我必须按websockets对List Foo个name个对象进行排序。
我写了一个像这样的方法（类：FooUtils）：
private void sortByName(List<Foo> foos) {
foos.sort(Comparator.comparing(Foo::getName));
}
我使用PowerMock来测试私有方法。测试看起来像这样：
@Test
public void sortByName(){
List<Foo> unsortedFoos = //prepare unsorted list of foos
List<Foo> expectedFoos = //prepare expected, sorted list of foos
Whitebox.invokeMethod(FooUtils, "sortByName", unsortedFoos );
Assert.assertEquals(expectedFoos, unsortedFoos);
}
然而测试原因错误：
java.lang.IllegalStateException: Failed to transform class with name pl.sample.Foo. Reason: javassist.bytecode.InterfaceMethodrefInfo cannot be cast to javassist.bytecode.MethodrefInfo
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 sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:114)
at sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:125)
at sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49)
at sun.reflect.annotation.AnnotationParser.parseSig(AnnotationParser.java:439)
at sun.reflect.annotation.AnnotationParser.parseClassValue(AnnotationParser.java:420)
at sun.reflect.annotation.AnnotationParser.parseClassArray(AnnotationParser.java:724)
at sun.reflect.annotation.AnnotationParser.parseArray(AnnotationParser.java:531)
at sun.reflect.annotation.AnnotationParser.parseMemberValue(AnnotationParser.java:355)
at sun.reflect.annotation.AnnotationParser.parseAnnotation2(AnnotationParser.java:286)
at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:120)
at sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:72)
at java.lang.Class.createAnnotationData(Class.java:3508)
at java.lang.Class.annotationData(Class.java:3497)
at java.lang.Class.getAnnotation(Class.java:3402)
at org.junit.internal.MethodSorter.getDeclaredMethods(MethodSorter.java:52)
at org.junit.internal.runners.TestClass.getAnnotatedMethods(TestClass.java:45)
at org.junit.internal.runners.MethodValidator.validateTestMethods(MethodValidator.java:71)
at org.junit.internal.runners.MethodValidator.validateStaticMethods(MethodValidator.java:44)
at org.junit.internal.runners.MethodValidator.validateMethodsForDefaultRunner(MethodValidator.java:50)
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 org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl.<init>(PowerMockJUnit47RunnerDelegateImpl.java:42)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit49RunnerDelegateImpl.<init>(PowerMockJUnit49RunnerDelegateImpl.java:25)
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.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: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.junit.internal.requests.FilterRequest.getRunner(FilterRequest.java:31)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:49)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:237)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.lang.ClassCastException: javassist.bytecode.InterfaceMethodrefInfo cannot be cast to javassist.bytecode.MethodrefInfo
at javassist.bytecode.ConstPool.getMethodrefType(ConstPool.java:452)
at javassist.bytecode.stackmap.Tracer.doInvokeMethod(Tracer.java:800)
at javassist.bytecode.stackmap.Tracer.doOpcode148_201(Tracer.java:597)
at javassist.bytecode.stackmap.Tracer.doOpcode(Tracer.java:81)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:187)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:199)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:164)
at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:108)
at javassist.bytecode.MethodInfo.rebuildStackMap(MethodInfo.java:423)
at javassist.bytecode.MethodInfo.rebuildStackMapIf6(MethodInfo.java:405)
at javassist.CtBehavior.insertBefore(CtBehavior.java:768)
at javassist.CtBehavior.insertBefore(CtBehavior.java:734)
at org.powermock.core.transformers.impl.MainMockTransformer.modifyMethod(MainMockTransformer.java:197)
at org.powermock.core.transformers.impl.MainMockTransformer.allowMockingOfStaticAndFinalAndNativeMethods(MainMockTransformer.java:133)
at org.powermock.core.transformers.impl.MainMockTransformer.transform(MainMockTransformer.java:65)
at org.powermock.core.classloader.MockClassLoader.loadMockClass(MockClassLoader.java:251)
... 58 more
更重要的是，当我用{替换Comparator.comparing(Foo::getName)时
(u1, u2) -> u1.getName().compareTo(u2.getName())然后成功测试通过。
我已阅读此主题：PowerMock and Java 8 issue: InterfaceMethodrefInfo cannot be cast to MethodrefInfo
当我将排除javassist并将其添加为依赖项时，测试通过但是春季启动应用程序无法启动时出现错误：
2017-02-20 09:23:20,920 ERROR [localhost-startStop-1 ] SpringApplication - Application startup failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: javassist/bytecode/ClassFile
所以这对我来说不是解决方案。
所以我的问题是，有没有其他解决方案，或者我可能只需要使用旧方法对Comparator.comparing()列表进行排序？