Exception when running WebModuleUtilTest under Java 8

The initializationError test in the WebModuleUtilTest class throws an exception when running under Java 8.

<error message="Failed to transform class with name org.openmrs.module.web.WebModuleUtilTest. Reason: java.io.IOException: invalid constant type: 18" type="java.lang.IllegalStateException">java.lang.IllegalStateException: Failed to transform class with name org.openmrs.module.web.WebModuleUtilTest. Reason: java.io.IOException: invalid constant type: 18
at org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java:219)
at org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:147)
at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:67)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:340)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:132)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:39)
at org.powermock.tests.utils.impl.AbstractTestSuiteChunkerImpl.createTestDelegators(AbstractTestSuiteChunkerImpl.java:217)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.<init>(JUnit4TestSuiteChunkerImpl.java:59)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.<init>(AbstractCommonPowerMockRunner.java:32)
at org.powermock.modules.junit4.PowerMockRunner.<init>(PowerMockRunner.java:33)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:29)
at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:21)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:26)
at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:51)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:115)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:102)
at org.apache.maven.surefire.Surefire.run(Surefire.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:350)
at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1021)
Caused by: java.lang.RuntimeException: java.io.IOException: invalid constant type: 18
at javassist.CtClassType.getClassFile2(CtClassType.java:203)
at javassist.CtClassType.subtypeOf(CtClassType.java:303)
at javassist.bytecode.stackmap.TypeData$TypeName.update(TypeData.java:274)
at javassist.bytecode.stackmap.TypeData$TypeName.setType(TypeData.java:203)
at javassist.bytecode.stackmap.TypeData.setType(TypeData.java:46)
at javassist.bytecode.stackmap.Tracer.checkParamTypes(Tracer.java:913)
at javassist.bytecode.stackmap.Tracer.doInvokeMethod(Tracer.java:818)
at javassist.bytecode.stackmap.Tracer.doOpcode148_201(Tracer.java:615)
at javassist.bytecode.stackmap.Tracer.doOpcode(Tracer.java:101)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:182)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:192)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:141)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:96)
at javassist.bytecode.MethodInfo.rebuildStackMap(MethodInfo.java:416)
at javassist.bytecode.MethodInfo.rebuildStackMapIf6(MethodInfo.java:398)
at javassist.expr.ExprEditor.doit(ExprEditor.java:112)
at javassist.CtClassType.instrument(CtClassType.java:1374)
at org.powermock.core.transformers.impl.MainMockTransformer.transform(MainMockTransformer.java:75)
at org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java:215)
... 31 more
Caused by: java.io.IOException: invalid constant type: 18
at javassist.bytecode.ConstPool.readOne(ConstPool.java:1090)
at javassist.bytecode.ConstPool.read(ConstPool.java:1033)
at javassist.bytecode.ConstPool.<init>(ConstPool.java:149)
at javassist.bytecode.ClassFile.read(ClassFile.java:737)
at javassist.bytecode.ClassFile.<init>(ClassFile.java:108)
at javassist.CtClassType.getClassFile2(CtClassType.java:190)
... 83 more
</error>