如何跟踪在jvm中加载和销毁类的时间？ [英] How to track when class is loaded and destroyed in jvm?

问题描述

如何在jvm中加载和销毁类时跟踪？是否有jvm公开的回调方法？

How do I keep track when class is loaded and destroyed in jvm? Is there any callback method that is exposed by the jvm?

推荐答案

如果你使用的是Sun / Oracle JVM，你可以使用 TraceClassLoading 和 TraceClassUnloading 选项。使用以下命令查看JVM支持的选项：

If you're using a Sun/Oracle JVM, you could use the TraceClassLoading and TraceClassUnloading options. Use the following to see what options your JVM supports:

java -XX:+AggressiveOpts -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+PrintFlagsFinal -version

如果支持这些选项，请使用<$运行Java应用程序c $ c> -XX：+ TraceClassLoading -XX：+ TraceClassUnloading 。您应该看到以下消息：

If these options are supported, run your Java application using -XX:+TraceClassLoading -XX:+TraceClassUnloading. You should see messages like:

[Loaded ... from ...]
[Unloading class ...]

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