Why do I get a Illegal Access Error when running my Android tests?

Question

I get the following stack trace when running my Android tests on the Emulator:

java.lang.NoClassDefFoundError: client.HttpHelper
at client.Helper.<init>(Helper.java:14)  
at test.Tests.setUp(Tests.java:15)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:164)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:151)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:425)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1520)
Caused by: java.lang.IllegalAccessError: cross-loader access from pre-verified class
at dalvik.system.DexFile.defineClass(Native Method)
at dalvik.system.DexFile.loadClass(DexFile.java:193)  
at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:203)
at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
... 11 more

I run my tests from an extra project. And it seems there are some problems with loading the classes from the other project. I have run the tests before but now they are failing. The project under tests runs without problems.

Line 14 of the Helper Class is:

this.httpHelper = new HttpHelper(userProfile);

I start a HttpHelper class that is responsible for executing httpqueries. I think somehow this helper class is not available anymore, but I have no clue why.

Answer 1

Are you using external libraries in your project ? If this is the case the instruction on this article may help you.