001/*
002 * Copyright 2022-2026 Revetware LLC.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.soklet;
018
019import org.jspecify.annotations.NonNull;
020
021import javax.annotation.concurrent.NotThreadSafe;
022
023import static java.util.Objects.requireNonNull;
024
025/**
026 * Signals an intentional client-visible JSON-RPC error from an MCP handler.
027 *
028 * <p>Unexpected application failures should be allowed to propagate normally
029 * so Soklet can map them to its safe internal-error response. A handler's
030 * exception passes through {@link McpHandlerContinuation#proceed()} unchanged.
031 * An {@link McpHandlerInterceptor} may inspect and rethrow that exact object
032 * during the same invocation to preserve the intentional error, or return a
033 * method-compatible recovery result. An interceptor-authored exception,
034 * including a new instance carrying the same error, a wrapper, or an exception
035 * retained from an earlier invocation, fails closed as an unexpected failure.
036 *
037 * @author <a href="https://www.revetkn.com">Mark Allen</a>
038 */
039@NotThreadSafe
040public final class McpJsonRpcException extends RuntimeException {
041        private static final long serialVersionUID = 1L;
042        @NonNull
043        private final McpJsonRpcError error;
044
045        /**
046         * Creates an exception carrying an intentional JSON-RPC error.
047         *
048         * @param jsonRpcError client-visible JSON-RPC error
049         */
050        public McpJsonRpcException(@NonNull McpJsonRpcError jsonRpcError) {
051                super("MCP handler produced a JSON-RPC error.");
052                this.error = requireNonNull(jsonRpcError);
053        }
054
055        /** @return client-visible JSON-RPC error */
056        @NonNull
057        public McpJsonRpcError getError() {
058                return this.error;
059        }
060}