A system for communication between a mainframe environment and a Java environment. The system can consist of a mainframe messaging system resident in the mainframe environment having an outbound and an inbound queue, a Java messaging system resident in the Java environment having an outbound and an inbound queue, and an intermediate messaging system coupled to the outbound and inbound queues of the mainframe messaging system and coupled to the outbound and inbound queues of the Java messaging system. The Java environment may be a J2EE environment. The mainframe messaging system may be an MQSeries messaging system and the Java messaging system may be a JMS messaging system. The outbound queue of the mainframe messaging system may communicate only messages directed to the Java environment and the inbound queue of the mainframe messaging system may communicate only messages directed from the Java environment.