Hot code replace (HCR)

最新推荐文章于 2023-12-23 10:32:20 发布

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最新推荐文章于 2023-12-23 10:32:20 发布

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文章标签：开发工具 java runtime

原文链接：http://www.cnblogs.com/rgqancy/p/6992888.html

Hot Code Replace (HCR) 是一种调试技术，允许在运行时替换类文件而无需重启虚拟机。此技术适用于实验性开发及迭代试错编程，但仅在类签名不变的情况下有效。例如，可以在运行过程中更改方法体，但不能添加或删除现有类的字段。

https://wiki.eclipse.org/FAQ_What_is_hot_code_replace%3F

https://zhidao.baidu.com/question/195505558.html

http://help.eclipse.org/neon/nftopic/org.eclipse.jdt.doc.isv/reference/api/org/eclipse/jdt/debug/core/IJavaHotCodeReplaceListener.html

Hot code replace (HCR) is a debugging technique whereby the Eclipse Java debugger transmits new class files over the debugging channel to another JVM. In the case of Eclipse development, this also applies to the VM that runs the runtime workbench. The idea is that you can start a debugging session on a given runtime workbench and change a Java file in your development workbench, and the debugger will replace the code in the receiving VM while it is running. No restart is required, hence the reference to "hot".

HCR has been specifically added as a standard technique to Java to facilitate experimental development and to foster iterative trial-and-error coding. HCR only works when the class signature does not change; you cannot remove or add fields to existing classes, for instance. However, HCR can be used to change the body of a method. HCR is reliably implemented only on 1.4.1 VMs and later, or using any version of the IBM J9 VM. J9 is available in IBM products such as Websphere Studio Device Developer.

If HCR does not work for you even in a simple Java application and you have confirmed that you are running the application on a supported VM (taking note that the JVM that runs Eclipse may not be the same as the JVM that is running your Java application), you may not have automatic building turned on. Make sure that 'Project > Build Automatically' is checked.

转载于:https://www.cnblogs.com/rgqancy/p/6992888.html