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POmaven 3 dependency plugin - inconsistent result
 

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  1. POmaven 3 dependency plugin - inconsistent result
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    <p>I am migrating my project from maven 2 (2.2.1) to maven 3 (3.1.0) and I am having some issues with jar versions. When I tried to track down the problem, I experienced some inconsistent results from <em>dependency plugin</em> which confused me.</p> <p>When I tried the following commands in <strong>maven 3</strong>:</p> <pre><code>mvn dependency:tree -Dincludes=commons-codec </code></pre> <p>the results was:</p> <pre><code>[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ xxx --- [INFO] com.xxx.yyy:zzz:war:2.6-SNAPSHOT [INFO] \- net.sourceforge.jwebunit:jwebunit-htmlunit-plugin:jar:2.2:test [INFO] \- net.sourceforge.htmlunit:htmlunit:jar:2.5:test [INFO] \- commons-codec:commons-codec:jar:1.3:compile [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS </code></pre> <p>so the result suggest <strong>commons-codec-1.3.jar</strong> will be used. (maven 3 does include commons-codec-1.3.jar when packing).</p> <p>However, if I add the option (-Dverbose) to the command </p> <pre><code>mvn dependency:tree -Dincludes=commons-codec -Dverbose </code></pre> <p>the result will be </p> <pre><code>[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ xxx --- [INFO] com.xxx.yyy:zzz:war:2.6-SNAPSHOT [INFO] +- net.sourceforge.jwebunit:jwebunit-htmlunit-plugin:jar:2.2:test [INFO] | \- net.sourceforge.htmlunit:htmlunit:jar:2.5:test [INFO] | +- commons-httpclient:commons-httpclient:jar:3.1:test [INFO] | | \- (commons-codec:commons-codec:jar:1.2:test - omitted for conflict with 1.3) [INFO] | \- (commons-codec:commons-codec:jar:1.3:compile - scope updated from test; omitted for duplicate) [INFO] \- xxx.yyy.zzz.core:www-core:jar:2.6-SNAPSHOT:compile [INFO] +- org.apache.httpcomponents:httpclient:jar:4.2.2:compile [INFO] | \- commons-codec:commons-codec:jar:1.6:compile [INFO] \- xxx.yyy.zzz.security:datasecurity:jar:2.0:compile [INFO] \- (commons-codec:commons-codec:jar:1.3:compile - omitted for conflict with 1.6) [INFO] ------------------------------------------------------------------------ </code></pre> <p>The second result suggests that the version <strong>1.2</strong> and <strong>1.3</strong> will be omitted due to conflict, and maven will use <strong>1.6</strong>. Apparently it was not the case since <strong>maven 3</strong> packaged <strong>commons-codec-1.3.jar</strong> in the war file. </p> <p>Why did the plugin in maven 3 suggest different dependencies in two cases (It should not as -Dverbose should only show which dependencies omitted and why)? Is it a bug or am I missing something?</p> <p>It is worth to note that <strong>maven 2</strong> will package with <strong>commons-codec-1.6.jar</strong>.</p> <p>P/s:</p> <ul> <li>Since version 2.5 of the Maven Dependency Plugin, dependency:tree works with Maven 3 - <a href="https://stackoverflow.com/questions/7425910/maven3-how-do-i-found-dependency-resolution-mvn-depedencytree-does-not-wor">Maven3 - How do I found dependency resolution? ( mvn depedency:tree does not work for mvn3 )</a></li> <li>verbose: Whether to include omitted nodes in the serialized dependency tree. - <a href="http://maven.apache.org/plugins/maven-dependency-plugin/tree-mojo.html" rel="nofollow noreferrer">http://maven.apache.org/plugins/maven-dependency-plugin/tree-mojo.html</a></li> </ul>
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    1. COPlease take a look [here](https://cwiki.apache.org/confluence/display/MAVEN/Maven+3.x+Compatibility+Notes)
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    2. COThanks, I did. I understood that in some cases the dependencies can be resolved different between maven 2 & maven 3. What I don't understand is "Why the plugin suggested different dependencies in two cases just because of "-Dverbose").
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