I would like to have the maven eclipse plugin regenerate my .classpath whenever a build is run, and I did so by using the following configuration:
<!--
Generate a new .classpath each time the build is run, but don't try
to download sources or javadocs
-->
<profile>
<id>elipse-update</id>
<activation>
<file>
<exists>.classpath</exists>
</file>
</activation>
<build>
<plugins>
<plugin>
<artifactId>maven-eclipse-plugin</artifactId>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>eclipse</goal>
</goals>
<configuration>
<downloadSources>false</downloadSources>
<downloadJavadocs>false</downloadJavadocs>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
For some reason, this causes the maven jetty plugin to fail with ClassNotFoundException errors (it complains about all sorts of Spring classes not being there). Of course, it worked without a hit when I didn't have the maven eclipse plugin installed. Here's an example of what I'm talking about:
$ mvn jetty:run
[INFO] Scanning for projects...
...
[INFO] Starting jetty 6.1.22 ...
2010-02-11 20:53:08.984:INFO::jetty-6.1.22
2010-02-11 20:53:09.109:WARN::Could not instantiate listener org.springframework.web.context.ContextLoaderListener
java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at org.codehaus.classworlds.RealmClassLoader.loadClassDirect(RealmClassLoader.java:195)
at org.codehaus.classworlds.DefaultClassRealm.loadClass(DefaultClassRealm.java:255)
at org.codehaus.classworlds.DefaultClassRealm.loadClass(DefaultClassRealm.java:274)
at org.codehaus.classworlds.RealmClassLoader.loadClass(RealmClassLoader.java:214)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
Of course, if I delete that eclipse plugin section, I can run jetty as expected:
$ mvn jetty:run
[INFO] Scanning for projects...
...
Feb 11, 2010 8:55:28 PM org.springframework.web.context.ContextLoader initWebApplicationContext
INFO: Root WebApplicationContext: initialization completed in 1672 ms
2010-02-11 20:55:28.687:INFO::Started [email protected]:8080
[INFO] Started Jetty Server
[INFO] Starting scanner at interval of 5 seconds.
Some things I know:
- Yes, I only activate this profile if the .classpath is present. This seems counter-intuitive, but I have a reason: I have another profile that activates when the .classpath is absent which runs the eclipse plugin with the options for downloading source code and javadocs set to true. I don't want this to happen each build, so I created a separate plugin config for when the classpath is already there.
- Yes, I could simply create properties that held the values of the options I wish to change instead of specifying the entire plugin config again. In that case, I would just set a eclipse.downloadSources property to true or false depending on the presence of the classpath and have a single plugin definition in the regular build section.
Any advice? This is a strange problem.
Thanks, LES