Web Servers andServer-Side Debugging

Jetty

• In this course we are using Maven Jetty Plugin for convenience

• Maven plugin configuration:

• To run Jetty execute from Maven Web project root:mvn jetty:run

<plugin><groupId>org.mortbay.jetty</groupId><artifactId>jetty-maven-plugin</artifactId><version>8.1.7.v20120910</version>

</plugin>

Enable remote debugging

• Set environment variable MAVEN_OPTS with value-Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n

• E.g. create a BAT file for running Jetty:

set MAVEN_OPTS=-Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=nmvn jetty:run

Debug configuration in Eclipse

> Run > Debug Configurations…

Debugging

1. Start Jetty

2. Launch Debug configuration in Eclipse

Debugging

3. Add breakpoint, e.g. in Servlet code and send HTTP request

4. Server will stop at breakpoint

Debugging

Tomcat

Download Tomcat

• Download the Apache Tomcathttp://tomcat.apache.org

• Un-zip the distribution file

• Deploy your application• Copy WAR file inside

<TOMCAT_HOME>\webapps

• Tomcat server can be started by executing BAT script <TOMCAT_HOME>\bin\startup.bat

Set up remote debugging

1. Stop Tomcat (Ctrl+C or close console window)

2. Open the startup script: startup.bat

3. Add the following lines at the first blank line in the file (around line 8)

set JPDA_ADDRESS=8787

set JPDA_TRANSPORT=dt_socket

4. Change the execute line at the end to include jpda startcall "%EXECUTABLE%" jpda start %CMD_LINE_ARGS%

5. Run the startup script to run Tomcat in debug mode

http://confluence.sakaiproject.org/display/BOOT/Setting+Up+Tomcat+For+Remote+Debugging

JBoss

Download JBoss

• Download the JBoss application server

https://www.jboss.org/jbossas/downloads/

• Un-zip the distribution file

• Deploy your application• Copy WAR file inside

<JBOSS_HOME>\server\workspace\deploy

• JBoss server can be started by executing BAT script <JBOSS_HOME>\bin\run.bat

Enable remote debugging

1. Stop JBoss (Ctrl+C or close console window)

2. Add or un-comment the following line in run.bat

rem JPDA options. Uncomment and modify asrem appropriate to enable remote debugging.set JAVA_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,

address=8787,server=y,suspend=n %JAVA_OPTS%

3. Create new “Remote Java Application” debug configuration in Eclipse:

Run Open Debug Dialog