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POjava project won't compile class referencing enum depending on source code order
 

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  1. POjava project won't compile class referencing enum depending on source code order
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    <p>I have an situation where some Java 1.6 sources won't compile in Maven and only compile in javac when I specify sources in a certain order.</p> <p>pom.xml is bare-bones but specifies <code>-source</code> and <code>-target</code> of 1.6:</p> <pre><code> &lt;build&gt; &lt;plugins&gt; &lt;plugin&gt; &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt; &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt; &lt;version&gt;3.1&lt;/version&gt; &lt;configuration&gt; &lt;source&gt;1.6&lt;/source&gt; &lt;target&gt;1.6&lt;/target&gt; &lt;/configuration&gt; &lt;/plugin&gt; &lt;/plugins&gt; &lt;/build&gt; </code></pre> <p>ComputeOperation.java</p> <pre class="lang-java prettyprint-override"><code>package test.domain; public interface ComputeOperation&lt;T&gt; { public T compute(T arg1, T arg2); } </code></pre> <p>Computations.java</p> <pre class="lang-java prettyprint-override"><code> package test.domain; public enum Computations implements ComputeOperation&lt;Integer&gt; { ADD { @Override public Integer compute(Integer arg1, Integer arg2) { return arg1 + arg2; } }, SUBTRACT { @Override public Integer compute(Integer arg1, Integer arg2) { return arg1 - arg2; } } } </code></pre> <p>App.java</p> <pre class="lang-java prettyprint-override"><code>package test.app; import test.domain.*; public class App { public static void main( String[] args ) { System.out.println(Computations.ADD.compute(1, 1)); } } </code></pre> <p>Maven build fails as follows (<a href="https://gist.github.com/noahlz/5645995" rel="nofollow noreferrer">full debug log here</a>):</p> <pre><code>[ERROR] COMPILATION ERROR : [INFO] ------------------------------------------------------------- [ERROR] /home/nzucker/projects/maven-test/src/main/java/test/app/App.java:[7,44] cannot find symbol symbol : method compute(int,int) location: class test.domain.Computations [INFO] 1 error </code></pre> <p>Plain old <code>javac</code> compilation fails succeeds if App.java comes before Computations.java:</p> <pre><code>[nzucker:maven-test]$ javac -source 1.6 -target 1.6 -g -d target/classes src/main/java/test/app/App.java src/main/java/test/domain/Computations.java src/main/java/test/domain/ComputeOperation.java src/main/java/test/app/App.java:7: cannot find symbol symbol : method compute(int,int) location: class test.domain.Computations System.out.println(Computations.ADD.compute(1, 1)); ^ 1 error </code></pre> <p>But the build <em>succeeds</em> if I put App.java last in the input sources:</p> <pre><code>[nzucker:maven-test]$ javac -source 1.6 -target 1.6 -g -d target/classes src/main/java/test/domain/Computations.java src/main/java/test/domain/ComputeOperation.java src/main/java/test/app/App.java [nzucker:maven-test]$ java -cp target/classes/ test.app.App 2 </code></pre> <p>Finally, if I change the <code>import</code> in App.java to a static import, compilation succeeds:</p> <pre><code>package test.app; import static test.domain.Computations.*; public class App { public static void main( String[] args ) { System.out.println(ADD.compute(1, 1)); } } </code></pre> <p>Questions:</p> <p>I am aware of "<a href="https://stackoverflow.com/questions/9505857/workaround-for-javac-compilation-order-bug-in-maven">Workaround for javac compilation order bug in maven</a>" - <strike>so my question is <em>why</em> is this occurring? Is this a true defect in Maven? If so, what is the JIRA issue if so?</p> <p>Also, why does compilation fail? I thought that javac resolve dependencies and compilation order between classes during a pre-processing phase? I guess I was wrong? Is there a specification that covers this?</strike></p> <p>Ok, the other question I linked to has a response that points to a bug in Java 1.6. The answer is to upgrade to Java 1.7 or implement a work-around.</p>
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    1. COThe `ADD` class it's on the fisrt level on package test.domain?
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    2. COFixed. I just fail at SO markdown.
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    3. COI am ok with closing question. I would just ask that it not be deleted.
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