Display Clob / XML in jsf page : Java JEE JSF

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04.29.2008 at 01:02AM PDT, ID: 23361287

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7.8

Display Clob / XML in jsf page

Zones: Java Standard Tag Library (JSTL) & Server Tags, Java Server Pages (JSP), Enterprise Java Beans (EJB)

Tags: Java JEE JSF

Hi,

I want to display the content of a clob in a jsf via jstl.

I have a DB interface via JPA an modeled a DBSchema which a field contains XML (XMLType)
Now I want to use a Bean to display this via jstl in my webpage.
As the code shows, it workt well for standard types as Strings,Numbers and so
But how can I show the clob object. it always displays me the name of the class(oracle.xml.parser.v2.XMLDocument@xxxxx) or sth.
I using EclipseLink, and the XMLType is supported.

Anyone nows how tho handle that

rgds,
- Mark

         
           
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             // extract of my Table Class
private String xmlData;
 
	@Lob
	@Column(name = "XMLDATA", ... )
	public Clob getXmlData() {
		return this.xmlData;
	}
 
	public void setField(String xmlData) {
		this.xmlData = xmlData;
	}
 
// extract of my jsf
 
	<c:forEach var="item" items="#{TestBean.EntryList}">
		<tr>
		<td>${item.foId}</td>
		<td>${item.foName}	</td>
		</tr>
		<tr>
		<td colspan="2">
			${item.xmlData}
		</td></tr>
	</c:forEach>

           
         

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Question Stats

Zone: Programming

Question Asked By: BitBreaker

Solution Provided By: aiklamha

Participating Experts: 1

Solution Grade: B

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EE Bugs

04.29.2008 at 01:17AM PDT, ID: 21460390

aiklamha:

use oracle.ide.xml.XMLUtil class's toString(oracle.xml.parser.v2.XMLDocument xmlDocument) method... to get the string

04.29.2008 at 01:29AM PDT, ID: 21460447

BitBreaker:

first a little correction of the snippet above

      public Clob getXmlData() {
            return this.xmlData;
      }
should be
      public String getXmlData() {
            return this.xmlData;
      }

@aiklamha
and how should i do this ??
I guess the interface is generated with methods for java.lan.string, and I think the framework calls the toString method, and i don't know how to overwrite this ?? I think in the background it works fine, but if I change the parameter from string to lets say ...w3c.Document, or ...parser.v2.XMLDocument i get an converstion/validation exception

rgds
- Mark

04.29.2008 at 01:37AM PDT, ID: 21460477

aiklamha:

XMLDocument doesn't have an overridden toString method.. if you want to override.. you need to extend oracle.xml.parser.v2.XMLDocument and implement your own toString method...

by the way.. .where have you used instance of oracle.xml.parser.v2.XMLDocument ??
what is the type of table column?

04.29.2008 at 01:54AM PDT, ID: 21460530

BitBreaker:

The type is a XMLType on ana oracle 10g.
I use Eclipse, and do a reverse engineering of the DB schema, It generates me the DAO classes, and the bean for this table with getters and setters. I changed also from Toplink essentials to Eclipselink, cause Toplink essentials doesn't support the XMLType. I'm a little confused, because I see the JPA framework works correct by seeing that the getter returns (XMLDocument@...). OK there is a XMLdocument. but I don't know how become control of this document.

Another way.
how would you work in this case, if you have such a field in the DB, and want to display that in a jsf.

04.29.2008 at 02:06AM PDT, ID: 21460580

aiklamha:

I didn't work with EclipseLink.. what i am confused about is; if xmlData's class is XMLDocument .. then why EclipseLink generated getter which is returning a Clob....

I would first try to replace Clob with XMLDocument.. replace private String xmlData; to private XMLDocument xmlData... and then in getter method i would use this XMLUtil class or by using print method of XMLDocument to give me actual String data held by xmlData Object ...

04.29.2008 at 02:25AM PDT, ID: 21460666

BitBreaker:

in the code above there is a copy/paste error it doesn't generate me get/set for type clob, thats because of playing around by my site. it generates get/set for string.
I would do this the same way, but it doesn't work ;-(

if I have the String get/set, I become the (XMLDocument@.....)
and if I change the get/set to
your way getter String setter XMLDocument
--
Exception [EclipseLink-7174] (Eclipse Persistence Services - 1.0 (Build SNAPSHOT - 20080409)): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The getter method [public java.lang.String ] on entity class does not have a corresponding setter method defined.
--
and last but not least
getter/setter XMLDocument

javax.servlet.ServletException:
Exception Description: The object [oracle.xml.parser.v2.XMLDocument@6ed3199e], of class [class oracle.xml.parser.v2.XMLDocument], from mapping [org.eclipse.persistence.mappings.DirectToFieldMapping[xmlField-->DB.DBOBJECT.XMLFIELD]] with descriptor [RelationalDescriptor(dbobject --> [DatabaseTable(Y.DBOBJECT)])], could not be converted to [class [B].

???
M.

04.29.2008 at 07:35AM PDT, ID: 21462661

BitBreaker:

Anybody else a solution ??

rgds,
M.

04.29.2008 at 07:55AM PDT, ID: 21462868

aiklamha:

the error gives me the idea that the class XMLDocument you are using in setter or getter is different than the class which EclipseLink is using to map with XMLField internally... well i can't tell any thing more..

see if this can help

http://wiki.eclipse.org/Introduction_to_EclipseLink_Expressions_(ELUG)#XMLType_Functions

http://dev.eclipse.org/newslists/news.eclipse.technology.eclipselink/msg00047.html

Accepted Solution

04.29.2008 at 08:46AM PDT, ID: 21463360

BitBreaker:

Thanks aiklamha !
the Doc in the first link give me a hint how to do this.
in SQL i would use select extract(xmlfield, '/').getStringVal() and I see with ELUG I'm able to do things similar.
anyway I have to find out how I can use and where i can place the Expression Object.

I will give you the Point, because of taking care, and help me find a hint ;-)

rgds,
M.

04.29.2008 at 08:49AM PDT, ID: 21463399

aiklamha:

Glad that helped :-)

20080236-EE-VQP-29 / EE_QW_2_20070628