JVM Tuning for JBoss EAP

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JVM Tuning for JBoss EAP

JBoss Enterprise Application Platform leverages a Java Virtual Machine to run its standalone server and host its applications. As we deploy our applications and leverage JBoss, we want to ensure our apps have optimal performance, and a portion of that lies in optimizing the JVM itself. In this hands-on lab, we explore a number of Java options we can set to ensure our JVM it running the best it can.

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Lab Info

Level

Beginner

Last updated

Sep 21, 2025

Duration

15m

Challenge

Check for Existing JVM Settings
See if there are any existing Java settings to consider:
```
echo $JAVA_OPTS
```
We can now set our options by using export on the CLI, or via the console. Let's switch to the console by going to PUBLICIP:9990 and logging in as the admin user with the password pinehead.
Challenge

Set a Fixed Heap Size
1. Navigate to the Configuration section of the HAL Management Console, then select System Properties.
2. Click Add on the right-hand side of the table.
3. Set the Name filed to JAVA_OPTS and the Value field to -Xms1024M -Xmx1024M.
4. Click Add
Challenge

Enable the G1 Garbage Collector and Aggressive Optimizations
The additional options we need also need to be set under the JAVA_OPTS variable. Select JAVA_OPTS from the table and click Edit. Enable both the garbage collection and aggressive optimizations. The full expression should be:
```
-Xms1024M -Xmx1024M -XX:+UseG1GC -XX:+AggressiveOpts
```
Select Save.
Challenge

Confirm the Changes
1. Back on the CLI, open the standalone configuration file and search for JAVA_OPTS to confirm the changes:
```
vim /opt/jboss-eap/standalone/configuration/standalone.xml
```
Exit the CLI with exit.
1. Restart the server:
```
sudo systemctl restart jboss-eap-rhel
```

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