How to Get Vm Arguments from Inside of Java Application

How to get VM arguments from inside of Java application?

With this code you can get the JVM arguments:

import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
...
RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
List<String> arguments = runtimeMxBean.getInputArguments();

Is there a Java API to get the VM arguments?

This method will give you all the command line arguments RuntimeMXBean.getInputArguments()

How to read the -Dserver.ref VM argument

This should work:

final String ref = System.getProperty("server.ref");

ref should be equal to "test".

Getting the parameters of a running JVM

You can use jps like:

jps -lvm

It prints something like:

4050 com.intellij.idea.Main -Xms128m -Xmx512m -XX:MaxPermSize=250m -ea -Xbootclasspath/a:../lib/boot.jar -Djb.restart.code=88
4667 sun.tools.jps.Jps -lvm -Dapplication.home=/opt/java/jdk1.6.0_22 -Xms8m

Loading VM arguments from a file when running a Java application on Windows

The best solution I've found today is to create the cmd file as follows:

@echo off
set LIST=
for /F %%k in (vmarguments.txt) DO call :concat %%k
echo %LIST%
java %LIST% VMArgumentsFromFile
:concat
set LIST=%LIST% %1
goto :eof

This approach requires that the vm arguments in the text file are surrounded in quotes and on their own lines.

This is based off the answer at: How to concatenate strings in a Windows batch file?

How can I specify the default JVM arguments for programs I run from eclipse?

Yes, right click the project. Click Run as then Run Configurations. You can change the parameters passed to the JVM in the Arguments tab in the VM Arguments box.

That configuration can then be used as the default when running the project.

Specifying JVM arguments when calling a jar file?

Do it like:

java -Xms256m -Xmx512m -Djava.awt.headless=true -jar filename.jar

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