Powermock - java.lang.IllegalStateException: Failed to transform class

java junit mockito powermock
Lucky1989 picture Lucky1989 · Sep 30, 2015 · Viewed 53.4k times · Source

Description:

I am trying to test a static method from a class. I am using powerMock (1.6.2) + mockito (1.10.19) for mocking along with Junit4 (4.12) & java8.

Issue:

Getting the error: "Failed to transform class with name com.gs.ops.domain.StaticClass Reason: java.io.IOException: invalid constant type: 18"

Solutions Tried:

  1. Googled threads for issue on with powermock - mockito & java-8

  2. Excluded java assist from powermock and added java assist 3.19.0-GA

  3. Tried different versions of powermock (1.5.4, 1.6.2...)

Below is the exception stack trace:

 java.lang.IllegalStateException: Failed to transform class with name com.StaticClass. Reason: java.io.IOException: invalid constant type: 18
        at org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java:266)
        at org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:180)
        at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:68)
        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:145)
        at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:40)
        at org.powermock.tests.utils.impl.AbstractTestSuiteChunkerImpl.createTestDelegators(AbstractTestSuiteChunkerImpl.java:244)
        at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.<init>(JUnit4TestSuiteChunkerImpl.java:61)
        at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.<init>(AbstractCommonPowerMockRunner.java:32)
        at org.powermock.modules.junit4.PowerMockRunner.<init>(PowerMockRunner.java:34)
        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:104)
        at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:86)
        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:33)
        at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67)
    Caused by: java.lang.RuntimeException: java.io.IOException: invalid constant type: 18
        at javassist.CtClassType.getClassFile2(CtClassType.java:203)
        at javassist.compiler.MemberResolver.lookupMethod(MemberResolver.java:110)
        at javassist.compiler.MemberResolver.lookupMethod(MemberResolver.java:96)
        at javassist.compiler.TypeChecker.atMethodCallCore(TypeChecker.java:704)
        at javassist.expr.NewExpr$ProceedForNew.setReturnType(NewExpr.java:243)
        at javassist.compiler.JvstTypeChecker.atCallExpr(JvstTypeChecker.java:146)
        at javassist.compiler.ast.CallExpr.accept(CallExpr.java:45)
        at javassist.compiler.TypeChecker.atVariableAssign(TypeChecker.java:248)
        at javassist.compiler.TypeChecker.atAssignExpr(TypeChecker.java:217)
        at javassist.compiler.ast.AssignExpr.accept(AssignExpr.java:38)
        at javassist.compiler.CodeGen.doTypeCheck(CodeGen.java:241)
        at javassist.compiler.CodeGen.atStmnt(CodeGen.java:329)
        at javassist.compiler.ast.Stmnt.accept(Stmnt.java:49)
        at javassist.compiler.CodeGen.atStmnt(CodeGen.java:350)
        at javassist.compiler.ast.Stmnt.accept(Stmnt.java:49)
        at javassist.compiler.CodeGen.atIfStmnt(CodeGen.java:404)
        at javassist.compiler.CodeGen.atStmnt(CodeGen.java:354)
        at javassist.compiler.ast.Stmnt.accept(Stmnt.java:49)
        at javassist.compiler.Javac.compileStmnt(Javac.java:568)
        at javassist.expr.NewExpr.replace(NewExpr.java:206)
        at org.powermock.core.transformers.impl.MainMockTransformer$PowerMockExpressionEditor.edit(MainMockTransformer.java:418)
        at javassist.expr.ExprEditor.loopBody(ExprEditor.java:211)
        at javassist.expr.ExprEditor.doit(ExprEditor.java:90)
        at javassist.CtClassType.instrument(CtClassType.java:1374)
        at org.powermock.core.transformers.impl.MainMockTransformer.transform(MainMockTransformer.java:74)
        at org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java:251)
        ... 24 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)
        ... 49 more

Pom file: 

<dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-api-mockito</artifactId>
            <version>1.6.2</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-module-junit4</artifactId>
            <version>1.6.2</version>
            <exclusions>
                <exclusion>
                    <groupId>org.junit</groupId>
                    <artifactId>junit</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.powermock</groupId>
                    <artifactId>powermock-core</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.powermock</groupId>
                    <artifactId>powermock-reflect</artifactId>
                </exclusion>
            </exclusions>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.19.0-GA</version>
        </dependency>

Answer

JDev picture JDev · Oct 16, 2015

Powermock 1.6.3 uses javassist 3.15.2-GA which does not support certain types. Using 3.18.2-GA javassist worked for me. You may want to override dependency in your project. 

    <dependency>
        <groupId>org.javassist</groupId>
        <artifactId>javassist</artifactId>
        <version>3.18.2-GA</version>
    </dependency>

You may face another problem for which the solution lies here Mockito + PowerMock LinkageError while mocking system class

Hope this helps.

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