android doesn't support the Java 8 (version 52.0) class file format (and only supports some Java 8 language level features if you are using the 3.0.0-alpha or later android gradle plugin). If you control the module/jar that contains com.thoughtworks.xstream.converters.reflection.LambdaConverter.class, you can recompile it targeting java 7 in order to remove this error.