org.springframework.boot.SpringBootExceptionHandler Maven / Gradle / Ivy
/*
* Copyright 2012-2019 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
*
* https://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.boot;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* {@link UncaughtExceptionHandler} to suppress handling already logged exceptions and
* dealing with system exit.
*
* @author Phillip Webb
*/
class SpringBootExceptionHandler implements UncaughtExceptionHandler {
private static final Set LOG_CONFIGURATION_MESSAGES;
static {
Set messages = new HashSet<>();
messages.add("Logback configuration error detected");
LOG_CONFIGURATION_MESSAGES = Collections.unmodifiableSet(messages);
}
private static LoggedExceptionHandlerThreadLocal handler = new LoggedExceptionHandlerThreadLocal();
private final UncaughtExceptionHandler parent;
private final List loggedExceptions = new ArrayList<>();
private int exitCode = 0;
SpringBootExceptionHandler(UncaughtExceptionHandler parent) {
this.parent = parent;
}
void registerLoggedException(Throwable exception) {
this.loggedExceptions.add(exception);
}
void registerExitCode(int exitCode) {
this.exitCode = exitCode;
}
@Override
public void uncaughtException(Thread thread, Throwable ex) {
try {
if (isPassedToParent(ex) && this.parent != null) {
this.parent.uncaughtException(thread, ex);
}
}
finally {
this.loggedExceptions.clear();
if (this.exitCode != 0) {
System.exit(this.exitCode);
}
}
}
private boolean isPassedToParent(Throwable ex) {
return isLogConfigurationMessage(ex) || !isRegistered(ex);
}
/**
* Check if the exception is a log configuration message, i.e. the log call might not
* have actually output anything.
* @param ex the source exception
* @return {@code true} if the exception contains a log configuration message
*/
private boolean isLogConfigurationMessage(Throwable ex) {
if (ex instanceof InvocationTargetException) {
return isLogConfigurationMessage(ex.getCause());
}
String message = ex.getMessage();
if (message != null) {
for (String candidate : LOG_CONFIGURATION_MESSAGES) {
if (message.contains(candidate)) {
return true;
}
}
}
return false;
}
private boolean isRegistered(Throwable ex) {
if (this.loggedExceptions.contains(ex)) {
return true;
}
if (ex instanceof InvocationTargetException) {
return isRegistered(ex.getCause());
}
return false;
}
static SpringBootExceptionHandler forCurrentThread() {
return handler.get();
}
/**
* Thread local used to attach and track handlers.
*/
private static class LoggedExceptionHandlerThreadLocal extends ThreadLocal {
@Override
protected SpringBootExceptionHandler initialValue() {
SpringBootExceptionHandler handler = new SpringBootExceptionHandler(
Thread.currentThread().getUncaughtExceptionHandler());
Thread.currentThread().setUncaughtExceptionHandler(handler);
return handler;
}
}
}