Invalid Cursor State - No current row - javadb

Question

I am very new to Java, and I am trying to complete one simple task of reading data from a table and passing it to form variables. However, I am getting this frustrating exception:
Invalid cursor state - no current row;
I tried everything but still no luck. I looked into Google but I'm not getting an answer that will fix this issue. Hope you guys can help.
public class MainFrame extends javax.swing.JFrame {
Connection con;
Statement stm;
ResultSet rs;
/**
* Creates new form MainFrame
*/
public MainFrame() {
initComponents();
DoConnect();
}
public void DoConnect() {
try{
String host = "jdbc:derby:studentinfo;create=true";
String uname = "sudeep";
String upass = "sunny";
con = DriverManager.getConnection(host, uname, upass);
stm = con.createStatement();
String sql = "SELECT * FROM APP.STUDENTID";
rs = stm.executeQuery(sql);
System.out.println("Query executed");
if(rs.next())
{
// This is where the exception is occurring!!!!!!
String id = rs.getString("STUDENTID");
String first = rs.getString("FIRST_NAME");
String second = rs.getString("SECOND_NAME");
ID.setText(id);
fnam1.setText(first);
lnam.setText(second);
System.out.println(id);
}
}
catch ( SQLException err) {
JOptionPane.showMessageDialog(MainFrame.this, err.getMessage());
System.out.println("ERROR GETCONNECTION");}
}
}
Here is the trace generated by the program
run:
[EL Info]: 2013-09-03 21:14:15.732--ServerSession(552364977)--EclipseLink, version: Eclipse Persistence Services - 2.5.0.v20130507-3faac2b
[EL Info]: connection: 2013-09-03 21:14:16.299--ServerSession(552364977)--file:/Users/vasundhra_sudeep/NetBeansProjects/StudentForm/build/classes/_jdbc:derby:studentinfo;create=truePU login successful
java.sql.SQLException: Invalid cursor state - no current row.
Invalid cursor state - no current row.
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.newSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.ConnectionChild.newSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.checkOnRow(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.getColumnType(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.getString(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedResultSet.getString(Unknown Source)
at studentform.MainFrame.DoConnect(MainFrame.java:57)
at studentform.MainFrame.(MainFrame.java:35)
at studentform.MainFrame$7.run(MainFrame.java:579)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:715)
at java.awt.EventQueue.access$400(EventQueue.java:82)
at java.awt.EventQueue$2.run(EventQueue.java:676)
at java.awt.EventQueue$2.run(EventQueue.java:674)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:685)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.sql.SQLException: Invalid cursor state - no current row.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)
... 27 more
BUILD SUCCESSFUL (total time: 7 seconds)

Answer 1

It's likely that APP.STUDENTID has no data in it. Insert at least one record (aka row) of data into that table, run your program again, and see if the same exception occurs.