Good day to you, Sha Jiang, Maven-dependency-plugin is the same as dependency-maven-plugin. The difference is that the former is from apache, while the latter is from codehaus. But they are basically one and the same.
However, maven-dependency-plugin is not yet released (though it is scheduled to be soon). Thus, if you don't want to use a snapshot version, use the codehause dependency-maven-plugin. Cheers, Franz jiangshachina wrote: > > Dear Wayne, > I had the same error. > With your hint, I removed some artifacts carefully and gradually. > Finally found that plugin maven:maven-dependency-plugin:1.0 caused the > matter. > Deleting the plugin would be OK. > > Additionally, if I don't specify plugin in POM, and run "mvn > dependency:copy-dependencies", > Maven will use plugin org.codehaus.mojo:dependency-maven-plugin:1.0. > Why Maven chose dependency-maven-plugin, but maven-dependency-plugin, by > default? > > a cup of Java, cheers! > Sha Jiang > > > Wayne Fay wrote: >> >> You can run with mvn -X ...to get more specific debugging information >> about what plugin is causing your problems etc. >> >> However, I'd just delete your local Maven2 repository >> (~/.m2/repository) and try again. Maven will automatically download >> the files it needs to construct your project. >> >> I'd suspect that you have simply managed to get a "bad" plugin JAR in >> your repo somewhere. Especially given that you're behind a firewall -- >> many people attempt to run Maven without configuring things at first >> and end up with corrupt JARs etc. Then they realize they need to >> configure their firewall proxy and the old corrupt artifacts are still >> waiting in your ~/.m2 repo to bite you in the future. >> >> Wayne >> >> On 11/3/06, bernulfiskus <[EMAIL PROTECTED]> wrote: >>> >>> Hi! >>> >>> I'm new with Maven - i created a simple sample-project, if i compile the >>> project i get a nullpointer-Exception! >>> I'm behind a firewall, a proxy is configured... >>> >>> Any Idea? >>> >>> Bernie >>> >>> >>> [INFO] Building Maven Default Project >>> [INFO] task-segment: [compile] >>> [INFO] >>> ---------------------------------------------------------------------------- >>> [DEBUG] maven-resources-plugin: resolved to version 2.2 from repository >>> central >>> [DEBUG] Retrieving parent-POM: org.apache.maven.plugins:maven-plugins::1 >>> for >>> project: null:maven-r >>> plugin:2.2 from the repository. >>> [DEBUG] Retrieving parent-POM: org.apache.maven:maven-parent::1 for >>> project: >>> org.apache.maven.plug >>> 1 from the repository. >>> [DEBUG] Retrieving parent-POM: org.apache:apache::1 for project: >>> org.apache.maven:maven-parent:pom >>> . >>> [INFO] >>> ------------------------------------------------------------------------ >>> [ERROR] FATAL ERROR >>> [INFO] >>> ------------------------------------------------------------------------ >>> [INFO] null >>> [INFO] >>> ------------------------------------------------------------------------ >>> [DEBUG] Trace >>> java.lang.NullPointerException >>> at >>> org.apache.maven.plugin.DefaultPluginManager.addPlugin(DefaultPluginManager.java:292) >>> >>> >>> -- >>> View this message in context: >>> http://www.nabble.com/Nullpointer-Exception-addPlugin-tf2567630s177.html#a7156625 >>> Sent from the Maven - Users mailing list archive at Nabble.com. >>> >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: [EMAIL PROTECTED] >>> For additional commands, e-mail: [EMAIL PROTECTED] >>> >>> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> >> >> > > -- View this message in context: http://www.nabble.com/Nullpointer-Exception-addPlugin-tf2567630s177.html#a7555609 Sent from the Maven - Users mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
