[ 
http://jira.codehaus.org/browse/MNG-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_126499
 ] 

Brian Fox commented on MNG-3438:
--------------------------------

The enforcer plugin can be used to detect these issues. I updated the pom like 
below and it works (note i removed checkstyle because it wasn't building):

{noformat}
<?xml version="1.0" encoding="UTF-8"?>

<!--
 *
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * Lesser General Public License for more details.
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 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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 *
-->

<project xmlns="http://maven.apache.org/POM/4.0.0"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/maven-v4_0_0.xsd";>
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.xpn.xwiki.platform.tools</groupId>
        <artifactId>xwiki-tools</artifactId>
        <version>8-SNAPSHOT</version>
    </parent>
    <artifactId>xwiki-xar-plugin</artifactId>
    <name>XWiki Platform - Tools - XAR Plugin</name>
    <version>1.10-SNAPSHOT</version>
    <packaging>maven-plugin</packaging>
    <description>XWiki Platform - Tools - XAR Plugin</description>
    <dependencies>
        <dependency>
            <groupId>org.apache.maven</groupId>
            <artifactId>maven-plugin-api</artifactId>
            <version>2.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.maven</groupId>
            <artifactId>maven-project</artifactId>
            <version>2.0.4</version>
        </dependency>   
        <dependency>
            <groupId>org.codehaus.plexus</groupId>
            <artifactId>plexus-archiver</artifactId>
            <version>1.0-alpha-9</version>
            <exclusions>
                <exclusion>
                    <groupId>org.codehaus.plexus</groupId>
                    <artifactId>plexus-container-default</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.codehaus.plexus</groupId>
                    <artifactId>plexus-component-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.codehaus.plexus</groupId>
            <artifactId>plexus-io</artifactId>
            <version>1.0-alpha-2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.maven</groupId>
            <artifactId>maven-model</artifactId>
            <version>2.0.4</version>
        </dependency>
        <dependency>
            <groupId>org.apache.maven</groupId>
            <artifactId>maven-artifact</artifactId>
            <version>2.0</version>
        </dependency>
        <dependency>
            <groupId>dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>1.6.1</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>

                <artifactId>maven-enforcer-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>enforce</goal>
                        </goals>
                        <id>ensure-no-container-api</id>
                        <configuration>
                            <rules>
                                <bannedDependencies>
                                    <excludes>
                                        
<exclude>org.codehaus.plexus:plexus-component-api</exclude>
                                    </excludes>
                                    <message>The new containers are not 
supported. You probably added a dependency that is missing the 
exclusions.</message>
                                </bannedDependencies>
                                <!-- 
<requirePluginVersions><banSnapshots>false</banSnapshots></requirePluginVersions>-->
                            </rules>
                            <fail>true</fail>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>


{noformat}

> IIncompatibleClassChangeError
> -----------------------------
>
>                 Key: MNG-3438
>                 URL: http://jira.codehaus.org/browse/MNG-3438
>             Project: Maven 2
>          Issue Type: Bug
>          Components: General
>    Affects Versions: 2.0.9
>            Reporter: Vincent Massol
>             Fix For: 2.0.9
>
>
> This is happening with 2.0.9-SNAPSHOT built on 5th of March 2008:
> {noformat}
> [INFO] 
> ------------------------------------------------------------------------
> [INFO] Building XWiki Platform - Applications - Selenium
> [INFO]    task-segment: [clean, install]
> [INFO] 
> ------------------------------------------------------------------------
> [INFO] [clean:clean]
> [INFO] Deleting directory 
> /Users/vmassol/dev/xwiki/trunks/xwiki-platform-applications/selenium/target
> [INFO] [remote-resources:process {execution: xwiki-license-resources}]
> [INFO] [resources:resources]
> [INFO] Using default encoding to copy filtered resources.
> [WARNING] Attempting to build MavenProject instance for Artifact 
> (com.xpn.xwiki.platform.tools:xwiki-xar-plugin:1.10-20080305.115158-11) of 
> type: maven-plugin; constructing POM artifact instead.
> [INFO] [xwiki-xar:xar]
> [INFO] Generating package.xml descriptor at 
> [/Users/vmassol/dev/xwiki/trunks/xwiki-platform-applications/selenium/target/classes/package.xml]
> [FATAL ERROR] com.xpn.xwiki.tool.xar.XarMojo#execute() caused a linkage error 
> (java.lang.IncompatibleClassChangeError) and may be out-of-date. Check the 
> realms:
> [FATAL ERROR] Plugin realm = 
> app0.child-container[com.xpn.xwiki.platform.tools:xwiki-xar-plugin]
> urls[0] = 
> file:/Users/vmassol/.m2/repository/com/xpn/xwiki/platform/tools/xwiki-xar-plugin/1.10-SNAPSHOT/xwiki-xar-plugin-1.10-SNAPSHOT.jar
> urls[1] = 
> file:/Users/vmassol/.m2/repository/org/codehaus/plexus/plexus-utils/1.1/plexus-utils-1.1.jar
> urls[2] = 
> file:/Users/vmassol/.m2/repository/org/codehaus/plexus/plexus-archiver/1.0-alpha-9/plexus-archiver-1.0-alpha-9.jar
> urls[3] = 
> file:/Users/vmassol/.m2/repository/org/codehaus/plexus/plexus-component-api/1.0-alpha-15/plexus-component-api-1.0-alpha-15.jar
> urls[4] = 
> file:/Users/vmassol/.m2/repository/org/codehaus/plexus/plexus-classworlds/1.2-alpha-6/plexus-classworlds-1.2-alpha-6.jar
> urls[5] = 
> file:/Users/vmassol/.m2/repository/org/codehaus/plexus/plexus-io/1.0-alpha-1/plexus-io-1.0-alpha-1.jar
> urls[6] = file:/Users/vmassol/.m2/repository/dom4j/dom4j/1.6.1/dom4j-1.6.1.jar
> urls[7] = 
> file:/Users/vmassol/.m2/repository/xml-apis/xml-apis/1.0.b2/xml-apis-1.0.b2.jar
> [FATAL ERROR] Container realm = plexus.core
> urls[0] = 
> file:/Applications/apache-maven-2.0.9-SNAPSHOT/lib/maven-2.0.9-SNAPSHOT-uber.jar
> urls[1] = 
> file:/Users/vmassol/.m2/repository/org/codehaus/plexus/plexus-utils/1.1/plexus-utils-1.1.jar
> urls[2] = 
> file:/Users/vmassol/.m2/repository/com/xpn/xwiki/platform/tools/xwiki-xar-handlers/1.9-SNAPSHOT/xwiki-xar-handlers-1.9-SNAPSHOT.jar
> [INFO] 
> ------------------------------------------------------------------------
> [ERROR] FATAL ERROR
> [INFO] 
> ------------------------------------------------------------------------
> [INFO] null
> [INFO] 
> ------------------------------------------------------------------------
> [INFO] Trace
> java.lang.IncompatibleClassChangeError
>         at 
> org.codehaus.plexus.archiver.zip.AbstractZipArchiver.createArchiveMain(AbstractZipArchiver.java:318)
>         at 
> org.codehaus.plexus.archiver.zip.AbstractZipArchiver.execute(AbstractZipArchiver.java:242)
>         at 
> org.codehaus.plexus.archiver.AbstractArchiver.createArchive(AbstractArchiver.java:673)
>         at com.xpn.xwiki.tool.xar.XarMojo.performArchive(XarMojo.java:129)
>         at com.xpn.xwiki.tool.xar.XarMojo.execute(XarMojo.java:90)
>         at 
> org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451)
>         at 
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:575)
>         at 
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:507)
>         at 
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:479)
>         at 
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:331)
>         at 
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:292)
>         at 
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:143)
>         at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:331)
>         at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:124)
>         at org.apache.maven.cli.MavenCli.main(MavenCli.java:285)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>         at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:585)
>         at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
>         at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
>         at 
> org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
>         at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
> {noformat}
> Note that this is not happening with 2.1-SNAPSHOT.

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