[Solved]-debugging java application deployed in tomcat-eclipse

Steps to setup the tomcat Debugger with eclipse

Install the following things:

java 1.8+

eclipse EE version

download tomcat 8+

open eclipse and go to servers tab and add a new server(window-> show View-> Others -> Search Servers)

Mark your project as Dynamic web Project(Rightclick on Project-> project facets -> select Dynamic web module)

Export war (File-> Export-> search war -> select module and choose the path)

Run as -> Run on Server

Start the tomcat Server in Debug or Run Mode

check on localhost:8080

Debug worked for me. I was using tomcat 8, configured on centos 7. Debug port opened for me after changing 2 settings.

1. Open tomcat/conf/bin/startup.sh and added below lines

export JPDA_ADDRESS=8000
export JPDA_TRANSPORT=dt_socket

2. In the same file startup.sh, added jpda before start command.

exec "$PRGDIR"/"$EXECUTABLE" jpda start "$@"

Restart the tomcat. In eclipse go to Run>Debug configuration>Remote java application>Add host ip and port(8000) where tomcat is running. In my case i required to open 8000 through firewall too.

firewall-cmd --zone=public --permanent --add-port=8000/tcp
firewall-cmd --reload

Beside remote debugging, you can debug your app locally within eclipse if you added tomcat in eclipse. just start server and wright click your app and from debug menu hit debug on server. If you have multi module maven project, debug on server just shown up for module with war packaging. If you want debug a class that runs at startup by self, like methods that annotated with @PostConstruct, remember that you should increase server timeout. To do that, go to server view and double click on tomcat and in server preview tab, increase the timeout value.

1. Right Click on the project you want to debug and go to Debug As Menu and in the list click on Debug Configurations.

2. Then Double click on the Remote Java Application from left menu list. browse for the project u wanna add in then click apply.

   • Also change the listening port to 7999, then after you started the web app from your localhost click the debug button on the same window. Then any break point's will be hit after that.

yes, you need to configure tomcat to accept remote debugging connections. There is a FAQ on how to do it with various IDEs.

http://wiki.apache.org/tomcat/FAQ/Developing#Q2

Simply change the line in startup.bat (if you are using Windows)

from:

call "%EXECUTABLE%" start %CMD_LINE_ARGS%

to:

call "%EXECUTABLE%" jpda start %CMD_LINE_ARGS%

1. Create a new tomcat server

2. Create a new dynamic web project

Export war to tomcat server

3. Tomcat debug configuration(important), first double click tomcat server, then select "Use Tomcat installation (takes control of Tomcat installation)"

4. Add breakpoints

5. Run tomcat in debug mode

6. Test war in web browser

7. Edit source path

8. Debug source code in Tomcat

The war file is available here.