我们有一个代理服务，从JasperReports服务器下载pdf文件，然后执行vfs：ftps将pdf上传到FTP服务器。下载部分工作正常，但我们正在努力与上传部分。这是我们的问题：
启动代理服务时，我们收到以下WARN消息（注意我们在配置中有一个参数FileURI）：
WARN PollTableEntry transport.vfs.FileURI parameter is missing in the proxy service configuration
并且在运行请求时，我们得到如下异常：
[PassThroughMessageProcessor-2] ERROR Axis2Sender Unexpected error during sending message out
java.lang.NullPointerException
at java.util.StringTokenizer.<init>(StringTokenizer.java:182)
at java.util.StringTokenizer.<init>(StringTokenizer.java:204)
at org.apache.commons.vfs2.provider.ftps.FtpsFileProvider.doCreateFileSystem(FtpsFileProvider.java:67)
at org.apache.commons.vfs2.provider.AbstractOriginatingFileProvider.getFileSystem(AbstractOriginatingFileProvider.java:104)
at org.apache.commons.vfs2.provider.AbstractOriginatingFileProvider.findFile(AbstractOriginatingFileProvider.java:82)
at org.apache.commons.vfs2.provider.AbstractOriginatingFileProvider.findFile(AbstractOriginatingFileProvider.java:66)
at org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:694)
at org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:650)
at org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:606)
at org.apache.synapse.transport.vfs.VFSTransportSender.sendMessage(VFSTransportSender.java:134)
at org.apache.axis2.transport.base.AbstractTransportSender.invoke(AbstractTransportSender.java:112)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:442)
at org.apache.axis2.description.OutOnlyAxisOperationClient.executeImpl(OutOnlyAxisOperation.java:297)
at org.apache.axis2.client.OperationClient.execute(OperationClient.java:149)
at org.apache.synapse.core.axis2.Axis2FlexibleMEPClient.send(Axis2FlexibleMEPClient.java:456)
at org.apache.synapse.core.axis2.Axis2Sender.sendOn(Axis2Sender.java:57)
at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:269)
at org.apache.synapse.endpoints.AbstractEndpoint.send(AbstractEndpoint.java:329)
at org.apache.synapse.endpoints.AddressEndpoint.send(AddressEndpoint.java:59)
at org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:95)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:71)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:114)
at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:230)
at org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:443)
at org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:166)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at org.apache.synapse.transport.passthru.ClientWorker.run(ClientWorker.java:217)
at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
我想知道它是否是潜在的错误或代理配置中的任何错误。
请帮助，谢谢！
这是代理配置xml：
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="GenerateSecurityReport"
transports="https http vfs"
startOnLoad="true"
trace="enable"
statistics="enable">
<description/>
<parameter name="transport.vfs.FileURI">vfs:ftps://ftpUser:ftpPassword@ftp.host/path?vfs.passive=true</parameter>
<parameter name="transport.vfs.ContentType">application/pdf</parameter>
<target>
<endpoint>
<address uri="http://jasperServerHost/path/to/report.pdf"/>
</endpoint>
<inSequence>
<log/>
<property name="Authorization"
expression="fn:concat('Basic ', base64Encode('jasperUser:jasperPassword'))"
scope="transport"
type="STRING"/>
<property name="product"
expression="fn:substring-after(get-property('To'), 'product=')"
scope="default"
type="STRING"/>
</inSequence>
<outSequence>
<log/>
<property name="CONTENT_TYPE"
value="application/pdf"
scope="axis2"
type="STRING"/>
<property name="transport.vfs.ReplyFileName"
expression="fn:concat(get-property('product'), '_vendor_patches.pdf')"
scope="transport"/>
<property name="OUT_ONLY" value="true"/>
<property name="HTTP_SC" value="200" scope="axis2"/>
<send>
<endpoint>
<address uri="vfs:ftps://ftpUser:ftpPassword@ftp.host/path?vfs.passive=true"/>
</endpoint>
</send>
<payloadFactory>
<format>
<html xmlns="">
<body>success</body>
</html>
</format>
</payloadFactory>
<property name="Content-Type"
value="text/html"
scope="transport"
type="STRING"/>
<send/>
</outSequence>
</target>
</proxy>