Plz help me out with class loader problem
hai forum members,
I have a code which loads class files from local disk.
It works fine with some classes ,
But i get this exception when i am selecting certain other class files
I am using jdeveloper.
Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: Filter (wrong name: project1/Filter)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at com.jutframe.JavaUnitTester.selectClass_actionPerformed(JavaUnitTester.java:449)
at com.jutframe.JavaUnitTester$7.actionPerformed(JavaUnitTester.java:338)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.AbstractButton.doClick(AbstractButton.java:302)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1000)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1041)
at java.awt.Component.processMouseEvent(Component.java:5488)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3093)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1766)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
-
JFileChooser jfilechooser=new JFileChooser();
Filterclass filter=new Filterclass();
//Set selection mode for file chooser
jfilechooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
//set file filter
jfilechooser.setFileFilter(filter);
int returnVal = jfilechooser.showOpenDialog(this);
if(returnVal == JFileChooser.APPROVE_OPTION)
{
try
{
String str = jfilechooser.getSelectedFile().getName();
String parent=jfilechooser.getSelectedFile().getParent();
// Create a File object on the root of the directory containing the class file
File file =new File(parent);
// Convert File to a URL
URL url = file.toURL();
URL[] urls =new URL[]{url};
// Create a new class loader with the directory
ClassLoader cl =new URLClassLoader(urls);
StringTokenizer st =new StringTokenizer(str,".");
String s = st.nextToken ();
Class c = cl.loadClass(s);//ERROR IS SHOWN IN THIS PARTICULAR LINE
Object instance=c.newInstance();
--
--
please help me trace my mistake.
thank you all.
