Maven Dependancy Exclusion

Consider the case where you are using the Log4J2 however the dependency you are trying to add for CXF or something brings in log4j1.x.

You are missing a bunch of new functionality because logger still refers to old version.

Obvious  you need to remove the Transitive dependency but how to identify the transitive dependencies

mvn dependency:tree -Dverbose -Dincludes=log4j:log4j

[groupId]:[artifactId]:[type]:[version]

http://maven.apache.org/plugins/maven-dependency-plugin/examples/filtering-the-dependency-tree.html

will show you the dependency-tree, but only the relevant excerpt. Using this information you can now add your exclusions to the affected pom.xml files

Eg:

<!-- CXF Dependancies --><dependency>
    <groupId>org.apache.cxf</groupId>
    <artifactId>cxf-java2wadl-plugin</artifactId>
    <version>${cxf-version}</version>
    <exclusions>
        <exclusion>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
        </exclusion>
    </exclusions>
</dependency>


Then you can enforce that the dependency needs to be some version and above 



<build>



    <plugins>



        <plugin>



            <groupId>org.apache.maven.plugins</groupId>



            <artifactId>maven-enforcer-plugin</artifactId>



            <version>1.3.1</version>



            <executions>



                <execution>



                    <id>enforce-version</id>



                    <goals>



                        <goal>enforce</goal>



                    </goals>



                    <configuration>



                        <rules>



                            <bannedDependencies>



                                <excludes>



                                    <!-- exclude all versions lower than 1.2.17-->                                   



                                    <exclude>log4j:log4j:[0.0,1.2.17)</exclude>



                                </excludes>



                            </bannedDependencies>



                        </rules>



                    </configuration>



                </execution>



            </executions>



        </plugin>



    </plugins>



</build>













Finally run a Maven Site plugin to generate the Dependancy site.







https://maven.apache.org/plugins/maven-site-plugin/








IF you follow the steps it POM should be clean by now.

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