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package org.apache.catalina.util;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;
/**
* Custom subclass of <code>ObjectInputStream</code> that loads from the
* class loader for this web application. This allows classes defined only
* with the web application to be found correctly.
*
* @author Craig R. McClanahan
* @author Bip Thelin
* @version $Revision: 1.2 $, $Date: 2005/12/08 01:28:15 $
*/
public final class CustomObjectInputStream
extends ObjectInputStream {
/**
* The class loader we will use to resolve classes.
*/
private ClassLoader classLoader = null;
/**
* Construct a new instance of CustomObjectInputStream
*
* @param stream The input stream we will read from
* @param classLoader The class loader used to instantiate objects
*
* @exception IOException if an input/output error occurs
*/
public CustomObjectInputStream(InputStream stream,
ClassLoader classLoader)
throws IOException {
super(stream);
this.classLoader = classLoader;
}
/**
* Load the local class equivalent of the specified stream class
* description, by using the class loader assigned to this Context.
*
* @param classDesc Class description from the input stream
*
* @exception ClassNotFoundException if this class cannot be found
* @exception IOException if an input/output error occurs
*/
public Class resolveClass(ObjectStreamClass classDesc)
throws ClassNotFoundException, IOException {
try {
return Class.forName(classDesc.getName(), false, classLoader);
} catch (ClassNotFoundException e) {
try {
// Try also the superclass because of primitive types
return super.resolveClass(classDesc);
} catch (ClassNotFoundException e2) {
// Rethrow original exception, as it can have more information
// about why the class was not found. BZ 48007
throw e;
}
}
}
}