Tomcat and JNDI

2003-01-13 Thread Randy Paries
Hello,

I am trying to get tomcat and jndi working. 

I am just looking for some direction in troubleshooting. I have
configured the server.xml and web.xml as given in the examples of the
tomcat docs for oracle.

In the code I am trying to get working.
//snippet//
initNamingContext= new InitialContext ();
envNamingContext= (Context) initNamingContext.lookup
("java:comp/env");
envNamingContext.bind (JNDINames.userDataDtdJndiName,
userDataDTDName);

When it does the envNamingContext.bind it throws and exception (see
below)
Any help would be greatly appreciated
Thanks
Randy Paries

javax.naming.NamingException: Context is read only
at
org.apache.naming.NamingContext.checkWritable(NamingContext.java:942)
at org.apache.naming.NamingContext.bind(NamingContext.java:870)
at org.apache.naming.NamingContext.bind(NamingContext.java:212)
at org.apache.naming.NamingContext.bind(NamingContext.java:228)
at
com.mc.pc.struts.plugins.PrintCenterPlugin.init(PrintCenterPlugin.java:1
10)
at
org.apache.struts.action.ActionServlet.initApplicationPlugIns(ActionServ
let.java:991)
at
org.apache.struts.action.ActionServlet.init(ActionServlet.java:471)
at com.mc.action.MCActionServlet.init(MCActionServlet.java:22)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.jav
a:918)
at
org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:810)
at
org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.j
ava:3279)
at
org.apache.catalina.core.StandardContext.start(StandardContext.java:3421
)
at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
at
org.apache.catalina.core.StandardHost.start(StandardHost.java:638)
at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
at
org.apache.catalina.core.StandardEngine.start(StandardEngine.java:343)
at
org.apache.catalina.core.StandardService.start(StandardService.java:388)
at
org.apache.catalina.core.StandardServer.start(StandardServer.java:506)
at org.apache.catalina.startup.Catalina.start(Catalina.java:781)
at
org.apache.catalina.startup.Catalina.execute(Catalina.java:681)
at
org.apache.catalina.startup.Catalina.process(Catalina.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:243)
DEBUG [01-13-03 12:56:28,750]
mc.servlets.MCContextListener.contextInitialized():28 : ServletContext
Listener was Called
P:\webapp\



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Tomcat and JNDI - Basic Question

2003-06-06 Thread Renato Romano
In the tomcat documentation it is said that to configure a new JNDI
resource you shoul put a Resource entry in the Context portion of my
app, and a following ResourceParams, indicating the java class name of
the factory (the class that must implement ObjectFactory). This seems
quite correct: in order to build an object, I need a Factory!! But I
noticed it works fine even if the ResourceParams is not present ?? The
conclusion is: I'm surely missing something !! How can Tomcat know how
to build my object if I don't give the name of the factory class ???







Any Help Appreciated!!
Renato


Renato Romano
Sistemi e Telematica S.p.A.
Calata Grazie - Vial Al Molo Giano
16127 - GENOVA

e-mail: [EMAIL PROTECTED]
Tel.:   010 2712603
_




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Tomcat and JNDI - Basic Question

2003-06-10 Thread Renato Romano
In the tomcat documentation it is said that to configure a new JNDI
resource you should put a Resource entry in the Context portion of my
app, and a following ResourceParams, indicating the java class name of
the factory (the class that must implement ObjectFactory). This seems
quite correct: in order to build an object, I need a Factory!! But I
noticed it works fine even if the ResourceParams is not present ?? The
conclusion is: I'm surely missing something !! How can Tomcat know how
to build my object if I don't give the name of the factory class ???







Any Help Appreciated!!
Renato


Renato Romano
Sistemi e Telematica S.p.A.
Calata Grazie - Vial Al Molo Giano
16127 - GENOVA

e-mail: [EMAIL PROTECTED]
Tel.:   010 2712603
_




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Apache, Tomcat and JNDI problem...

2001-10-23 Thread JTurner

Hi,

I have been developing an application that does a JNDI lookup for a
DataSource and then does a database query. Everything works great when I
just use Tomcat 4.0.1. But when I use Apache as the front end and use the
Warp Connector to connect Apache and Tomcat, I am then unable to retrieve
the DataSource from the JNDI tree.

I receive the exception: javax.naming.NameNotFoundException: Name testDB is
not bound in this Context

I did some digging and found that there is the same problem with the Tomcat
example: /examples/servlet/JndiServlet

This is what I receive when running the example using only Tomcat on port
8080:
(http://localhost:8080/examples/servlet/JndiServlet)

Simple lookup test :
Max exemptions value : 15
list() on /comp/env Context :
Binding : mail: org.apache.naming.NamingContext
Binding : maxExemptions: java.lang.Integer
Binding : minExemptions: java.lang.Integer
Binding : jdbc: org.apache.naming.NamingContext
Binding : ejb: org.apache.naming.NamingContext
Binding : name3: java.lang.Integer
Binding : foo: org.apache.naming.NamingContext
listBindings() on /comp/env Context :
Binding : mail:
org.apache.naming.NamingContext:org.apache.naming.NamingContext@7a1bb6
Binding : maxExemptions: java.lang.Integer:15
Binding : minExemptions: java.lang.Integer:1
Binding : jdbc:
org.apache.naming.NamingContext:org.apache.naming.NamingContext@315d34
Binding : ejb:
org.apache.naming.NamingContext:org.apache.naming.NamingContext@5e256f
Binding : name3: java.lang.Integer:1
Binding : foo:
org.apache.naming.NamingContext:org.apache.naming.NamingContext@6bd8ea


But when I connect Apache and Tomcat using the Warp Connector I receive:
(http://localhost/examples/servlet/JndiServlet)

JNDI lookup failed : javax.naming.NameNotFoundException: Name maxExemptions
is not bound in this Context
list() on /comp/env Context :
Binding : mail: org.apache.naming.NamingContext
Binding : minExemptions: java.lang.Integer
Binding : ejb: org.apache.naming.NamingContext
Binding : name3: java.lang.Integer
Binding : foo: org.apache.naming.NamingContext
listBindings() on /comp/env Context :
Binding : mail:
org.apache.naming.NamingContext:org.apache.naming.NamingContext@2da3d
Binding : minExemptions: java.lang.Integer:1
Binding : ejb:
org.apache.naming.NamingContext:org.apache.naming.NamingContext@45f743
Binding : name3: java.lang.Integer:1
Binding : foo:
org.apache.naming.NamingContext:org.apache.naming.NamingContext@6c8909


I have tested this on Apache 1.3.20, Apache 1.3.22, Tomcat 4.0, Tomcat 4.0.1
and Tomcat 4.1-dev (nightly build).

Has anyone come across this problem before, or know how to correct this?

Justin.



Re: Tomcat and JNDI - Basic Question

2003-06-10 Thread Yoav Shapira
Howdy,
It might be that the fallback behavior is to use a public no-args constructor,
ala JavaBeans.

Yoav Shapira

--- Renato Romano <[EMAIL PROTECTED]> wrote:
> In the tomcat documentation it is said that to configure a new JNDI
> resource you should put a Resource entry in the Context portion of my
> app, and a following ResourceParams, indicating the java class name of
> the factory (the class that must implement ObjectFactory). This seems
> quite correct: in order to build an object, I need a Factory!! But I
> noticed it works fine even if the ResourceParams is not present ?? The
> conclusion is: I'm surely missing something !! How can Tomcat know how
> to build my object if I don't give the name of the factory class ???
> 
> 
>   
>   
>   
>   
> 
> Any Help Appreciated!!
> Renato
> 
> 
> Renato Romano
> Sistemi e Telematica S.p.A.
> Calata Grazie - Vial Al Molo Giano
> 16127 - GENOVA
> 
> e-mail: [EMAIL PROTECTED]
> Tel.:   010 2712603
> _
> 
> 
> 
> 
> -
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
> 


=
Yoav Shapira
[EMAIL PROTECTED]

__
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Problem connecting to mysql database with Tomcat and JNDI

2003-08-21 Thread Robert S. Jones
Folks, 

I'm having trouble connecting to a mysql database through Tomcat.  I'm
using Tomcat 5.0.9a with mysql 4.0.14.  I have the mysql 3.0.8 JDBC
driver in ${TOMCAT_HOME}/common/lib.  I'm running RedHat 8.0 with a
stock kernel. 

I've been able to connect to the database without JNDI services.  I
believe I have the database user set up correctly.  I have been all over
the web trying to figure out what the problem is.  It seems like
everyone is having this problem, but no two solutions are the same.

FWIW I've tried a lot of this on Tomcat 4 and have had the same results.

I've traced the problem to the following code from the JSP file below:

conn = ds.getConnection();

Any thoughts/ideas would be greatly appreciated.  I'm at the end of my
rope on this.

Here is the error message I'm getting. 

java.lang.NullPointerException 
org.apache.jsp.usingDataSource_jsp._jspService(usingDataSource_jsp.java:74) 
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:136) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:856) 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:320) 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:293)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:856) 

Here is the JSP page I'm using: 

<[EMAIL PROTECTED] import="java.sql.*, javax.sql.*, javax.naming.*"%>


Using a DataSource


Using a DataSource
<%
DataSource ds = null;
Connection conn = null;
ResultSet result = null;
Statement stmt = null;
ResultSetMetaData rsmd = null;

try {
Context context = new InitialContext();
Context envCtx = (Context) context.lookup("java:comp/env");
ds = (DataSource)envCtx.lookup("jdbc/address");
if (ds != null) {
conn = ds.getConnection();
stmt = conn.createStatement();
result = stmt.executeQuery("SELECT * FROM AddressList");
}
}
catch (SQLException e) {
System.out.println("Error occurred " + e);
}
int columns = 0;
try {
rsmd = result.getMetaData(); // bad line
columns = rsmd.getColumnCount();
}
catch (SQLException e) {
System.out.println("Error occurred " + e);
}
%>


<% // write out the header cells containing the column labels
try {
for (int i = 1; i <= columns; i++) {
out.write("" + rsmd.getColumnLabel(i) + "");
}
%>

<% // now write out one row for each entry in the database table
while (result.next()) {
out.write("");
for (int i = 1; i <= columns; i++) {
out.write("" + result.getString(i) + "");
}
out.write("");
}

// close the connection, resultset, and the statement
result.close();
stmt.close();
conn.close();
} // end of the try block
catch (SQLException e) {
System.out.println("Error " + e);
}
// ensure everything is closed
finally {
try {
if (stmt != null) {
stmt.close();
}
} catch (SQLException e) {}
try {
if (conn != null) {
conn.close();
}
} catch (SQLException e ) {}
}
%>






Here are the changes I made to my server.xml file.  Of course, I've
changed the username/password entries here. 

 
   
 
  username 
  username 
 
 
  password 
  password 
 
 
  url 
  jdbc:mysql://localhost:3306/ADDRESS 
 
 
  driverClassName 
  com.mysql.jdbc.Driver 
 
   
 

Here is the web.xml file I am using in my WEB-INF directory. 

 
http://java.sun.com/dtd/web-app_2_3.dtd";> 
 
   
  jdbc/address 
  javax.sql.DataSource 
  Container 
   
 

Rob





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RE: Problem connecting to mysql database with Tomcat and JNDI

2003-08-22 Thread Scott Stewart
Well, looking at your  definition, I'm not seeing the following
required element:



Thanks,

Scott Stewart
[Manager, Software Development]
[EMAIL PROTECTED]

ClearSky Mobile Media, Inc.
56 E. Pine Street  Suite 200
Orlando, FL  32801
USA





-Original Message-
From: Robert S. Jones [mailto:[EMAIL PROTECTED]
Sent: Thursday, August 21, 2003 5:35 PM
To: [EMAIL PROTECTED]
Subject: Problem connecting to mysql database with Tomcat and JNDI


Folks, 

I'm having trouble connecting to a mysql database through Tomcat.  I'm
using Tomcat 5.0.9a with mysql 4.0.14.  I have the mysql 3.0.8 JDBC
driver in ${TOMCAT_HOME}/common/lib.  I'm running RedHat 8.0 with a
stock kernel. 

I've been able to connect to the database without JNDI services.  I
believe I have the database user set up correctly.  I have been all over
the web trying to figure out what the problem is.  It seems like
everyone is having this problem, but no two solutions are the same.

FWIW I've tried a lot of this on Tomcat 4 and have had the same results.

I've traced the problem to the following code from the JSP file below:

conn = ds.getConnection();

Any thoughts/ideas would be greatly appreciated.  I'm at the end of my
rope on this.

Here is the error message I'm getting. 

java.lang.NullPointerException 
org.apache.jsp.usingDataSource_jsp._jspService(usingDataSource_jsp.java:74) 
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:136) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:856) 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:3
20) 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:293)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:856) 

Here is the JSP page I'm using: 

<[EMAIL PROTECTED] import="java.sql.*, javax.sql.*, javax.naming.*"%>


Using a DataSource


Using a DataSource
<%
DataSource ds = null;
Connection conn = null;
ResultSet result = null;
Statement stmt = null;
ResultSetMetaData rsmd = null;

try {
Context context = new InitialContext();
Context envCtx = (Context) context.lookup("java:comp/env");
ds = (DataSource)envCtx.lookup("jdbc/address");
if (ds != null) {
conn = ds.getConnection();
stmt = conn.createStatement();
result = stmt.executeQuery("SELECT * FROM AddressList");
}
}
catch (SQLException e) {
System.out.println("Error occurred " + e);
}
int columns = 0;
try {
rsmd = result.getMetaData(); // bad line
columns = rsmd.getColumnCount();
}
catch (SQLException e) {
System.out.println("Error occurred " + e);
}
%>


<% // write out the header cells containing the column labels
try {
for (int i = 1; i <= columns; i++) {
out.write("" + rsmd.getColumnLabel(i) + "");
}
%>

<% // now write out one row for each entry in the database table
while (result.next()) {
out.write("");
for (int i = 1; i <= columns; i++) {
out.write("" + result.getString(i) + "");
}
out.write("");
}

// close the connection, resultset, and the statement
result.close();
stmt.close();
conn.close();
} // end of the try block
catch (SQLException e) {
System.out.println("Error " + e);
}
// ensure everything is closed
finally {
try {
if (stmt != null) {
stmt.close();
}
} catch (SQLException e) {}
try {
if (conn != null) {
conn.close();
}
} catch (SQLException e ) {}
}
%>






Here are the changes I made to my server.xml file.  Of course, I've
changed the username/password entries here. 

 
   
 
  username 
  username 
 
 
  password 
  password 
 
 
  url 
  jdbc:mysql://localhost:3306/ADDRESS 
 
 
  driverClassName 
  com.mysql.jdbc.Driver 
 
   
 

Here is the web.xml file I am using in my WEB-INF directory. 

 
http://java.sun.com/dtd/web-app_2_3.dtd";> 
 
   
  jdbc/address 
  javax.sql.DataSource 
  Container 
   
 

Rob





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RE: Problem connecting to mysql database with Tomcat and JNDI

2003-08-22 Thread Robert S. Jones
Ok, I tried that.  Same results.  Here is my new  definition.


  
  

  username
  username


  password
  password


  url
  jdbc:mysql://localhost:3306/ADDRESS


  driverClassName
  com.mysql.jdbc.Driver

  


Thanks,
Rob


On Fri, 2003-08-22 at 07:09, Scott Stewart wrote:
> Well, looking at your  definition, I'm not seeing the following
> required element:
> 
>auth="Container" 
>   type="javax.sql.DataSource" />
> 
> Thanks,
> 
> Scott Stewart
> [Manager, Software Development]
> [EMAIL PROTECTED]
> 
> ClearSky Mobile Media, Inc.
> 56 E. Pine Street  Suite 200
> Orlando, FL  32801
> USA
> 
> 
> 
> 
> 
> -Original Message-
> From: Robert S. Jones [mailto:[EMAIL PROTECTED]
> Sent: Thursday, August 21, 2003 5:35 PM
> To: [EMAIL PROTECTED]
> Subject: Problem connecting to mysql database with Tomcat and JNDI
> 
> 
> Folks, 
> 
> I'm having trouble connecting to a mysql database through Tomcat.  I'm
> using Tomcat 5.0.9a with mysql 4.0.14.  I have the mysql 3.0.8 JDBC
> driver in ${TOMCAT_HOME}/common/lib.  I'm running RedHat 8.0 with a
> stock kernel. 
> 
> I've been able to connect to the database without JNDI services.  I
> believe I have the database user set up correctly.  I have been all over
> the web trying to figure out what the problem is.  It seems like
> everyone is having this problem, but no two solutions are the same.
> 
> FWIW I've tried a lot of this on Tomcat 4 and have had the same results.
> 
> I've traced the problem to the following code from the JSP file below:
> 
> conn = ds.getConnection();
> 
> Any thoughts/ideas would be greatly appreciated.  I'm at the end of my
> rope on this.
> 
> Here is the error message I'm getting. 
> 
> java.lang.NullPointerException 
> org.apache.jsp.usingDataSource_jsp._jspService(usingDataSource_jsp.java:74) 
> org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:136) 
> javax.servlet.http.HttpServlet.service(HttpServlet.java:856) 
> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:3
> 20) 
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:293)
> org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240) 
> javax.servlet.http.HttpServlet.service(HttpServlet.java:856) 
> 
> Here is the JSP page I'm using: 
> 
> <[EMAIL PROTECTED] import="java.sql.*, javax.sql.*, javax.naming.*"%>
> 
> 
> Using a DataSource
> 
> 
> Using a DataSource
> <%
> DataSource ds = null;
> Connection conn = null;
> ResultSet result = null;
> Statement stmt = null;
> ResultSetMetaData rsmd = null;
> 
> try {
> Context context = new InitialContext();
> Context envCtx = (Context) context.lookup("java:comp/env");
> ds = (DataSource)envCtx.lookup("jdbc/address");
> if (ds != null) {
> conn = ds.getConnection();
> stmt = conn.createStatement();
> result = stmt.executeQuery("SELECT * FROM AddressList");
> }
> }
> catch (SQLException e) {
> System.out.println("Error occurred " + e);
> }
> int columns = 0;
> try {
> rsmd = result.getMetaData(); // bad line
> columns = rsmd.getColumnCount();
> }
> catch (SQLException e) {
> System.out.println("Error occurred " + e);
> }
> %>
> 
> 
> <% // write out the header cells containing the column labels
> try {
> for (int i = 1; i <= columns; i++) {
> out.write("" + rsmd.getColumnLabel(i) + "");
> }
> %>
> 
> <% // now write out one row for each entry in the database table
> while (result.next()) {
> out.write("");
> for (int i = 1; i <= columns; i++) {
> out.write("" + result.getString(i) + "");
> }
> out.write("");
> }
> 
> // close the connection, resultset, and the statement
> result.close();
> stmt.close();
> conn.close();
> } // end of the try block
> catch (SQLException e) {
> System.out.println("Error " + e);
> }
> // ensure everything is closed
> finally {
> try {
> if (stmt != null) {
> stmt.close();
> }
> } catch (SQLException e) {}
> try {
> if (conn != null) {
> conn.close();
> }
> } catch (SQLException e ) {}
> }
> %>
> 
> 
> 
> 
> 
&

RE: Problem connecting to mysql database with Tomcat and JNDI

2003-08-22 Thread Robert S. Jones
Well Folks, the law of, "the longer a problem takes to resolve, the
dumber the mistake" has held true once again.  It turns out that I had
my  definition in the wrong place in the server.xml file.  I'm
aggravated, but glad to have the problem solved.

Thanks Scott for your suggestions.  I should have posted the whole
server.xml file.  That probably would have made the problem obvious to
folks more experienced than me.

Rob

On Fri, 2003-08-22 at 09:00, Robert S. Jones wrote:
> Ok, I tried that.  Same results.  Here is my new  definition.
> 
> 
>type="javax.sql.DataSource"/>
>   
> 
>   username
>   username
> 
> 
>   password
>   password
> 
> 
>   url
>   jdbc:mysql://localhost:3306/ADDRESS
> 
> 
>   driverClassName
>   com.mysql.jdbc.Driver
> 
>   
> 
> 
> Thanks,
> Rob
> 
> 
> On Fri, 2003-08-22 at 07:09, Scott Stewart wrote:
> > Well, looking at your  definition, I'm not seeing the following
> > required element:
> > 
> >  >   auth="Container" 
> >   type="javax.sql.DataSource" />
> > 
> > Thanks,
> > 
> > Scott Stewart
> > [Manager, Software Development]
> > [EMAIL PROTECTED]
> > 
> > ClearSky Mobile Media, Inc.
> > 56 E. Pine Street  Suite 200
> > Orlando, FL  32801
> > USA
> > 
> > 
> > 
> > 
> > 
> > -Original Message-
> > From: Robert S. Jones [mailto:[EMAIL PROTECTED]
> > Sent: Thursday, August 21, 2003 5:35 PM
> > To: [EMAIL PROTECTED]
> > Subject: Problem connecting to mysql database with Tomcat and JNDI
> > 
> > 
> > Folks, 
> > 
> > I'm having trouble connecting to a mysql database through Tomcat.  I'm
> > using Tomcat 5.0.9a with mysql 4.0.14.  I have the mysql 3.0.8 JDBC
> > driver in ${TOMCAT_HOME}/common/lib.  I'm running RedHat 8.0 with a
> > stock kernel. 
> > 
> > I've been able to connect to the database without JNDI services.  I
> > believe I have the database user set up correctly.  I have been all over
> > the web trying to figure out what the problem is.  It seems like
> > everyone is having this problem, but no two solutions are the same.
> > 
> > FWIW I've tried a lot of this on Tomcat 4 and have had the same results.
> > 
> > I've traced the problem to the following code from the JSP file below:
> > 
> > conn = ds.getConnection();
> > 
> > Any thoughts/ideas would be greatly appreciated.  I'm at the end of my
> > rope on this.
> > 
> > Here is the error message I'm getting. 
> > 
> > java.lang.NullPointerException 
> > org.apache.jsp.usingDataSource_jsp._jspService(usingDataSource_jsp.java:74) 
> > org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:136) 
> > javax.servlet.http.HttpServlet.service(HttpServlet.java:856) 
> > org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:3
> > 20) 
> > org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:293)
> > org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240) 
> > javax.servlet.http.HttpServlet.service(HttpServlet.java:856) 
> > 
> > Here is the JSP page I'm using: 
> > 
> > <[EMAIL PROTECTED] import="java.sql.*, javax.sql.*, javax.naming.*"%>
> > 
> > 
> > Using a DataSource
> > 
> > 
> > Using a DataSource
> > <%
> > DataSource ds = null;
> > Connection conn = null;
> > ResultSet result = null;
> > Statement stmt = null;
> > ResultSetMetaData rsmd = null;
> > 
> > try {
> > Context context = new InitialContext();
> > Context envCtx = (Context) context.lookup("java:comp/env");
> > ds = (DataSource)envCtx.lookup("jdbc/address");
> > if (ds != null) {
> > conn = ds.getConnection();
> > stmt = conn.createStatement();
> > result = stmt.executeQuery("SELECT * FROM AddressList");
> > }
> > }
> > catch (SQLException e) {
> > System.out.println("Error occurred " + e);
> > }
> > int columns = 0;
> > try {
> > rsmd = result.getMetaData(); // bad line
> > columns = rsmd.getColumnCount();
> > }
> > catch (SQLException e) {
> > System.out.println("Error occurred " + e);
> > }
> > %>
> > 
> > 
> > <% // write out the header cells containing the column labels
&g