jsp - Error with ResultSet.next() -

don't know why receive sqlexception in code:

int i=0; while(result.next()) {       book[i]=bookservice.getbook(database, result.getint("id_number"));       i++; } 

in particulary, first time loop executed second time receive error...i think it's problem of cursor...how can fix it?

stacktrace: org.apache.jasper.servlet.jspservletwrapper.handlejspexception(jspservletwrapper.java:568) org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:455) org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:390) org.apache.jasper.servlet.jspservlet.service(jspservlet.java:334) javax.servlet.http.httpservlet.service(httpservlet.java:728) org.netbeans.modules.web.monitor.server.monitorfilter.dofilter(monitorfilter.java:393) 

root cause

javax.servlet.servletexception: services.databaseservice.exception.resultsetdbexception: general error: error in createarraybook: cartmanagement     org.apache.jasper.runtime.pagecontextimpl.dohandlepageexception(pagecontextimpl.java:912)     org.apache.jasper.runtime.pagecontextimpl.handlepageexception(pagecontextimpl.java:841)     org.apache.jsp.cart_jsp._jspservice(cart_jsp.java:235)     org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:70)     javax.servlet.http.httpservlet.service(httpservlet.java:728)     org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:432)     org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:390)     org.apache.jasper.servlet.jspservlet.service(jspservlet.java:334)     javax.servlet.http.httpservlet.service(httpservlet.java:728)     org.netbeans.modules.web.monitor.server.monitorfilter.dofilter(monitorfilter.java:393) 

root cause

services.databaseservice.exception.resultsetdbexception: general error: error in createarraybook: cartmanagement     bflows.cartmanagement.createarraybook(cartmanagement.java:98)     org.apache.jsp.cart_jsp._jspservice(cart_jsp.java:105)     org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:70)     javax.servlet.http.httpservlet.service(httpservlet.java:728)     org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:432)     org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:390)     org.apache.jasper.servlet.jspservlet.service(jspservlet.java:334)     javax.servlet.http.httpservlet.service(httpservlet.java:728)     org.netbeans.modules.web.monitor.server.monitorfilter.dofilter(monitorfilter.java:393)