Defining Java Heap Size for All Users on a Windows System

Question

I am relatively new to Java we are running Java 8 JRE Update 211 32bit on Windows 10 PC and Server 2019 and I am trying to define heap size for all users who login to the PCs/Servers.

I know the Java is out of date but the Java has been suggested by Application providers and our network is closed off to the internet and really locked down.

I have done some googling seems like you can define this in the Deployment.properties file (located in C:\Windows\Sun\Java\Deployment) currently I have this:

deployment.javaws.jre.0.args=-xms1024M

deployment.javaws.jre.0.args=-xmx3072M

deployment.javaws.jre.0.args=-xmn512M

I do know that maximum you can define 2GB on 32bit systems.

I am unable to find any Java forums or help on these commands I found some on the internet and tweaked them I wanted to know if these are correct above?

We have been advised from the application side (Cramer) the heap size has doubled and still getting this message.

Edit Added:

Unable to do this from the Java Control Panel as the system tab area is greyed out:

Also ran the commands:

javaw -XX:+PrintFlagsFinal | find "MaxHeapSize"

javaw -XX:+PrintFlagsFinal | find "InitialHeapSize"

Found that the Java has not picked up the changes that have been defined in the deployment.properties file:

I believe the digits outputted above are in bytes which converting them to MBs doesn't match the values I defined.

Answer 1

I have figured it out.

So, first thing I did was remove definitions of heap sizes I added to the deployment.properties file.

I had to create a system variable called:

Variable name: _JAVA_OPTIONS

Variable value: -Xmx512M

Also, had to add to the PATH Variable Java bin folder location:

C:\Program Files (x86)\Java\jre1.8.0_211\bin

Then rebooted the server and when I entered the following command:

javaw -XX:+PrintFlagsFinal | find "MaxHeapSize"

Then I saw the Max Heap size was set to 512MB for all users which is what I was trying to achieve.

I didn't want to start messing about with the initial heap size settings as this was causing a few issues.

Now I can foresee another issue I need to resolve is how to define different Max Heap Sizes for 32bit and 64bit Java's install on one Operation System.

Answer 2

I am guessing you have the JRE installed in the system through an installer. If this is the case, go to Control Settings and select show small icons:

There you have java settings. Click on it and you will be greeted with a settings window for your JRE. Go to the Java Tab and then click display.

Add on runtime parameters the parameters you need (e.g. -Xmx3072M). You can choose whether you want to do that for the Users or for the whole system (hence the tabs).