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From Apache Wiki <wikidi...@apache.org>
Subject [Tomcat Wiki] Update of "FAQ/Developing" by KonstantinKolinko
Date Tue, 30 Nov 2010 13:49:15 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Tomcat Wiki" for change notification.

The "FAQ/Developing" page has been changed by KonstantinKolinko.
The comment on this change is: Review the instructions. Rephrase some of them..
http://wiki.apache.org/tomcat/FAQ/Developing?action=diff&rev1=10&rev2=11

--------------------------------------------------

  
  The short answer is to add the following options when the JVM is started:
  {{{-Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n}}}
+ 
  There are a number of ways you can do this depending on how you normally start Tomcat:
+     * If you are using shell scripts to start Tomcat, start it with the following command:
{{{catalina jpda start}}}<<BR>>The above mentioned options can be provided by
setting certain environment variables, e.g. {{{JPDA_ADDRESS=8000}}} and {{{JPDA_TRANSPORT=dt_socket}}}.
See comments at the top of {{{catalina.sh}}} or {{{.bat}}} file for details.
      * If you run Tomcat using service wrapper, add the above JVM options before any other
JVM options. Check the documentation for the service to determine how to set JVM options.
-     * Set environment variables {{{JPDA_ADDRESS=8000}}} and {{{JPDA_TRANSPORT=dt_socket}}}
and then start tomcat using {{{catalina jpda start}}}.
      * If you start Tomcat from within an IDE, check the documentation for the IDE to determine
how to set the required JVM options.
  
  The port does not need to be set to 8000, it may be any value appropriate for your system.
@@ -25, +26 @@

  
  <<Anchor(Q2)>>'''How do I remotely debug Tomcat using Eclipse?'''
  
- This answer assumes that you have a project set up with all of the fixings and have some
idea of what you're doing in this respect. If not then thats really outside the scope of this
topic and more in the scope of you needing to go to [[http://eclipse.org|eclipse.org]] and
read up on how to use your ide, and maybe practice a little bit before you come back to this.
We are also going to assume you have some idea of what a debugger is and how to use one.
+ This answer assumes that you have a project set up and have some idea of what you are doing
in this respect. If not then that is really outside the scope of this topic and you need to
go to [[http://eclipse.org|eclipse.org]] and read up on how to use your IDE, and maybe practice
a little bit before you come back to this. We are also going to assume that you have some
idea of what a debugger is and how to use one.
  
- Make sure Tomcat is started and that your app is deployed and the sources, etc are all defined
as resources in your app. If you have a servlet or something, set a breakpoint where its sure
to hit on the next request. Go to "Run->Debug Configurations...". Click on "Remote Java
Applications", then click "New". Type in the title and all. Notice that port 8000 from the
Tomcat instructions. Save and run. Eclipse will connect to the VM that Tomcat is running under.
Wow, that was easy! Now go type the url to submit to your servlet or whatever in your browser.
Boom you hit the breakpoint right? Have fun!
+     * Make sure that Tomcat is started in remote debugging mode as described above and that
your app is deployed.
+     * Make sure that you have the sources for the code that you are trying to debug in your
IDE. For the libraries and for Tomcat itself you can "attach" the sources to the jar files:
open a class file and then click "Attach Source..." button.
+     * If you have a servlet or something, set a breakpoint where it is sure to hit on the
next request.
+     * Go to "Run->Debug Configurations...". Click on "Remote Java Applications", then
click "New". Type in the title. Note that port 8000 from the Tomcat instructions. Save and
run.
+     * Eclipse will connect to the JVM that Tomcat is running under. Wow, that was easy!
+ 
+ Now go type the url to submit to your servlet or whatever in your browser. Boom you hit
the breakpoint right? Have fun!
  
  
  <<Anchor(Q3)>>'''How do I remotely debug Tomcat using !NetBeans?'''
@@ -48, +55 @@

  
  <<Anchor(Q4)>>'''How do I change the monitoring interval for modified resources
and application reloading?'''
  
- Monitoring interval for application reloading is controlled by the `backgroundProcessorDelay`
property on `Context` element or on its parent containers: `Host` and `Engine`. See [[http://tomcat.apache.org/tomcat-6.0-doc/config/index.html|Tomcat
Configuration Reference]]. By default there is a single backgroung processing thread that
run by Engine. See its [[http://tomcat.apache.org/tomcat-6.0-doc/config/engine.html|configuration]]
for the default delay value.
+ Monitoring interval for application reloading is controlled by the `backgroundProcessorDelay`
property on `Context` element or on its parent containers: `Host` and `Engine`. See [[http://tomcat.apache.org/tomcat-6.0-doc/config/index.html|Tomcat
Configuration Reference]] for details. By default there is a single background processing
thread that is run by Engine. See its [[http://tomcat.apache.org/tomcat-6.0-doc/config/engine.html|configuration]]
for the default delay value.
  
  Interval that controls reloading of the changed JSP pages is set in the [[http://tomcat.apache.org/tomcat-6.0-doc/jasper-howto.html|Jasper
configuration]] in `web.xml`.
  

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