JRMP, or Java Remote Method Protocol is the Java technology-specific protocol for looking up and referencing remote objects. It is a wire level protocol running at the level under Remote Method Invocation (RMI) and over TCP/IP.
JRMP is a Java-specific, stream-based protocol; compare with RMI-IIOP. The RMI-IIOP which exposes Java objects to CORBA ORBs is an alternative to JRMP. In contrast to the RMI-IIOP, the JRMP is a protocol for Java-to-Java remote calls, which makes it language dependent and means that both client and server must use java objects. However, many application server vendors have developed their own protocols for use with RMI which claim to offer advantages over both IIOP and JRMP.