Re: sudden errors while xupdate

[Jens Kumpfmueller]

it's always the same set of queries (the whole story: i'm writing a 
jca-resource adapter.
To test the adapter i using junit and a stateful session bean.
TestSuite: 1. create a collection, 2. store document, 3. retrieve 
document, 4. query (xpath), 5. query (xupdate), 6. remove document, 7. 
remove collection

This suite returns sometimes with errors in query (xupdate) part.
The document is: (taken (like the xupdate expressions) from 
http://www.xmldatabases.org/projects/XUpdate-UseCases/)

<addresses>
  
  <address id= "1">
     <!--This is the users name-->
     <name>
        <first> John</first>
        <last> Smith</last>
     </name>      
     <city>Houston </city>
     <state>Texas </state>
     <country> United States</country>
     <phone type= "home">333-300-0300 </phone>
     <phone type= "work">333-500-9080 </phone>
     <note><![CDATA[This is a new user]]></note >
  </address>
  
</addresses>

Here are the "core"-xupdate query-strings used in query (xupdate):
     xupdate =   "<xupdate:insert-before 
select=\"/addresses/[EMAIL PROTECTED] = 1]/name/last\" >" +
                 "  <xupdate:element 
name=\"middle\">Lennox</xupdate:element>" +
                 "</xupdate:insert-before>";

     xupdate =   "<xupdate:insert-after select=\"/addresses/[EMAIL PROTECTED] 
= 1]/[EMAIL PROTECTED]'home']\">" +
                 "  <xupdate:element name=\"phone\"><xupdate:attribute 
name=\"type\">cell</xupdate:attribute>490-494-4904</xupdate:element>" +
                 "</xupdate:insert-after>";

     xupdate =   "<xupdate:append select=\"/addresses/[EMAIL PROTECTED] = 
1]\" >" +
                 "  <xupdate:element 
name=\"zip\">90200</xupdate:element>" +
                 "</xupdate:append>";

     xupdate =   "<xupdate:append select=\"/addresses/[EMAIL PROTECTED] = 
1]/[EMAIL PROTECTED]'work']\" >" +
                 "  <xupdate:attribute 
name=\"extension\">223</xupdate:attribute>" +
                 "</xupdate:append>";

     xupdate =   "<xupdate:append select=\"/addresses/[EMAIL PROTECTED] = 
1]/country\" >" +
                 "  <xupdate:text> of America</xupdate:text>" +
                 "</xupdate:append>";

     xupdate =   "<xupdate:append select=\"/addresses\" >" +
                 "  <xupdate:element name=\"address\">" +
                 "     <xupdate:attribute 
name=\"id\">2</xupdate:attribute>" +
                 "     <name>" +
                 "        <first>Susan</first>" +
                 "        <last>Long</last>" +
                 "     </name>" +
                 "     <city>Tucson</city>" +
                 "     <state>Arizona</state>" +
                 "     <country>United States</country>" +
                 "     <phone type=\"home\">430-304-3040</phone>" +
                 "  </xupdate:element>" +
                 "</xupdate:append>";

sometimes
everything is ok, all xupdates are done. but sometimes i got this error:
java.lang.NullPointerException
       at
org.apache.xindice.core.DocumentCache$CacheKey.equals(DocumentCache.java:171)
       at java.util.WeakHashMap.eq(WeakHashMap.java:256)
       at java.util.WeakHashMap.get(WeakHashMap.java:348)
       at
org.apache.xindice.core.DocumentCache.getDocument(DocumentCache.java:79)
       at
org.apache.xindice.core.Collection.getDocument(Collection.java:711)
       at
org.apache.xindice.core.query.XPathQueryResolver$ResultSet.prepareNextNode(XPathQueryResolver.java:1003)
       at
org.apache.xindice.core.query.XPathQueryResolver$ResultSet.<init>(XPathQueryResolver.java:995)
       at
org.apache.xindice.core.query.XPathQueryResolver$XPathQuery.execute(XPathQueryResolver.java:247)
       at
org.apache.xindice.core.query.XPathQueryResolver.query(XPathQueryResolver.java:151)
       at
org.apache.xindice.core.query.QueryEngine.query(QueryEngine.java:147)
       at
org.apache.xindice.core.Collection.queryCollection(Collection.java:847)
       at
org.apache.xindice.core.xupdate.XUpdateImpl.execute(XUpdateImpl.java:185)
       at
org.apache.xindice.core.xupdate.XUpdateQueryResolver$XUpdateQuery.execute(XUpdateQueryResolver.java:172)
       at
org.apache.xindice.core.xupdate.XUpdateQueryResolver.query(XUpdateQueryResolver.java:106)
       at
org.apache.xindice.core.query.QueryEngine.query(QueryEngine.java:147)
       at
org.apache.xindice.core.Collection.queryCollection(Collection.java:847)
       at
org.apache.xindice.client.corba.CollectionServant.queryCollection(CollectionServant.java:424)
       at
org.apache.xindice.client.corba.db.CollectionPOA._invoke(CollectionPOA.java:332)
       at org.openorb.adapter.poa.POA.dispatch(POA.java:975)
       at
org.openorb.net.AbstractServerRequest.dispatch(AbstractServerRequest.java:750)
       at
org.openorb.net.ServerManagerImpl.serve_request(ServerManagerImpl.java:1467)
       at
org.openorb.net.ServerManagerImpl.thread_pool_main(ServerManagerImpl.java:1410)
       at
org.openorb.net.ServerManagerImpl.access$200(ServerManagerImpl.java:77)
       at
org.openorb.net.ServerManagerImpl$PoolThread.run(ServerManagerImpl.java:1557)
i'm using jdk1.4, linux suse 8.0 xindice birdday 1.0 (precompiled)
thx in advance
jens