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`Arthas` 是Alibaba开源的Java诊断工具，深受开发者喜爱。在线排查问题，无需重启；动态跟踪Java代码；实时监控JVM状态。
本教程会以一个简单的应用为例，演示如果调试`ognl`表达式。
* Github: https://github.com/alibaba/arthas
* 文档: https://arthas.aliyun.com/doc/