HELP!!! Can't use sql:update in Netbeans Visual Web JSP

Question

I use Netbeans Visual Web in my project. I use Java DB database and Sun Java System Application Server 9.
When i run my project, there is an error "The server encountered an internal error () that prevented it from fulfilling this request."
Here is the codes:
<?xml version="1.0" encoding="UTF-8"?>
<jsp:root version="1.2" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:ui="http://www.sun.com/web/ui" xmlns:c="http://java.sun.com/jsp/jstl/core" xmlns:sql="http://java.sun.com/jsp/jstl/sql" >
<jsp:directive.page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"/>
<f:view>
<ui:page binding="#{Page1.page1}" id="page1">
<sql:update var="indata" dataSource="datasource">
INSERT INTO "NBUSER"."user" ("Username") VALUES('jacky')
</sql:update>
<ui:html binding="#{Page1.html1}" id="html1">
<ui:head binding="#{Page1.head1}" id="head1">
<ui:link binding="#{Page1.link1}" id="link1" url="/resources/stylesheet.css"/>
</ui:head>
<ui:body binding="#{Page1.body1}" id="body1" style="-rave-layout: grid">
<ui:form binding="#{Page1.form1}" id="form1"/>
</ui:body>
</ui:html>
</ui:page>
</f:view>
</jsp:root>
I can't store the data "jacky" into "Username" column in "user" table in database. Can anyone please let me know where is my mistake. Thanks.

Answer 1

Maybe that SQL statement isn't valid. All those quotes look weird to me, but don't take that as meaning they are wrong. You should look in your server's logs to find out the actual error that occurred, rather than trying to guess what's wrong.