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在 Mule 中，我有以下流程：有一个选择流程控制，它测试输入并验证输入字符串是否等于“ctr1”。

    <flow name="mediationFlow1" doc:name="mediationFlow1">
         <file:inbound-endpoint path="C:\MuleStudio\SandBox\input" pollingFrequency="3000" responseTimeout="10000" doc:name="File"/>
        <file:file-to-string-transformer doc:name="File to String"/>
        <choice doc:name="Choice">
            <when expression="payload=='ctr1'">
                <cxf:jaxws-client operation="find" serviceClass="services.port.PortWS" port="portWSPort" enableMuleSoapHeaders="true" doc:name="Port"/>
                <http:outbound-endpoint exchange-pattern="request-response" method="POST" address="http://localhost:8080/Actors/portWS" doc:name="portWS"/>
            </when>
            <otherwise >
                <cxf:jaxws-client operation="find" serviceClass="services.douane.DouaneWS" port="douaneWSPort" enableMuleSoapHeaders="true" doc:name="Douane"/>
                <http:outbound-endpoint exchange-pattern="request-response" method="POST" address="http://localhost:8080/Actors/douaneWS" doc:name="douaneWS"/>
            </otherwise>
        </choice>
       <file:outbound-endpoint path="C:\MuleStudio\SandBox\output" outputPattern="#[function:datestamp:dd-MM-yy]_#[function:systime].xml " responseTimeout="10000" doc:name="Outgoing File"/>
    </flow>
</mule>

当我单独运行它们时，这两个 Web 服务调用都可以完美运行，但是当我添加选项 ccontrol 时，这就是我得到的：

INFO  2013-05-14 15:48:07,892 [[mediation].connector.file.mule.default.receiver.01] org.mule.transport.file.FileMessageReceiver: Lock obtained on file: C:\MuleStudio\SandBox\input\input.txt
INFO  2013-05-14 15:48:08,206 [[mediation].mediationFlow1.stage1.02] org.mule.transport.service.DefaultTransportServiceDescriptor: Loading default outbound transformer: org.mule.transport.http.transformers.ObjectToHttpClientMethodRequest
INFO  2013-05-14 15:48:08,216 [[mediation].mediationFlow1.stage1.02] org.mule.transport.service.DefaultTransportServiceDescriptor: Loading default response transformer: org.mule.transport.http.transformers.MuleMessageToHttpResponse
INFO  2013-05-14 15:48:08,253 [[mediation].mediationFlow1.stage1.02] org.mule.transport.service.DefaultTransportServiceDescriptor: Loading default outbound transformer: org.mule.transport.http.transformers.ObjectToHttpClientMethodRequest
INFO  2013-05-14 15:48:08,254 [[mediation].mediationFlow1.stage1.02] org.mule.lifecycle.AbstractLifecycleManager: Initialising: 'connector.http.mule.default.dispatcher.7073225'. Object is: HttpClientMessageDispatcher
INFO  2013-05-14 15:48:08,260 [[mediation].mediationFlow1.stage1.02] org.mule.lifecycle.AbstractLifecycleManager: Starting: 'connector.http.mule.default.dispatcher.7073225'. Object is: HttpClientMessageDispatcher
INFO  2013-05-14 15:48:09,035 [[mediation].connector.file.mule.default.dispatcher.01] org.mule.lifecycle.AbstractLifecycleManager: Initialising: 'connector.file.mule.default.dispatcher.23051110'. Object is: FileMessageDispatcher
INFO  2013-05-14 15:48:09,035 [[mediation].connector.file.mule.default.dispatcher.01] org.mule.lifecycle.AbstractLifecycleManager: Starting: 'connector.file.mule.default.dispatcher.23051110'. Object is: FileMessageDispatcher
INFO  2013-05-14 15:48:09,040 [[mediation].connector.file.mule.default.dispatcher.01] org.mule.transport.file.FileConnector: Writing file to: C:\MuleStudio\SandBox\output\14-05-13_1368539289037.xml
INFO  2013-05-14 15:48:09,043 [[mediation].connector.file.mule.default.dispatcher.01] org.mule.module.xml.transformer.jaxb.JAXBContextResolver: No common Object of type 'class javax.xml.bind.JAXBContext' configured, creating a local one for: SimpleDataType{type=services.port.Port, mimeType='text/xml'}, SimpleDataType{type=java.io.InputStream, mimeType='*/*'}
ERROR 2013-05-14 15:48:09,058 [[mediation].connector.file.mule.default.dispatcher.01] org.mule.exception.DefaultMessagingExceptionStrategy: 
********************************************************************************
Message               : An invalid return type "class java.io.InputStream" was specified for transformer "JAXBMarshallerTransformer"
Code                  : MULE_ERROR-266
--------------------------------------------------------------------------------
Exception stack is:
1. An invalid return type "class java.io.InputStream" was specified for transformer "JAXBMarshallerTransformer" (org.mule.api.transformer.TransformerException)
  org.mule.module.xml.transformer.jaxb.JAXBMarshallerTransformer:122 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/transformer/TransformerException.html)
--------------------------------------------------------------------------------
Root Exception stack trace:
org.mule.api.transformer.TransformerException: An invalid return type "class java.io.InputStream" was specified for transformer "JAXBMarshallerTransformer"
    at org.mule.module.xml.transformer.jaxb.JAXBMarshallerTransformer.doTransform(JAXBMarshallerTransformer.java:122)
    at org.mule.transformer.AbstractTransformer.transform(AbstractTransformer.java:411)
    at org.mule.DefaultMuleMessage.getPayload(DefaultMuleMessage.java:362)
    + 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
********************************************************************************

我不确定它是否来自选择测试表达式？虽然我找不到太多关于如何详细使用选择控制流的信息。

感谢你的帮助。谢谢你。

4

1 回答 1

1

Mule 默认情况下会在流程中应用大量转换器来将有效负载转换为所需的格式。

在没有选择路由器的情况下，它将返回的对象转换为 xml 字符串以写入文件。但是对于选择路由器，程序员有责任提供一个转换器来将响应对象转换为 XML 字符串。

在选择路由器之后和写入文件出站之前，将以下 mule-xml jaxb 对象添加到 xml 转换器。

 .....
    </otherwise>
 </choice>

 <xm:jaxb-object-to-xml-transformer name="ObjectToXML" jaxbContext-ref="MyJaxb"  returnClass="java.lang.String" encoding="UTF-8"/>

希望这可以帮助。

于 2013-05-14T14:57:47.047 回答