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POImport-on-demand declaration with subpackages only
 

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    <p>Related : <a href="https://stackoverflow.com/questions/878685/how-can-i-compile-import-pack-with-ant-javac-when-there-are-no-such-classes">How can I compile &quot;import pack.*&quot; with ant/javac, when there are no such classes?</a></p> <p>Suppose we have the given package structure</p> <pre><code>parent | ---a ---b </code></pre> <p>where the package <code>parent</code> only contains the two subpackges <code>a</code> and <code>b</code> (no class is under the package <code>parent</code>).</p> <p>The code <code>import parent.*</code>, situated in a package other than <code>parent</code>, compiled with Maven (i.e. <code>javac</code>) throws a compile-time error. The error is:</p> <blockquote> <p>package parent does not exist</p> </blockquote> <p>I looked into the Java Language Specification about such a case (import-on-demand declaration where no types are actually imported). <a href="https://docs.oracle.com/javase/specs/jls/se8/html/jls-7.html#jls-7.5.2" rel="nofollow noreferrer">Paragraph 7.5.2 of the JLS</a> about import-on-demand declaration does not seem to specify this behavior.</p> <p>Is this a bug of <code>javac</code>? I am not asking how to circumvent the compile error. I would like to know why <code>javac</code> throws an error because I cannot find any reference in the JLS that it should; leading me to believe that this might be a bug.</p> <p>I tested with JDK 1.4, 1.6, 1.7 and 1.8, the error is the same.</p> <p>As a side note, there is no compile error with the same code in Eclipse (tested with Eclipse Indigo, Juno, Luna and Mars).</p> <p>NB: I encountered this behaviour when "mavenizing" an (old) existing project that only relied on the Eclipse compiler. It took me a while to identify that this was the root cause of the compile error I was getting.</p>
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    1. COIs it just academic interest or it has any practical value? For me Eclipse behaves stupid by allowing nonsensical statement.
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    2. COThis is just out of pure interest. I actually never use import-on-demand declaration and prefer single-type-import.
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      1. USTunaki
 

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