Hi,
Are you using no-jre version?
1. you can use Jre agent, it has Java. hyperic-hqee-agent-x86-64-linux-5.8.1.tar.gz or hyperic-hq-agent-x86-64-linux-5.8.1.tar.gz
2. you can set your HQ_JAVA_HOME value to your java, for example: export HQ_JAVA_HOME="opt/....."
Thanks,
Yaron