Red Hat DIRECTORY SERVER 7.1 Installation Manual page 27

Chapter 2. Computer System Requirements 21
Make sure the JRE package is executable, then run the file. For example:
chmod a+x j2re-1_4_2_04-solaris-sparc.sh
./j2re-1_4_2_05-solaris-sparc.sh
This extracts a new JRE directory called j2re.1.4.2_05.
When you first run setup, you are asked for the JRE path. Fill in the absolute path as follows:
/export/redhat/jre/j2re1.4.2_04
If you are doing a silent installation, set the JRE path as an environment variable before running setup:
export NSJRE=/tmp/java/jre/j2re1.4.2_04