Referential integrity constraint violation. H2 database -

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im using h2 database. im have tables student(n_zk,fio,propiska....etc) , ekzamen(n_zk, pred, ocenka). ekzamen contains foreign key n_zk student. pieces of code:

connecting database:

public studentdao() throws exception { string url = "jdbc:h2:file:e:/kursach/db/db"; string user = "weaver"; string password = "12345";  // connect database myconn = drivermanager.getconnection(url,user,password);  system.out.println("db connection successful to: " + url);   }

method addekzamen:

public void addekzamen(ekzamen theekzamen) throws exception { preparedstatement mystmt = null;  try { mystmt = myconn.preparestatement( "insert ekzamen "  + " (n_zk, pred, ocenka)"   + " values(?, ?, ?)");  //установить значения mystmt.setint(1, theekzamen.getnzk()); mystmt.setstring(2, theekzamen.getpred()); mystmt.setint(3, theekzamen.getocenka());  //применить sql mystmt.executeupdate(); } { close(mystmt); }  }

main:

public static void main(string[] args) throws exception { studentdao dao = new studentdao(); ekzamen e = new ekzamen(17,"economic",5); dao.addekzamen(e); }

im getting error:

exception in thread "main" org.h2.jdbc.jdbcsqlexception:

referential integrity constraint violation: "student: public.ekzamen foreign key(n_zk) references public.student(n_zk) (0)"; sql statement: insert ekzamen  (n_zk, pred, ocenka) values(?, ?, ?) [23506-176]     @ org.h2.message.dbexception.getjdbcsqlexception(dbexception.java:344)     @ org.h2.message.dbexception.get(dbexception.java:178)     @ org.h2.message.dbexception.get(dbexception.java:154)     @ org.h2.constraint.constraintreferential.checkrowowntable(constraintreferential.java:373)     @ org.h2.constraint.constraintreferential.checkrow(constraintreferential.java:315)     @ org.h2.table.table.fireconstraints(table.java:909)     @ org.h2.table.table.fireafterrow(table.java:927)     @ org.h2.command.dml.insert.insertrows(insert.java:162)     @ org.h2.command.dml.insert.update(insert.java:115)     @ org.h2.command.commandcontainer.update(commandcontainer.java:79)     @ org.h2.command.command.executeupdate(command.java:254)     @ org.h2.jdbc.jdbcpreparedstatement.executeupdateinternal(jdbcpreparedstatement.java:158)     @ org.h2.jdbc.jdbcpreparedstatement.executeupdate(jdbcpreparedstatement.java:144)     @ studenttest.studentdao.addekzamen(studentdao.java:68)     @ studenttest.studentdao.main(studentdao.java:394)


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