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POFor loop with generic collection fails to compile in Java 7
 

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  1. POFor loop with generic collection fails to compile in Java 7
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    <p>Maybe someone can explain the behaviour below. I know there were some generic type-handling changes from Java 6 to 7, but I couldn't find one to explain this.</p> <p>This is happening with this library:</p> <pre><code>&lt;dependency&gt; &lt;groupId&gt;org.apache.felix&lt;/groupId&gt; &lt;artifactId&gt;org.apache.felix.framework&lt;/artifactId&gt; &lt;version&gt;3.2.2&lt;/version&gt; &lt;/dependency&gt; </code></pre> <p>And the following demonstration code:</p> <pre><code>import org.apache.felix.framework.util.manifestparser.ManifestParser; ManifestParser manifestParser = new ManifestParser(null, null, null, null); for (Capability capability : manifestParser.getCapabilities()) { capability.toString(); } // where the signature of getCapabilities() is: // public List&lt;Capability&gt; getCapabilities() { return m_capabilities; } // and there are no other methods with similar signatures or names </code></pre> <p>This demo code compiles just fine with JDK 6 (x86, 1.6.0_45, 32-bit), but fails to compile with JDK 7 (x86, 1.7.0_25, 32-bit, same host):</p> <pre><code>// line number matches the for loop java: incompatible types required: org.apache.felix.framework.capabilityset.Capability found: java.lang.Object </code></pre> <p>After some head scratching, I have a workaround but no explanation. The following modification to the demo code compiles with JDK 7:</p> <pre><code>ManifestParser manifestParser = new ManifestParser(null, null, null, null); List&lt;Capability&gt; capabilities = manifestParser.getCapabilities(); for (Capability capability : capabilities) { capability.toString(); } </code></pre> <p>Why is this?</p>
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    1. COCan you show us the `ManifestParser` class declaration. For whatever reason this fails, I don't know why, but there is no such changes in generics from Java 6 to Java 7, which can make this fail. Either it will fail in both, or none.
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      1. USRohit Jain
    2. CODid you recompile the code after sdk change?
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    3. COIt probably has something to do with a compilation problem or SDK settings because I have try it with JDK 7 and the code compile without any warning.
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      1. POFor loop with generic collection fails to compile in Java 7
      1. USJean-Philippe Bond
 

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