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Posted to user@commons.apache.org by simon <sk...@apache.org> on 2007/08/09 15:24:09 UTC
Re: [digester] [chain] Null Pointer Exception on the Digester
parse of the chain-config.xml
Hi Vijay,
When sending an email to this list please put the relevant commons
component name(s) in the subject line. I've done this for this reply..
On Wed, 2007-08-08 at 15:59 -0700, Vijay Balakrishnan wrote:
> I keep getting a Null Pointer Exception on the Digester parse of the
> chain-config.xml.Using Commons Chain 1.1 with the digester jar and beanutils
> and logging jars.
>
> 1. CatalogLoader.java:
>
> public Catalog getCatalog(String configfile) throws Exception {
> ConfigParser parser = new ConfigParser();<== done in Constructor
> CatalogLoader()
> if (catalog == null) {
> URL configFileUrl = FileUtils.findURL("chain-config.xml");//find
> this from claspath
> //Thread.currentThread().getContextClassLoader().getResource(new
> File("chain-config.xml"));
> //<== I am able to see the contents of the chain-config.xml
>
> parser.parse(configFileUrl);<== fails here
>
> }
> catalog = CatalogFactoryBase.getInstance().getCatalog();
> return catalog;
> }
>
>
>
>
>
>
>
> 2. chain-config.xml:
>
> <?xml version="1.0" ?>
> <catalogs>
> <catalog name="sentinel">
> <chain name="loginProcessor">
> <command id="securityEqualsHeaderProcessor" classname="
> com.usbank.aid.chain.SecurityEqualsHeaderProcessor"
> />
> </chain>
> </catalog>
> </catalogs>
>
>
> 3. SecurityEqualsHeaderProcessor.java :
>
> public class SecurityEqualsHeaderProcessor implements Command {
>
> private String oldNames;
> ...
>
>
> I keep getting a Null Pointer Exception. Here is the stack Trace:
>
> at org.apache.commons.digester.Digester.createSAXException(Digester.java
> :3181)
> at org.apache.commons.digester.Digester.createSAXException(Digester.java
> :3207)
> at org.apache.commons.digester.Digester.startElement(Digester.java:1456)
> at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown
> Source)
> at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown
> Source)
> at
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown
> Source)
> at
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
> Source)
> at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
> Source)
> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
> at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
> at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
> at org.apache.commons.digester.Digester.parse(Digester.java:1745)
> at org.apache.commons.chain.config.ConfigParser.parse(ConfigParser.java
> :198)
What version of digester is in your classpath?
The latest release is 1.8, but line 3181 is this one:
return new SAXParseException(error, locator, e);
which shouldn't ever throw a NullPointerException.
I suggest enabling debug-level logging for category
org.apache.commons.digester and sending the last 20 lines or so of the
output to this list too.
Regards,
Simon
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Re: [digester] [chain] Null Pointer Exception on the Digester parse of the chain-config.xml
Posted by Vijay Balakrishnan <bv...@gmail.com>.
After debugging through the Digester 1.8 code,The error ended up being in
the chain-config.xml with a typo on attribute name className. I had it as
classname and that caused the error. One would have thought that the
attribute names are not case sensitive.
Correct version is here :
<?xml version="1.0" ?>
<catalogs>
<catalog name="sentinel">
<chain name="loginProcessor">
<command id="securityEqualsHeaderProcessor"
name="securityEqualsHeaderProcessor" className="
com.usbank.aid.chain.SecurityEqualsHeaderProcessor"
/>
</chain>
</catalog>
</catalogs>
Thanks, Simon for replying to my email.
Vijay
On 8/9/07, simon <sk...@apache.org> wrote:
>
> Hi Vijay,
>
> When sending an email to this list please put the relevant commons
> component name(s) in the subject line. I've done this for this reply..
>
> On Wed, 2007-08-08 at 15:59 -0700, Vijay Balakrishnan wrote:
> > I keep getting a Null Pointer Exception on the Digester parse of the
> > chain-config.xml.Using Commons Chain 1.1 with the digester jar and
> beanutils
> > and logging jars.
>
> >
> > 1. CatalogLoader.java:
> >
> > public Catalog getCatalog(String configfile) throws Exception {
> > ConfigParser parser = new ConfigParser();<== done in Constructor
> > CatalogLoader()
> > if (catalog == null) {
> > URL configFileUrl = FileUtils.findURL("chain-config.xml");//find
> > this from claspath
> > //Thread.currentThread().getContextClassLoader().getResource(new
> > File("chain-config.xml"));
> > //<== I am able to see the contents of the chain-config.xml
> >
> > parser.parse(configFileUrl);<== fails here
> >
> > }
> > catalog = CatalogFactoryBase.getInstance().getCatalog();
> > return catalog;
> > }
> >
> >
> >
> >
> >
> >
> >
> > 2. chain-config.xml:
> >
> > <?xml version="1.0" ?>
> > <catalogs>
> > <catalog name="sentinel">
> > <chain name="loginProcessor">
> > <command id="securityEqualsHeaderProcessor" classname="
> > com.usbank.aid.chain.SecurityEqualsHeaderProcessor"
> > />
> > </chain>
> > </catalog>
> > </catalogs>
> >
> >
> > 3. SecurityEqualsHeaderProcessor.java :
> >
> > public class SecurityEqualsHeaderProcessor implements Command {
> >
> > private String oldNames;
> > ...
> >
> >
> > I keep getting a Null Pointer Exception. Here is the stack Trace:
> >
> > at org.apache.commons.digester.Digester.createSAXException(Digester.java
> > :3181)
> > at org.apache.commons.digester.Digester.createSAXException(
> Digester.java
> > :3207)
> > at org.apache.commons.digester.Digester.startElement(Digester.java
> :1456)
> > at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown
> > Source)
> > at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement
> (Unknown
> > Source)
> > at
> > org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement
> (Unknown
> > Source)
> > at
> >
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch
> (Unknown
> > Source)
> > at
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
> > Source)
> > at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
> Source)
> > at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
> Source)
> > at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
> > at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
> > at org.apache.commons.digester.Digester.parse(Digester.java:1745)
> > at org.apache.commons.chain.config.ConfigParser.parse(
> ConfigParser.java
> > :198)
>
>
>
> What version of digester is in your classpath?
>
> The latest release is 1.8, but line 3181 is this one:
> return new SAXParseException(error, locator, e);
> which shouldn't ever throw a NullPointerException.
>
>
> I suggest enabling debug-level logging for category
> org.apache.commons.digester and sending the last 20 lines or so of the
> output to this list too.
>
> Regards,
>
> Simon
>
>
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>
>