problem with interceptor

i am using dbForms version dbforms_2.5-SNAPSHOT_20041204

*** my interceptor

/*
* CheckForecastValues.java
*
* Created on 15. Februar 2005, 14:03
*/

package interceptors;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.servlet.http.HttpServletRequest;
import org.apache.log4j.Category;
import org.dbforms.config.DbFormsConfig;
import org.dbforms.config.FieldValue;
import org.dbforms.config.FieldValues;
import org.dbforms.config.Table;
import org.dbforms.config.ValidationException;
import org.dbforms.event.DbEventInterceptorSupport;

/**
*
* @author sro
*/
public class CheckForecastValues extends DbEventInterceptorSupport {
    private Category logCat = Category.getInstance( this.getClass().getName());
   
    public int preUpdate( HttpServletRequest request, Table table, FieldValues fieldValues, DbFormsConfig config, Connection con) throws ValidationException {
       
        Statement stmt;
        ResultSet rs          = null;
       
        FieldValue pNumber = fieldValues.get( "projectNumber");
        double totalHours = 0.0, totalPHours = 0.0;
        double totalInvoice = 0.0, totalPInvoice = 0.0;
       
        if ( pNumber == null) {
            try {
                stmt = con.createStatement();
               
                String strSql = "select sum( fhours) as totalHours, sum( invoice) as totalInvoice from emc.tforecast where projectNumber=" + pNumber.getFieldValue();
                rs = stmt.executeQuery(strSql);
                rs.next();
                totalHours = rs.getDouble( "totalHours");
                totalInvoice = rs.getDouble( "totalInvoice");
               
                strSql = "select distinct ( sum(BudgetedHours) - sum(ActRevHrsFinal)) as totalHours, sum(FundingAmountFinalUSD) as totalInvoice from emc.tproject where projectNumber=" + pNumber.getFieldValue();
                rs = stmt.executeQuery(strSql);
                rs.next();
                totalPHours = rs.getDouble( "totalHours");
                totalPInvoice = rs.getDouble( "totalInvoice");

                stmt.close();
            } catch( SQLException ex) {
                ex.printStackTrace();
            }
           
            if( totalHours < totalPHours) throw new ValidationException( "The total of Hours Still to deliver is larger than Budgeted Hours Final...");
            if( totalInvoice < totalPInvoice) throw new ValidationException( "The total Amount still to invoice is larger than Funding Amount Final (USD)...");
        }
       
        return this.GRANT_OPERATION;
    }
   
}

*** my interceptor

it is located in the WEB-INF\classes\interceptors directory

*** ERROR
WARN-[15.02.2005 16:56:49]-[http-8084-Processor21]-[org.dbforms.servlets.ConfigServlet.initLocaleKey(ConfigServlet.java:242)]- Locale Key not setted, use "org_dbforms_LOCALE" as key to access the Locale in session scope.
ERROR-[15.02.2005 16:57:10]-[http-8084-Processor25]-[org.dbforms.taglib.DbFormTag.doStartTag(DbFormTag.java:1296)]-pos6
ERROR-[15.02.2005 16:57:10]-[http-8084-Processor25]-[org.dbforms.taglib.DbFormTag.doStartTag(DbFormTag.java:1297)]-
java.lang.NullPointerException
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:141)
    at org.dbforms.config.Table.processInterceptors(Table.java:1970)
    at org.dbforms.taglib.DbFormTag.doStartTag(DbFormTag.java:1293)
    at org.apache.jsp.efmmnt.frmProjShow_jsp._jspService(frmProjShow_jsp.java:811)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
    at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
    at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
    at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
    at java.lang.Thread.run(Thread.java:534)

*** ERROR

*** config
    <query name="UPDATE_FORECAST" distinct="false" from="emc.tforecast">
        <field name="oid" fieldType="integer" size="11" isKey="true" autoInc="true"/>
        <field name="projectNumber" fieldType="long" size="11" isKey="true" />
        <field name="fyear" fieldType="integer" size="11"/>
        <field name="fmonth" fieldType="integer" size="11"/>
        <field name="fhours" fieldType="integer" size="11"/>
        <field name="invoice" fieldType="double" size="12"/>
        <field name="descr" fieldType="varchar" size="255"/>
                <field name="runDate" fieldType="varchar" size="50"/>
        <field name="modDate" fieldType="timestamp" size="19" defaultValue="0000-00-00 00:00:00"/>
        <field name="user" fieldType="varchar" size="32" defaultValue="root"/>

                <interceptor classname = "interceptors.CheckForecastValues" />

    </query>

*** config

whats wrong, can anybody help me

regard rolf steiner