HELP PLEASE: Error executing the example esql.xml on cocoon1.8.2

I have installed:
Red Hat 7.2
Postgresql 7.1.3.
JDK1.3
JDBC: /usr/local/jdbc7.1-1.2.jar
Cocoon1.8.2
Tomcat3.2.3

Now when I try to access my pages I get the following error message :

When executing the example esql.xml of the cocoon 1.8.2 that is in
/samples/sql/.

Cocoon 1.8.2
------------------------------------------------------------------------------------
Error found handling the request.
java.lang.RuntimeException: Error loading driver: org.postgresql.Driver
at
_usr._local._jakarta._build._tomcat._webapps._cocoon._samples._sql._esql.populateDocument(_esql.java:141)
at
org.apache.cocoon.processor.xsp.XSPPage.getDocument(XSPPage.java:97)
at
org.apache.cocoon.processor.xsp.XSPProcessor.process(XSPProcessor.java:527)
at org.apache.cocoon.Engine.handle(Engine.java:384)
at org.apache.cocoon.Cocoon.service(Cocoon.java:183)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
at org.apache.tomcat.core.Handler.service(Handler.java:287)
at
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)
at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)
at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
at java.lang.Thread.run(Thread.java:484)

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Warning: this page has been dynamically generated.
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What he/she would have to make to make work this example?
To add or to modify something in tomcat.properties or cocoon.properties or
pg_hba.conf?

From already thank you for their help.
Iván Andrade M.
Punta Arenas.
Chile.

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