What do I need to use roo with an existing Maven Project?
If I type roo in the project home, I get a NullpointerException:
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/_/ |_|\____/\____/ 1.0.0.RC2 [rev 321]
Welcome to Spring Roo. For assistance press TAB or type "hint" then hit ENTER.
NullPointerException at org.springframework.roo.project.Dependency.<init>( Dependency.java:95)
Apparently all plugins (including default) require a groupId.
Making sure all plugins had a groupId resolved this.
FYI: This is the plugin that was causing my problem:
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.0.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
Yes you are correct. This is because Roo parses the pom in order to anaylyse your exisiting dependencies (this way we can make sure that Roo won't install duplicate dependencies). I am not aware of any case where you don't need a groupId, so I am surprised this plugin worked before including the groupId. Looking at your specific plugin the usage example also has a groupId in use:
http://maven.apache.org/plugins/mave...gin/usage.html
Cheers,
Stefan
I noticed https://jira.springsource.org/browse/ROO-319 was logged for this bug. I have just marked it as resolved, as I encountered this problem when working on ROO-287 and already committed the necessary fix in SVN revision 339. It will therefore be included in Roo 1.0.0.RC3.