/*
* Copyright 2002-2009 the original author or authors.
*
* 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 org.springframework.web.util;
import javax.servlet.ServletException;
import org.springframework.core.NestedExceptionUtils;
/**
* Subclass of {@link ServletException} that properly handles a root cause in terms
* of message and stacktrace, just like NestedChecked/RuntimeException does.
*
* <p>Note that the plain ServletException doesn't expose its root cause at all,
* neither in the exception message nor in printed stack traces! While this might
* be fixed in later Servlet API variants (which even differ per vendor for the
* same API version), it is not reliably available on Servlet 2.4 (the minimum
* version required by Spring 3.x), which is why we need to do it ourselves.
*
* <p>The similarity between this class and the NestedChecked/RuntimeException
* class is unavoidable, as this class needs to derive from ServletException.
*
* @author Juergen Hoeller
* @since 1.2.5
* @see #getMessage
* @see #printStackTrace
* @see org.springframework.core.NestedCheckedException
* @see org.springframework.core.NestedRuntimeException
*/
public class NestedServletException extends ServletException {
/** Use serialVersionUID from Spring 1.2 for interoperability */
private static final long serialVersionUID = -5292377985529381145L;
static {
// Eagerly load the NestedExceptionUtils class to avoid classloader deadlock
// issues on OSGi when calling getMessage(). Reported by Don Brown; SPR-5607.
NestedExceptionUtils.class.getName();
}
/**
* Construct a <code>NestedServletException</code> with the specified detail message.
* @param msg the detail message
*/
public NestedServletException(String msg) {
super(msg);
}
/**
* Construct a <code>NestedServletException</code> with the specified detail message
* and nested exception.
* @param msg the detail message
* @param cause the nested exception
*/
public NestedServletException(String msg, Throwable cause) {
super(msg, cause);
// Set JDK 1.4 exception chain cause if not done by ServletException class already
// (this differs between Servlet API versions).
if (getCause() == null && cause!=null) {
initCause(cause);
}
}
/**
* Return the detail message, including the message from the nested exception
* if there is one.
*/
@Override
public String getMessage() {
return NestedExceptionUtils.buildMessage(super.getMessage(), getCause());
}
}
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