storing, retrieving and deleting works always fine, but the qerry and update tests fail very often, but sometimes the succeeded.
junit tests:
public void testQuery()
{
try
{
String xpath = null;
String[] result = null; // Suche nach allen Addressen
xpath = "/addresses";
result = this.query(xpath);
assertTrue("no results found ",result.length > 0); // Suche nach Adresse mit id 1
xpath = "/addresses/[EMAIL PROTECTED]";
result = this.query(xpath); for(int i = 0; i < result.length; i++)
{
Document found = null; try
{
found = DOMParser.toDocument(result[i]);
assertNotNull("dom document is null",found);
}
catch (Exception exc)
{
fail("could not create dom document from found xml string");
}assertEquals("id",
found.getFirstChild().getAttributes().getNamedItem("id").getNodeValue(),
"1");
}
// Suche nach Element
xpath = "/addresses/address/phone";
result = this.query(xpath);
System.out.println("xpath = " + xpath);
System.out.println("result length: " + result.length);
assertEquals("3. query",2, result.length); for(int i = 0; i < result.length; i++)
{
System.out.println("result: " + result[i]);
} // Suche nach Element mit Attribut
xpath = "/addresses/address/[EMAIL PROTECTED]'home']";
result = this.query(xpath);
System.out.println("xpath = " + xpath);
System.out.println("result length: " + result.length);
assertEquals("4. query", result.length,1); for(int i = 0; i < result.length; i++)
{
System.out.println("result: " + result[i]);
}
} catch (ResourceException exc) { fail("could not query db\r\n" + exc.toString()); } }
public void testXUpdate()
{
long count = 0;
String xupdate = null;
String[] result = null;
String prefix =
"<xupdate:modifications version=\"1.0\" xmlns:xupdate=\"http://www.xmldb.org/xupdate\";>";
String suffix =
"</xupdate:modifications>";
// 1. Insert Element Before
xupdate = "<xupdate:insert-before select=\"/addresses/[EMAIL PROTECTED] = 1]/name/last\" >" +
" <xupdate:element name=\"middle\">Lennox</xupdate:element>" +
"</xupdate:insert-before>";
try
{
count = this.xupdate(id,prefix + xupdate + suffix);
assertEquals("updated nodes",1,count);
result = this.query("/addresses/[EMAIL PROTECTED]");
}
catch (ResourceException exc)
{
fail("could not access db\r\n" + exc.toString());
} for(int i = 0; i < result.length; i++)
{
System.out.println(i + ". result: " + result[i]);
}// 2. Insert Element After
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>";
try
{
count = this.xupdate(id,prefix + xupdate + suffix);
System.out.println("xupdate 2");
assertEquals("updated nodes",1,count);
result = this.query("/addresses/[EMAIL PROTECTED]");
}
catch (ResourceException exc)
{
fail("could not access db\r\n" + exc.toString());
} for(int i = 0; i < result.length; i++)
{
System.out.println(i + ". result: " + result[i]);
}// 3. Append Element
xupdate = "<xupdate:append select=\"/addresses/[EMAIL PROTECTED] = 1]\" >" +
" <xupdate:element name=\"zip\">90200</xupdate:element>" +
"</xupdate:append>";
try
{
count = this.xupdate(id,prefix + xupdate + suffix);
assertEquals("updated nodes",1,count);
result = this.query("/addresses/[EMAIL PROTECTED]");
}
catch (ResourceException exc)
{
fail("could not access db\r\n" + exc.toString());
} for(int i = 0; i < result.length; i++)
{
System.out.println(i + ". result: " + result[i]);
}// 4.Insert attribute
xupdate = "<xupdate:append select=\"/addresses/[EMAIL PROTECTED] = 1]/[EMAIL PROTECTED]'work']\" >" +
" <xupdate:attribute name=\"extension\">223</xupdate:attribute>" +
"</xupdate:append>";
try
{
count = this.xupdate(id,prefix + xupdate + suffix);
assertEquals("updated nodes",1,count);
result = this.query("/addresses/[EMAIL PROTECTED]");
}
catch (ResourceException exc)
{
fail("could not access db\r\n" + exc.toString());
} for(int i = 0; i < result.length; i++)
{
System.out.println(i + ". result: " + result[i]);
}// 5.Insert Text Content
xupdate = "<xupdate:append select=\"/addresses/[EMAIL PROTECTED] = 1]/country\" >" +
" <xupdate:text> of America</xupdate:text>" +
"</xupdate:append>";
try
{
count = this.xupdate(id,prefix + xupdate + suffix);
assertEquals("updated nodes",1,count);
result = this.query("/addresses/[EMAIL PROTECTED]");
}
catch (ResourceException exc)
{
fail("could not access db\r\n" + exc.toString());
} for(int i = 0; i < result.length; i++)
{
System.out.println(i + ". result: " + result[i]);
}// 6. Insert XML Block
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>";
try
{
count = this.xupdate(id,prefix + xupdate + suffix);
assertEquals("updated nodes",1,count);
result = this.query("/addresses/[EMAIL PROTECTED]");
}
catch (ResourceException exc)
{
fail("could not access db\r\n" + exc.toString());
} for(int i = 0; i < result.length; i++)
{
System.out.println(i + ". result: " + result[i]);
}
}
<========the query and xupdate methods to test are here:
<========
private String[] query(String xPathExpr)
throws ResourceException
{
try
{
// this.con holds a org.xmldb.api.base.Collection
XPathQueryService service =
(XPathQueryService) this.con.getService("XPathQueryService", "1.0");
ResourceSet resultSet = service.query(xPathExpr);
LinkedList returnList = new LinkedList();
ResourceIterator results = resultSet.getIterator(); while (results.hasMoreResources())
{
Resource res = results.nextResource();
returnList.add((String) res.getContent());
}return (String[]) returnList.toArray(new String[]{});
}
catch (XMLDBException e)
{
ResourceException exception = new ResourceException("XML:DB Exception occured " + e.errorCode);
exception.setLinkedException(e);
throw exception;
}
}
private long xupdate(String id, String xUpdateExpr)
throws ResourceException
{
try
{
// this.con holds a org.xmldb.api.base.Collection
XUpdateQueryService service =
(XUpdateQueryService) this.con.getService("XUpdateQueryService", "1.0");
return con
}
catch (XMLDBException exc)
{
ResourceException exception = new ResourceException("XML:DB Excpetion occured " + exc.errorCode);
exception.setLinkedException(exc);
throw exception;
}
}
<========
the errormessage thrown by xindice-server is the same as posted before (see below).
Any idea how to solve this? any fixes available?
greetings jens
Jeff Greif wrote:
From the stack trace, it appears that the XUpdate has found some documents to modify, and breaks trying to retrieve them to carry out the modifications, owing to some failure to retrieve from the collection's document cache.
Just looking at the stack trace and a little source code, I would guess there is a bug in Xindice, probably in the DocumentCache implementation, but possibly higher up in the XPathQueryResolver. My guess is that the org.apache.xindice.core.DocumentCache.CacheKey.equals needs to test for null before trying to extract parts of the two objects being compared, especially since the DocumentCache uses a WeakHashMap from which the garbage collector may delete keys at arbitrary times. This may explain the intermittency of the appearance of the bug.
I don't know enough about WeakHashMaps to be authoritative, but the class documentation describes them as best suited for keys that are immutable and can be compared using ==. This is not the way that class is being used in DocumentCache, but that in itself doesn't mean that it is being misused, just that the usage should be checked.
Hope this proves helpful and not misleading.
Jeff ----- Original Message ----- From: "Mark J. Stang" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, June 20, 2002 6:28 AM Subject: Re: sudden errors while xupdate
Is it the same query always? When it fails is the query different. Sounds like the XPath part of your XUpdate is failing...
Does the query work sometimes?
Can you provide the query and the document so the list can look at it?
thanks,
Mark
Jens Kumpfmueller wrote:
Hi *,
finally i managed it to start the xindice-server. When i'm trying to do some xupdates (mentioned on http://www.xmldatabases.org/projects/XUpdate-UseCases/ ), 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(X PathQueryResolver.java:1003)
at
org.apache.xindice.core.query.XPathQueryResolver$ResultSet.<init>(XPathQuery Resolver.java:995)
at
org.apache.xindice.core.query.XPathQueryResolver$XPathQuery.execute(XPathQue ryResolver.java:247)
at
org.apache.xindice.core.query.XPathQueryResolver.query(XPathQueryResolver.ja va: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(XU pdateQueryResolver.java:172)
at
org.apache.xindice.core.xupdate.XUpdateQueryResolver.query(XUpdateQueryResol ver.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(Collection Servant.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:75 0)
at
org.openorb.net.ServerManagerImpl.serve_request(ServerManagerImpl.java:1467)
at
org.openorb.net.ServerManagerImpl.thread_pool_main(ServerManagerImpl.java:14 10)
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
-- Mark J Stang Software Architect Cybershop Systems
