Concurrency Utilities for Java EE 1.0
· This feature enables the creation of managed executors that allow applications to submit tasks to run concurrently, with thread context that is managed by the application server.It also enables the creation of managed thread factories to create threads that run with the threadcontext of the component that looks up the managed thread factory.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window concurrent-1.0-23.0.0.8.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.
