jp.terasoluna.fw.util.ExceptionUtil.java Source code

Introduction

Here is the source code for jp.terasoluna.fw.util.ExceptionUtil.java

Source

/*
 * Copyright (c) 2007 NTT DATA Corporation
 *
 * 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 jp.terasoluna.fw.util;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * ??
 * 
 * <p>
 *  ???????<br>
 *  ??????????
 *  ?????
 *  ???????????
 *  ??????????
 *  
 *  <strong>ExceptionUtil?</strong><br>
 *  <code><pre>
 *  
 *  try {
 *     
 *  } catch (Exception e) {
 *      // ??
 *      log.error("error-message", ExceptionUtil.getStackTrace(e));
 *  }
 *  
 * </pre></code>
 * </p>
 * 
 */
public final class ExceptionUtil {

    /**
     * 
     */
    private static Log log = LogFactory.getLog(ExceptionUtil.class);

    /**
     * ServletException???????????
     * ???????
     */
    private static final String SERVLET_EXCEPTION_NAME = "javax.servlet.ServletException";

    /**
     * ServletException???????
     * Servlet ??????????????
     */
    private static final String GET_ROOT_CAUSE = "getRootCause";

    /**
     * ?????
     * 
     * <p>
     *  ??????????????
     *  ????????
     *  ???getRootCause()????????ServletException??
     * </p>
     *
     * @param throwable 
     * @return ???
     */
    public static String getStackTrace(Throwable throwable) {
        StringBuilder sb = new StringBuilder();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        while (throwable != null) {
            baos.reset();
            throwable.printStackTrace(new PrintStream(baos));
            sb.append(baos.toString());

            //throwable?Class??
            Class<? extends Throwable> throwableClass = throwable.getClass();

            // ServletException ?? getRootCause ?
            if (SERVLET_EXCEPTION_NAME.equals(throwableClass.getName())) {
                try {
                    //throwable = ((ServletException) throwable).getRootCause()
                    //Class??????
                    Method method = throwableClass.getMethod(GET_ROOT_CAUSE);
                    throwable = (Throwable) method.invoke(throwable);
                } catch (NoSuchMethodException e) {
                    //???????
                    log.error(e.getMessage());
                    throwable = null;
                } catch (IllegalAccessException e) {
                    //?????????
                    log.error(e.getMessage());
                    throwable = null;
                } catch (InvocationTargetException e) {
                    //?????
                    log.error(e.getMessage());
                    throwable = null;
                }

            } else {
                throwable = throwable.getCause();
            }
        }
        return sb.toString();
    }

}