SAP JCo and the VM Container
Use
● The Java architecture in the SAP system uses both the classic Java EE architecture and a Virtual Machine Container (VMC) that is used in certain functions as an alternative to the existing Java EE layer and Sun’s Java Virtual Machine.
● With the newly implemented VMC driver in the RFC interface, the VMC container is now able to communicate by RFC with work processors belonging to other servers.
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● Work process administration in the VMC is based on the principles of ABAP architecture. In comparison to Java EE architecture, the work processes in the VMC are more easily scalable and offer greater error tolerance. For Java application development in the Application Server, this change in the communication architecture is not visible, however, and does not necessitate any additional activities.
Architecture
During communication between ABAP and Java applications in an Application Server, the Java work processes are managed in the VM container and transferred to the relevant ABAP application by SAP JCo.
For the transferal of data from the VMC using RFC, a special VMC driver has been implemented in the RFC interface. The RFC data flow is forwarded via this driver.
More Information
Administration of Work Processes in the VMC
In-Process and Out-of-Process Communication in the VMC Driver
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For detailed information about the structure and functions of the Virtual Machine Containers, see:
