类装入问题解密，第 4 部分: 死锁和约束

				
				About to load class C with mycl2
ExtClassLoader attempting to find package2.C
...
About to load class A with mycl1
MyClassLoader1 attempting to find package1.A
MyClassLoader1 using classpath \C:\CL_Article\ClassloaderDeadlocks\cp1
...
ExtClassLoader could not find package2.C
...
AppClassLoader attempting to find package2.C
...
AppClassLoader could not find package2.C
...
MyClassLoader1 attempting to find package2.C
MyClassLoader1 using classpath \C:\CL_Article\ClassloaderDeadlocks\cp1
MyClassLoader1 found package1/A.class in \C:\CL_Article\ClassloaderDeadlocks\cp1
MyClassLoader1 could not find package2/C.class in \C:\CL_Article\ClassloaderDeadlocks\cp1
MyClassLoader1 could not find package2.C
...
MyClassLoader2 attempting to find package2.C
MyClassLoader2 using classpath \C:\CL_Article\ClassloaderDeadlocks\cp2
MyClassLoader2 found package2/C.class in \C:\CL_Article\ClassloaderDeadlocks\cp2
			

				

About to load class A with mycl1
Loaded Class A with mycl1
About to load class B with mycl2
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
        at java.lang.reflect.Method.invoke(Method.java:391)
        at ConstraintViolationTest.test(ConstraintViolationTest.java:31)
        at ConstraintViolationTest.main(ConstraintViolationTest.java:11)
Caused by: java.lang.LinkageError: Class C violates loader constraints:  definition mismatch between parent and child loaders
        at B.methodB(B.java:7)
        ... 7 more