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Base de datos con Webservice RestFul

Estoy tratando de hacer un webservice con jersey para conectarme a Postgres y emepezar a buscar varios datos en mi base de datos el problema es que cuando hago la busqueda Tomcat se cuelga
Probe la clase antes de y es simple solo busca algo en una tabla este es el webservice

  @GET
    @Path("/ws2/{cedula}")
    @Produces("text/plain")
    public String getFecha(@PathParam("cedula") String ced) {
        //TODO return proper representation object
        //throw new UnsupportedOperationException();
        String sql,s;
        Database db = new Database();
        db.Conectar();
     
        sql = "SELECT to_char(f_vence,'YYYY-MM-DD') from t_clientes WHERE f_cedula='03100802283'";
        s =db.exec_sel_value(sql);
        return sql+" "+ced;
               
    }

Al hacerlo en el log de Tomcat veo esto

INFO: Waiting for 1 instance(s) to be deallocated
abr 01, 2014 2:47:11 PM org.apache.catalina.core.StandardWrapper unload
INFO: Waiting for 1 instance(s) to be deallocated
abr 01, 2014 2:47:11 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [/restful] registered the JDBC driver [org.postgresql.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
abr 01, 2014 2:47:11 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/restful] is still processing a request that has yet to finish. This is very likely to create a memory leak. You can control the time allowed for requests to finish by using the unloadDelay attribute of the standard Context implementation.
abr 01, 2014 2:47:11 PM org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
SEVERE: The web application [/restful] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@1ee607d]) and a value of type [com.sun.jersey.server.impl.application.WebApplicationContext] (value [com.sun.jersey.server.impl.application.WebApplicationContext@100dcab]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
abr 01, 2014 2:47:11 PM org.apache.coyote.AbstractProtocol stop
INFO: Stopping ProtocolHandler ["http-bio-8080"]
abr 01, 2014 2:47:11 PM org.apache.coyote.AbstractProtocol stop
INFO: Stopping ProtocolHandler ["ajp-bio-8009"]

Alguna idea de donde puede estar el error ?

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