Writing to ${app.home} with Mule workflow and File endpoint - rss

Question

I have a groovy script that generates an RSS feed that I am attempting to write to ${app.home} /rss using a file endpoint.
I am then serving up this RSS feed as a static resource via an http endpoint.
<flow name="rssModifier" doc:name="rssModifier">
<quartz:inbound-endpoint jobName="job" repeatInterval="300000" responseTimeout="10000" doc:name="Quartz">
<quartz:event-generator-job/>
</quartz:inbound-endpoint>
<all doc:name="All">
<processor-chain>
<scripting:component doc:name="FirstGroovyRssFeed">
<scripting:script engine="Groovy" file="C:\git-gms\edus-esb-rss-test-harness\src\main\java\edu\ucdavis\iet\edus\rsstestharness\server\groovy\InitializeRssFeed.groovy"/>
</scripting:component>
<logger message="#[payload]" level="INFO" doc:name="Logger"/>
<file:outbound-endpoint path="${app.home}/rss/groovy.xml" responseTimeout="10000" doc:name="File"/>
</processor-chain>
</all>
</flow>
<flow name="httpWebServer" doc:name="httpWebServer">
<http:inbound-endpoint address="http://localhost:8084/static" doc:name="HTTP" exchange-pattern="request-response" connector-ref="HTTP_HTTPS"/>
<http:static-resource-handler resourceBase="${app.home}/rss"
defaultFile="rometest.xml" doc:name="HTTP Static Resource Handler"/>
<logger message="#[payload] #[message]" level="INFO" doc:name="Logger"/>
</flow>
I've confirmed that the groovy.xml file exists in the ${app.home} directory when this application is run, but I am getting the following error, and the rss feed xml is not being written to the file:
Message : Streaming failed. Could not get output stream. Failed to route event via endpoint: DefaultOutboundEndpoint{endpointUri=file:///C:/Users/gmsharpe/MuleStudio/workspace-3.5/.mule/apps/edus-esb-rss-test-harness/rss/groovy.xml, connector=FileConnector
{
name=output
lifecycle=start
this=353ccb63
numberOfConcurrentTransactedReceivers=4
createMultipleTransactedReceivers=true
connected=true
supportedProtocols=[file]
serviceOverrides=<none>
}
, name='endpoint..C.Users.gmsharpe.MuleStudio.workspace.3.5.mule.apps.edus.esb.rss.test.harness.rss.groovy.xml', mep=ONE_WAY, properties={}, transactionConfig=Transaction{factory=null, action=INDIFFERENT, timeout=0}, deleteUnacceptedMessages=false, initialState=started, responseTimeout=10000, endpointEncoding=UTF-8, disableTransportTransformer=false}. Message payload is of type: String
Code : MULE_ERROR--2
--------------------------------------------------------------------------------
Exception stack is:
1. The system cannot find the path specified (java.io.IOException)
java.io.WinNTFileSystem:-2 (null)
2. Streaming failed. Could not get output stream. Failed to route event via endpoint: DefaultOutboundEndpoint{endpointUri=file:///C:/Users/gmsharpe/MuleStudio/workspace-3.5/.mule/apps/edus-esb-rss-test-harness/rss/groovy.xml, connector=FileConnector
{
name=output
lifecycle=start
this=353ccb63
numberOfConcurrentTransactedReceivers=4
createMultipleTransactedReceivers=true
connected=true
supportedProtocols=[file]
serviceOverrides=<none>
}
, name='endpoint..C.Users.gmsharpe.MuleStudio.workspace.3.5.mule.apps.edus.esb.rss.test.harness.rss.groovy.xml', mep=ONE_WAY, properties={}, transactionConfig=Transaction{factory=null, action=INDIFFERENT, timeout=0}, deleteUnacceptedMessages=false, initialState=started, responseTimeout=10000, endpointEncoding=UTF-8, disableTransportTransformer=false}. Message payload is of type: String (org.mule.api.transport.DispatchException)
org.mule.transport.file.FileConnector:569 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/transport/DispatchException.html)
--------------------------------------------------------------------------------
Root Exception stack trace:
java.io.IOException: The system cannot find the path specified
at java.io.WinNTFileSystem.createFileExclusively(Native Method)
at java.io.File.createNewFile(Unknown Source)
at org.mule.util.FileUtils.createFile(FileUtils.java:93)
+ 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
********************************************************************************

Answer 1

I figured out what I was doing wrong. I needed to define only the directory path for the file outbound endpoint. I also needed a file connector that was defined as follows:
<file:connector name="output" autoDelete="false" outputAppend="true" outputPattern="groovy.xml" streaming="false" validateConnections="true" doc:name="File"/>
File connector is configured to allow appending to an existing file if present and defines the name of the file via the 'outputPattern' attribute.