How to set the system variables using java program [duplicate]

Question

I want to set environment variable in JAVA . For this , I have searched a lot in internet and got the following code

ProcessBuilder pb = new ProcessBuilder();
Map<String, String> env = pb.environment();
env.put("DS_HOME", "C:\\MyFile\\jboss-eap-6.4\\modules\\com\\mycom\\library\\d_home");
env.put("CS_HOME", "C:\\MyFile\\jboss-eap-6.4\\modules\\com\\mycom\\library\\c_home");
pb.command("cmd.exe", "/c", "echo", "%DS_HOME%");
pb.command("cmd.exe", "/c", "echo", "%CS_HOME%");
try {
    pb.inheritIO().start();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
Map<String, String> getenv = System.getenv();
Set<Entry<String,String>> entrySet = getenv.entrySet();
for (Entry<String, String> entry : entrySet) {
    System.out.println(entry.getKey() + " " + entry.getValue());
}

After Executing this code, i am not getting the custom variables which i have set using ProcessBuilder. Please help me out to solve this. I want to execute a service which needs some environments variables and to i am trying to set the system varibales using java code.

You can't set the system environment using java, although you can set it which last till the current process is running. — Sandeep Kokate
– Sandeep Kokate, Commented Oct 11, 2019 at 7:16

paulsm4 · Accepted Answer · 2019-10-11 08:05:16Z

1

Strong suggestion:

Your best bet is probably to:

Write a .bat file that: a) Sets your environment variables, then b) calls your .exe
Have your Java program invoke the .bat file

For whatever it's worth, here's how you'd change Windows system environment variables from C or C++ using Win32 APIs:

https://learn.microsoft.com/en-us/windows/win32/procthread/environment-variables

answered Oct 11, 2019 at 8:05

paulsm4

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Comments

Oo.oO · Accepted Answer · 2020-02-20 21:15:22Z

0

If you want to alter system variables for your current Java process, you will have to go via JNI

Settings environment variable inside JVM via JNI https://github.com/mkowsiak/jnicookbook/tree/master/recipes/recipeNo043

edited Feb 20, 2020 at 21:15

answered Oct 11, 2019 at 8:08

Oo.oO

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