this is the error: I think it doesnt find the postgres driver.

------------------------------------------------------------

Error: 500

Localización: /e2.jsp

javax.servlet.ServletException: org.postgresql.Driverat org.apache.jasper.runtime.PageContextImpl.handlePageException(Unknown Source)at e2_1._jspService(e2_1.java:121)at org.apache.jasper.runtime.HttpJspBase.service(Unknown Source)at javax.servlet.http.HttpServlet.service(HttpServlet.java)at org.apache.tomcat.facade.ServletHandler.doService(Unknown Source)at org.apache.tomcat.core.Handler.invoke(Unknown Source)at org.apache.tomcat.core.Handler.service(Unknown Source)at org.apache.tomcat.facade.ServletHandler.service(Unknown Source)at org.apache.tomcat.core.ContextManager.internalService(Unknown Source)at org.apache.tomcat.core.ContextManager.service(Unknown Source)at org.apache.tomcat.modules.server.Ajp12Interceptor.processConnection(Unknown Source)at org.apache.tomcat.util.net.TcpWorkerThread.runIt(Unknown Source)at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(Unknown Source)at java.lang.Thread.run(Thread.java:475)
Causa Raíz:
java.lang.ClassNotFoundException: org.postgresql.Driverat org.apache.tomcat.util.depend.DependClassLoader.loadClassInternal1(Unknown Source)at org.apache.tomcat.util.depend.DependClassLoader12$1.run(Unknown Source)at java.security.AccessController.doPrivileged(Native Method)at org.apache.tomcat.util.depend.DependClassLoader12.loadClass(Unknown Source)at java.lang.ClassLoader.loadClass(ClassLoader.java:243)at java.lang.Class.forName0(Native Method)at java.lang.Class.forName(Class.java:120)at e2_1._jspService(e2_1.java:67)at org.apache.jasper.runtime.HttpJspBase.service(Unknown Source)at javax.servlet.http.HttpServlet.service(HttpServlet.java)at org.apache.tomcat.facade.ServletHandler.doService(Unknown Source)at org.apache.tomcat.core.Handler.invoke(Unknown Source)at org.apache.tomcat.core.Handler.service(Unknown Source)at org.apache.tomcat.facade.ServletHandler.service(Unknown Source)at org.apache.tomcat.core.ContextManager.internalService(Unknown Source)at org.apache.tomcat.core.ContextManager.service(Unknown Source)at org.apache.tomcat.modules.server.Ajp12Interceptor.processConnection(Unknown Source)at org.apache.tomcat.util.net.TcpWorkerThread.runIt(Unknown Source)at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(Unknown Source)at java.lang.Thread.run(Thread.java:475)