sealing violation can't seal package

 

 http://www.ibm.com/developerworks/cn/java/l-seal/

有2个相同功能的JAR包。会有冲突

 

 

Exception in thread "main" java.lang.SecurityException: sealing violation: can't seal package org.apache.jackrabbit.webdav.client.methods: already loaded
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at com.webex.go.TestDoc.main(TestDoc.java:65)