JSP (Java Server Page) - No puedo conectarme una bd

me conecto a una bd de la siguiente manera:

<%!
public class Conexion {
public Connection conexion() {
String url = "jdbc:postgresql://localhost:5432/dental";
String login = "alvaro";
String pass = "";
Connection connec = null;
try {
//Cargo el driver
Class.forName("org.postgresql.Driver");
}catch(java.lang.ClassNotFoundException e) {
System.err.print("ClassNotFoundException: ");
System.err.println(e.getMessage());
}
try {
//Establezco la conexión
connec = DriverManager.getConnection(url, login, pass);
return connec;
}catch(SQLException ex) {
System.err.println("SQLException: " + ex.getMessage());
System.out.println("No conectado");
return connec;
}
}
}
%>
<% Conexion conex = new Conexion();
Connection miConnec = conex.conexion();
if (!miConnec.isClosed()) {
out.print("FUNCIONA !");
miConnec.close();
}else{
out.print("NO FUNCIONA !");
}
%>
Pero me sale este error:

type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:384)
org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:297)
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:247)
javax.servlet.http.HttpServlet.service(HttpServlet .java:860)
sun.reflect.GeneratedMethodAccessor71.invoke(Unkno wn Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:324)
org.apache.catalina.security.SecurityUtil$1.run(Se curityUtil.java:249)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAsPrivileged(Subject .java:500)
org.apache.catalina.security.SecurityUtil.execute( SecurityUtil.java:282)
org.apache.catalina.security.SecurityUtil.doAsPriv ilege(SecurityUtil.java:165)

root cause
java.lang.NullPointerException
org.apache.jsp.control_jsp._jspService(control_jsp .java:96)
org.apache.jasper.runtime.HttpJspBase.service(Http JspBase.java:105)
javax.servlet.http.HttpServlet.service(HttpServlet .java:860)
org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:336)
org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:297)
org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:247)
javax.servlet.http.HttpServlet.service(HttpServlet .java:860)
sun.reflect.GeneratedMethodAccessor71.invoke(Unkno wn Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:324)
org.apache.catalina.security.SecurityUtil$1.run(Se curityUtil.java:249)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAsPrivileged(Subject .java:500)
org.apache.catalina.security.SecurityUtil.execute( SecurityUtil.java:282)
org.apache.catalina.security.SecurityUtil.doAsPriv ilege(SecurityUtil.java:165)
note The full stack trace of the root cause is available in the Sun-Java-System/Application-Server logs.

la conexion funciona cuando lo hago mediante el shell de windows, pero en jsp no.