我在使用 Mule 中的 RSS 提要拆分器将 RSS 提要从某些网站拆分为单个 SyndEntry 对象时遇到问题。我已经从我的 Mule 应用程序中包含了 xml 代码。我还包括在 3 个不同的提要上运行我的 Mule 应用程序的 3 个不同实例的日志（第一个有效，接下来的两个给出错误）。不要担心底部第一个提要的输出，但我将其包含在其中以表明某些提要确实可以转换（拆分）为 SyndEntry 对象，随后可以从这些对象中提取元素（通过我的 EntryReceiver在我的 Mule 应用程序中定义的类）。然而，对于我尝试拆分的大多数其他提要，我最终得到了相同的错误。如果可以，请你帮助我。
注意：我还在末尾包含了一个 EntryReceiver 类的片段，它的函数接受一个 SyndEntry 对象，但是给出错误的提要从一开始就不会进入函数。
骡子申请代码...
<http:polling-connector name="PollingHttpConnector" pollingFrequency="60000" doc:name="HTTP Polling" clientSoTimeout="10000" cookieSpec="netscape" receiveBacklog="0" receiveBufferSize="0" sendBufferSize="0" serverSoTimeout="10000" socketSoLinger="0" validateConnections="true"/>
<flow name="myFlow" doc:name="myFlow">
<http:inbound-endpoint exchange-pattern="one-way" doc:name="HTTP" address="http://www.nasa.gov/rss/dyn/breaking_news.rss" connector-ref="PollingHttpConnector"/>
<rss:feed-splitter/>
<rss:entry-last-updated-filter/>
<component class="path.to.EntryReceiver" doc:name="Java"/>
<logger message="#[payload]" level="INFO" doc:name="Logger"/>
<http:outbound-endpoint exchange-pattern="request-response" host="${my.host}" port="${my.port}" path="api/v1/activity" method="POST" mimeType="application/json" doc:name="HTTP"/>
<logger message="#[payload]" level="INFO" doc:name="Logger"/>
</flow>
RossMason 饲料（工作）...来自http://rossmason.blogspot.com/feeds/posts/default
org.mule.DefaultMuleMessage
{
id=279b9b1a-e979-11e2-ba08-0d15b2b474eb
payload=org.mule.transport.http.ReleasingInputStream
correlationId=<not set>
correlationGroup=-1
correlationSeq=-1
encoding=UTF-8
exceptionPayload=<not set>
Message properties:
INVOCATION scoped properties:
INBOUND scoped properties:
Cache-Control=private, max-age=0
Connection=false
Content-Type=application/atom+xml; charset=UTF-8
Date=Wed, 10 Jul 2013 15:55:33 GMT
ETag=W/"CUUBQXs6cCl7ImA9WhJbFkQ."
Expires=Wed, 10 Jul 2013 15:55:33 GMT
Keep-Alive=false
Last-Modified=Wed, 26 Sep 2012 21:00:50 GMT
MULE_ORIGINATING_ENDPOINT=endpoint.http.rossmason.blogspot.com.feeds.posts.default
Server=GSE
Transfer-Encoding=chunked
X-Content-Type-Options=nosniff
X-XSS-Protection=1; mode=block
http.headers={ETag=W/"CUUBQXs6cCl7ImA9WhJbFkQ.", X-XSS-Protection=1; mode=block, Expires=Wed, 10 Jul 2013 15:55:33 GMT, Last-Modified=Wed, 26 Sep 2012 21:00:50 GMT, Connection=false, Server=GSE, X-Content-Type-Options=nosniff, Cache-Control=private, max-age=0, Transfer-Encoding=chunked, Date=Wed, 10 Jul 2013 15:55:33 GMT, Keep-Alive=false, Content-Type=application/atom+xml; charset=UTF-8}
http.method=GET
http.query.params={}
http.query.string=
http.request=http://rossmason.blogspot.com/feeds/posts/default
http.status=200
http.version=HTTP/1.1
OUTBOUND scoped properties:
MULE_ENCODING=UTF-8
}
org.mule.api.processor.LoggerMessageProcessor: { "priority" : 0.1 , "actor" : { "objectType" : "person" , "id" : "Ross Mason" , "displayName" : "Strategy is Something You Can Only Learn"} , "verb" : "post" , "object" : { "url" : "tag:blogger.com,1999:blog-1425601518852438157.post-6101490854635104494" , "objectType" : "notification" , "author" : "Ross Mason" , "content" : { "text" : "There is a great post by Mike Cannon-Brookes of Altassian, which talks about how they came up with the stellar business strategy that has that has dri..." , "url" : "tag:blogger.com,1999:blog-1425601518852438157.post-6101490854635104494" , "urlLinkName" : "Complete News Article"}} , "published" : { "$date" : "2008-12-12T13:22:00.000Z"} , "target" : "public"}
NASA 饲料（不工作）...来自http://www.nasa.gov/rss/dyn/break_news.rss
org.mule.DefaultMuleMessage
{
id=f33625a5-e97a-11e2-aeec-ff1013508cd8
payload=org.mule.transport.http.ReleasingInputStream
correlationId=<not set>
correlationGroup=-1
correlationSeq=-1
encoding=utf-8
exceptionPayload=<not set>
Message properties:
INVOCATION scoped properties:
INBOUND scoped properties:
Cache-Control=no-cache, must-revalidate, post-check=0, pre-check=0
Connection=true
Content-Language=en
Content-Length=6831
Content-Type=application/rss+xml; charset=utf-8
Date=Wed, 10 Jul 2013 16:08:07 GMT
ETag="1373472427"
Expires=Sun, 19 Nov 1978 05:00:00 GMT
Keep-Alive=true
Last-Modified=Wed, 10 Jul 2013 16:07:07 +0000
MULE_ORIGINATING_ENDPOINT=endpoint.http.www.nasa.gov.rss.dyn.breaking.news.rss
Server=nginx/1.4.1
Vary=Accept-Encoding
Via=1.0 690ebb4ae180f02f630cd90d73b6bc50.cloudfront.net (CloudFront)
X-Amz-Cf-Id=nyC1SZiI_0AKB7EUZ1S6w53_TGV3BrsDlY0vpxPpQ0xLXv4KKGRn-g==
X-Cache=RefreshHit from cloudfront
X-Powered-By=PHP/5.3.10-1ubuntu3.6
http.headers={Content-Language=en, ETag="1373472427", Content-Length=6831, Expires=Sun, 19 Nov 1978 05:00:00 GMT, Last-Modified=Wed, 10 Jul 2013 16:07:07 +0000, X-Amz-Cf-Id=nyC1SZiI_0AKB7EUZ1S6w53_TGV3BrsDlY0vpxPpQ0xLXv4KKGRn-g==, Connection=true, Server=nginx/1.4.1, X-Powered-By=PHP/5.3.10-1ubuntu3.6, X-Cache=RefreshHit from cloudfront, Cache-Control=no-cache, must-revalidate, post-check=0, pre-check=0, Date=Wed, 10 Jul 2013 16:08:07 GMT, Vary=Accept-Encoding, Keep-Alive=true, Via=1.0 690ebb4ae180f02f630cd90d73b6bc50.cloudfront.net (CloudFront), Content-Type=application/rss+xml; charset=utf-8}
http.method=GET
http.query.params={}
http.query.string=
http.request=http://www.nasa.gov/rss/dyn/breaking_news.rss
http.status=200
http.version=HTTP/1.0
OUTBOUND scoped properties:
MULE_ENCODING=utf-8
********************************************************************************
Message : null (java.lang.NullPointerException). Message payload is of type: ReleasingInputStream
Code : MULE_ERROR--2
--------------------------------------------------------------------------------
Exception stack is:
1. null (java.lang.NullPointerException)
org.mule.module.rss.routing.FeedSplitter$EntryComparator:121 (null)
2. null (java.lang.NullPointerException). Message payload is of type: ReleasingInputStream (org.mule.api.MessagingException)
org.mule.execution.ExceptionToMessagingExceptionExecutionInterceptor:35 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/MessagingException.html)
--------------------------------------------------------------------------------
Root Exception stack trace:
java.lang.NullPointerException
at org.mule.module.rss.routing.FeedSplitter$EntryComparator.compare(FeedSplitter.java:121)
at org.mule.module.rss.routing.FeedSplitter$EntryComparator.compare(FeedSplitter.java:117)
at java.util.TreeMap.put(TreeMap.java:530)
+ 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
********************************************************************************
org.mule.api.processor.LoggerMessageProcessor:
org.mule.DefaultMuleMessage
{
id=16f3ed76-e97b-11e2-aeec-ff1013508cd8
payload=org.mule.transport.http.ReleasingInputStream
correlationId=<not set>
correlationGroup=-1
correlationSeq=-1
encoding=utf-8
exceptionPayload=<not set>
Message properties:
INVOCATION scoped properties:
INBOUND scoped properties:
Cache-Control=no-cache, must-revalidate, post-check=0, pre-check=0
Connection=true
Content-Encoding=gzip
Content-Language=en
Content-Length=2118
Content-Type=application/rss+xml; charset=utf-8
Date=Wed, 10 Jul 2013 16:09:13 GMT
ETag="1373472468"
Expires=Sun, 19 Nov 1978 05:00:00 GMT
Keep-Alive=true
Last-Modified=Wed, 10 Jul 2013 16:07:48 +0000
MULE_ORIGINATING_ENDPOINT=endpoint.http.www.nasa.gov.rss.dyn.breaking.news.rss
Server=nginx/1.4.1
Vary=Accept-Encoding
Via=1.0 0fc90446797ad54b123cb72bd8f4f142.cloudfront.net (CloudFront)
X-Amz-Cf-Id=83X6Bc8fZjAU98-991DN8rnruZDRNw9O_N_W0eXI7iHv7Z7N5aurZg==
X-Cache=Miss from cloudfront
X-Powered-By=PHP/5.3.10-1ubuntu3.6
http.headers={Content-Language=en, ETag="1373472468", Content-Length=2118, Expires=Sun, 19 Nov 1978 05:00:00 GMT, Last-Modified=Wed, 10 Jul 2013 16:07:48 +0000, X-Amz-Cf-Id=83X6Bc8fZjAU98-991DN8rnruZDRNw9O_N_W0eXI7iHv7Z7N5aurZg==, Connection=true, X-Powered-By=PHP/5.3.10-1ubuntu3.6, Server=nginx/1.4.1, X-Cache=Miss from cloudfront, Cache-Control=no-cache, must-revalidate, post-check=0, pre-check=0, Date=Wed, 10 Jul 2013 16:09:13 GMT, Vary=Accept-Encoding, Content-Encoding=gzip, Keep-Alive=true, Via=1.0 0fc90446797ad54b123cb72bd8f4f142.cloudfront.net (CloudFront), Content-Type=application/rss+xml; charset=utf-8}
http.method=GET
http.query.params={}
http.query.string=
http.request=http://www.nasa.gov/rss/dyn/breaking_news.rss
http.status=200
http.version=HTTP/1.0
OUTBOUND scoped properties:
MULE_ENCODING=utf-8org.mule.exception.DefaultMessagingExceptionStrategy:
********************************************************************************
Message : Invalid XML: Error on line 1: Content is not allowed in prolog. (com.sun.syndication.io.ParsingFeedException)
Code : MULE_ERROR--2
--------------------------------------------------------------------------------
Exception stack is:
1. Content is not allowed in prolog. (org.xml.sax.SAXParseException)
org.apache.xerces.util.ErrorHandlerWrapper:-1 (null)
2. Error on line 1: Content is not allowed in prolog. (org.jdom.input.JDOMParseException)
org.jdom.input.SAXBuilder:533 (null)
3. Invalid XML: Error on line 1: Content is not allowed in prolog. (com.sun.syndication.io.ParsingFeedException)
com.sun.syndication.io.WireFeedInput:182 (null)
4. Invalid XML: Error on line 1: Content is not allowed in prolog. (com.sun.syndication.io.ParsingFeedException) (org.mule.api.transformer.TransformerException)
org.mule.module.rss.transformers.ObjectToRssFeed:85 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/transformer/TransformerException.html)
--------------------------------------------------------------------------------
Root Exception stack trace:
org.xml.sax.SAXParseException: Content is not allowed in prolog.
at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
+ 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
ESPN 饲料（不工作）...
from... http://search.espn.go.com/rss/bill-simmons/
org.mule.api.processor.LoggerMessageProcessor:
org.mule.DefaultMuleMessage
{
id=32be248e-e97a-11e2-9817-fb41b80baff3
payload=org.mule.transport.http.ReleasingInputStream
correlationId=<not set>
correlationGroup=-1
correlationSeq=-1
encoding=iso-8859-1
exceptionPayload=<not set>
Message properties:
INVOCATION scoped properties:
INBOUND scoped properties:
Cache-Control=max-age=600
Connection=true
Content-Type=text/xml; charset=iso-8859-1
Date=Wed, 10 Jul 2013 16:03:03 GMT
Keep-Alive=true
MULE_ORIGINATING_ENDPOINT=endpoint.http.search.espn.go.com.rss.bill.simmons
P3P=CP="CAO DSP COR CURa ADMa DEVa TAIa PSAa PSDa IVAi IVDi CONi OUR SAMo OTRo BUS PHY ONL UNI PUR COM NAV INT DEM CNT STA PRE"
Set-Cookie=[Lorg.apache.commons.httpclient.Cookie;@b07c615
Transfer-Encoding=chunked
http.headers={Transfer-Encoding=chunked, Date=Wed, 10 Jul 2013 16:03:03 GMT, P3P=CP="CAO DSP COR CURa ADMa DEVa TAIa PSAa PSDa IVAi IVDi CONi OUR SAMo OTRo BUS PHY ONL UNI PUR COM NAV INT DEM CNT STA PRE", Keep-Alive=true, Set-Cookie=[Lorg.apache.commons.httpclient.Cookie;@b07c615, Connection=true, Content-Type=text/xml; charset=iso-8859-1, Cache-Control=max-age=600}
http.method=GET
http.query.params={}
http.query.string=
http.request=http://search.espn.go.com/rss/bill-simmons/
http.status=200
http.version=HTTP/1.1
OUTBOUND scoped properties:
MULE_ENCODING=iso-8859-1
org.mule.exception.DefaultMessagingExceptionStrategy:
********************************************************************************
Message : null (java.lang.NullPointerException). Message payload is of type: ReleasingInputStream
Code : MULE_ERROR--2
--------------------------------------------------------------------------------
Exception stack is:
1. null (java.lang.NullPointerException)
org.mule.module.rss.routing.FeedSplitter$EntryComparator:121 (null)
2. null (java.lang.NullPointerException). Message payload is of type: ReleasingInputStream (org.mule.api.MessagingException)
org.mule.execution.ExceptionToMessagingExceptionExecutionInterceptor:35 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/MessagingException.html)
--------------------------------------------------------------------------------
Root Exception stack trace:
java.lang.NullPointerException
at org.mule.module.rss.routing.FeedSplitter$EntryComparator.compare(FeedSplitter.java:121)
at org.mule.module.rss.routing.FeedSplitter$EntryComparator.compare(FeedSplitter.java:117)
at java.util.TreeMap.put(TreeMap.java:530)
+ 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
********************************************************************************
EntryReceiver 类片段...
public class EntryReceiver {
public String readEntry(@Payload SyndEntry entry) throws Exception
{
char[] descCharArray = entry.getDescription().getValue().toString().toCharArray();
String summary = "";
int contentLength = entry.getDescription().getValue().toString().length();
for (int i = 0; i < contentLength; i++){
if(i == 150) break;
else{
summary = summary + descCharArray[i];
}
}
summary = summary.replaceAll("\\<[^>]*>","");
BasicDBObject activity = new BasicDBObject();
activity.put("priority", new Double(0.1) );
// ACTOR
BasicDBObject actor = new BasicDBObject();
actor.put("objectType", "person");
actor.put("id", entry.getAuthor());
actor.put("displayName", entry.getTitle());
activity.put("actor", actor);
activity.put("verb", "post");
// OBJECT
BasicDBObject object = new BasicDBObject();
object.put("url", entry.getUri());
object.put("objectType", "notification");
object.put("author", entry.getAuthor());
activity.put("object", object);
activity.put("published", entry.getPublishedDate());
activity.put("target", "public");
return activity.toString();
}
}