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mapping of parameter and generic parameter types
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created by <a href="https://community.jboss.org/people/krichter">Kalle Richter</a> in <i>Javassist</i> - <a href="https://community.jboss.org/message/749365#749365">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hallo together,</p><p>I'm wondering whether the length of the arrays returned by <span>java.lang.reflect.Constructor.getParameterTypes() and </span>getGenericParameterTypes() should be always equal, i.e. whether it's a bug if they're not or whether I'm doing something wrong. You can run the program below and you'll understand my problem immediately <span> :) </span> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java"><font color="navy"><b>package</b></font> org.h9t2.javassistbug;
 
<font color="navy"><b>import</b></font> java.io.*;
<font color="navy"><b>import</b></font> java.util.List;
<font color="navy"><b>import</b></font> java.util.Set;
<font color="navy"><b>import</b></font> javassist.*;
 
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> App <font color="navy">{</font>
    <font color="navy"><b>private</b></font> <font color="navy"><b>final</b></font> <font color="navy"><b>static</b></font> ClassPool pool = ClassPool.getDefault();
 
    <font color="navy"><b>public</b></font> <font color="navy"><b>static</b></font> <font color="navy"><b>void</b></font> main( String[] args ) <font color="navy"><b>throws</b></font> NotFoundException, IOException, CannotCompileException
<font color="navy">{</font>       
        CtClass ctClass1 = pool.get(Clazz.class.getName());
        CtClass clone1 = createClone(ctClass1);
        CtConstructor cloneConstructor1 = clone1.getConstructors()[0];
        cloneConstructor1.addParameter(pool.get(List.class.getName()));
        cloneConstructor1.addParameter(pool.get(Set.class.getName()));
        Class clazz1 = clone1.toClass();
       
        System.out.println(clazz1.getConstructors()[0].getParameterTypes().length);
        System.out.println(clazz1.getConstructors()[0].getGenericParameterTypes().length);
  <font color="navy">}</font>
       
    <font color="navy"><b>private</b></font> <font color="navy"><b>static</b></font> <font color="navy"><b>int</b></font> classNameSuffix = 1;
       
    <font color="navy"><b>private</b></font> <font color="navy"><b>static</b></font> CtClass createClone(CtClass ctClass) <font color="navy"><b>throws</b></font> IOException <font color="navy">{</font>
        ByteArrayOutputStream classFileByteStream =<font color="navy"><b>new</b></font> ByteArrayOutputStream();
        DataOutputStream classFileStream = <font color="navy"><b>new</b></font> DataOutputStream(classFileByteStream);
        <font color="navy"><b>if</b></font>(ctClass.isFrozen()) <font color="navy">{</font>
            ctClass.defrost();
        <font color="navy">}</font>
        ctClass.getClassFile().write(classFileStream);
        <font color="navy"><b>byte</b></font>[] classFileBytes = classFileByteStream.toByteArray();
        InputStream classFileCloneStream = <font color="navy"><b>new</b></font> ByteArrayInputStream(classFileBytes);
        CtClass retValue = pool.makeClass(classFileCloneStream);
        retValue.setName(ctClass.getName()+<font color="red">"V"</font>+classNameSuffix++);
        <font color="navy"><b>return</b></font> retValue;
    <font color="navy">}</font>
<font color="navy">}</font>
 
<font color="navy"><b>class</b></font> Clazz <font color="navy">{</font>
 
    <font color="navy"><b>public</b></font> Clazz(
        List<Boolean> parameter0,
        <font color="navy"><b>int</b></font> b
    ) <font color="navy">{</font><font color="navy">}</font>
<font color="navy">}</font>
 
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Or is it the fault of my createClone method?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Any help or hint is appreciated</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Best regards</p></div>
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<p style="margin: 0;">Reply to this message by <a href="https://community.jboss.org/message/749365#749365">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in Javassist at <a href="https://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2062">Community</a></p>
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