使用 JAVA_OPTS 环境变量运行 java 没有效果 [英] Running java with JAVA_OPTS env variable has no effect

问题描述

在shell脚本中，我设置了JAVA_OPTS环境变量(开启远程调试和增加内存)，然后执行jar文件如下:

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 JAVA_OPTS 环境变量没有影响，因为我无法连接到远程调试，而且我看到 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 analysis.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

我不知道有任何实际检查 JAVA_OPTS 环境变量的 JVM.通常这用于启动 JVM 的脚本中，他们通常只是将它添加到 java 命令行中.

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-jar analysis.jar位之前的java参数只会影响JVM并且不会传递给您的程序.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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