10

我得到这样的堆栈跟踪:

java.lang.NoClassDefFoundError: sun/reflect/GeneratedMethodAccessor1
    at sun.reflect.GeneratedMethodAccessor1.<clinit>(Unknown Source)
    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 java.lang.Class.newInstance0(Class.java:355)
    at java.lang.Class.newInstance(Class.java:308)
    at sun.reflect.MethodAccessorGenerator$1.run(MethodAccessorGenerator.java:381)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.reflect.MethodAccessorGenerator.generate(MethodAccessorGenerator.java:377)
    at sun.reflect.MethodAccessorGenerator.generateMethod(MethodAccessorGenerator.java:59)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:28)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at edu.tufts.cs.testsim.LogicalProcess.dispatchMessage(LogicalProcess.java:214)
    at edu.tufts.cs.testsim.LogicalProcess.processForward(LogicalProcess.java:287)
    at edu.tufts.cs.testsim.LogicalProcess.doOperation(LogicalProcess.java:423)
    at edu.tufts.cs.testsim.LogicalProcess.run(LogicalProcess.java:434)
    at java.lang.Thread.run(Thread.java:637)
Caused by: java.lang.ClassNotFoundException: sun.reflect.GeneratedMethodAccessor1
    at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:316)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:288)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374)
    ... 19 more

什么是 GeneratedMethodAccessor1, GeneratedMethodAccessor2, GeneratedMethodAccessorN,什么可能导致它们找不到?我在运行时进行了一些字节码重写,但仅在加载类之前,并且通过反射的前几次调用工作正常。我想知道在 JIT 编译器获取我的代码之后是否会发生这种情况,但我什至不知道如何开始调试它。

4

1 回答 1

10

GeneratedMethodAccessor###是反射实现在运行时生成的类,用于调用方法和构造函数。这形成了从实际方法或构造函数的实例MethodConstructor到实际方法或构造函数的字节码桥。源代码中提供了更多信息。

反序列化也做了类似的事情,共享一些相同的机制,以调用最派生的非Serializable构造函数。

于 2009-06-21T16:25:23.237 回答