Spring集成-包括错误中的有效负载

Question

我试图将inputMessage有效内容包含在错误中，但似乎从未传递过，并且充实似乎也不起作用。

我有一个目录轮询服务：

<file:inbound-channel-adapter
        id="incomingFiles"
        auto-startup="true"
        auto-create-directory="false"
        channel="myFiles"
        filename-pattern="${directory.local.pattern}"
        directory="file:${directory.local}">
    <int:poller id="poller" fixed-delay="${directory.local.poll}"/>
</file:inbound-channel-adapter>

这些文件然后通过SFTP上传：

<sftp:outbound-channel-adapter
        id="sftpOutboundAdapter"
        channel="myFiles"
        charset="UTF-8"
        remote-directory="${directory.remote}"
        session-factory="sftpSessionFactory">
    <sftp:request-handler-advice-chain>
        <bean class="org.springframework.integration.handler.advice.ExpressionEvaluatingRequestHandlerAdvice">
            <property name="onSuccessExpression" value="payload.delete()"/>
            <property name="successChannel" ref="successChannel"/>
            <property name="onFailureExpression" value="payload.renameTo(payload.absolutePath + '.error')"/>
            <property name="failureChannel" ref="failChannel" />
        </bean>
    </sftp:request-handler-advice-chain>
</sftp:outbound-channel-adapter>

在成功通道上，我将其记录并通过successChannel发送和发送，在该通道上另一个服务将其拾取并发送电子邮件，这可以100％起作用：

    <!-- Log Channel -->
    <int:logging-channel-adapter id="logChannel" level="INFO"/>

    <!-- Success Endpoint -->
    <int:channel id="successChannel">
        <int:interceptors>
            <int:wire-tap channel="successLogChannel"/>
        </int:interceptors>
    </int:channel>

    <!-- Success Logging -->
    <int:channel id="successLogChannel"/>
    <int:transformer
            input-channel="successLogChannel"
            output-channel="logChannel"
            expression="'Successfully transferred ' + inputMessage.payload.absolutePath"/>

    <!-- Send success email -->
    <int:chain input-channel="successChannel">
        <int:header-enricher>
            <int:header name="to" value="${success.email.to}"/>
            <int:header name="from" value="${success.email.from}" />
            <int:header name="subject" value="${success.email.subject}"/>
            <int:header name="filename" expression="inputMessage.payload.absolutePath"/>
        </int:header-enricher>
        <int:service-activator ref="Email" method="sendSuccessMail"/>
    </int:chain>

org.springframework.integration.handler.LoggingHandler-成功传输/tmp/test-file.dat

现在，当我尝试完全相同的错误处理时，表达式inputMessage.payload.filename无法求值。

    <!-- Fail Endpoint -->
    <int:channel id="failChannel">
        <int:interceptors>
            <int:wire-tap channel="failLogChannel"/>
        </int:interceptors>
    </int:channel>

    <!-- Fail Logging -->
    <int:channel id="failLogChannel"/>
    <int:transformer
            input-channel="failLogChannel"
            output-channel="logChannel"
            expression="'Failed to transfer ' + inputMessage.payload.absolutePath"/>

    <!-- Send fail email -->
    <int:chain input-channel="failChannel">
        <int:header-enricher>
            <int:header name="to" value="${fail.email.to}"/>
            <int:header name="from" value="${fail.email.from}" />
            <int:header name="subject" value="${fail.email.subject}"/>
            <int:header name="filename" expression="inputMessage.payload.absolutePath"/>
        </int:header-enricher>
        <int:service-activator ref="Email" method="sendFailMail"/>
    </int:chain>

错误org.springframework.integration.handler.LoggingHandler-org.springframework.integration.transformer.MessageTransformationException：org.springframework.integration.MessageHandlingException：表达式求值失败：'无法传输'+ inputMessage.payload.absolutePath

我曾尝试添加标头扩展器，但是当出现错误时，似乎有效负载甚至都不会从SFTP出站通道中消失：

    <!-- Fail Endpoint -->
    <int:channel id="failChannel"/>
    <int:chain input-channel="failChannel" output-channel="failChannelEnriched">
        <int:header-enricher>
            <int:header name="to" value="${fail.email.to}"/>
            <int:header name="from" value="${fail.email.from}"/>
            <int:header name="subject" value="${fail.email.subject}"/>
            <int:header name="filename" expression="inputMessage.payload.absolutePath"/>
        </int:header-enricher>
    </int:chain>


    <int:channel id="failChannelEnriched">
        <int:interceptors>
            <int:wire-tap channel="failLogChannel"/>
        </int:interceptors>
    </int:channel>

    <!-- Fail Logging -->
    <int:channel id="failLogChannel"/>
    <int:transformer
            input-channel="failLogChannel"
            output-channel="logChannel"
            expression="'Failed to transfer ' + headers['filename']"/>

    <!-- Send fail email -->
    <int:chain input-channel="failChannelEnriched">
        <int:service-activator ref="Email" method="sendFailMail"/>
    </int:chain>

错误org.springframework.integration.handler.LoggingHandler-org.springframework.integration.transformer.MessageTransformationException：org.springframework.integration.MessagingException：无法转换消息头

...

由以下原因引起：org.springframework.expression.spel.SpelEvaluationException：EL1008E :(位置0）：在类型为“ org.springframework.integration.message.ErrorMessage”的对象上找不到字段或属性“ inputMessage”

在org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty（PropertyOrFieldReference.java:246）处

查看spring文档，我可以看到org.springframework.integration.message.ErrorMessage确实接受标头，但不知何故没有设置它。

有什么建议吗？

Answer 1

为了成功，将特殊的AdviceMessage发送到该通道； 它具有inputMessage属性（有效负载是表达式求值的结果）。

对于错误情况，将正常的ErrorMessage发送到通道。 它的有效负载是具有正常属性的MessagingException ： cause （发生的异常）和failedMessage 。

实际的异常是MessageHandlingExpressionEvaluatingAdviceException ，它具有一个额外的属性evaluationResult其中包含表达式求值的结果。

因此，您需要针对失败案例的不同表达式payload.failedMessage.payload.absolutePath 。