又及:java中的endorsed技术
官方解释 java endorsed http://java.sun.com/javase/6/docs/technotes/guides/standards/index.html (为什么我弄的链接总是不成功。。。。)
Specifying the -Djava.endorsed.dirs=lib/endorsed system property on the Java command line will force the JVM to prefer any library it finds in the endorsed directory over its own system libraries. Copying the jars into $JAVA_HOME/jre/lib/endorsed will do the same thing.