解决 class file has wrong version 49.0, should be 48.0 的方法

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有些时间，我们会遇到版本不匹配的问题。如：

bad class file: /usr/java/jdk1.5.0_06/jre/lib/rt.jar(java/lang/Object.class)
class file has wrong version 49.0, should be 48.0
Please remove or make sure it appears in the correct subdirectory of the classpath.

这是因为编译环境和运行环境的不一致造成的，比如tomcat5.5和jdk1.5配合的时候，可能就会出现。解决这个问题的方法：copy jdk1.5的lib/tools.jar到tomcat5.5的common/lib/tools.jar，覆盖掉原有文件就可以了。

解决 class file has wrong version 49.0, should be 48.0 的方法
解决 class file has wrong version 49.0, should be 48.0 的方法
class file has wrong version 49.0,should be 48.0
class file has wrong version 49.0, should be 48.0
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