Apache Camel异常处理

雨点打透心脏的1/2处 2022-08-05 11:15 205阅读 0赞

直接看代码

package com.lala.bean;
    
    import org.apache.camel.Exchange;
    import org.apache.camel.Processor;
    
    public class TestBean implements Processor 
    {
    	private String appId;
    	public void process(Exchange exchange) throws Exception 
    	{
    		if(appId == null || "".equals(appId))
    		{
    			throw new NullPointerException("appId cannot be null ... ");
    		}
    		System.out.println(appId + " : --------------- " + this.getClass());
    	}
    	public String getAppId() 
    	{
    		return appId;
    	}
    	public void setAppId(String appId) 
    	{
    		this.appId = appId;
    	}
    }

package com.lala.bean;
    
    import org.apache.camel.Exchange;
    import org.apache.camel.Processor;
    
    public class Error implements Processor 
    {
    	public void process(Exchange exchange) throws Exception
    	{
    		System.out.println("-------------------------------------------");
    		//这样获取异常信息
    		Exception exce = exchange.getProperty("CamelExceptionCaught", Exception.class);
    		System.out.println(exce.getMessage());
    		exce.printStackTrace();
    	}
    }

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:camel="http://camel.apache.org/schema/spring"
    	xsi:schemaLocation="
            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
            http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">
    	
    	<bean id="bean1" class="com.lala.bean.TestBean">
    		<property name="appId" value="wwwwwwww"></property>
    	</bean>
    	
    	<bean id="bean2" class="com.lala.bean.TestBean"></bean>
    	
    	<bean id="bean3" class="com.lala.bean.TestBean">
    		<property name="appId" value="mmmmmmmm"></property>
    	</bean>
    
    	<bean id="errorBean" class="com.lala.bean.Error" />
    
    	<bean id="testErrorHandler" class="org.apache.camel.builder.DeadLetterChannelBuilder">
    	  <property name="deadLetterUri" value="bean:errorBean"/>
    	</bean>
    
    	<camelContext errorHandlerRef="testErrorHandler" id="camelContext" xmlns="http://camel.apache.org/schema/spring">
    		
    		<template id="camelContextTemplate" />
    		
    		<route errorHandlerRef="testErrorHandler">
    			<from uri="direct:start-error" />
    			<to uri="bean:bean1" />
    			<to uri="bean:bean2" />
    			<to uri="bean:bean3" />
    		</route>
    
    	</camelContext>
    
    </beans>

根据上面的配置，很容易看出，bean2会抛异常  
这样，在上面的那个route里面，只要有异常，就会路由到bean:errorBean里面去

注意，上面的route上的errorHandlerRef 和 camelContext上面的errorHandlerRef不需要同时添加