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


description:

i trying test static method class. using powermock (1.6.2) + mockito (1.10.19) mocking along junit4 (4.12) & java8.

issue:

getting error: "failed transform class name com.gs.ops.domain.staticclass reason: java.io.ioexception: invalid constant type: 18"

solutions tried:

  1. googled threads issue on powermock - mockito & java-8

  2. excluded java assist powermock , added java assist 3.19.0-ga

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

below exception stack trace:

 java.lang.illegalstateexception: failed transform class name com.staticclass. reason: java.io.ioexception: invalid constant type: 18         @ org.powermock.core.classloader.mockclassloader.loadmockclass(mockclassloader.java:266)         @ org.powermock.core.classloader.mockclassloader.loadmodifiedclass(mockclassloader.java:180)         @ org.powermock.core.classloader.defersupportingclassloader.loadclass(defersupportingclassloader.java:68)         @ java.lang.classloader.loadclass(classloader.java:357)         @ java.lang.class.forname0(native method)         @ java.lang.class.forname(class.java:340)         @ org.powermock.modules.junit4.common.internal.impl.junit4testsuitechunkerimpl.createdelegatorfromclassloader(junit4testsuitechunkerimpl.java:145)         @ org.powermock.modules.junit4.common.internal.impl.junit4testsuitechunkerimpl.createdelegatorfromclassloader(junit4testsuitechunkerimpl.java:40)         @ org.powermock.tests.utils.impl.abstracttestsuitechunkerimpl.createtestdelegators(abstracttestsuitechunkerimpl.java:244)         @ org.powermock.modules.junit4.common.internal.impl.junit4testsuitechunkerimpl.<init>(junit4testsuitechunkerimpl.java:61)         @ org.powermock.modules.junit4.common.internal.impl.abstractcommonpowermockrunner.<init>(abstractcommonpowermockrunner.java:32)         @ org.powermock.modules.junit4.powermockrunner.<init>(powermockrunner.java:34)         @ sun.reflect.nativeconstructoraccessorimpl.newinstance0(native method)         @ sun.reflect.nativeconstructoraccessorimpl.newinstance(nativeconstructoraccessorimpl.java:62)         @ sun.reflect.delegatingconstructoraccessorimpl.newinstance(delegatingconstructoraccessorimpl.java:45)         @ java.lang.reflect.constructor.newinstance(constructor.java:408)         @ org.junit.internal.builders.annotatedbuilder.buildrunner(annotatedbuilder.java:104)         @ org.junit.internal.builders.annotatedbuilder.runnerforclass(annotatedbuilder.java:86)         @ org.junit.runners.model.runnerbuilder.saferunnerforclass(runnerbuilder.java:59)         @ org.junit.internal.builders.alldefaultpossibilitiesbuilder.runnerforclass(alldefaultpossibilitiesbuilder.java:26)         @ org.junit.runners.model.runnerbuilder.saferunnerforclass(runnerbuilder.java:59)         @ org.junit.internal.requests.classrequest.getrunner(classrequest.java:33)         @ com.intellij.rt.execution.junit.junitstarter.main(junitstarter.java:67)     caused by: java.lang.runtimeexception: java.io.ioexception: invalid constant type: 18         @ javassist.ctclasstype.getclassfile2(ctclasstype.java:203)         @ javassist.compiler.memberresolver.lookupmethod(memberresolver.java:110)         @ javassist.compiler.memberresolver.lookupmethod(memberresolver.java:96)         @ javassist.compiler.typechecker.atmethodcallcore(typechecker.java:704)         @ javassist.expr.newexpr$proceedfornew.setreturntype(newexpr.java:243)         @ javassist.compiler.jvsttypechecker.atcallexpr(jvsttypechecker.java:146)         @ javassist.compiler.ast.callexpr.accept(callexpr.java:45)         @ javassist.compiler.typechecker.atvariableassign(typechecker.java:248)         @ javassist.compiler.typechecker.atassignexpr(typechecker.java:217)         @ javassist.compiler.ast.assignexpr.accept(assignexpr.java:38)         @ javassist.compiler.codegen.dotypecheck(codegen.java:241)         @ javassist.compiler.codegen.atstmnt(codegen.java:329)         @ javassist.compiler.ast.stmnt.accept(stmnt.java:49)         @ javassist.compiler.codegen.atstmnt(codegen.java:350)         @ javassist.compiler.ast.stmnt.accept(stmnt.java:49)         @ javassist.compiler.codegen.atifstmnt(codegen.java:404)         @ javassist.compiler.codegen.atstmnt(codegen.java:354)         @ javassist.compiler.ast.stmnt.accept(stmnt.java:49)         @ javassist.compiler.javac.compilestmnt(javac.java:568)         @ javassist.expr.newexpr.replace(newexpr.java:206)         @ org.powermock.core.transformers.impl.mainmocktransformer$powermockexpressioneditor.edit(mainmocktransformer.java:418)         @ javassist.expr.expreditor.loopbody(expreditor.java:211)         @ javassist.expr.expreditor.doit(expreditor.java:90)         @ javassist.ctclasstype.instrument(ctclasstype.java:1374)         @ org.powermock.core.transformers.impl.mainmocktransformer.transform(mainmocktransformer.java:74)         @ org.powermock.core.classloader.mockclassloader.loadmockclass(mockclassloader.java:251)         ... 24 more     caused by: java.io.ioexception: invalid constant type: 18         @ javassist.bytecode.constpool.readone(constpool.java:1090)         @ javassist.bytecode.constpool.read(constpool.java:1033)         @ javassist.bytecode.constpool.<init>(constpool.java:149)         @ javassist.bytecode.classfile.read(classfile.java:737)         @ javassist.bytecode.classfile.<init>(classfile.java:108)         @ 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>

powermock 1.6.3 uses javassist 3.15.2-ga not support types. using 3.18.2-ga javassist worked me. may want override dependency in project. 

    <dependency>         <groupid>org.javassist</groupid>         <artifactid>javassist</artifactid>         <version>3.18.2-ga</version>     </dependency>

you may face problem solution lies here mockito + powermock linkageerror while mocking system class

hope helps.


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