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JSF components and utilities that can be used with any JSF implementation. This library is compatible with both JSF1.1 and JSF1.2; however for JSF1.2 users there is an alternative build of Tomahawk available that takes advantage of JSF1.2 features to offer some additional benefits.

There is a newer version: 1.1.14
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/*
 * 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.myfaces.shared_tomahawk.util;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

/**
 * Various helpers to deal with exception
 * 
 * @author [email protected]
 */
public final class ExceptionUtils
{
    private ExceptionUtils()
    {
    }

    /**
     * 

* returns a list of all throwables (including the one you passed in) wrapped by the given throwable. * In contrast to a simple call to getClause() on each throwable it will also check if the throwable class * contain a method getRootCause() (e.g. ServletException or JspException) and call it instead. *

*

* The first list element will your passed in exception, the last list element is the cause. *

*/ public static List getExceptions(Throwable cause) { List exceptions = new ArrayList(10); exceptions.add(cause); do { Throwable nextCause; try { Method rootCause = cause.getClass().getMethod("getRootCause", new Class[]{}); nextCause = (Throwable) rootCause.invoke(cause, new Object[]{}); } catch(Exception e) { nextCause = cause.getCause(); } if (cause == nextCause) { break; } if (nextCause != null) { exceptions.add(nextCause); } cause = nextCause; } while (cause != null); return exceptions; } /** * Find a throwable message starting with the last element.
* Returns the first throwable message where throwable.getMessage() != null */ public static String getExceptionMessage(List throwables) { if (throwables == null) { return null; } for (int i = throwables.size()-1; i>0; i--) { Throwable t = (Throwable) throwables.get(i); if (t.getMessage() != null) { return t.getMessage(); } } return null; } }




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