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POMaven compiler plugin always detecting a set of sources as "stale"
 

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  1. POMaven compiler plugin always detecting a set of sources as "stale"
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    <p>FIXED: this is a <a href="https://issues.apache.org/jira/browse/MCOMPILER-209" rel="noreferrer">known bug</a> in maven-compiler-plugin 3.1</p> <p>I am converting an ant-based build of a 1000+ java-sources project to maven. So far so good, but every time launch <code>mvn compile</code> it recompiles everything (instead of reusing old classes)</p> <p>Using <code>mvn -X compile</code> reports that</p> <pre><code>[DEBUG] Stale source detected: /project_path/src/main/java/package_path/AFile1.java [DEBUG] Stale source detected: /project_path/src/main/java/package_path/AFile2.java ... </code></pre> <p>(<strong>only for files in a certain package</strong>, which is possibly unreferenced from the rest of the code; not my sources, I am just trying to mavenize the build)</p> <p>Compilation does not fail, and classes with updated timestamps are being generated at</p> <pre><code>/project_path/target/classes/package_path/AFile1.class /project_path/target/classes/package_path/AFile2.class ... </code></pre> <p>However, when looking at timestamps, the java files have not changed since yesterday, and the class files are current. Why are these sources determined to be stale? How can I debug this issue?.</p> <p>It is a drag to have to recompile 1k+ files even when no changes have occurred...</p> <hr> <p>Sample output:</p> <pre><code>$ mvn clean compile [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building MyProject 1.9.0-SNAPSHOT [INFO] ------------------------------------------------------------------------ [WARNING] The POM for net.sourceforge:jffmpeg:jar:1.1.0 is missing, no dependency information available [INFO] [INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ my-project --- [INFO] Deleting /project_path/target [INFO] [INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ my-project --- [debug] execute contextualize [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] skip non existing resourceDirectory /project_path/src/main/resources [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ my-project --- [INFO] Changes detected - recompiling the module! [INFO] Compiling 1162 source files to project_path/target/classes .... [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 11.215s [INFO] Finished at: Tue Jul 30 12:42:25 CEST 2013 [INFO] Final Memory: 25M/429M [INFO] ------------------------------------------------------------------------ $ mvn compile [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building MyProject 1.9.0-SNAPSHOT [INFO] ------------------------------------------------------------------------ [WARNING] The POM for net.sourceforge:jffmpeg:jar:1.1.0 is missing, no dependency information available [INFO] [INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ my-project --- [debug] execute contextualize [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] skip non existing resourceDirectory /project_path/src/main/resources [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ my-project --- [INFO] Changes detected - recompiling the module! [INFO] Compiling 1162 source files to /project_path/target/classes ... [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 12.140s [INFO] Finished at: Tue Jul 30 12:42:44 CEST 2013 [INFO] Final Memory: 22M/379M [INFO] ------------------------------------------------------------------------ </code></pre>
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    1. COProviding you don't do a `mvn clean compile` Maven will only compile the source files that have changed; see - http://stackoverflow.com/questions/11772747/how-does-maven-compile-only-the-modified-java-files
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    2. COThat is what I thought. However, it is not what I get...
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    3. CO@tucuxi: Add an answer :)
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      1. USDaniel
 

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