Recursive eval in jsp/java ?

hi - i have a simple jsp that uses a bean to go to the database and grab content to be displayed on the webpage. the problem is that the content in the database itself has some java scriplets in it which are not evaluated since the jsp was already been translated. is there a way to do this...we cant remove scripltes from the content..is this possible using taglib ??
thanks,
one4all

Hi,
Yes it is possible using a taglib.It's been a while since I did this, but I think if you extend BodyTagSupport , implement doStartTag() however you like and return EVAL_BODY_INCLUDE (defined somewhere up the BodyTagSupport heirarchy) then the body of the processed tag will be evaluated again.
Regards,
Lance

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Recursive calls by JSP tag files fail to compile

We're hitting an issue with recursive calls in JSP tag files. I found one unanswered post in the General forum - [Tag Files used recursivily throws exception|https://forums.oracle.com/forums/thread.jspa?threadID=853300] - and was wondering if anyone else has hit this or knows of any work-arounds/patches or knows how to raise suspected bugs with Oracle (when you don't have an official support relationship for WebLogic)?
Example tag file - /WEB-INF/tags/recurse/hello.tag:
<%@ tag body-content="empty" %>
<%@ attribute name="name" required="true" type="java.lang.String"%>
<%@ attribute name="depth" required="true" type="java.lang.Number"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="r" uri="/WEB-INF/tags/recurse/recurse.tld" %>
<table border="1" cellpadding="3" cellspacing="3">
<tr>
<td>
Hello ${name} [${depth}]
</td>
<c:if test="${depth > 1}">
<td>
<r:hello name="${name}" depth="${depth-1}"/>
</td>
</c:if>
</tr>
</table>
Example tld file - /WEB-INF/tags/recurse/recurse.tld:
<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd"
version="2.1">
<description>Library with Recursive tag</description>
<tlib-version>1.0</tlib-version>
<shortname>r</shortname>
<tag-file>
<name>hello</name>
<path>/WEB-INF/tags/recurse/hello.tag</path>
</tag-file>
</taglib>
Example jsp file - /recurse/test.jsp:
<%@ page language="java" pageEncoding="UTF-8" contentType="text/html; charset=utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="r" uri="/WEB-INF/tags/recurse/recurse.tld" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Recursive Tag-file Test</title>
</head>
<body>
<c:set var="name" value="${pageContext.request.remoteUser}"/>
<c:set var="depth" value="${5}"/>
<p>Welcome ${name}, here are ${depth} greetings</p>
<r:hello name="${name}" depth="${depth}"/>
</body>
</html>
The expected result from this example would be to get nested 5 HTML tables.
The current behaviour, is the following is shown on screen when loading the test.jsp:
Compilation of JSP File '/recurse/test.jsp' failed:
hello.tag:15:6: Current file's JSP version conflicts with current tag "r:hello"'s.
<r:hello name="${name}" depth="${depth-1}"/>
^-----^
hello.tag:15:6: Current file's JSP version conflicts with current tag "r:hello"'s.
<r:hello name="${name}" depth="${depth-1}"/>
^-----^
I believe the "JSP version conflicts with current tag" message is misleading (you also get the same error referring to the tag file's folder via a tagdir reference from the JSP and defining an 'implicit.tld' which declares version="2.1"). If you take the recursive <r:hello .../> call out of hello.tag the JSP and tag file compile and function fine. I tried the work around mentioned in the forum post mentioned above, taking the recursive call out, deploying, then putting the recursive tag call back in and just updating the tag file doesn't seem to work for me.
Using "weblogic.appc" you get a few more messages, though the issue is the same - tag file doesn't compile:
test.jsp:15:6: The tag handler class was not found "jsp_servlet._tags._recurse.__hello_tag".
<r:hello name="${name}" depth="${depth}"/>
^-----^
test.jsp:15:14: This attribute is not recognized.
<r:hello name="${name}" depth="${depth}"/>
^--^
test.jsp:15:29: This attribute is not recognized.
<r:hello name="${name}" depth="${depth}"/>
^---^
hello.tag:15:6: The tag handler class was not found "jsp_servlet._tags._recurse.__hello_tag".
<r:hello name="${name}" depth="${depth-1}"/>
^-----^
hello.tag:15:6: Current file's JSP version conflicts with current tag "r:hello"'s.
<r:hello name="${name}" depth="${depth-1}"/>
^-----^
Happy to send this example as an ear/war for anyone that's interested.
At this stage, WebLogic seems to be the only servlet container with this limitation.
This has been tested with WebLogic 10.3.3.0 and 12.1.1.0.
The context for this is that the issue is present in a (larger) enterprise application. The above simple example with recursive tags is what we have isolated as the problem.
Although I/we may not have a support relationship for WebLogic, our clients will, so if the solution is apply an already existing patch that solution would be acceptable.

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I am trying to acees MS Access 2003 db through JSP using Tomcat 5.0.28.The code for accessing the databse is incorporated in the bean.The jsp only calls the particular method of the bean .
Code for Java Bean:
package ActiveViewer;
import java.sql.*;
import java.util.*;
public class CompanyBean
Connection con;
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Statement st;
     public CompanyBean(){}
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     Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println("Here4");
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con.close();
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System.out.println("An SQL Exception has occured :: "+e);
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if(con!=null)
     try
st=con.createStatement();
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catch (SQLException e)
System.out.println("An SQL Exception has occured :: "+e);
     e.printStackTrace();
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System.out.println("An Exception has occured while retrieving :: "+e);
e.printStackTrace();
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System.out.println("Connection to database was lost.");
return rs;
The code for JSP that uses the above bean is:
<%@ page language="java" import="java.sql.*,ActiveViewer.* " contentType="text/html"%>
<jsp:useBean id="conn" scope="session" class="ActiveViewer.CompanyBean" />
<html>
<body>
<% String username=request.getParameter("username");
String password=request.getParameter("password");
System.out.println("username:"+username);
System.out.println("password:"+password);
conn.connect();
ResultSet rs=conn.select(username);
System.out.println("Below select ");
while (rs.next())
String dbusername=rs.getString("username");
     String dbpassword=rs.getString("password");
     if(dbusername.equals(username) && dbpassword.equals (password))
{ %> out.println("OK");
          <% }
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<br>Clickhere to go back to Login Page.
<% }
} %>
</body>
</html>
I get the following error:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
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though the database is not int he same folder as the jsp, the DSN is set correctly to pint to the db location.The jsp does print in stdout file:
Here4 (from connect method above)
Here 1 (from connect method above)
Below Select (from jsp)
This means that the jsp does connect to db but it gives the above error.Also the field name also matches that in the database and data is present in the db too.
All other things like creating package for bean,incorporating the packakage are done.
Can someone please help me with their precious advice?

U're getting this error because there is no field called 'password' in ur database, the field in ur database is named 'cpassword' and not 'password'. So change the statement rs.getString("password"); to rs.getString("cpassword");

Column Not found error while trying to access database through JSP+Java Bea

I am trying to access MS Access 2003 db through JSP using Tomcat 5.0.28.The code for accessing the database is incorporated in the bean.The JSP only calls the particular method of the bean .
Code for Java Bean:
package ActiveViewer;
import java.sql.*;
import java.util.*;
public class CompanyBean
Connection con;
ResultSet rs=null;
Statement st;
public CompanyBean(){}
public void connect()
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println("Here4");
con=DriverManager.getConnection("jdbc:odbc:activeviewer","","");
System.out.println("Here1");
catch (ClassNotFoundException e)
System.out.println("Could not locate driver.");
catch (SQLException e)
System.out.println("An SQL Exception has occured :: "+e);
e.printStackTrace();
catch (Exception e)
System.out.println("An unknown Exception has occured :: "+e);
e.printStackTrace();
public void disconnect()
try
if (con!=null)
con.close();
catch (SQLException e)
System.out.println("An SQL Exception has occured :: "+e);
e.printStackTrace();
public ResultSet select(String username)
if(con!=null)
try
st=con.createStatement();
rs=st.executeQuery("select * from company where username='" + username + "'");
catch (SQLException e)
System.out.println("An SQL Exception has occured :: "+e);
e.printStackTrace();
catch (Exception e)
System.out.println("An Exception has occured while retrieving :: "+e);
e.printStackTrace();
else
System.out.println("Connection to database was lost.");
return rs;
The code for JSP that uses the above bean is:
<%@ page language="java" import="java.sql.*,ActiveViewer.* " contentType="text/html"%>
<jsp:useBean id="conn" scope="session" class="ActiveViewer.CompanyBean" />
<html>
<body>
<% String username=request.getParameter("username");
String password=request.getParameter("password");
System.out.println("username:"+username);
System.out.println("password:"+password);
conn.connect();
ResultSet rs=conn.select(username);
System.out.println("Below select ");
while (rs.next())
String dbusername=rs.getString("username");
String dbpassword=rs.getString("password");
if(dbusername.equals(username) && dbpassword.equals (password))
{ %> out.println("OK");
<% }
else { %>Invalid Username and / or Password.
<br>Clickhere to go back to Login Page.
<% }
} %>
</body>
</html>
I get the following error:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Column not found
though the database is not int he same folder as the jsp, the DSN is set correctly to pint to the db location.The jsp does print in stdout file:
Here4 (from connect method above)
Here 1 (from connect method above)
Below Select (from jsp)
This means that the jsp does connect to db but it gives the above error.Also the field name also matches that in the database and data is present in the db too.
All other things like creating package for bean in WEB-INF/classes,incorporating the packakage are done.
Can someone please help me with their precious advice?

Hi, I too have a problem with an SQL exception, the message is Column not found.
I'm using the sun jdbc odbc driver with access.
the first few lines of the stack trace are
sun.jdbc.odbc.JdbcOdbcResultSet.findColumn(JdbcOdbcResultSet.java:1852)
sun.jdbc.odbc.JdbcOdbcResultSet.getInt(JdbcOdbcResultSet.java:603)
net.homeip.sdaniels.MemberBean.ejbFindByUnamePwd(MemberBean.java:127)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
I am of course sure that the column does infact exist. I can insert into the column no problems. the sql looks like this:
SELECT * FROM Members WHERE uName ='Stewart' AND encPwd='�F2C�3��h�1Y�'
Can any one tell me if there is a common cause to this problem?
Thanks

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