JAVA - SQLException throws exist column not found - eclipse

Question

First of all, sorry for my bad english.
When i'm running this method it throws an exception and it says an exist column does not exist, take a look at the method:
public Reprobacion obtenerReprobacion(int id){
Reprobacion miRep = new Reprobacion();
try{
sql = "SELECT * FROM reprobacion WHERE idReprobacion = ?";
st = conexion.prepareStatement(sql);
st.setInt(1, id);
rs = st.executeQuery();
rs.beforeFirst();
rs.next();
miRep.setIdReprobacion(rs.getInt("IdReprobacion"));
miRep.setIdCiclo(rs.getInt("IdCiclo"));
miRep.setCiclo(obtenerCiclo(miRep.getIdCiclo()).getCiclo());
miRep.setMateria(rs.getString("Materia"));
miRep.setNota(rs.getFloat("Nota"));
miRep.setDetalle(rs.getString("Detalle"));
}catch(SQLException ex){
ex.printStackTrace();
}
return miRep;
}
it throws:
java.sql.SQLException: Column 'Materia' not found.
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:910)
at com.mysql.jdbc.ResultSet.findColumn(ResultSet.java:955)
at com.mysql.jdbc.ResultSet.getString(ResultSet.java:5447)
at org.apache.tomcat.dbcp.dbcp.DelegatingResultSet.getString(DelegatingResultSet.java:263)
at org.apache.tomcat.dbcp.dbcp.DelegatingResultSet.getString(DelegatingResultSet.java:263)
at org.ccgk.www.model.ReprobacionesModel.obtenerReprobacion(ReprobacionesModel.java:67)
at org.ccgk.www.controller.ReprobacionesController.obtener(ReprobacionesController.java:186)
at org.ccgk.www.controller.ReprobacionesController.processRequest(ReprobacionesController.java:52)
at org.ccgk.www.controller.ReprobacionesController.doGet(ReprobacionesController.java:209)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
after suffer for a few hours i found how to get the names of the columns, so i added the followin lines:
ResultSetMetaData rsmd = rs.getMetaData();
System.out.println("columnas: "+rsmd.getColumnCount());
System.out.println(rsmd.getColumnName(1));
System.out.println(rsmd.getColumnName(2));
System.out.println(rsmd.getColumnName(3));
System.out.println(rsmd.getColumnName(4));
System.out.println(rsmd.getColumnName(5));
And after running i got this on the console:
columnas: 5
IdReprobacion
IdCiclo
Materia
Nota
Detalle
So the column named "Materia" actually exist and i do not know why is it trowing the "column not found exception" if someone could help me i'll be thankfull.