I'm trying to use PowerMockito to mock a static class throwing an IOException. I'm using JUnit 4.12 and PowerMockMockito 1.6.3 in my package. However, I get an "initializationError" due to the "#RunWith(PowerMockRunner.class)" annotation I need to put above the class definition. This happens even if the test class is empty.
Here is the stack trace of the error:
org.powermock.reflect.exceptions.FieldNotFoundException: Field 'fTestClass' was not found in class org.junit.internal.runners.MethodValidator.
at org.powermock.reflect.internal.WhiteboxImpl.getInternalState(WhiteboxImpl.java:581)
at org.powermock.reflect.Whitebox.getInternalState(Whitebox.java:308)
at org.powermock.modules.junit4.internal.impl.testcaseworkaround.PowerMockJUnit4MethodValidator.validateTestMethods(PowerMockJUnit4MethodValidator.java:97)
at org.powermock.modules.junit4.internal.impl.testcaseworkaround.PowerMockJUnit4MethodValidator.validateInstanceMethods(PowerMockJUnit4MethodValidator.java:67)
at org.junit.internal.runners.MethodValidator.validateMethodsForDefaultRunner(MethodValidator.java:51)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.validate(PowerMockJUnit44RunnerDelegateImpl.java:108)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.<init>(PowerMockJUnit44RunnerDelegateImpl.java:70)
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:423)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:156)
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:423)
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 org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:33)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:48)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:444)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
My attempts to solve the problem has led me to several older SO questions like this one, where a similar problem was resolved after PowerMockito was updated to 1.6.1. Unfortunately it was not very helpful.
I am new to PowerMockito, so I might be missing something too obvious to be mentioned in any guides. Any ideas on how I can resolve this? Thanks in advance.
If the whole thing is your code, then a not so subtle solution would be:
avoid PowerMock, and this sort of problems completely. Instead accept that static is an abnormality in good OO designs - as it leads to direct, hard coupling of your classes.
So instead of writing hard-to-test code that requires the big Powermock hammer in order to be testable: come up with code that avoids static; and that thus can be tested without the need for Powermock.
Long story short: learn about writing testable code (for example by listening to these [videos][1]). And let the door to the Powermock room closed. And when that static thingy lives in external code that you don't own; you might still put a wrapper around it and avoid the direct dependency.
Edit: of course, it is cumbersome to work around such a central thing as Apache commons, but still, you can always do something like:
class TheStaticThing {
public static Whatever doSomething(Somethin els) throws StupidException { ...
you can forward and "interface" this:
interface TheStaticThingFunctionality {
public static Whatever doSomething(Somethin els) throws StupidException;
Then you have a simple
class TheStaticThingImpl implements TheStaticThingFunctionality {
#Override
public Whatever doSomething(Somethin els) throws StupidException {
return TheStaticThing.doSomething(els);
}
And, now within your client class:
class Client {
private final TheStaticThingFunctionality func;
Client() { this(new TheStaticThingImpl()); }
Client(TheStaticThingFunctionality func) { this.func = func; }
This code allows you:
keep using the existing static methods with minimal overhead
pass mocked instances of TheStaticThingFunctionality into your Client class
And now you can fully control when you exceptions to fly; and more importantly: you already made a first step towards decoupling yourself from the implementation provided by Apachace commons - as you are now free to exchange TheStaticThingImpl with something else if you see a need for that!
Related
I am having an issue using jUnit tests and handling exceptions in Java.
I created my TestClass with both the annotations #RunWith(DevAppServerTestRunner.class) and #DevAppServerTest(TestConfig.class) since I need to test a method that use some properties configured in my appengine-web.xml file.
The problem comes when, after declaring a jUnit #Rule to define an Exception I want to test, I ran the test and got an error saying "The Rule 'myexceptionName' must implement MethodRule or TestRule".
That's pretty strange since the exception I declared is of type ExpectedException, a jUnit class that already implements TestRule.
I suspect this issue has something to do with my #RunWith and #DevAppServerTest annotations because using another class without them, the Rule implementation works(solution I can't use since I need to read some properties from appengine-web.xml).
Did anyone encounter something similar or have a clue on how to deal with this?
#RunWith(DevAppServerTestRunner.class)
#DevAppServerTest(TestConfig.class)
public class myTestClass {
#Rule
public ExpectedException exc = ExpectedException.none();
#Test
public void TestingException() throws Exception {
this.exc.expect(NullPointerException.class);
String test = null;
test.length();
}
}
The example code I wrote here doesn't involve appengine system properties, but it gives this same error:
org.junit.internal.runners.rules.ValidationError: The #Rule 'exc' must implement MethodRule or TestRule.
at org.junit.internal.runners.rules.RuleMemberValidator$FieldMustBeARule.validate(RuleMemberValidator.java:234)
at org.junit.internal.runners.rules.RuleMemberValidator.validateMember(RuleMemberValidator.java:99)
at org.junit.internal.runners.rules.RuleMemberValidator.validate(RuleMemberValidator.java:93)
at org.junit.runners.BlockJUnit4ClassRunner.validateFields(BlockJUnit4ClassRunner.java:196)
at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:129)
at com.google.appengine.tools.development.testing.DevAppServerTestRunner.collectInitializationErrors(DevAppServerTestRunner.java:102)
at org.junit.runners.ParentRunner.validate(ParentRunner.java:416)
at org.junit.runners.ParentRunner.<init>(ParentRunner.java:84)
at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:65)
at com.google.appengine.tools.development.testing.DevAppServerTestRunner.<init>(DevAppServerTestRunner.java:74)
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:423)
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 org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createUnfilteredTest(JUnit4TestLoader.java:90)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:76)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:49)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:525)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)
I am writing my Junit test cases for Groovy using Mockito jar, but it is giving me following exception:
java.lang.NoSuchMethodError: org.mockito.internal.runners.RunnerFactory.createStrict(Ljava/lang/Class;)Lorg/mockito/internal/runners/InternalRunner;
at org.mockito.junit.MockitoJUnitRunner.<init>(MockitoJUnitRunner.java:152)
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:423)
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 org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createUnfilteredTest(JUnit4TestLoader.java:84)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:70)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:43)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:444)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Below is the jar list that I have:
cglib-nodep-2.2.2
javassist-3.19.0-GA
junit-4.12
mockito-all-1.10.19
objenesis-2.5
powermock-mockito-1.6.2-full
Below is my code. I have added necessary imports:
package test.service
import org.junit.Test
import org.junit.runner.RunWith
import org.mockito.InjectMocks
import org.mockito.Mock
import org.mockito.junit.MockitoJUnitRunner
import static org.mockito.Mockito.when;
#RunWith(MockitoJUnitRunner.class)
class SyncImplTest {
#InjectMocks
SyncThreatImpl fixture;
#Mock
RpcConfigurationLoader rpcConfigurationLoader
#Test
public void testRpcConfig(){
RpcApiInfo rpcApiInfo = new RpcApiInfo();
when(rpcConfigurationLoader.loadConfiguration()).thenReturn(rpcApiInfo)
}
}
For some reason, your test suite, tries to load the MockitoJunitRunner from the org.mockito.junit contained in the Mockito versions >= 2. O. In that version, the line:
at org.mockito.junit.MockitoJUnitRunner.<init>(MockitoJUnitRunner.java:152)
is doing this:
public MockitoJUnitRunner(Class<?> klass) throws InvocationTargetException {
//by default, StrictRunner is used. We can change that potentially based on feedback from users
this(new StrictRunner(new RunnerFactory().createStrict(klass), klass));
}
and the RunnerFactory that is loaded here is from version 1.x as createStrict has been introduced in Mockito 2.x.
So go through the pom dependency tree and to find what artifact implicitly add the Mockito 2.x dependency to your project and exclude it.
Alternatively.. as a workaround, instead of the #RunWith(MockitoJUnitRunner.class) you can use:
#Before
public void init() {
MockitoAnnotations.initMocks(this);
}
You can also check out this Mockito cheat sheet to keep all the standards at hand.
The problem lies within your imports.
Your imports doesn't include import runner replace the following import
org.mockito.junit.MockitoJUnitRunner
with
org.mockito.runners.MockitoJUnitRunner;
In Mockito 1.10.19 (which is from 2014), there is no class org.mockito.junit.MockitoJUnitRunner. This was introduced later in 2.x. If you really want to use 1.10.19, you should probably use the then correct class org.mockito.runners.MockitoJUnitRunner which then should work.
But I would strongly recommend using a newer Mockito version instead. mockito-all is simply not the right artifact to depend on anymore. With 2.x this artefact was not maintained anymore.
i ran into the same issue with following versions.
In my case there was a mockito-core dependency through org.apache.maven:maven:3.6.3. So i had to override the dependency.
<version.maven-surefire-plugin>3.0.0-M5</version.maven-surefire-plugin>
<version.junit-jupiter-engine>5.8.2</version.junit-jupiter-engine>
<version.mockito-junit-jupiter>4.3.1</version.mockito-junit-jupiter>
to check this, you can use: mvn help:effective-pom -Dverbose=true -Doutput=effective-pom.xml
I try to mock a final method (readChar of class DataInputStream):
MyClassTest
#RunWith(PowerMockRunner.class)
#PrepareForTest(DataInputStream.class)
public class MyClassTest {
#Test
public void testMyMethod() throws IOException {
DataInputStream mockStream = PowerMockito.mock(DataInputStream.class);
Mockito.when(mockStream.readChar()).thenReturn('a');
System.out.println(mockStream.readChar()); // OK (print 'a')
Assert.assertEquals('a', MyClass.myMethod(mockStream));
}
}
MyClass
public class MyClass {
public static char myMethod(DataInputStream dis) throws IOException {
return dis.readChar(); // NPE raises
}
}
It works when calling the mocked method in testMyMethod() but in myMethod() NullPointerException raises, why?
EDIT :
The complete failure trace :
java.lang.NullPointerException
at java.io.DataInputStream.readChar(Unknown Source)
at test.test.MyClass.myMethod(MyClass.java:8)
at test.test.MyClassTest.testMyMethod(MyClassTest.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:310)
at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79)
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:294)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:282)
at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77)
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:207)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:146)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:122)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:104)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:53)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
First this code is a mock antipattern : Don't mock types you don't own! (see this answer on StackOverflow)
Second, DataInputStream is a class of the JDK PowerMock cannot use the same hacky classloader that modifies byte code.
For that there's a solution and two possible tricks :
use the interface
encapsulate the call in a class that you own, then prepare this class instead, documented here at google code, or even better make your own mockable class (without the need of powermock)
use an agent, documented here at google code
The first option is clearly the very best, and the first two options also allows one to avoid this mock antipattern.
DataInputStream is a 'system' class from JVM which is probably already loaded by JVM.
#PrepareForTest would have to remove final modifier from the methods (to be able to mock), but it can't do so for already-loaded classes (HotSpot JVM doesn't support class signature changes for already-loaded classes), and this is probably why you get this exception.
Luckily there's also DataInput interface implemented by DataInputStream - maybe you can try mocking not DataInputStream but DataInput, for this you don't even need PowerMock, just Mockito.
I've got such a code snippet:
#RunWith(PowerMockRunner.class)
#PrepareForTest({Thread.class})
public class AllMeasuresDataTest {
#Before
public void setUp() throws Exception {
}
#Test
public void testGetMeasures() {
AllMeasuresData measure = new AllMeasuresData();
assertEquals(measure.getMeasures(), null);
HashMap<String, Measure> map = new HashMap<String, Measure>();
measure.setMeasures(map);
assertEquals(measure.getMeasures(), map);
measure.setMeasures(null);
assertEquals(measure.getMeasures(), null);
}
#Test
public void testAllMeasuresData() throws IOException {
ClassLoader loader = PowerMockito.mock(ClassLoader.class);
Thread threadMock = PowerMockito.mock(Thread.class);
Vector<URL> vec = new Vector<URL>();
Mockito.when(loader.getResources("measure")).thenReturn(vec.elements());
Mockito.when(threadMock.getContextClassLoader()).thenReturn(loader);
PowerMockito.mockStatic(Thread.class);
Mockito.when(Thread.currentThread()).thenReturn(threadMock);
...
}
}
While running this tests I got:
java.lang.LinkageError: loader constraint violation: loader (instance of org/powermock/core/classloader/MockClassLoader) previously initiated loading for a different type with name "javax/management/MBeanServer"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
at org.powermock.core.classloader.MockClassLoader.loadUnmockedClass(MockClassLoader.java:201)
at org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:149)
at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:67)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at org.codecover.instrumentation.java.measurement.ProtocolImpl.initializeMBean(ProtocolImpl.java:247)
at org.codecover.instrumentation.java.measurement.ProtocolImpl.<init>(ProtocolImpl.java:237)
at org.codecover.instrumentation.java.measurement.ProtocolImpl.getInstance(ProtocolImpl.java:185)
at measure.CodeCoverCoverageCounter$6ya5ud0ow79ijrr1dvjrp4nxx60qhxeua02ta2fzpmb1d.<clinit>(MeasureCalculatorsHolder.java:146)
at measure.MeasureCalculatorsHolder.<clinit>(MeasureCalculatorsHolder.java:17)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:188)
at javassist.runtime.Desc.getClassObject(Desc.java:43)
at javassist.runtime.Desc.getClassType(Desc.java:152)
at javassist.runtime.Desc.getType(Desc.java:122)
at javassist.runtime.Desc.getType(Desc.java:78)
at algorithm.AllMeasuresDataTest.testGetMeasures(AllMeasuresDataTest.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:66)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:312)
at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:86)
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:94)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:296)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit49RunnerDelegateImpl$PowerMockJUnit49MethodRunner.executeTestInSuper(PowerMockJUnit49RunnerDelegateImpl.java:116)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit49RunnerDelegateImpl$PowerMockJUnit49MethodRunner.executeTest(PowerMockJUnit49RunnerDelegateImpl.java:77)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:284)
at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:84)
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:49)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:209)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:148)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:122)
at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:101)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:53)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.codecover.juniteclipse.runner.EclipseTestRunner.main(EclipseTestRunner.java:40)
Do you know how can I prevent this? I maybe there is another way to mock such a piece of code:
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
...
Enumeration<URL> resources = classLoader.getResources(path);
Try adding this annotation to your Test class:
#PowerMockIgnore("javax.management.*")
Worked for me.
Similar to the accepted response here, I ended up having to exclude all of the SSL related classes:
#PowerMockIgnore({"javax.management.*", "org.apache.http.conn.ssl.*", "com.amazonaws.http.conn.ssl.*", "javax.net.ssl.*"})
Adding that to the top of my class resolved the error.
Classloader conflict, use this: #PowerMockIgnore("javax.management.*")
Let mock classloader do not load javax.*.
It works.
This may be a bit of an old topic, but I have also ran into this problem. Turns out that some of the java versions cannot handle powermockito when powermock finds out there are 2 classes with the same name in the same package (over different dependencies).
With any version higher than Java 7_25 it gives this error.
In PowerMock 1.7.0 a user-defined global configuration can be added to your project's classpath. PowerMockConfig
org/powermock/extensions/configuration.properties
Simply add a line in the properties file like:
powermock.global-ignore=javax.management.*
This will resolve the error for all the test classes in your project.
In order to mock system classes, prepare the class that is the target of the test, not Thread.class. There's no way PowerMock will be able to instrument Thread.class because it is required during JVM startup - well before PowerMock can instrument.
The way instrumentation works, once a class is loaded, it can no longer be intstrumented.
See the PowerMock wiki.
Depending on your individual setup, it may be necessary to add more methods to #PowerMockIgnore. I stumbled over this with slf4j, for using PowerMock and slf4j together, you'll need
#PowerMockIgnore({ "com.sun.org.apache.xerces.*", "javax.xml.*", "org.xml.*", "javax.management.*", "org.w3c.dom.*" })
I am trying to customize a runner for junit. I am using the Extended runner given here:
http://codehowtos.blogspot.com/2011/04/run-junit-test-repeatedly.html
adding my own created Filter Runner's code, which extends Runner, to the ExtendedRunner which i got from the above link. When i try to run the test it gives me the below error.
java.lang.Exception: No runnable methods
at org.junit.runners.BlockJUnit4ClassRunner.validateInstanceMethods(BlockJUnit4ClassRunner.java:157)
at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:102)
at org.junit.runners.ParentRunner.validate(ParentRunner.java:336)
at org.junit.runners.ParentRunner.<init>(ParentRunner.java:74)
at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:56)
at com.util.ExtendedRunner.<init>(ExtendedRunner.java:35)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:31)
at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:24)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:29)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:24)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:32)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:41)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:31)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
any help to resolve the same??
From what I understand, your ExtendedRunner extends BlockJUnit4ClassRunner that extends the ParentRunner. When looking at the code of this last class, the only thing done in the constructor is to "register" the class you passed to this runner and its information.
So most likely, the class does not have any methods tagged as tests. If you are using JUnit 4, don't forget the #Test annotation before all test methods.