用JAVA_OPTS env变量运行java [英] Running java with JAVA_OPTS env variable

问题描述

在shell脚本中，我设置了JAVA_OPTS环境变量（以启用远程调试并增加内存），然后执行jar文件，如下所示：

In a shell script, I have set the JAVA_OPTS environment variable (to enable remote debugging and increase memory), and then I execute the jar file as follows:

export JAVA_OPTS="-Xdebug -Xrunjdwp:transport=dt_socket,address=8001,server=y,suspend=n -Xms512m -Xmx512m"
java -jar analyse.jar $*

但似乎没有JAVA_OPTS env变量的影响，因为我无法连接到远程调试和我看到JVM的内存没有变化。

But it seems there is no effect of the JAVA_OPTS env variable as I cannot connect to remote-debugging and I see no change in memory for the JVM.

可能是什么问题？

PS：我不能在 java -jar analyse.jar $ * 命令中使用这些设置，因为我在应用程序中处理命令行参数。

PS: I cannot use those settings in the java -jar analyse.jar $* command because I process command line arguments in the application.

推荐答案

我不知道任何实际检查 JAVA_OPTS 环境变量。通常这用于启动JVM的脚本，它们通常只是将它添加到 java 命令行。

I don't know of any JVM that actually checks the JAVA_OPTS environment variable. Usually this is used in scripts which launch the JVM and they usually just add it to the java command-line.

这里要理解的关键是 java 的参数之前的 -jar analyse.jar bit只会影响JVM，不会传递给你的程序。因此，将脚本中的 java 行修改为：

The key thing to understand here is that arguments to java that come before the -jar analyse.jar bit will only affect the JVM and won't be passed along to your program. So, modifying the java line in your script to:

java $JAVA_OPTS -jar analyse.jar $*

应该正常工作。

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