Blade c jvm script will be repeated multiple times

[auyang-0626]

bug report

./blade c jvm script 会重复挂载多次watch，导致script-file执行多次

通过blade 执行下面的命令多次，第一次成功，之后就报错，看起来没有任何问题。

但是观察到脚本被调用了多次，如下图

通过阅读源代码发现，每次执行命令，都会走到com.alibaba.chaosblade.exec.bootstrap.jvmsandbox.SandboxModule#add，然后调用sandbox的watch方法添加一个listener。这步完成之后，才会走到判断重复的逻辑，返回错误信息，但是实际上已经再次通过sandbox增强了指定类。

所以判断重复的操作应该提前进行！

[chaosblade-bot]

Hi @auyang-0626, we detect non-English characters in the issue. This comment is an auto translation from @chaosblade-bot to help other users to understand this issue.
We encourage you to describe your issue in English which is more friendly to other users.

Blade c jvm script will be repeated multiple times

bug report

./blade c jvm script will repeatedly mount multiple watches, causing script-file to execute multiple times

Execute the following command multiple times through blade, the first success, then the error, it seems that there is no problem.

But observed that the script was called multiple times, as shown below

By reading the source code, each time you execute the command, you will go to com.alibaba.chaosblade.exec.bootstrap.jvmsandbox.SandboxModule#add, and then call the sandbox watch method to add a listener. After this step is completed, it will go to the logic of judging the repetition and return the error message, but the specified class has actually been enhanced by the sandbox again.

So judging repeated operations should be done in advance!

[xcaspar]

@auyang-0626 Thanks for reporting the bug. Can you fix it?

[No-sleeping]

bug report

./blade c jvm script 会重复挂载多次watch，导致script-file执行多次

通过blade 执行下面的命令多次，第一次成功，之后就报错，看起来没有任何问题。

但是观察到脚本被调用了多次，如下图

通过阅读源代码发现，每次执行命令，都会走到com.alibaba.chaosblade.exec.bootstrap.jvmsandbox.SandboxModule#add，然后调用sandbox的watch方法添加一个listener。这步完成之后，才会走到判断重复的逻辑，返回错误信息，但是实际上已经再次通过sandbox增强了指定类。

所以判断重复的操作应该提前进行！

麻烦问一下，这里注入的脚本是一定要和目标项目打包在一起么？
或者有没有可能麻烦宁发一下您注入脚本的demo呢。