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POFinding an Enumeration Class using Reflection in Java
 

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  1. POFinding an Enumeration Class using Reflection in Java
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    <p>I think I need some help with finding an enumeration class within another class using reflection in Java. I have been battling with this for far too long now. I have read this as well as a number of other posts and they all make me believe it should work as below.</p> <pre><code>public class ModelActivity { public enum AttributeEnumeration { MODELID, MODELURGENCY, MODELDUEDATEANDTIME } public static void main(String[] args) { // Find the class with the given name String className = "ModelActivity"; Class modelClass = null; try { // Retrieve the Class with the given className... modelClass = Class.forName(className); } catch (ClassNotFoundException e) { throw new RuntimeException("Class by name '" + className + "' not found.", e); } // Find the AttributeEnumeration within the class String attributeEnumerationClassName = className + ".AttributeEnumeration"; Class attributeEnumerationClass = null; try { attributeEnumerationClass = Class.forName(attributeEnumerationClassName); } catch (ClassNotFoundException e) { throw new RuntimeException("Class by name '" + attributeEnumerationClassName + "' not found.", e); } } } </code></pre> <p>However, what actually happens is that the modelClass is found correctly, but the attributeEnumerationClass is not, that is, I get the second ClassNotFoundException as follows:</p> <pre><code>Exception in thread "main" java.lang.RuntimeException: Class by name 'ModelActivity.AttributeEnumeration' not found. at ModelActivity.main(ModelActivity.java:27) Caused by: java.lang.ClassNotFoundException: ModelActivity.AttributeEnumeration at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at ModelActivity.main(ModelActivity.java:25) </code></pre> <p>Could anyone please point the--probably obvious--mistake out to me. Thank you.</p>
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      1. USAbhinav Sarkar
 

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