在跑程序时，有些时候会发现NoSuchMethodException，出现这种情况很大情况都是包冲突导致的
为了查看程序在运行时加载了哪里包，我们可以在调试程序加一些启动参数
如: -verbose就可以查看所加载的类
设置过程如下：
运程程序之后就会有类似的东西出现
[Opened C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.Object from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.io.Serializable from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.Comparable from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.CharSequence from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.String from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.reflect.GenericDeclaration from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.reflect.Type from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.reflect.AnnotatedElement from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.Class from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.Cloneable from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.ClassLoader from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.System from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.Throwable from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.Error from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.ThreadDeath from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.Exception from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.RuntimeException from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.security.ProtectionDomain from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.security.AccessControlContext from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.ReflectiveOperationException from C:\Program Files\Java\jre7\lib\rt.jar]
[Loaded java.lang.ClassNotFoundException from C:\Program Files\Java\jre7\lib\rt.jar]
上面的信息就是说你加载的类是从哪个jar包里面来的
这样就可以确定你加载的包对还是不对