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h1. Verifying the Correct JDK Version to Support Access Manager

The information on this page concerns you only if the following software is installed or will be installed on this machine:

* Linux operating system
* Access Manager 7.1, to be installed with the Java Enterprise System (Java ES) 5 Update 1 installer
* Java 6 (Java Development Kit 1.6) or later has been installed previously on this machine

This issue does not apply on Solaris systems.

For more information about the compatibility between Access Manager, the Java version, and a Communications Suite installation, see [Communications Suite 6 Update 1 Compatibility Issues|Communications Suite 6 Update 1 Compatibility Issues#6743356].

h2. To Verify the Correct Java Development Kit (JDK) Version to Support Access Manager 7.1

The Java ES 5 Update 1 (JES5u1) installer cannot successfully deploy Access Manager 7.1 if Java Development Kit (JDK) 1.6 or later is installed. You can use the following command to verify the currently installed release.

In a terminal window, as {{root}} run the following command.
\\
{noformat}
rpm -qa jdk
{noformat}
{info:title=Note}A default installation of Red Hat Enterprise Linux 3 or 4 will return no output to this command.{info}

If the output of the command is *{{jdk-1.6.<version>}}*, the JDK version will need to be downgraded prior to deploying Access Manager 7.1.

This can be achieved by downloading and installing *JDK 5.0 Update 16* from the following URL:

[http://java.sun.com/products/archive/j2se/5.0_16/index.html]

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