ABAP dispatcher, JControl and ICM

[Former Member]

As we know,

If an ABAP instance is started with an additional Java instance, the ABAP dispatcher uses a signal to run a start command on the Startup and Control Framework, then JControl is started, and JLaunch is started by JControl.

In ABAP + Java stacks system, we start and stop Java instance with transaction SMICM.

In ABAP + Java stacks system, ICM is started and monitored by the ABAP dispatcher.

Until now, I am confused about their relationship. Please advise on following questions.

Q1: When ABAP dispatcher sends a signal to start/stop JControl, is there any relationship with ICM? I mean whether ICM takes a hand in?

Q2: How does ABAP dispatcher start and monitor ICM?

Thanks so much.

James

[Former Member · Accepted solution]

Hi

When ABAP dispatcher sends a signal to start/stop JControl, is there any relationship with ICM? I mean whether ICM takes a hand in?

No It would not as ICM is only responsible for Internet communications. It doesnot take care of the internal communications.

The communication between the ABAP and J2EE is due to JCO rfc that is present between them.

Please read these links: These would clear some confusions:

http://help.sap.com/saphelp_nw2004s/helpdata/en/84/54953fc405330ee10000000a114084/content.htm

http://help.sap.com/saphelp_nw04/helpdata/en/20/a2813a34872769e10000000a114084/frameset.htm

http://help.sap.com/saphelp_nw04/helpdata/en/20/a2813a34872769e10000000a114084/frameset.htm

[Former Member · Accepted solution]

In TADM12_1, there are following two sentences shown below.

"You can start SAP Web AS Java by starting SAP Web AS ABAP. This guarantees correct communication between ICM and SAP Web AS Java."

I can understand the first sentence that ABAP dispatcher starts up AS Java.

For the second sentence, "This guarantees correct communication between ICM and SAP Web AS Java." How to understand it? Is there any relationship between ICM and AS Java? Please advise.

Thanks.

James