eclipse-tomcat debug
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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 -
Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=1044
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=
dt_socket,address=1044,server=y,suspend=n
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:
"%JAVA_HOME%binjava" %DEBUG_OPTS% %JAVA_VM% %
MEM_ARGS% %JAVA_OPTIONS%-Dweblogic.Name=%
SERVER_NAME% -Dweblogic.management.username= %WLS_USER%
-Dweblogic.management.password= %WLS_PW% -
Dweblogic.management.server= %ADMIN_URL%-
Dweblogic.ProductionModeEnabled= %PRODUCTION_MODE%-
Djava.security.policy= "%WL_HOME%serverlibweblogic.policy"
weblogic.Server
Debugging JBoss
Same as WebLogic, except that you need to change run.bat/run.sh located
under JBOSS_HOME/bin.
Linux users should see something similar to this:
$ cd /var/jboss4/bin
$ sh ./run.sh
=========================================================
================
JBoss Bootstrap Environment
JBOSS_HOME: /var/jboss4
JAVA: /usr/java/j2sdk1.4.2_06/bin/java
JAVA_OPTS: -server -Xms128m -Xmx128m -Dprogram.name=run.sh
DEBUG_OPTS = -Xdebug -Xrunjdwp:transport=
dt_socket,address=1044,server=y,suspend=n
CLASSPATH: /var/jboss4/bin/run.jar:/usr/java/j2sdk1.4.2_06/lib/tools.jar
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