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/*
* Copyright 2000-2013 Vaadin Ltd.
*
* 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.vaadin.server;
import java.lang.reflect.InvocationTargetException;
import java.net.SocketException;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.vaadin.event.ListenerMethod.MethodException;
import com.vaadin.server.ClientConnector.ConnectorErrorEvent;
import com.vaadin.server.ServerRpcManager.RpcInvocationException;
import com.vaadin.shared.Connector;
import com.vaadin.ui.AbstractComponent;
import com.vaadin.ui.Component;
public class DefaultErrorHandler implements ErrorHandler {
@Override
public void error(ErrorEvent event) {
doDefault(event);
}
public static void doDefault(ErrorEvent event) {
Throwable t = event.getThrowable();
if (t instanceof SocketException) {
// Most likely client browser closed socket
getLogger().info(
"SocketException in CommunicationManager."
+ " Most likely client (browser) closed socket.");
return;
}
t = findRelevantThrowable(t);
// Finds the original source of the error/exception
AbstractComponent component = findAbstractComponent(event);
if (component != null) {
// Shows the error in AbstractComponent
ErrorMessage errorMessage = AbstractErrorMessage
.getErrorMessageForException(t);
component.setComponentError(errorMessage);
}
// also print the error on console
getLogger().log(Level.SEVERE, "", t);
}
/**
* Vaadin wraps exceptions in its own and due to reflection usage there
* might be also other irrelevant exceptions that make no sense for Vaadin
* users (~developers using Vaadin). This method tries to choose the
* relevant one to be reported.
*
* @since 7.2
* @param t
* throwable given for default error handler
* @return the throwable that is relevant for Vaadin users
*/
private static Throwable findRelevantThrowable(Throwable t) {
try {
if ((t instanceof RpcInvocationException)
&& (t.getCause() instanceof InvocationTargetException)) {
/*
* RpcInvocationException (that always wraps irrelevant
* java.lang.reflect.InvocationTargetException) might only be
* relevant for core Vaadin developers.
*/
return findRelevantThrowable(t.getCause().getCause());
} else if (t instanceof MethodException) {
/*
* Method exception might only be relevant for core Vaadin
* developers.
*/
return t.getCause();
}
} catch (Exception e) {
// NOP, just return the original one
}
return t;
}
private static Logger getLogger() {
return Logger.getLogger(DefaultErrorHandler.class.getName());
}
/**
* Returns the AbstractComponent associated with the given error if such can
* be found
*
* @param event
* The error to investigate
* @return The {@link AbstractComponent} to error relates to or null if
* could not be determined or if the error does not relate to any
* AbstractComponent.
*/
public static AbstractComponent findAbstractComponent(
com.vaadin.server.ErrorEvent event) {
if (event instanceof ConnectorErrorEvent) {
Component c = findComponent(((ConnectorErrorEvent) event)
.getConnector());
if (c instanceof AbstractComponent) {
return (AbstractComponent) c;
}
}
return null;
}
/**
* Finds the nearest component by traversing upwards in the hierarchy. If
* connector is a Component, that Component is returned. Otherwise, looks
* upwards in the hierarchy until it finds a {@link Component}.
*
* @return A Component or null if no component was found
*/
public static Component findComponent(Connector connector) {
if (connector instanceof Component) {
return (Component) connector;
}
if (connector.getParent() != null) {
return findComponent(connector.getParent());
}
return null;
}
}
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