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JBREFLECT-5 - Implementing generics in JavassistClassInfo
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reply from <a href="http://community.jboss.org/people/kabir.khan%40jboss.com">Kabir Khan</a> in <i>JBoss Microcontainer Development</i> - <a href="http://community.jboss.org/message/539766#539766">View the full discussion</a>
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<div class="jive-rendered-content"><p>2 - classloader for parameterized type</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I posted this last night right after my "1 - other problem", but could not see it again today?!?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Anyway, for a test still using SomeSignature and SomeValue, but now uses the lazy feature where I do something along the lines of</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>public</b></font> <font color="navy"><b>void</b></font> testClasses() <font color="navy"><b>throws</b></font> Throwable
<font color="navy">{</font>
   generateClasses();
   ClassInfo info = (Classinfo)getTypeInfoFactory().getTypeInfo(SomeSignature.class);
 
   MethodInfo mi = info.getDeclaredMethod(<font color="red">"signature"</font>, <font color="navy"><b>new</b></font> TypeInfo[0]);
 
   ClassInfo returnInfo = mi.getReturnType(); <font color="darkgreen">//Constructs the parameterized class info internally</font>
   TypeInfo[] args = returnInfo.getActualTypeArguments(); <font color="darkgreen">//* Lazily loads the type arguments</font>
<font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This fails with the call to returnInfo.getActualTypeArguments()</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code">java.lang.IllegalStateException: java.lang.ClassNotFoundException: org.jboss.test.classinfo.test.JavassistParameterizedClassInfoClassLoaderArgumentsTestCaseWithSignature
     at org.jboss.reflect.plugins.javassist.JavassistTypeInfoFactoryImpl.getTypeInfo(JavassistTypeInfoFactoryImpl.java:840)
     at org.jboss.reflect.plugins.javassist.JavassistTypeInfoFactoryImpl.createTypeInfoForTypeArgument(JavassistTypeInfoFactoryImpl.java:898)
     at org.jboss.reflect.plugins.javassist.JavassistParameterizedClassInfo.getActualTypeArguments(JavassistParameterizedClassInfo.java:115)
   ....
Caused by: java.lang.ClassNotFoundException: org.jboss.test.classinfo.test.JavassistParameterizedClassInfoClassLoaderArgumentsTestCaseWithSignature
     at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:315)
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:330)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:398)
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:247)
     at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactoryImpl.resolveComplexTypeInfo(IntrospectionTypeInfoFactoryImpl.java:434)
     at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactoryImpl.getTypeInfo(IntrospectionTypeInfoFactoryImpl.java:390)
     at org.jboss.reflect.plugins.introspection.IntrospectionTypeInfoFactory.getTypeInfo(IntrospectionTypeInfoFactory.java:54)
     at org.jboss.reflect.plugins.javassist.JavassistTypeInfoFactoryImpl.delegateToIntrospectionImplementation(JavassistTypeInfoFactoryImpl.java:620)
     at org.jboss.reflect.plugins.javassist.JavassistTypeInfoFactoryImpl.get(JavassistTypeInfoFactoryImpl.java:547)
     at org.jboss.reflect.plugins.javassist.JavassistTypeInfoFactoryImpl.get(JavassistTypeInfoFactoryImpl.java:454)
     at org.jboss.reflect.plugins.javassist.JavassistTypeInfoFactoryImpl.get(JavassistTypeInfoFactoryImpl.java:411)
     at org.jboss.reflect.plugins.javassist.JavassistTypeInfoFactoryImpl.getTypeInfo(JavassistTypeInfoFactoryImpl.java:836)
     ... 23 more
</code></pre><p>The reason is that I am using the classloader of the raw type (i.e. Set) to load up this parameterized type, but obviously SomeValue cannot be found there. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>One way around this would be in mi.getReturnType() when looking up/creating/caching the parameterized class info to use the classloader of mi.getDeclaringClass().getClassLoader(), which should be able to see all the classes involved. However, I am still stuck on which classloader to use for my previous post.</p></div>
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