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Enabling Large Pages for JBoss EAP

The JBoss Enterprise Application Server allows users to deploy and manage Java applications — and part of this management is making sure our Java apps run smoothly. For memory-intensive applications, this can mean enabling optimization features such as large pages, which locks pages in memory for faster retrieval — albeit at the expense of a non-application performance. In this lab, we enable large pages and ensure there are no memory issues in our application.

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Path Info

Level

Beginner

Duration

15m

Last updated

Aug 23, 2025

Challenge

Enable Huge Pages via the Kernel
To enable huge pages from the kernel, we can use the sysctl command:
```
sudo sysctl -w vm.nr_hugepages=1
```

Challenge

Enable Large Pages via JBoss EAP

Move into the JBoss EAP home directory:

cd /opt/jboss-eap/

Open the standalone configuration:

sudo vim standalone/configuration/standalone.xml

Add the following under extensions:

    <system-properties>
        <property name="JAVA_OPTS" value="-XX:+UseLargePages"/>
    </system-properties>

Challenge

Restart the Service
1. Restart JBoss EAP:
```
sudo systemctl restart jboss-eap-rhel
```
1. Grep the server log for startup warnings:
```
cat standalone/log/server.log | grep WARNING
```

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