Does somebody knows why this code doesn't work? I want to acces a MS =
Access DB and give a simple query. I give the ResultSet back to my JSP =
file but he gives some errors. JSP and Java-bean are included. Errors =
also. There is data in the db and the odbc-jdbc driver is installed.
Thank you very much in advance
Jonas
import java.sql.*;
import java.util.*;
public class databank {
private String driver =3D "sun.jdbc.odbc.Jdbc.OdbcDriver";
private String url =3D "jdbc:odbc:db1";
private Connection connection;
private Statement statement;
private ResultSet res;
private ResultSetMetaData meta;
private String naam;
private int aantal;
public databank(){}
=20
=20
public ResultSet lijst(){
try {
String query =3D "select * from klant";
Class.forName(driver);
connection =3D DriverManager.getConnection(url); =20
statement =3D connection.createStatement();
res =3D statement.executeQuery(query); =20
=20
}
catch (SQLException e){}
catch (ClassNotFoundException cnfex){}=20
return res;
}
}
ResultSetMetaData meta =3D res.getMetaData(); int aantal =3D
meta.getColumnCount(); %> while (res.next()){ for (kol =3D 1; kol <=3D
aantal; kol++) %>
Error: 500
Location: /test9.jsp
Internal Servlet Error:
javax.servlet.ServletException
at =
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContext=
Impl.java:386)
at =
_0002ftest_00039_0002ejsptest9_jsp_0._jspService(_0002ftest_00039_0002ejs=
ptest9_jsp_0.java:126)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at =
org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet=
.java:174)
at =
org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261)
at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:369)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at =
org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:5=
03)
at =
org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
at =
org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnect=
ion(Ajp12ConnectionHandler.java:156)
at =
org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:=
338)
at java.lang.Thread.run(Thread.java:484)
Root cause:=20
java.lang.NullPointerException
at =
_0002ftest_00039_0002ejsptest9_jsp_0._jspService(_0002ftest_00039_0002ejs=
ptest9_jsp_0.java:93)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at =
org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet=
.java:174)
at =
org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261)
at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:369)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at =
org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:5=
03)
at =
org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
at =
org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnect=
ion(Ajp12ConnectionHandler.java:156)
at =
org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:=
338)
at java.lang.Thread.run(Thread.java:484)
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