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GrailsExceptionResolver.java
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GrailsExceptionResolver.java
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/*
* Copyright 2004-2005 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.codehaus.groovy.grails.web.errors;
import grails.util.GrailsUtil;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.codehaus.groovy.control.CompilationFailedException;
import org.codehaus.groovy.control.MultipleCompilationErrorsException;
import org.codehaus.groovy.control.messages.SyntaxErrorMessage;
import org.codehaus.groovy.grails.exceptions.GrailsRuntimeException;
import org.codehaus.groovy.grails.web.mapping.UrlMappingInfo;
import org.codehaus.groovy.grails.web.mapping.UrlMappingsHolder;
import org.codehaus.groovy.grails.web.servlet.mvc.exceptions.GrailsMVCException;
import org.codehaus.groovy.grails.web.util.WebUtils;
import org.codehaus.groovy.runtime.InvokerInvocationException;
import org.springframework.web.context.ServletContextAware;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.handler.SimpleMappingExceptionResolver;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Exception resolver that wraps any runtime exceptions with a GrailsWrappedException instance
*
* @author Graeme Rocher
* @since 22 Dec, 2005
*/
public class GrailsExceptionResolver extends SimpleMappingExceptionResolver implements ServletContextAware {
private ServletContext servletContext;
private static final Log LOG = LogFactory.getLog(GrailsExceptionResolver.class);
/* (non-Javadoc)
* @see org.springframework.web.servlet.handler.SimpleMappingExceptionResolver#resolveException(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, java.lang.Exception)
*/
public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
if ((ex instanceof InvokerInvocationException)||(ex instanceof GrailsMVCException)) {
Throwable t = getRootCause(ex);
if(t instanceof Exception) {
ex = (Exception) t;
}
}
ModelAndView mv = super.resolveException(request, response, handler, ex);
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
// expose the servlet 2.3 specs status code request attribute as 500
request.setAttribute(WebUtils.ERROR_STATUS_CODE_ATTRIBUTE, HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
GrailsUtil.deepSanitize(ex);
LOG.error(ex.getMessage(), ex);
GrailsWrappedRuntimeException gwrex = new GrailsWrappedRuntimeException(servletContext,ex);
mv.addObject("exception",gwrex);
UrlMappingsHolder urlMappings = null;
try {
urlMappings = WebUtils.lookupUrlMappings(servletContext);
} catch (Exception e) {
// ignore, no app ctx in this case.
}
if(urlMappings != null) {
UrlMappingInfo info = urlMappings.matchStatusCode(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, ex);
if(info == null) {
info = urlMappings.matchStatusCode(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, getRootCause(ex));
}
if(info == null) {
info = urlMappings.matchStatusCode(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
}
try {
if(info != null && info.getViewName() != null) {
ViewResolver viewResolver = WebUtils.lookupViewResolver(servletContext);
View v = WebUtils.resolveView(request, info, info.getViewName(),viewResolver);
if(v != null) {
mv.setView(v);
}
}
else if(info != null && info.getControllerName() != null) {
String uri;
if(request.getAttribute(WebUtils.FORWARD_REQUEST_URI_ATTRIBUTE) != null) {
uri = (String)request.getAttribute(WebUtils.FORWARD_REQUEST_URI_ATTRIBUTE);
}
else {
uri = request.getRequestURI();
}
if(!response.isCommitted()) {
info.configure(WebUtils.retrieveGrailsWebRequest());
String forwardUrl = WebUtils.forwardRequestForUrlMappingInfo(request, response, info, mv.getModel());
if(LOG.isDebugEnabled()) {
LOG.debug("Matched URI ["+uri+"] to URL mapping ["+info+"], forwarding to ["+forwardUrl+"] with response ["+response.getClass()+"]");
}
// return an empty ModelAndView since the error handler has been processed
return new ModelAndView();
}
}
} catch (Exception e) {
LOG.error("Unable to render errors view: " + e.getMessage(), e);
throw new GrailsRuntimeException(e);
}
}
return mv;
}
/**
* Obtains the root cause of the given exception
* @param ex The exception
* @return The root cause
*/
public static Throwable getRootCause(Throwable ex) {
while(ex.getCause() != null && !ex.equals(ex.getCause())) {
ex = ex.getCause();
}
return ex;
}
public void setServletContext(ServletContext servletContext) {
this.servletContext = servletContext;
}
public static int extractLineNumber(CompilationFailedException e) {
int lineNumber = -1;
if(e instanceof MultipleCompilationErrorsException) {
MultipleCompilationErrorsException mcee = (MultipleCompilationErrorsException)e;
Object message = mcee.getErrorCollector().getErrors().iterator().next();
if(message instanceof SyntaxErrorMessage) {
SyntaxErrorMessage sem = (SyntaxErrorMessage)message;
lineNumber = sem.getCause().getLine();
}
}
return lineNumber;
}
public static RuntimeException getFirstRuntimeException(Throwable e) {
if(e instanceof RuntimeException) return (RuntimeException) e;
Throwable ex = e;
while(ex.getCause() != null && !ex.equals(ex.getCause())) {
ex = ex.getCause();
if(ex instanceof RuntimeException) return (RuntimeException) ex;
}
return null;
}
}