Thanks. The StreamingParser works considerably better (if a little
slower). Note that the xPath expression must be "//featureMember"
(without the prefix).
I also tried "Alternative 2: Ignoring the Application Schema", but this
didn't work. I get
org.xml.sax.SAXException: Handler for wfs:FeatureCollection could not be
found.
at
org.geotools.xml.impl.ParserHandler.startElement(ParserHandler.java:357)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown
Source)
at ...
I don't understand why the parser requires a handler for
"wfs:FeatureCollection" if I tell it to ignore the schema? When I use
the WFSConfiguration (which I created for WFS feature collections)
instead of GMLConfiguration, I get the same exception for the
application schema type, i.e. test:TestFeature in the example.
Any ideas?
Cheers,
Michael
Justin Deoliveira wrote:
> Hi Michael,
>
> I suggest for any reasonable size dataset you use the StreamingParser:
>
> StreamingParser parser =
> new StreamingParser(configuration,"//gml:featureMember");
>
> try{
> Feature f = null;
> while ( ( f = parser.parse() ) != null ) {
> ...
> }
>
> }...
> }
>
> Some more info about streaming here:
>
> http://docs.codehaus.org/display/GEOTDOC/GML+XML+Support
>
> -Justin
>
> Michael Lutz wrote:
>> We are running into big memory problems when trying to parse large GML
>> files containing WFS feature collections (e.g. 25000 points, about 25MB
>> as GML) using the following code:
>>
>> public static FeatureCollection readFromInputStream(InputStream in) {
>> Configuration configuration = new WFSConfiguration();
>> Parser parser = new Parser(configuration);
>> try{
>> FeatureCollection fc = (FeatureCollection) parser.parse( in );
>> in.close();
>> return fc;
>> } ...
>> }
>>
>> For this example, the used memory goes up to 800MB. After the parsing,
>> it goes down again to around 60MB.
>>
>> Any ideas why this is, and where we should be looking for memory leaks?
>>
>> Cheers,
>> Michael
>>
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