problems with jboss an xerces

[koslows]

Dear All!

I'm writing a business method of an entity bean which is supposed to
read some informations from an XML file. I use the following code:

To get the parser and the document:
Code:

DocumentBuilderFactory factory =
DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse( xmlFile );

Then to get the informations I use:

Code:

NodeList nl = doc.getElementsByTagName( tagName );
int elemCount = nl.getLength();
for( int i = 0; i < elemCount; i++ )
{
Element element = ( Element )nl.item( i );
String test = element.getTextContent();
(...)
}

And I get the folowing exception:
Code:

org.jboss.tm.JBossTransactionRolledbackException: Unexpected Error
java.lang.NoSuchMethodError:
org.w3c.dom.Node.getTextContent()Ljava/lang/String;
at
levia.messages.ejb.MessageTypeBean.requiredInformations(MessageTypeBean.java:345)
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:585)

The problem is that outside Jboss this works perfectly. So I guess the
problems comes from the fact that jboss uses xerces itself and it
configures diferently the parser or something like this...

When I write :
Code:

Text tester = (Text) elem.getFirstChild();
String blalba = tester.getNodeValue();

everything works well.... but still I would like to understand what is
the couse of problems with the other solution.

kind regards

Karol

PS: I use jboss 4.0 and xerces 2.6.2

 

[Raymond DeCampo]

org.jboss.tm.JBossTransactionRolledbackException: Unexpected Error
java.lang.NoSuchMethodError:
org.w3c.dom.Node.getTextContent()Ljava/lang/String;
at
levia.messages.ejb.MessageTypeBean.requiredInformations(MessageTypeBean.java:345)
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:585)

The problem is that outside Jboss this works perfectly. So I guess the
problems comes from the fact that jboss uses xerces itself and it
configures diferently the parser or something like this...

org.w3c.dom.Node.getTextContent() is documented as being in for DOM
level 3. Apparently the version of xerces within JBoss does not support
this method. Presumably the JBoss xerces is a lower version than the
one you explicitly included.

You could try swapping in your xerces.jar for the one JBoss is using,
although, there is a risk this will cause other problems.

Ray

 

[koslows]

Ok, but I guess it should be possible to "force" jboss to use any
version of xerces it wants and let my application to use another no ?

kind regards

k.

 

[Raymond DeCampo]

Ok, but I guess it should be possible to "force" jboss to use any
version of xerces it wants and let my application to use another no ?

I would expect not, because of the way XML parser registration works.
XML parser registration is essential global to the JVM, so even the
usual classloader barriers that application servers use do not allow you
to use another.

OTOH, the risk in dropping in your desired version of xerces in place of
the JBoss supplied one should be rather small. Just be aware that it
exists.

HTH,
Ray

 

[koslows]

Ok thx. it worked. It seems that there is no problem with jboss.

Although I had to use the xerces 2.7.0 because with 2.6.2 it didnt'
work.

kind regards