adding 'emma' to Android ant build triggers "local variable type mismatch" exception

Question

I am trying to run Emma on the tests for an Android project that is a combination of Java and C/JNI code. The build and tests work fine, but whenever I add emma, I get a mysterious exception. I'm using the Android SDK v20.1 and NDK r8b.

The project is here, its an Android library project: https://github.com/guardianproject/IOCipher and the tests are here: https://github.com/guardianproject/IOCipherTests

The build.xml file is generated using android update test-project. Running ant clean debug install test works everytime while ant clean emma debug install test triggers the exception:

here's the exception:

-dex:
      [dex] Converting compiled files and external libraries into /var/lib/jenkins/workspace/IOCipherTests/IOCipherTests/bin/classes.dex...
       [dx] 
       [dx] EXCEPTION FROM SIMULATION:
       [dx] local variable type mismatch: attempt to set or access a value of type int using a local variable of type info.guardianproject.libcore.io.ErrnoException. This is symptomatic of .class transformation tools that ignore local variable information.
       [dx] 
       [dx] ...at bytecode offset 0000002e
       [dx] locals[0000]: Linfo/guardianproject/iocipher/File;
       [dx] locals[0001]: Linfo/guardianproject/iocipher/FileDescriptor;
       [dx] locals[0002]: <invalid>
       [dx] locals[0003]: <invalid>
       [dx] locals[0004]: <invalid>
       [dx] locals[0005]: [Z
       [dx] stack[top0]: int{0x00000001 / 1}
       [dx] ...while working on block 002c
       [dx] ...while working on method createNewFile:()Z
       [dx] ...while processing createNewFile ()Z
       [dx] ...while processing info/guardianproject/iocipher/File.class
       [dx] 
       [dx] 1 error; aborting
BUILD FAILED
/opt/android-sdk/tools/ant/build.xml:850: The following error occurred while executing this line:
/opt/android-sdk/tools/ant/build.xml:852: The following error occurred while executing this line:
/opt/android-sdk/tools/ant/build.xml:864: The following error occurred while executing this line:
/opt/android-sdk/tools/ant/build.xml:266: null returned: 1

Answer 1

I was getting the same error. In my project we had a unit test app in one project, which wrapped another project containing the unit tests themselves. Both projects held references to my SDK which, as chaitanya suggested, was causing emma to instrument the SDK code twice. By removing the reference to the SDK in the unit test project I was able to resolve the error.