Configure the JVM

Operating Systems: i5/OS
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Configure the JVM

As part of configuring an application server, you might define settings that enhance the way your operating system uses of the Java virtual machine (JVM).

Overview

The JVM is an interpretive computing engine responsible for running the byte codes in a compiled Java program. The JVM translates the Java byte codes into the native instructions of the host machine. The application server, being a Java process, requires a JVM in order to run, and to support the Java applications running on it. JVM settings are part of an application server configuration.

To view and change the JVM configuration for an application server's process, use the Java virtual machine page of the administrative console or use wsadmin to change the configuration through scripting.

Procedure

In the administrative console, click Servers > Application Servers >server. Then, under Server Infrastructure, click > Java and Process Management > Process Definition .
Select Java Virtual Machine.
Specify values for the JVM settings as needed and click OK.
Click Save on the console task bar.
Restart the application server.

Example

Configuring application servers for UCS Transformation Format provides an example that involves specifying a value for the Generic JVM Arguments property on the Java virtual machine page to enable UTF-8 encoding on an application server. Enabling UTF-8 allows multiple language encoding support to be used in the administrative console.

Configuring JVM sendRedirect calls to use context root provides an example that involves defining a property for the JVM.

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Caching classes previously loaded by a user class loader

Running classes using JVM direct execution

Java virtual machine settings

Configuring JVM sendRedirect calls to use context root

Java Virtual machine custom properties

Related information

Migrating to Java 2 Standard Edition (J2SE) 5