*J is a toolkit which serves two primary purposes:

• To facilitate the collection of dynamic execution data for
  Java programs
• To provide a framework for implementing analyses of this
  collected data quickly and easily

These two main goals are accomplished through the use of two
separate tools:

• The *J profiling agent collects event trace data from a
  Java program running in a Java Virtual Machine (JVM) which
  implements the Java Virtual Machine Profiler Interface
  (JVMPI)
• The *J trace analyzer framework reads and analyzes the
  traces produced by the agent, using either a built-in
  analyses or custom ones.

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