sealing violation can't seal package

iteye_15500

于 2011-08-17 14:51:00 发布

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文章标签： java 数据库

本文描述了一个关于两个相同功能的JAR包导致的冲突问题，具体表现为无法密封org.apache.jackrabbit.webdav.client.methods包，这导致了加载类时出现安全异常。文章通过异常堆栈跟踪展示了冲突的具体细节。

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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)