NullPointer exception in ResultSet.getString()

Hello

I am a new user of postrgresql and am accessing it through java(jsp).

Trying to get a string from a result set I get a really weird
NullPointer exception from the method
org.postgresql.jdbc2.ResultSet.getString inside the jdbc driver.

I am using postgresql 7.2.1 on linux 2.4.18
allong with tomcat 4.0.4
and sun's j2sdk1.4.0
the driver is jdbc2

here is my code that produces the prob

String dsn =
"jdbc:postgresql://localhost:5432/illigos?user=illigos&password=qwerty";
Connection conn = DriverManager.getConnection(dsn);
.
.
.
Statement st = conn.createStatement();

ResultSet rs = st.executeQuery("select * from FOITITIS where
account='"+account+"';");
.
.
.
out.println("<tr><td><i>Onoma:</i></td><td>"+rs.getString("onoma")+"</td></tr>");

this is my table description:

illigos=> \d foititis
Table "foititis"
Column | Type | Modifiers
------------+-----------------------+-----------
account | character varying(20) | not null
onoma | character varying(40) |
epitheto | character varying(40) |
ar_mitroou | character varying(10) |
examino | character varying(20) |
Primary key: foititis_pkey
Triggers: RI_ConstraintTrigger_16590,
RI_ConstraintTrigger_16592

follows the exception report:

java.lang.NullPointerException
at org.postgresql.jdbc2.ResultSet.getString(ResultSet.java:168)
at org.postgresql.jdbc2.ResultSet.getString(ResultSet.java:553)
at org.apache.jsp.use$jsp._jspService(use$jsp.java:116)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:201)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:381)
at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:473)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at
org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)
at
org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)
at java.lang.Thread.run(Thread.java:536)

Thanks in advance
Gaganis Giorgos