com.agapsys.sevlet.container.StacktraceErrorHandler Maven / Gradle / Ivy

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/*
 * Copyright 2015 Agapsys Tecnologia Ltda-ME.
 *
 * 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 com.agapsys.sevlet.container;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.ErrorHandler;

public class StacktraceErrorHandler extends ErrorHandler {
	// CLASS SCOPE =============================================================
	private static final String ATTR_EXCEPTION = "javax.servlet.error.exception";
	
	private static String getStackTrace(Request baseRequest) {
		Throwable throwable = (Throwable) baseRequest.getAttribute(ATTR_EXCEPTION);
		if (throwable != null) {
			StringWriter stringWriter = new StringWriter();
			throwable.printStackTrace(new PrintWriter(stringWriter));
			return stringWriter.toString();
		} else {
			return null;
		}
	}
	// =========================================================================
	
	// INSTANCE SCOPE ==========================================================
	@Override
	public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException {
		String stackTrace = getStackTrace(baseRequest);
		if (stackTrace != null) {
			response.getWriter().print(getStackTrace(baseRequest));
		} else {
			super.handle(target, baseRequest, request, response);
		}
	}
	// =========================================================================
}