WPC: Access Java beans from XSL

Hi,
How can we access custom Java beans from within the XSLs used to render WPC webforms? Do we have to implement a custom XSLT Helper? I am able to access standard Java classes using the <xmlns> tag but when I try to reference our custom classes the WPC editor throws a ClassNotFound exception. Any help will be appreciated.
Thanks and Regards,
Shibendra

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Calling Java Function from XSL

I'm trying something I think is fairly simple and keep getting errors during the process. I'm just trying to parse an XML file and call a java method from a simple java program called HelloWorld using an XSL stylesheet.
I get the following error: Error while parsing XSL file (Extension function namespace should start with 'http://www.oracle.com/XSL/Transform/java/'.). Here is my XSL. I know the oracle namespace is not necessary, it was added due to the error I was receiving:
<?xml version = "1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:oracle="http://www.oracle.com/XSL/Transform/java/"
xmlns:xalan="http://xml.apache.org/xalan"
xmlns:redirect="http://xml.apache.org/xalan/redirect"
xmlns:jfctn="com.raytheon.iis.temp.HelloWorld" exclude-result-prefixes="jfctn"
exclude-element-prefixes="oracle redirect"
version='1.0'>
<xsl:template match="/">
<xsl:value-of select="//title"/>
<xsl:value-of select="//author"/>
<xsl:value-of select = "jfctn:hello()"/>
</xsl:template>
</xsl:stylesheet>
Here is my java file:
public class HelloWorld {
public static String hello() {
return "Hello World";
And here is my simple XML file:
<source>
<title>XSL</title>
<author> John
Smith</author>
</source>
Any advice/ideas would be greatly appreciated. Thanks.
Jimmy

After some trials I've come up with a more specific issue regarding this error. Here is my new code that works on a machine that does not have a file called xmlparserv2.jar (In my stack trace I noticed it referring to the oracle.xml.parser.v2 so I'm assuming this file and path setup that refers to this file is the issue). Unfortunately I have other programs that need this file and setup so I was wondering if anyone knew some alternate setup or workaround to resolve this issue.
The following works fine for me using xalan on a server with the most recent jdk 1.4 setup.
Here is the new XSL code similar to the one listed above. The XML is the same as the previous post.
<?xml version = "1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
�xmlns:xalan="http://xml.apache.org/xalan"�
�xmlns:jfctn="xalan://com/raytheon/iis/temp/HelloWorld"
exclude-result-prefixes="jfctn"
�version='1.0'>
<xsl:template match="/">
<xsl:value-of select="//title"/>
<xsl:value-of select="//author"/>
<xsl:value-of select = "jfctn:hello()"/>
</xsl:template>
</xsl:stylesheet>
Here is my transform class
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.*;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import java.net.URL;
import javax.xml.transform.*;
public class SimpleTransform
public SimpleTransform()
public static void main(String args[])
throws TransformerException, TransformerConfigurationException, FileNotFoundException, IOException
TransformerFactory transformerfactory = TransformerFactory.newInstance();
File file = new File("test.xsl");
File file1 = new File("test.xml");
try
URL url = file.toURL();
URL url1 = file1.toURL();
InputStream testXsl = url.openStream();
InputStream testXml = url1.openStream();
Transformer transformer = transformerfactory.newTransformer(new StreamSource(testXsl));
transformer.transform(new StreamSource(testXml), new StreamResult(new FileOutputStream( "test.out")));
System.out.println("************* The result is in test.out *************");
testXsl.close();
testXml.close();
catch(Exception exception)
exception.printStackTrace();
}

Calling Java Bean From JSP

<%@ page contentType="text/html;charset=windows-1252" errorPage = "error.jsp"%>
<%@ page import="java.sql.*,java.io.*,javax.sql.*, mypackage1.*"%>
<html>
<head>
 <meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
 <title>Process</title>
</head>
<body>
 
 Result from the Query
 
 
 
 
 
 
 <%
 int rowsChanged;
 Connection con;
 try
 String sql;
 sql = request.getParameter("query");
 System.out.println(sql);
 session=request.getSession(true);
 String name = (String)session.getAttribute("theID");
 String password = (String)session.getAttribute("paswd");
 String driver="oracle.jdbc.OracleDriver";
 Class.forName(driver);
 String url ="jdbc:oracle:thin:@minerva.humber.ca:1521:grok" ;
 con = DriverManager.getConnection(url,name,password);
 if(sql.substring(0,6).equalsIgnoreCase("Select"))
 Statement stat = con.createStatement();
 ResultSet rs = stat.executeQuery(sql);
 %>
 <jsp:useBean id="myBean" scope="page" class="mypackage1.Table" >
 </jsp:useBean>
 <jsp:setProperty name="myBean" property="*" param="<%rs%>"/>
 <%
 myBean.setTable(rs);
 out.println(myBean.getTable());
 %>
 <%
 else
 Statement stat = con.createStatement();
 rowsChanged = stat.executeUpdate(sql);
 out.println("<h3>Number of rows affected are: "+rowsChanged+"</h3>");
 }//End of Try
 catch(Exception e)
 System.out.println(e+ "gd"+ e.getMessage());
 %>
 
 
 <a href="check.jsp">Please Click Here to Return to Main Page</a>
 
</body>
</html>Above is my JSP file, which is calling a Java bean class called Table. The thing is that Its not returning any Table from the Table Class. I dont know how to use Java bean as I m new to it. Following is my Table Class. So If anyone can plz help me then it would be great. I m suffering from 2 days just because of this class and JSP.
package mypackage1;
import java.io.Serializable;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
public class Table implements Serializable
private ResultSet rs;
public Table()
public void setTable(ResultSet result)
 rs = result;
public String getTable()
 String output=null;
 try
 ResultSetMetaData metadata;
 metadata=rs.getMetaData();
 // find the number of fields in customer table
 int col=metadata.getColumnCount();
 output = "<table/><tr/>";
 for(int i=1;i<=col;i++)
 output+="<td/>"+metadata.getColumnName(i)+"</td/>";
 output += "</tr/>";
 while (rs.next())
 output="<tr/>";
 for(int i=1;i<=col;i++)
 output+="<td/>"+rs.getString(i)+"</td/>";
 output += "</tr/></table/>";
 }//End of While
 catch(Exception e)
 return output;
}//End of Table method
}//End of Class

First reaction: yuck.
This is not something you should be using a bean for.
Beans are meant for storing data, not for generating HTML from.
I don't really like queries on a JSP page either, but thats a different story again.
I would recommend you use JSTL for this.
1 - it provides a c:forEach tag for looping
2 - it provides sql tags for doing queries in a database
IF you are going to do database queries from a JSP page, I absolutely recommend you use the JSTL tags.
(end rant)
Your problem is probably caused by the fact that in your bean you have the following
try{
// code here
catch (Exception e){
// completely ignore exception and carry on as if nothing bad happened.
// what you should be doing is something like:
System.out.println("Error occurred " + e.getMessage());
e.printStackTrace();
return e.getMessage();
}Cheers,
evnafets

Accessing Java Classes from Forms

Is is possible to access a Java class from Forms? I have been
creating an Active X control that returns a Java object, and from
that I can call methods on that object, but I would really like
to do that without having and Active X control in the mix. Any
suggestions?
null

Oracle Developer Team wrote:
: Robert Nocera (guest) wrote:
: : Oracle Developer Team wrote:
: : : hey robert -
: : : Developer 6.0 provides this ability for web deployment.
You
: : can
: : : insert your own custom Java components into your
application
: : and
: : : they will appear in the application when it is run via the
: web.
: : : If you look at the documentation for 6.0, there are a few
: : : section son Pluggable Java Components and JavaBeans that
: : : describes what is provided and how you use the interfaces
: and
: : : classes we provide.
: : : A whitepaper on this topic will be posted to the OTN
: shortly,
: : as
: : : well as some samples that illustrate how to go about doing
: it.
: : : cheers!
: : : -Oracle Developer Team-
: : Thanks for the quick response. Is there any way to access
: those
: : classes without being in a web deployment. That's probably
: not
: : totally out of the question, but what we had in mind was
: adding
: : some Java Functionality (actually connectictivity to some
EJBs
: : that we have) to existing forms. Currently there forms are
: not
: : deployed in a "web" environment and are just run from the
: forms
: : runtime engine.
: : -Rob
: hey again robert -
: there's no easy way (yet!) to call out from forms runtime
: process to a Java application.
: We've played around some with creating an ORA_FFI interface to
: JNI and then wrappering this with PL/SQL code. We've been able
: to make calling into an EJB running in 8i from a forms runtime
: work using this approach.
: Let me know if this is of interest to you and I can post the
: stuff we've currently got. It's no more than a simple demo and
: is not complete. It requires quite a bit of manual coding on
: the PL/SQL side since the interface emulates JNI (FindClass,
: GetMethodID, CallMethodID, etc.).
: cheers!
: -the Oracle Developer Team-
I'd be interested in this ORA_FFI doc you've been playing with.
Would you please email it to me or post it.
null

How to access java bean in a script

I have a java bean that has session scope . I would like to change attribute of this bean. When a user click�s a link I have to change attribute of this bean. I would like to implement using html:link like this .
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You cannot do it in the javascript. your javabean is in server memory and can be accessed on server side. Can't you do it in the action that handles viewresults.do request?

WPC: Access Java beans from XSL

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