Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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.apache.nifi.registry.web.mapper; import org.apache.commons.lang3.StringUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.stereotype.Component; import javax.ws.rs.core.Response; import javax.ws.rs.ext.ExceptionMapper; import javax.ws.rs.ext.Provider; @Component @Provider public class IllegalStateExceptionMapper implements ExceptionMapper<IllegalStateException> { private static final Logger logger = LoggerFactory.getLogger(IllegalStateExceptionMapper.class); @Override public Response toResponse(IllegalStateException exception) { // log the error logger.info(String.format("%s. Returning %s response.", exception, Response.Status.CONFLICT)); if (logger.isDebugEnabled()) { logger.debug(StringUtils.EMPTY, exception); } return Response.status(Response.Status.CONFLICT).entity(exception.getMessage()).type("text/plain").build(); } }