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springloaded官方说明：

Spring Loaded is a JVM agent for reloading class file changes whilst a JVM is running. It transforms classes at loadtime to make them amenable to later reloading. Unlike 'hot code replace' which only allows simple changes once a JVM is running (e.g. changes to method bodies), Spring Loaded allows you to add/modify/delete methods/fields/constructors. The annotations on types/methods/fields/constructors can also be modified and it is possible to add/remove/change values in enum types.
Spring Loaded is usable on any bytecode that may run on a JVM, and is actually the reloading system used in Grails 2.

1.下载springloaded-1.2.5.RELEASE.jar，地址：

2. 把springloaded-1.2.5.RELEASE.jar放到tomcat的bin文件夹下

3. 打开bin下的catalina.bat,添加如下一句
set JAVA_OPTS=-javaagent:springloaded-1.2.5.RELEASE.jar -noverify

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