If you need to integrate Microsoft BizTalk Server (BTS) 2004 with other applications and data sources, you're going to need some kind of adapter. BTS 2004 ships with a few, including the file adapter and the Web services adapter. Other adaptors, especially ones used to integrate BTS with popular enterprise software, are available from third-party vendors. However, if you need a JMS (Java Messaging Service) adapter, or one that supports J2EE facilities such as JNDI (Java Naming and Directory Interface), JAAS (Java Authentication and Authorization Service), and EJBs (Enterprise Java Beans), you're probably going to have to build one. This article shows you how to construct a custom adapter that allows BTS to integrate with JMS. You can also use these techniques to construct other kinds of adapters, including ones for Java APIs that come with custom applications, or simply call Java libraries from BizTalk Server orchestrations.