eclipse-tomcat debug
The Java Debugger
The Java Debugger (jdb) is a dynamic, controlled, assignment-based 
debugging tool. It helps find and fix bugs in the Java language programs 
both locally and on the server. To use jdb in a J2EE application server you 
must first launch it with debugging enabled and attach to the server from the 
debugger through a JPDA port (Default port is 1044).
The default JPDA options for J2EE servers are as follows:
-Xdebug -
The jdb parameters specify the way debugger will operate. For instance 
transport=dt_socket instructs the JVM that the debugger connections will be 
made through a socket while the address=1044 parameter informs it that 
the port number will be 1044. Similarly, if you substitute suspend=y , the 
JVM starts in suspended mode and stays suspended until a debugger is 
attached to it. This may be helpful if you want to start debugging as soon as 
the JVM starts.
Debugging WebLogic
Debugging WebLogic is no different than debugging any other Java remote 
application. You need to make sure to launch it with the required debugging 
arguments and attach a debugger. In the case of WebLogic 8.1, you need 
to add these arguments to the startup script. WebLogic comes with several 
launch scripts (*.sh and *.cmd) under BEA_HOME/weblogic81/server/bin.
Locate startWSL.cmd and add the following variable DEBUG_OPTS:
set DEBUG_OPTS = -Xdebug -Xrunjdwp:transport= 
Next, insert the new variable to the WebLogic startup command, after "%
JAVA_HOME%binjava" and preferably before the other options.
Your startup script should look like: 
MEM_ARGS% %JAVA_OPTIONS%-Dweblogic.Name=%
Dweblogic.ProductionModeEnabled= %PRODUCTION_MODE%- "%WL_HOME%serverlibweblogic.policy" 
Debugging JBoss
Same as WebLogic, except that you need to change run.bat/ located 
under JBOSS_HOME/bin.
Linux users should see something similar to this:
 $ cd /var/jboss4/bin
 $ sh ./ 
 JBoss Bootstrap Environment
 JBOSS_HOME: /var/jboss4
 JAVA: /usr/java/j2sdk1.4.2_06/bin/java
 JAVA_OPTS: -server -Xms128m -Xmx128m
 DEBUG_OPTS = -Xdebug -Xrunjdwp:transport= 
 CLASSPATH: /var/jboss4/bin/run.jar:/usr/java/j2sdk1.4.2_06/lib/tools.jar
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