Problem Description:
How do you configure jConnect JDBC Connection Pooling
with Apache Tomcat 4.1.x?
Tip or Workaround:
(Observations performed with jConnect-5_2
and Tomcat 4.1.18)
In line, below, are the text of what should be
saved as 3 files:
web.xml
sybase.jsp
server.xml.SybaseDelta
Please proceed as follows:
1) Create the following folders:
1.1) C:\Program Files\Apache Group\Tomcat 4.1\webapps\sybase
1.2) C:\Program Files\Apache Group\Tomcat 4.1\webapps\sybase\jsp
1.3) C:\Program Files\Apache Group\Tomcat 4.1\webapps\sybase\WEB-INF
1.4) C:\Program Files\Apache Group\Tomcat 4.1\webapps\sybase\WEB-INF\jsp
2) Move the file "web.xml" to folder
C:\Program Files\Apache Group\Tomcat 4.1\webapps\sybase\WEB-INF
3) Move the file "sybase.jsp" to folder
C:\Program Files\Apache Group\Tomcat 4.1\webapps\sybase\jsp
4) Copy the contents of file "server.xml.SybaseDelta" into your
existing "C:\Program Files\Apache Group\Tomcat 4.1\conf\server.xml"
file.
Insert the new content as an additional context within the
"Tomcat-Standalone" service specification. Insert this after
the last "</context>" entry, but before the "</host>" terminator
in the "Tomcat-Standalone" service grouping.
Replace the following strings with values appropriate
to your installation:
database_hostname
your_dbname
your_userid
your_password
If your dataserver is not "listening" on port 5000,
make the corresponding change for the port, too, in the
connection url.
5) Copy your jConnect\classes\jconn2.jar file into directory
C:\Program Files\Apache Group\Tomcat 4.1\common\lib
6) Shutdown and restart Tomcat.
7) From your web browser, enter the following url:
http://localhost:8080/Sybase
-----------------------------------------------------------
Text of file "web.xml"
----------------------
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<welcome-file-list>
<welcome-file> /jsp/sybase.jsp </welcome-file>
</welcome-file-list>
<!-- for using dscp -->
<resource-ref>
<res-ref-name> jdbc/a_sybase_datasource </res-ref-name>
<res-type> javax.sql.DataSource </res-type>
<res-auth> Container </res-auth>
</resource-ref>
</web-app>
END_OF_TEXT(web.xml)
Text of file "sybase.jsp"
-------------------------
<%@ page import="java.sql.*" %>
<%@ page import="javax.sql.*" %>
<%@ page import="javax.naming.*" %>
<%@ page import="java.util.*" %>
<html>
<head> <title> Testing Sybase DataSource </title> </head>
<body bgcolor="white">
<font size=4>
<h3> Start of Test </h3>
<%
String s = "java:comp/env";
String t = "jdbc/a_sybase_datasource";
InitialContext initCtx = null;
try
{
initCtx = new InitialContext();
out.println("<p>initCtx = new InitialContext() : successful");
out.println("<BR>");
out.println( initCtx );
}
catch (Exception e)
{
out.println("<p>initCtx = new InitialContext() : failed");
out.println("<BR>");
out.println ( e );
}
Context envCtx = null;
try
{
envCtx = (Context) initCtx.lookup( s );
out.println("<BR>envCtx = initCtx.lookup(" + s + ") : successful");
out.println("<BR>");
out.println( envCtx );
}
catch (Exception e)
{
out.println("<BR>envCtx = initCtx.lookup(" + s + ") : failed");
out.println ( e );
}
DataSource ds = null;
ds = null;
try
{
out.println("<p>Trying ds=(DataSource)envCtx.lookup(" + t + ")");
ds = (DataSource) envCtx.lookup( t );
out.println("<BR>DataSource lookup apparently successful");
out.println("<BR>" + ds );
}
catch (Exception e)
{
out.println("<BR>Datasource lookup failed <BR>");
out.print( e );
}
if (ds == (DataSource) null)
{
out.println("<BR>DataSource null\n");
}
try {
Connection conn = ds.getConnection();
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select db_name()");
while (rs.next())
{
out.println
( "<BR>Inside fetch loop:" );
out.println
( "<BR>Value Returned from DataSource: " +
rs.getString(1) );
} // end_while
rs.close();
stmt.close();
conn.close();
} // end_try
catch (SQLException sqe) {
out.println("<BR>Inside catch(SQLException sqe)");
out.println( sqe.getMessage() );
} // end catch SQLException
catch (Exception e) {
out.println("<BR>Inside catch(Exception e)<BR>");
out.println(e.getMessage());
out.print( e );
} // end catch Exception
%>
<p>
<h3> End of Test </h3>
</font>
</body>
</html>
END_OF_TEXT(sybase.jsp)
Text of file "server.xml.SybaseDelta"
-------------------------------------
<!-- Sybase Example Context - dscp example -->
<Context path="/Sybase"
docBase="sybase"
debug="5"
reloadable="true"
crossContext="true">
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="localhost_Sybase.log."
suffix=".txt"
timestamp="true"/>
<Resource name="jdbc/a_sybase_datasource"
auth="Container"
type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/a_sybase_datasource">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter>
<name>maxActive</name>
<value>10</value>
</parameter>
<parameter>
<name>maxIdle</name>
<value>5</value>
</parameter>
<parameter>
<name>maxWait</name>
<value>10000</value>
</parameter>
<parameter>
<name>driverClassName</name>
<value>com.sybase.jdbc2.jdbc.SybDriver</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:sybase:Tds:database_hostname:5000/your_dbname</value>
</parameter>
<parameter>
<name>username</name>
<value>your_userid</value>
</parameter>
<parameter>
<name>password</name>
<value>your_password</value>
</parameter>
</ResourceParams>
</Context>
<!-- END Sybase Example Context - dscp example -->
END_OF_TEXT(server.xmlSybaseDelta)
Resolution:
j"Tips and Workarounds", above, describes an example Sybase datasource definition, complete with a test jsp.
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