ApplicationObjectInputStream.java

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package com.sun.faces.renderkit;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;
import java.util.HashMap;
import java.util.Map;


/**
 * An ObjectInputStream that can deserialize objects relative to the current
 * application's class loader.  In particular, this class works around 
 * deserialization problems when the JSF JARs are shared (i.e. the 
 * classloader has no access to application objects).
 */
public class ApplicationObjectInputStream extends ObjectInputStream {

    // Taken from ObjectInputStream to resolve primitive types
    private static final Map<String,Class<?>> PRIMITIVE_CLASSES =
          new HashMap<>(9, 1.0F);

    static {
        PRIMITIVE_CLASSES.put("boolean", boolean.class);
        PRIMITIVE_CLASSES.put("byte", byte.class);
        PRIMITIVE_CLASSES.put("char", char.class);
        PRIMITIVE_CLASSES.put("short", short.class);
        PRIMITIVE_CLASSES.put("int", int.class);
        PRIMITIVE_CLASSES.put("long", long.class);
        PRIMITIVE_CLASSES.put("float", float.class);
        PRIMITIVE_CLASSES.put("double", double.class);
        PRIMITIVE_CLASSES.put("void", void.class);
    }
   
    public ApplicationObjectInputStream() throws IOException, 
            SecurityException {
        super();
    }
    
    public ApplicationObjectInputStream(InputStream in) throws IOException {
        super(in);
    } 

    @Override
    protected Class<?> resolveClass(ObjectStreamClass desc)
    throws IOException, ClassNotFoundException {
        
        // When the container is about to call code associated with a 
        // particular web application, it sets the context classloader to the 
        // web app class loader. We make use of that here to locate any classes 
        // that the UIComponent may hold references to.  This won't cause a 
        // problem to locate classes in the system class loader because 
        // class loaders can look up the chain and not down the chain.
        String name = desc.getName();
        try {
            return Class.forName(name,
                                 true,
                                 Thread.currentThread().getContextClassLoader());
        } catch (ClassNotFoundException cnfe) {
            Class<?> c = PRIMITIVE_CLASSES.get(name);
            if (c != null) {
                return c;
            }
            throw cnfe;
        }

    }
}