Chapter 1: Before You Install EAServer

JDK versions

EAServer requires version 1.3.1 of the Java Development Kit (JDK) from HP. You can optionally run servers with JDK 1.4.1 instead. By default, JDK 1.3.1 and the optional JDK versions that you select are installed with EAServer. You can also configure the installation to use an existing version, as long as it is of the required patch level as listed in Table 1-1.

**Table 1-1: JDK versions and required patch levels**
JDK version	Patch level	Notes
1.3.1	12	This version is required to run EAServer Manager, jagtool, and other tools. It is also the default for running servers.
1.4.1	03	This version is required to run the Web services toolkit. With JDK 1.4, the client and server virtual machines (VMs) are supported; the classic VM is not.

To verify the version and patch level, change to the bin directory of the JDK installation and run the following command:

java -version

To configure the installation to use an existing JDK installation, choose the Custom installation type when running the installer. After you select the desired JDK versions, the installer prompts you to specify whether to use an existing JDK and for the location of the JDK.

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