Openjms
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OpenJMS is one of the major providers of Java Message Service API, which basically implementates Sun Microsystems' Java Message Service API 1.1 Specification. The current release is OpenJMS 0.7.7-alpha-3.
Java Message Service is an asynchronous communication mechanism in the distributed system field. It is very helpful in the situation where the distributed components are loosely coupled. Another popular distributed communication technology is Remote Method Invocation (RMI), which is tightly coupled and requires an application to know a remote application's methods.