On Mon, Aug 30, 2010 at 10:59 AM, Raymond Feng <enjoyj...@gmail.com> wrote: > Hi, > > I just added a maven plugin [1] that can check and report duplicate > (potentially conflicting) classes from a list of jars within the dependency > graph or a directory. It will be useful to detect the classpath hell issue. > > The Tuscany maven-dependency-plugin checks and reports duplicate classes > among the list of jars within the maven dependency graph or under a directory > on the file system. > > The maven conflict resolution only handles different versions of the same > artifact (same groupId and same artifactId). In reality, there are artifacts > with different groupId and/or artifactId containing duplicate classes which > can be the same or different. These classes can lead to the classpath hell > issue where conflicting classes are on the same classpath. > > There is a similar effort in the official maven dependency plugin project to > add such function into the analyze goal. > > http://jira.codehaus.org/browse/MDEP-275 > > The Tuscany version has a few advantages over the prototype above: > * It groups duplicate classes under the list of artifacts > * It goes one step further to check the size and CRC of the class file and > marks the different cases in the report (potentially we can use BCEL to > further compare the two classes): > * X: the duplicate classes have different size (most likely different > versions) > * ?: the duplicate classes have the same size but different CRC (probably > the same version but were built separately) > * : the duplicate classes have the same size and CRC (most likely the same > version). > > To use the plugin, you can add the following section to the pom.xml: > > <plugin> > <groupId>org.apache.tuscany.maven.plugins</groupId> > <artifactId>maven-dependency-plugin</artifactId> > <version>1.0.0-SNAPSHOT</version> > <configuration> > <verbose>true</verbose> > </configuration> > <executions> > <execution> > <id>check-class-conflicts</id> > <phase>validate</phase> > <goals> > <goal>check-class-conflicts</goal> > </goals> > </execution> > </executions> > </plugin> > > Ideally, we can get this function into the official maven dependency plugin. > I'll start to work with the project to get that going. > > [1] > https://svn.apache.org/repos/asf/tuscany/maven-plugins/trunk/maven-dependency-plugin/ > > Thanks, > Raymond
I guess you would have more interest and people collaborating on this if you make it available in the maven sandbox [1][2]. [1] http://docs.codehaus.org/display/MAVEN/The+Maven+Sandbox+is+for+all+Apache+Committers! [2] https://svn.apache.org/repos/asf/maven/sandbox/trunk/ -- Luciano Resende http://people.apache.org/~lresende http://twitter.com/lresende1975 http://lresende.blogspot.com/
