Set JRE variables from java code

Question

We need to set -Xmax and -Xmin Environment variables manually but i want to set these variables from java code. Is there any way to set these variables with java code.? Thanks.

"We need to..." Is this homework then? If so, please tag it as such. — user1329572
– user1329572, Commented Jun 27, 2012 at 18:11
The answer is no. See stackoverflow.com/questions/763295/…. — Aleksander Blomskøld
– Aleksander Blomskøld, Commented Jun 27, 2012 at 18:12
We means me and my team and it is not homework.. i need to set these environment variables from application GUI. — ajkush
– ajkush, Commented Jun 28, 2012 at 5:41

Will · Accepted Answer · 2012-06-27 18:15:16Z

3

Do you need to set these settings from the running Java process? I don't believe that is possible. However, you can set them on a child process from a calling Java program, for example via the ProcessBuilder.

ProcessBuilder pb = new ProcessBuilder("myCommand", "-Xmax", value);
pb.directory(new File("dir"));
Process p = pb.start();

answered Jun 27, 2012 at 18:15

Will

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ajkush · Accepted Answer · 2012-10-17 11:30:26Z

I got this solution for this problem:-

     public static void main(String[] args) {
     Properties prop = new Properties();
     try {
        String path=System.getenv("APPDATA");
          path=path.substring(0,path.lastIndexOf('\\')+1)+"LocalLow\\Sun\\Java\\Deployment\\deployment.properties";
            System.err.println(path);

            prop.load(new FileInputStream(path));
            String jreIndex = null; 
            Enumeration enuKeys = prop.keys();
            while (enuKeys.hasMoreElements()) {
                String key = (String) enuKeys.nextElement();
                String value = prop.getProperty(key);
                if(value.contains("1.6.0_26")){
                    String[] st2 = key.split("\\.");  
                    if(st2.length==5){
                        jreIndex = st2[3];
                    }
                }
            }
            //SystemSettings SysConfigsettings = new SystemSettings();
            if(jreIndex != null){
            //  if (SysConfigsettings.getValue(SystemSettings.JRE_HEAP_SIZE))
              {
                prop.setProperty("deployment.javaws.jre."+jreIndex+".args", "-Xmx1024m");
              }
            }
            prop.store(new FileOutputStream(path), "UpdatedHeapSize");
            System.out.println("First : "+prop.getProperty("deployment.javaws.jre.0.args"));
    } catch (Exception e) {
        e.printStackTrace();
    }

}

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