Apache camel 模仿Apache Camel DefaultErrorHandler

我试图使用自定义处理器处理异常。我的路线生成器看起来像这样：

onException(Exception.class)
    .maximumRedeliveries(0)
    .process(exceptionProcessor)
    .handled(true)
    .to("file:C:\\Mahesh\\delete\\failedrequests");

public class ExceptionProcessor implements Processor 
{
    private static final Logger LOGGER = ExLoggerFactory.getLogger(ExceptionProcessor.class);

    @Override
    public void process(Exchange exchange) throws Exception 
    {
        Exception ex = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
        Object messageHistroy = exchange.getProperty(Exchange.MESSAGE_HISTORY, Object.class);

        LOGGER.error("\n\nMessage History\n---------------------------------------------------------------------------------------------------------------------------------------\n" 
                    + messageHistroy 
                    +"\n\nStacktrace\n---------------------------------------------------------------------------------------------------------------------------------------"
                    );
        ex.printStackTrace();
    }
}

Message History
---------------------------------------------------------------------------------------------------------------------------------------
RouteId              ProcessorId          Processor                                                                        Elapsed (ms)
[route1            ] [route1            ] [file://C:%5CMahesh%5Cdelete%5Ccamelsource                                     ] [       121]
[route1            ] [process1          ] [Processor@0x35a764c7                                                          ] [       120]
[                  ] [to1               ] [file:C:\Mahesh\delete\badworkitems                                            ] [        98]

Message History
---------------------------------------------------------------------------------------------------------------------------------------
[DefaultMessageHistory[routeId=route1, node=process2], DefaultMessageHistory[routeId=null, node=process1]]

我的异常处理器如下所示：

onException(Exception.class)
    .maximumRedeliveries(0)
    .process(exceptionProcessor)
    .handled(true)
    .to("file:C:\\Mahesh\\delete\\failedrequests");

public class ExceptionProcessor implements Processor 
{
    private static final Logger LOGGER = ExLoggerFactory.getLogger(ExceptionProcessor.class);

    @Override
    public void process(Exchange exchange) throws Exception 
    {
        Exception ex = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
        Object messageHistroy = exchange.getProperty(Exchange.MESSAGE_HISTORY, Object.class);

        LOGGER.error("\n\nMessage History\n---------------------------------------------------------------------------------------------------------------------------------------\n" 
                    + messageHistroy 
                    +"\n\nStacktrace\n---------------------------------------------------------------------------------------------------------------------------------------"
                    );
        ex.printStackTrace();
    }
}

Message History
---------------------------------------------------------------------------------------------------------------------------------------
RouteId              ProcessorId          Processor                                                                        Elapsed (ms)
[route1            ] [route1            ] [file://C:%5CMahesh%5Cdelete%5Ccamelsource                                     ] [       121]
[route1            ] [process1          ] [Processor@0x35a764c7                                                          ] [       120]
[                  ] [to1               ] [file:C:\Mahesh\delete\badworkitems                                            ] [        98]

Message History
---------------------------------------------------------------------------------------------------------------------------------------
[DefaultMessageHistory[routeId=route1, node=process2], DefaultMessageHistory[routeId=null, node=process1]]

如您所见，上面我试图模仿的是用户的行为：它首先打印消息历史记录，然后堆栈跟踪

但是，my

ExceptionProcessor

不会以与

DefaultErrorHandler

相同的方式打印消息历史记录<代码>默认错误处理程序按如下方式打印：

onException(Exception.class)
    .maximumRedeliveries(0)
    .process(exceptionProcessor)
    .handled(true)
    .to("file:C:\\Mahesh\\delete\\failedrequests");

public class ExceptionProcessor implements Processor 
{
    private static final Logger LOGGER = ExLoggerFactory.getLogger(ExceptionProcessor.class);

    @Override
    public void process(Exchange exchange) throws Exception 
    {
        Exception ex = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
        Object messageHistroy = exchange.getProperty(Exchange.MESSAGE_HISTORY, Object.class);

        LOGGER.error("\n\nMessage History\n---------------------------------------------------------------------------------------------------------------------------------------\n" 
                    + messageHistroy 
                    +"\n\nStacktrace\n---------------------------------------------------------------------------------------------------------------------------------------"
                    );
        ex.printStackTrace();
    }
}

Message History
---------------------------------------------------------------------------------------------------------------------------------------
RouteId              ProcessorId          Processor                                                                        Elapsed (ms)
[route1            ] [route1            ] [file://C:%5CMahesh%5Cdelete%5Ccamelsource                                     ] [       121]
[route1            ] [process1          ] [Processor@0x35a764c7                                                          ] [       120]
[                  ] [to1               ] [file:C:\Mahesh\delete\badworkitems                                            ] [        98]

Message History
---------------------------------------------------------------------------------------------------------------------------------------
[DefaultMessageHistory[routeId=route1, node=process2], DefaultMessageHistory[routeId=null, node=process1]]

而my

ExceptionProcessor

的打印方式如下：

onException(Exception.class)
    .maximumRedeliveries(0)
    .process(exceptionProcessor)
    .handled(true)
    .to("file:C:\\Mahesh\\delete\\failedrequests");

public class ExceptionProcessor implements Processor 
{
    private static final Logger LOGGER = ExLoggerFactory.getLogger(ExceptionProcessor.class);

    @Override
    public void process(Exchange exchange) throws Exception 
    {
        Exception ex = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
        Object messageHistroy = exchange.getProperty(Exchange.MESSAGE_HISTORY, Object.class);

        LOGGER.error("\n\nMessage History\n---------------------------------------------------------------------------------------------------------------------------------------\n" 
                    + messageHistroy 
                    +"\n\nStacktrace\n---------------------------------------------------------------------------------------------------------------------------------------"
                    );
        ex.printStackTrace();
    }
}

Message History
---------------------------------------------------------------------------------------------------------------------------------------
RouteId              ProcessorId          Processor                                                                        Elapsed (ms)
[route1            ] [route1            ] [file://C:%5CMahesh%5Cdelete%5Ccamelsource                                     ] [       121]
[route1            ] [process1          ] [Processor@0x35a764c7                                                          ] [       120]
[                  ] [to1               ] [file:C:\Mahesh\delete\badworkitems                                            ] [        98]

Message History
---------------------------------------------------------------------------------------------------------------------------------------
[DefaultMessageHistory[routeId=route1, node=process2], DefaultMessageHistory[routeId=null, node=process1]]

Q.我的处理器似乎无法将第三列处理器和第三行处理器连接到端点。我怎么得到这个

另外，在打印消息历史记录之前，

DefaultErrorHandler

也会打印以下内容：

o.a.camel.processor.DefaultErrorHandler  : Failed delivery for (MessageId: ID-01HW865638-58603-1492677082431-0-7 on ExchangeId: ID-01HW865638-58603-1492677082431-0-8). Exhausted after delivery attempt: 1 caught: com.fasterxml.jackson.core.JsonParseException: Unexpected character ('"' (code 34)): was expecting comma to separate OBJECT entries
at [Source: C:\Mahesh\delete\camelsource\file1.json; line: 4, column: 3]. Processed by failure processor: FatalFallbackErrorHandler[Channel[sendTo(file://C:%5CMahesh%5Cdelete%5Cbadworkitems)]]

---

Q.如您所见，

DefaultFaultHandler

还可以打印邮件id、交换id、源文件名和发送到文件夹名。我想知道它是从哪里得到这些信息的。对于源文件名，我尝试了所有

Exchange.file.*

属性，但所有打印的

null

只需查看驼峰源代码，它使用您也可以访问的消息历史记录来打印该信息。您可以在github上找到源代码