的Java，ASM org.objectweb.asm.util.CheckClassAdapter导致不支持MAJOR.MINOR版本0.0

Question

我得到以下异常：

java.lang.UnsupportedClassVersionError: net/sourceforge/barbecue/BarcodeException : **Unsupported major.minor version 0.0** 
    at java.lang.ClassLoader.defineClass1(Native Method) 
    at java.lang.ClassLoader.defineClass(ClassLoader.java:621) 
    at java.lang.ClassLoader.defineClass(ClassLoader.java:466) 
    at pl.wroc.pwr.judy2.master.TestClassLoader.loadClass(TestClassLoader.java:51) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252) 
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) 
    at java.lang.Class.getDeclaredConstructors0(Native Method) 
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389) 
    at java.lang.Class.getConstructor0(Class.java:2699) 
    at java.lang.Class.getConstructor(Class.java:1657) 
    at junit.framework.TestSuite.getTestConstructor(TestSuite.java:83) 
    at junit.framework.TestSuite.<init>(TestSuite.java:131) 
    at org.junit.internal.runners.JUnit38ClassRunner.<init>(JUnit38ClassRunner.java:67) 
    at org.junit.internal.builders.JUnit3Builder.runnerForClass(JUnit3Builder.java:14) 
    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 junit.framework.JUnit4TestAdapter.<init>(JUnit4TestAdapter.java:31) 
    at junit.framework.JUnit4TestAdapter.<init>(JUnit4TestAdapter.java:24) 
    at pl.wroc.pwr.judy2.util.JUnitTestRunner.runTest(JUnitTestRunner.java:26) 

当试图乐器一些字节码下面的源代码。 （准确地说，我得到这个异常，当我试图执行修改后的字节码）

public byte[] instrument(byte[] bytecode) 
     { 

     ClassReader cr = new ClassReader(bytecode); 
     ClassWriter cw = new ClassWriter(cr, 0); 

     // create new class adapter 
     AbstractInstrumentClassAdapter ca = new InstrumentClassAdapterTracer(cw, tracer); 
     // System.out.println("----------------------------------- Daikon start"); 
     cr.accept(ca, 0); 

     ClassReader cr2 = new ClassReader(cw.toByteArray()); 
     ClassWriter cw2 = new ClassWriter(cr2, 0); 
     ClassAdapter checker = new CheckClassAdapter(cw); 
     AbstractInstrumentClassAdapter ca2 = new InstrumentClassAdapterInstrumenter(checker); 

     cr2.accept(checker, 0); 
     return cw2.toByteArray(); 
    } 

我想这可能是我InstrumentClassAdapterInstrumenter实现，所以我离开它，我目前只使用CheckClassAdapter。任何人都可以看到我做错了什么？

干杯，

Answer 1

LOL，终于如我在这里问了一些问题，这似乎是简单的打字错误，应该是

ClassWriter cw2 = new ClassWriter(cr2, 0); 
ClassAdapter checker = new CheckClassAdapter(cw2); 

不

ClassWriter cw2 = new ClassWriter(cr2, 0); 
ClassAdapter checker = new CheckClassAdapter(cw);