The JVM Layer

A Java virtual machine (JVM), an implementation of the Java Virtual Machine Specification, interprets compiled java binary code for a computer's processor (or "hardware platform") so that it can perform a Java program's instructions. The Java Virtual Machine Specification defines an abstract -- rather than a real -- machine or processor. The Specification specifies an instruction set, a set of registers, a stack, a garbage heap, and a method area.

The tests associated with the jvm layer of WebLogic enables administrators to perform the following functions:

  • Assess the effectiveness of the garbage collection activity performed on the JVM heap
  • Monitor WebLogic thread usage
  • Evaluate the performance of the BEA JRockit JVM


Figure 1 : The tests associated with the JVM layer

Note that the WebLogic Work Manager test is not mapped to this layer, indicating that this test is not available for WebLogic versions 6, 7, and 8.

All the tests listed above are similar to the tests mapped to The JVM Layer of the Oracle WebLogic application server version 9 and above.