Java Service Wrapper is a third party utility RHQ uses to install the RHQ Server and RHQ Agent as a Microsoft Windows Service (so it can run as a boot time background service). Our usage of Java Service Wrapper is configured with the files rhq-server-wrapper. Conf and rhq-agent-wrapper.conf.
Java Service Wrapper is not used by RHQ on any UNIX platform - it is only used when RHQ is running on Microsoft Windows (and only when you elect to install the server or agent as a Windows Service). If you want to install the server and/or agent as a boot time background service on UNIX, you install their respective wrapper scripts in your UNIX platform's appropriate init. D location.
See Running the Server and Running the Agent if you want to learn more about installing them as boot time background services. More.
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