安装完JDK ，设定环境变量后出现这个错误：
[root@localhost lib]# javac
Error occurred during initialization of VM
java/lang/NoClassDefFoundError: java/lang/Object
[root@localhost lib]# java
Error occurred during initialization of VM
java/lang/NoClassDefFoundError: java/lang/Object
解决办法：分别把
/opt/jdk1.6.0_15/lib/ tools.pack 转为 tools.jar
/opt/jdk1.6.0_15/jre/lib/rt.pack 转为 rt.jar
[root@localhost lib]# pwd
/opt/jdk1.6.0_15/lib
[root@localhost lib]# unpack200 tools.pack tools.jar
[root@localhost lib]# ls
ct.sym htmlconverter.jar jconsole.jar orb.idl tools.jar tools.pack.bak
dt.jar ir.idl jexec sa-jdi.jar tools.pack visualvm
[root@localhost lib]# pwd
/opt/jdk1.6.0_15/jre/lib
[root@localhost lib]# unpack200 rt.pack rt.jar