Developing and Debugging Shopizer in Eclipse with Maven and Jetty

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Developing and Debugging Shopizer in Eclipse with Maven and Jetty

posted Sep 24, 2014, 9:09 PM by Haris Hashim [ updated Feb 10, 2015, 11:45 PM ]

!!! NOTE 1: This is still a work in progress with lots of sharp edges that cuts and bleed ;) !!!

Note 2: Prerequisite to follow shopizer documentation Build The Application.

Contents
1 Starting Up
2 SM CORE
3 SM SHOP
4 Cleaning Up
5 Run and Debugging

Starting Up

This steps are done using Eclipse Luna.

Good to make sure that latest m2e plugin is installed in eclipse.

Git clone of the project give you sm-core and sm-shop folder.

Install AspectJ Development tool (credit to Arjan reply in StackOverflow here). Use the Menu, Help->Install New Software.

Then install AspectJ Maven connector. Use the Menu, Windows->Preferences. On the preferences windows expand Maven and select Discovery in the tree list on left hand side. After that click Open Catalog button, find AspectJ and put a check mark on it. Click finish to start installation.

Using same step as installing AspectJ Maven connector, but this time install m2e-apt.

The code base actually have 2 sub project. sm-core mentioned above is actually the library part. While sm-shop is web app part that going to be run by jetty.

SM CORE

Import into eclipse as maven project.There is an error in the sm-core pom.xml file for maven-apt-plugin. Modifying maven-apt-plugin version to 1.0.4 make this error go away.

<plugin>
<groupId>com.mysema.maven</groupId>
<artifactId>maven-apt-plugin</artifactId>
<version>1.0.4</version>
...
</plugin>

Also add maven-source-plugin to sm-core pom file.

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-source-plugin</artifactId>

<id>attach-sources</id>

<goals>

</goals>

</execution>

</executions>

</plugin>

This plugin is for debugging. Without it browsing sm-core sources from sm-shop using eclipse will result to source not found.

Only do the following step if bellow error is encountered in sm-core.pom.

You need to run build with JDK or have tools.jar on the classpath.
If this occures during eclipse build make sure you run eclipse under  JDK as well 
(com.mysema.maven:apt-maven-plugin:1.0.6:process:default:generate-sources)

This StackOverflow page discus the issue. Solution that work for me is by eis that suggest setting -vm option in eclipse.ini to a specific jdk which is described in this StackOverflow page or even better this wiki page.

SM SHOP

Modify sm-shop pom to include jetty-maven-plugin. This is the magic that will allow us to run and debug Shopizer using jetty.

<plugin>
<groupId>org.mortbay.jetty</groupId>
       <artifactId>jetty-maven-plugin</artifactId>
       <version>8.1.15.v20140411</version>
       <configuration>
<scanIntervalSeconds>5</scanIntervalSeconds>
       </configuration>
</plugin>

The scanIntervalSeconds configuration above is for debugging later. This allow java code to be change and debugged without restarting jetty. Functionality called hot swapping.

Test this using mvn jety:run in a terminal/console which result to following errors:

Error:

java.lang.NoClassDefFoundError: org/apache/el/ExpressionFactoryImpl

Adding the following to pom.xml solve the problem as per this link.

<groupId>org.apache.tomcat</groupId>

<artifactId>tomcat-jasper-el</artifactId>

</dependency>

Java.lang.Exception: DEBUG -- CLOSE BY CLIENT STACK TRACE

DEBUG com.mchange.v2.resourcepool.BasicResourcePool: Preparing to destroy resource: com.mchange.v2.c3p0.impl.NewPooledConnection@26e866ca
DEBUG com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool: Preparing to destroy PooledConnection: com.mchange.v2.c3p0.impl.NewPooledConnecti
on@26e866ca
DEBUG com.mchange.v2.c3p0.impl.NewPooledConnection: com.mchange.v2.c3p0.impl.NewPooledConnection@26e866ca closed by a client.
java.lang.Exception: DEBUG -- CLOSE BY CLIENT STACK TRACE