Java.sql.SQLException: ORA-01400: cannot insert NULL into ("SYSTEM"."DESCRIPTION"."TYPE")

Question

insert into DESCRIPTION (TYPE,DESCRIPTION,IS_HTML,EVENT_ID) values('','','',41)
java.sql.SQLException: ORA-01400: cannot insert NULL into ("SYSTEM"."DESCRIPTION"."TYPE")
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:125)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:305)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:272)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:623)
at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:112)
at oracle.jdbc.driver.T4CStatement.execute_for_rows(T4CStatement.java:474)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1028)
at oracle.jdbc.driver.OracleStatement.executeQuery(OracleStatement.java:1125)
at com.event.struts.InsertDetails.doPost(InsertDetails.java:78)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source
and i my
Action class is
public class InsertDetails extends HttpServlet{
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
Connection conn = null;
try{
List list = (List) req.getSession().getAttribute("listbean");
InputBean ib = (InputBean) list.get(0);
InputBean ib1 = (InputBean) list.get(1);
InputBean ib2 = (InputBean) list.get(2);
InputBean ib3 = (InputBean) list.get(3);
InputBean ib4 = (InputBean) list.get(4);
InputBean ib5 = (InputBean) list.get(5);
InputBean ib6 = (InputBean) list.get(6);
InputBean ib7 = (InputBean) list.get(7);
conn = ConnectionUtils.getConnection();
Statement stmt = conn.createStatement();
String sql1 = "select seq.nextval from DUAL";
ResultSet rs1 = stmt.executeQuery(sql1);
rs1.next();
int event_id = rs1.getInt(1);
//Advanced and general info
String sql2 = "insert into EVENT_INFO (EVENT_ID,EVENT_NAME,SHORT_NAME,EVENT_START_DATE,EVENT_END_DATE,EVENT_START_TIME,EVENT_END_TIME,event_LOCATION,ADDRESS1,ADDRESS2,CITY,STATE,ZIP_CODE,COUNTRY,event_COMMENT,EVENT_OVERVIEW,EXTRA1,EXTRA2,MEMBERSHIP_OPTION,EXTRA3,EXTRA4,EXTRA5,KID,TEEN,ADULT,SENIOR,SENILE,EVENT_TYPE1,EVENT_TYPE2,DETAILED_DESCRIPTION,IS_DETAILED_DESCRIPTION_HTML,ADDITIONAL_URL,BYPASS_INFORMATION_PAGE,CANCELLATION_POLICY,ADDTIONAL_INFO) values("+event_id+",'"+ib.getName()+"','"+ib.getShortname()+"','"+ib.getStartdate()+
"','"+ib.getEnddate()+"','"+ib.getStarttime()+"','"+ib.getEndtime()+"','"+ib.getLocation()+"','"+ib.getAddress1()+"','"+ib.getAddress2()+"','"+
ib.getCity()+"','"+ib.getState()+"','"+ib.getZip()+"','"+ib.getCountry()+"','"+ib.getComment()+"','"+ib.getTextarea()+"','"+ib.getExtra1()+"','"+
ib.getExtra2()+"','"+ib.getExtra3()+"','"+ib.getExtra4()+"','"+ib.getExtra5()+"','"+ib.getExtra6()+"','"+ib.getExtra7()+"','"+ib.getExtra8()+"','"+
ib.getExtra9()+"','"+ib.getExtra10()+"','"+ib.getExtra11()+"','"+ib.getExtra12()+"','"+ib.getExtra13()+"','"+ib1.getTextarea()+"','"+ib1.getExtra1()+"','"+
ib1.getName()+"','"+ib1.getExtra2()+"','"+ib2.getCancellation_policy()+"','"+ib2.getTextarea()+"')";
stmt.executeQuery(sql2);
//Description
List list1 = (List) ib2.getList();
DescriptionBean db = (DescriptionBean) list1.get(0);
DescriptionBean db1 = (DescriptionBean) list1.get(1);
DescriptionBean db2 = (DescriptionBean) list1.get(2);
DescriptionBean db3 = (DescriptionBean) list1.get(3);
DescriptionBean db4 = (DescriptionBean) list1.get(4);
DescriptionBean db5 = (DescriptionBean) list1.get(5);
DescriptionBean db6 = (DescriptionBean) list1.get(6);
if(db.getDescription()!=" "){
String s1 = "insert into DESCRIPTION (TYPE,DESCRIPTION,IS_HTML,EVENT_ID) values('"+db.getDescription()+"','"+db.getTextarea()+"','"+db.getHtmlbutton()+"',"+event_id+")";
stmt.executeQuery(s1);
if(db1.getDescription()!=" "){
String s2 = "insert into DESCRIPTION (TYPE,DESCRIPTION,IS_HTML,EVENT_ID) values('"+db1.getDescription()+"','"+db1.getTextarea()+"','"+db1.getHtmlbutton()+"',"+event_id+")";
stmt.executeQuery(s2);
if(db2.getDescription()!=" "){
String s3 = "insert into DESCRIPTION (TYPE,DESCRIPTION,IS_HTML,EVENT_ID) values('"+db2.getDescription()+"','"+db2.getTextarea()+"','"+db2.getHtmlbutton()+"',"+event_id+")";
System.out.println(s3);
stmt.executeQuery(s3);
if(db3.getDescription()!=" "){
String s4 = "insert into DESCRIPTION (TYPE,DESCRIPTION,IS_HTML,EVENT_ID) values('"+db3.getDescription()+"','"+db3.getTextarea()+"','"+db3.getHtmlbutton()+"',"+event_id+")";
stmt.executeQuery(s4);
if(db4.getDescription()!=" "){
String s5 = "insert into DESCRIPTION (TYPE,DESCRIPTION,IS_HTML,EVENT_ID) values('"+db4.getDescription()+"','"+db4.getTextarea()+"','"+db4.getHtmlbutton()+"',"+event_id+")";
stmt.executeQuery(s5);
if(db5.getDescription()!=" "){
String s6 = "insert into DESCRIPTION (TYPE,DESCRIPTION,IS_HTML,EVENT_ID) values('"+db5.getDescription()+"','"+db5.getTextarea()+"','"+db5.getHtmlbutton()+"',"+event_id+")";
stmt.executeQuery(s6);
if(db6.getDescription()!=" "){
String s7 = "insert into DESCRIPTION (TYPE,DESCRIPTION,IS_HTML,EVENT_ID) values('"+db6.getDescription()+"','"+db6.getTextarea()+"','"+db6.getHtmlbutton()+"',"+event_id+")";
stmt.executeQuery(s7);
//Activity
String sql3 = "insert into ACTIVITY (ACTIVITY_NAME,ACTIVITY_START_DATE,ACTIVITY_END_DATE,ACTIVITY_START_TIME,ACTIVITY_END_TIME,TYPE,CAPACITY,EVENT_ID) values('"+ib3.getName()+"','"+ib3.getStartdate()+"','"+
ib3.getEnddate()+"','"+ib3.getStarttime()+"','"+ib.getEndtime()+"','"+ib3.getExtra1()+"',"+event_id+")";
stmt.executeQuery(sql3);
i put condition for null .But if i dont fill the fields,even then the executeQuery is executing without checking the condition.
wht is the problem
what i want to change in my code.

Answer 1

1. Use code tags when you post code.
2. Use prepared statements.
3. If you have a field that requires a non-null entry then you must provide a non-null value. And for Oracle that means non-empty as well.