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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.

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/*
 * Copyright 2005 Joe Walker
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.directwebremoting.jsonrpc;

/**
 * Various constants from the JSON-RPC spec:
 * http://groups.google.com/group/json-rpc/web/json-rpc-1-2-proposal
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface JsonRpcConstants
{
    /**
     * Parse error
     * Invalid JSON. An error occurred on the server while parsing the JSON text
     */
    public static int ERROR_CODE_PARSE = -32700;

    /**
     * Invalid Request: The received JSON not a valid JSON-RPC Request
     */
    public static int ERROR_CODE_INVALID = -32600;

    /**
     * Method not found.
     * The requested remote-procedure does not exist / is not available.
     */
    public static int ERROR_CODE_NO_METHOD = -32601;

    /**
     * Invalid method parameters.
     */
    public static int ERROR_CODE_BAD_PARAMS = -32602;

    /**
     * Internal JSON-RPC error.
     */
    public static int ERROR_CODE_INTERNAL = -32603;

    /**
     * Reserved for implementation-defined server-errors.
     */
    public static int ERROR_CODE_SERVER = -32000;
}