Ftp Mule异常策略不会停止处理流

我有下面的场景。如果由于某种原因FTP上载失败（在本例中，我输入了错误的凭据），则会正确调用catch exception策略，但我仍会在日志文件中看到消息

upload complete.

为什么流在异常发生后继续执行

<flow name="mainFlow" doc:name="mainFlow">
    <vm:inbound-endpoint path="test" exchange-pattern="one-way" />

    <choice>
        <when expression="#[flowVars.fileToUpload != null]">
            <set-payload value="#[flowVars.fileToUpload]" /> 
            <ftp:outbound-endpoint host="${ftp.host}" port="${ftp.port}" user="${ftp.username}" password="${ftp.password}" path="${ftp.path.input}"  outputPattern="#[flowVars.fileName]" /> 
        </when>
        <otherwise>
            <logger doc:name="Logger"/>
        </otherwise>
    </choice>

    <logger message="Upload complete." level="INFO" />

    <catch-exception-strategy>
        <logger doc:name="Exception occurred"/>
    </catch-exception-strategy>
</flow>

---

因为传入的MuleEvent是异步的。尝试将ProcessingStrategy=“synchronous”设置为关闭状态：

<flow name="mainFlow" doc:name="mainFlow" processingStrategy="synchronous">
    ....
</flow>

....