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Full debugging support for a application with MyEclipse requires that the application server being used fully supports the JSR 45 (http://www.jcp.org/en/jsr/detail?id=45) specification. This specification allows for full debugging of any Java classes (Beans, Servlets, EJBs, etc.) as well as full debugging for JSP files. For application servers that don’t provide JSR 45 support, debugging for Java classes should still mostly work, but JSP debugging will not.
Some users have complained that certain servers that claim to support JSR 45 do a very poor job of debugging their JSPs, this is caused by those servers providing insufficient information in what is called a “source map” back to the debugger about the file being debugged. This makes it impossible for MyEclipse to accurately translate line and variable information during a debugging session.
The application server we usually encourage developers to use during development is Tomcat (a version of which is built into MyEclipse) or JBoss, if a full EJB container is necessary. Both fully support the JSR 45 specification and provide good debugging support.
