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POWhy did maven suddenly start compiling with an older version of Java?
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  1. POWhy did maven suddenly start compiling with an older version of Java?
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    copied!<p>I've been developing in Java using maven for a few days now. Today I edited my pom.xml based on <a href="http://maven.apache.org/shared/maven-archiver/examples/classpath.html" rel="nofollow">these instructions</a>. Suddenly running <code>mvn compile</code> is giving me errors as if I was compiling with an older version of java. Stuff like:</p> <blockquote> <p>error: generics are not supported in -source 1.3</p> </blockquote> <p>Now I've paired my pom.xml back to its original content, and I'm <em>still</em> getting this error. I've done a <code>mvn clean</code> and deleted everything under target, and am still having this problem. </p> <p>Here's a snippet of maven running the compilation phase:</p> <pre> [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building bahToBeh 1.0-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-resources-plugin:2.3:resources (default-resources) @ bahToBeh --- [WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent! [INFO] skip non existing resourceDirectory /home/doug/lucid/bah-bio-demo/bahToBeh/src/main/resources [INFO] [INFO] --- maven-compiler-plugin:2.0.2:compile (default-compile) @ bahToBeh --- [INFO] Compiling 9 source files to /home/doug/lucid/bah-bio-demo/bahToBeh/target/classes [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 2.880s [INFO] Finished at: Thu Dec 20 13:52:06 EST 2012 [INFO] Final Memory: 7M/105M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile) on project bahToBeh: Compilation failure: Compilation failure: [ERROR] /home/doug/lucid/bah-bio-demo/bahToBeh/src/main/java/com/lucid/bahdemo/parsers/pm/MeshReader.java:[23,4] error: generics are not supported in -source 1.3 </pre> <p>And my paired-down pom.xml:</p> <pre><code>&lt;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"&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;groupId&gt;com.lucid&lt;/groupId&gt; &lt;artifactId&gt;bahToBeh&lt;/artifactId&gt; &lt;packaging&gt;jar&lt;/packaging&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;name&gt;bahToBeh&lt;/name&gt; &lt;url&gt;http://maven.apache.org&lt;/url&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;junit&lt;/groupId&gt; &lt;artifactId&gt;junit&lt;/artifactId&gt; &lt;version&gt;4.8.1&lt;/version&gt; &lt;scope&gt;test&lt;/scope&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;com.digitalpebble&lt;/groupId&gt; &lt;artifactId&gt;behemoth-core&lt;/artifactId&gt; &lt;version&gt;1.0&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.apache.hadoop&lt;/groupId&gt; &lt;artifactId&gt;hadoop-core&lt;/artifactId&gt; &lt;version&gt;1.0.4&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;marc4j&lt;/groupId&gt; &lt;artifactId&gt;marc4j&lt;/artifactId&gt; &lt;version&gt;2.4&lt;/version&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;/project&gt; </code></pre> <p>This had been working fine up until today. I'm not sure what setting I might have changed or how I could have munged up my project. I even double checked that the correct versions of java are installed:</p> <pre> doug@doug-VirtualBox:~/lucid/bah-bio-demo/bahToBeh$ java -version java version "1.7.0_10" Java(TM) SE Runtime Environment (build 1.7.0_10-b18) Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode) doug@doug-VirtualBox:~/lucid/bah-bio-demo/bahToBeh$ javac -version javac 1.7.0_10 </pre> <p>Here is JAVA_HOME</p> <pre> doug@doug-VirtualBox:~/lucid/bah-bio-demo/bahToBeh$ echo $JAVA_HOME /usr/lib/jvm/java-7-oracle </pre> <p>Maven <em>IS</em> using the pom.xml I think it is, if I run <code>mvn -X compile</code> I get:</p> <blockquote> <p>DEBUG] (f) project = MavenProject: com.lucid:bahToBeh:1.0-SNAPSHOT @ /home/doug/lucid/bah-bio-demo/bahToBeh/pom.xml</p> </blockquote> <p>I've also deleted my maven repo <code>rm -rf ~/.m2</code> and saw maven redownload everything same problem. </p> <p><strong>EDIT -- It suddenly works mysteriously</strong> I have no idea what happened, but suddenly now its working. I thought that one thing I changed was I commented out a test. I went and uncommented out the test and then ran <code>mvn compile</code> and this time it compiled. Some state somewhere was out-of-sync and now things magically work?</p> <p>I hate not knowing why my tools suddenly go wonky, so this is not an answer to the question, merely more information.</p> <p><strong>EDIT -- and it also just suddenly STOPPED working again</strong> Looks like fully specifying the version to compile works though, so dingding thats the winner.</p>
 

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