seems like a versioning problem to me. are you sure you used all the right versions of the jars?
getting groovy-eclipse, gmaven, and eclipse all working together seems to be pretty tricky at the present. once you've got a project created with
mvn archetype:generate, as awhitford mentions, this site will show you a few of the tweaks you'll need to make it work.
gmaven's stub creation for java files interferes with groovy-eclipse, hence the section on that page about commenting out stub creation. however, i went with the method mentioned in the comments for the relevant bug (gmaven-61) and created multiple executions for the gmaven plugin, like so:
<build> <plugins> <plugin> <groupid>org.codehaus.groovy.maven</groupid> <artifactid>gmaven-plugin</artifactid> <version>1.0-rc-3</version> <!-- http://jira.codehaus.org/browse/gmaven-61 --> <executions> <execution> <id>default-cli</id> <goals> <goal>compile</goal> <goal>testcompile</goal> </goals> </execution> <execution> <id>stubsonly</id> <goals> <goal>generatestubs</goal> <goal>generateteststubs</goal> </goals> </execution> </executions> </plugin> </plugins> </build>
i'm still not certain myself that this is clean for both pure maven usage as well as within eclipse, but it at least got me to the point where i stopped spending hours trying to get anything to work and got me coding on my actual project.
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