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POJava class constant pool duplicates?
 

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    <p>I have decompiled a class with <code>javap</code> and I'm seeing some duplicates in the Constant Pool section, like this:</p> <pre><code> #19 = Class #350 // java/lang/StringBuilder ... Some other class constants here #318 = Class #350 // java/lang/StringBuilder </code></pre> <p>Methodrefs refer to only one of them:</p> <pre><code> #20 = Methodref #19.#351 // java/lang/StringBuilder."&lt;init&gt;":()V #22 = Methodref #19.#353 // java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; #24 = Methodref #19.#355 // java/lang/StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder; #25 = Methodref #19.#356 // java/lang/StringBuilder.toString:()Ljava/lang/String; #110 = Methodref #19.#445 // java/lang/StringBuilder.append:(I)Ljava/lang/StringBuilder; </code></pre> <p>Is this class correct according to <a href="http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html" rel="nofollow">The class File Format</a>? I thought that every Class is mentioned just once and referred later by it's index in the bytecode part.</p> <pre><code>$ javac -version javac 1.7.0_15 </code></pre> <p>An other strange thing is in the source of the class representing the Constant Pool in javac <a href="https://github.com/openjdk-mirror/jdk7u-langtools/blob/master/src/share/classes/com/sun/tools/javac/jvm/Pool.java#L98" rel="nofollow">Pool.java</a>. This states that it will not put an object into the the pool if it is already there (with a help of a HashMap). I wonder if the equals()/hashCode() methods of these classes are implmented correctly.</p>
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