在Windows上通过命令行设置JVM [英] Setting the JVM via the command line on Windows

问题描述

当您调用java jar jar_name.jar时，可以指定要使用的JVM。我有两个JVM安装在我的机器上。我无法更改JAVA_HOME，因为它可能会破坏所有已准备就绪的代码。

Is it possible to specify the JVM to use when you call "java jar jar_name.jar" . I have two JVM installed on my machine. I can not change JAVA_HOME as it may break code that is all ready running.

种类问题

Stephen

推荐答案

是 - 只是显式提供java.exe的路径。例如：

Yes - just explicitly provide the path to java.exe. For instance:

c:\Users\Jon\Test>"c:\Program Files\java\jdk1.6.0_03\bin\java.exe" -version
java version "1.6.0_03"
Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
Java HotSpot(TM) Client VM (build 1.6.0_03-b05, mixed mode, sharing)

c:\Users\Jon\Test>"c:\Program Files\java\jdk1.6.0_12\bin\java.exe" -version
java version "1.6.0_12"
Java(TM) SE Runtime Environment (build 1.6.0_12-b04)
Java HotSpot(TM) Client VM (build 11.2-b01, mixed mode, sharing)

为运行命令shell执行此操作是类似于：

The easiest way to do this for a running command shell is something like:

set PATH=c:\Program Files\Java\jdk1.6.0_03\bin;%PATH%

例如，这里有一个完整的会话， JVM，然后修改路径，然后新建一个：

For example, here's a complete session showing my default JVM, then the change to the path, then the new one:

c:\Users\Jon\Test>java -version
java version "1.6.0_12"
Java(TM) SE Runtime Environment (build 1.6.0_12-b04)
Java HotSpot(TM) Client VM (build 11.2-b01, mixed mode, sharing)

c:\Users\Jon\Test>set PATH=c:\Program Files\Java\jdk1.6.0_03\bin;%PATH%

c:\Users\Jon\Test>java -version
java version "1.6.0_03"
Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
Java HotSpot(TM) Client VM (build 1.6.0_03-b05, mixed mode, sharing)

$ b b

这不会改变明确使用JAVA_HOME的程序。

This won't change programs which explicitly use JAVA_HOME though.

请注意，如果你在路径中得到错误的目录 - 包括不存在的目录 - 你不会得到任何错误，它将有效地被忽略。

Note that if you get the wrong directory in the path - including one that doesn't exist - you won't get any errors, it will effectively just be ignored.

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