CODEWITHSUNDEEP
java
shmth
shmth

Reputation: 498

Start separate process to run Java program using same JRE

I want to start a separate process from my java program to run another java program using same JRE that the current java program is executing in. Normally, I could get the path to the java executable using System.getProperty, but the java program is running in a bundled jre (Mac app package) which doesn't actually contain a java executable. Therefore, I'm wondering if there is there any API to directly run a Java program in a separate process?

Upvotes: 1

Views: 938

Answers (3)

Ville Mönkkönen
Ville Mönkkönen

Reputation: 21

Javapackager from Java version 9 on includes the bundler argument -strip-native-commands which leaves the executables in the bundled JRE. Just include the option: 

-Bstrip-native-commands=false

Upvotes: 1

Srikanth Balaji
Srikanth Balaji

Reputation: 2718

This may give a better picture.

Get the Java executable using below.

System.getProperty("java.home") + "/bin/java"

ReConstruct the class path,

((URLClassLoader() Thread.currentThread().getContextClassLoader()).getURL()

From here, you can start the new process using

Process.exec(javaExecutable, "-classpath", urls.join(":"), CLASS_WIH_MAIN)

Upvotes: 0

Timothy Truckle
Timothy Truckle

Reputation: 15624

The API is public hosted here: http://docs.oracle.com/javase/8/docs/api/

and the information you are looking for cons from the System utility class:

All available properties are listed here: http://docs.oracle.com/javase/8/docs/api/java/lang/System.html#getProperties--

The current JVMs location is available via "java.home".

So what your looking for is:

 String javaPath = new File( System.getProperty("java.home"),"bin/java").absolutePath();

Upvotes: 0

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