J2EE Startup and Control Framework 

Definition

The J2EE Startup and Control Framework consists of the JControl and Jlaunch programs. Jcontrol starts JLaunch and Jlaunch then starts the bootstrap Java program or a J2EE Cluster element (dispatcher or server process).

Use

The J2EE Startup and Control Framework is used to start, stop, and monitor a J2EE Instance.

The JControl program starts the J2EE instance as specified in the configuration file.

Structure

The Framework consists of the following components:

·        JControl starts, stops, and monitors the processes of the J2EE instance (usually one dispatcher and several server processes). The program implements the SAP signal handling for stopping the instance. JControl starts the Jlaunch processes.

·        Jlaunch starts a Java program. It loads the JVM into its own address space and is then the required cluster element. The program can receive notification from the Jcontrol process via the named pipes to stop the cluster element and then terminates if JControl stops running (forkemulation under Windows).

·        The Bootstrap JAVA program synchronizes the binary data from the J2EE database with the local file system and creates a property file that describes the processes of the J2EE instance.

The process is described in Starting, Controlling and Stopping a J2EE Instance.

Integration

The J2EE startup and control framework is called up in different ways according to the operating system and installation type:

·        Under Windows the SAP Management Console is used.  If you choose an instance containing a J2EE engine Action ® Start, the Jcontrol program is called.

·        Under UNIX platforms and OS/400 the scripts startsap and stopsap are used, which call the JControl program.  

·        If you start the J2EE instance using the SAP NetWeaver Developer Studio, the Studio calls this JControl.

See also:

Starting and Stopping the SAP System (UNIX)

Starting and Stopping the SAP System (UNIX)