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Date: Fri, 1 Apr 2011 01:00:04 +0200
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Subject: Re: [digester] NullPointerException
From: Simone Tripodi <simonetripodi@apache.org>
To: Commons Users List <user@commons.apache.org>
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Patrick,
just replace

71    digester.addObjectCreate("collection", XMLReader.class);

with

    digester.push(this);



Otherwise

30    ArrayList<ArrayList<String>> docs;

with

30    ArrayList<ArrayList<String>> docs = new ArrayList<ArrayList<String>>();

and remove line 64

I suggest you the first option

Simo

http://people.apache.org/~simonetripodi/
http://www.99soft.org/



On Fri, Apr 1, 2011 at 12:36 AM, Patrick Diviacco
<patrick.diviacco@gmail.com> wrote:
> Sure, here you are
>
> http://dl.dropbox.com/u/72686/trainSmall.xml
>
> and
>
> http://dl.dropbox.com/u/72686/testSmall.xml
>
> I was wondering if the issue is that XMLReader has been created as static
> object...
>
> thanks
>
>
> On 1 April 2011 00:26, Simone Tripodi <simonetripodi@apache.org> wrote:
>
>> Hi Patrick,
>> can you link also to the XML you're trying to parse?
>> Simo
>>
>> http://people.apache.org/~simonetripodi/
>> http://www.99soft.org/
>>
>>
>>
>> On Thu, Mar 31, 2011 at 10:24 PM, Patrick Diviacco
>> <patrick.diviacco@gmail.com> wrote:
>> > Hi,
>> >
>> > I'm trying to store the content of a xml file into memory but for some
>> > reason I get following NullPointerException.. (this is the code:
>> > http://pastie.org/1740948):
>> >
>> > Clusterer...
>> > Reading XML...
>> > Mar 31, 2011 10:19:17 PM org.apache.commons.digester.Digester endElement
>> > SEVERE: End event threw exception
>> > java.lang.reflect.InvocationTargetException
>> > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> > at
>> >
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>> > at
>> >
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>> > at java.lang.reflect.Method.invoke(Method.java:597)
>> > at
>> >
>> org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.java:216)
>> > at org.apache.commons.digester.SetNextRule.end(SetNextRule.java:220)
>> > at org.apache.commons.digester.Rule.end(Rule.java:257)
>> > at org.apache.commons.digester.Digester.endElement(Digester.java:1345)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:601)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1782)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2938)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
>> > at org.apache.commons.digester.Digester.parse(Digester.java:1871)
>> > at XMLReader.read(XMLReader.java:74)
>> > at Clusterer.<init>(Clusterer.java:49)
>> > at Main.main(Main.java:11)
>> > Caused by: java.lang.NullPointerException
>> > at XMLReader$FlickrCollection.addDocument(XMLReader.java:108)
>> > ... 22 more
>> > java.lang.NullPointerException
>> > at
>> >
>> org.apache.commons.digester.Digester.createSAXException(Digester.java:3363)
>> > at
>> >
>> org.apache.commons.digester.Digester.createSAXException(Digester.java:3389)
>> > at org.apache.commons.digester.Digester.endElement(Digester.java:1348)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:601)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1782)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2938)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
>> > Reading XML...
>> > at
>> >
>> com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
>> > at org.apache.commons.digester.Digester.parse(Digester.java:1871)
>> > at XMLReader.read(XMLReader.java:74)
>> > at Clusterer.<init>(Clusterer.java:49)
>> > at Main.main(Main.java:11)
>> > Caused by: java.lang.NullPointerException
>> > at XMLReader$FlickrCollection.addDocument(XMLReader.java:108)
>> > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> > at
>> >
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>> > at
>> >
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>> > at java.lang.reflect.Method.invoke(Method.java:597)
>> > at
>> >
>> org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.java:216)
>> > at org.apache.commons.digester.SetNextRule.end(SetNextRule.java:220)
>> > at org.apache.commons.digester.Rule.end(Rule.java:257)
>> > at org.apache.commons.digester.Digester.endElement(Digester.java:1345)
>> > ... 14 more
>> > Mar 31, 2011 10:19:17 PM org.apache.commons.digester.Digester endElement
>> > SEVERE: End event threw exception
>> > java.lang.reflect.InvocationTargetException
>> > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> > at
>> >
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>> > at
>> >
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>> > at java.lang.reflect.Method.invoke(Method.java:597)
>> > at
>> >
>> org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.java:216)
>> > at org.apache.commons.digester.SetNextRule.end(SetNextRule.java:220)
>> > at org.apache.commons.digester.Rule.end(Rule.java:257)
>> > at org.apache.commons.digester.Digester.endElement(Digester.java:1345)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:601)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1782)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2938)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
>> > at org.apache.commons.digester.Digester.parse(Digester.java:1871)
>> > at XMLReader.read(XMLReader.java:74)
>> > at Clusterer.<init>(Clusterer.java:50)
>> > at Main.main(Main.java:11)
>> > Caused by: java.lang.NullPointerException
>> > at XMLReader$FlickrCollection.addDocument(XMLReader.java:108)
>> > ... 22 more
>> > java.lang.NullPointerException
>> > at
>> >
>> org.apache.commons.digester.Digester.createSAXException(Digester.java:3363)
>> > at
>> >
>> org.apache.commons.digester.Digester.createSAXException(Digester.java:3389)
>> > at org.apache.commons.digester.Digester.endElement(Digester.java:1348)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:601)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1782)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2938)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
>> > at
>> >
>> com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
>> > at org.apache.commons.digester.Digester.parse(Digester.java:1871)
>> > at XMLReader.read(XMLReader.java:74)
>> > at Clusterer.<init>(Clusterer.java:50)
>> > at Main.main(Main.java:11)
>> > Caused by: java.lang.NullPointerException
>> > at XMLReader$FlickrCollection.addDocument(XMLReader.java:108)
>> > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> > at
>> >
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>> > at
>> >
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>> > at java.lang.reflect.Method.invoke(Method.java:597)
>> > at
>> >
>> org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.java:216)
>> > at org.apache.commons.digester.SetNextRule.end(SetNextRule.java:220)
>> > at org.apache.commons.digester.Rule.end(Rule.java:257)
>> > []
>> > []
>> > at org.apache.commons.digester.Digester.endElement(Digester.java:1345)
>> > ... 14 more
>> >
>>
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