join - One-to-many mapping in hibernate -

my levelterm.hbm.xml file is:

 <hibernate-mapping> <class name="com.entity.levelterm" table="level_term" catalog="test">     <id name="levelid" type="java.lang.integer">         <column name="level_id" />         <generator class="identity" />     </id>     <property name="level" type="int">         <column name="level" not-null="true" />     </property>     <property name="term" type="int">         <column name="term" not-null="true" />     </property>     <property name="session" type="int">         <column name="session" not-null="true" />     </property>      <list name="list_course">          <key column="level_id"/>         <one-to-many column="course_code" class="com.entity.course"/>          </list>       </class> </hibernate-mapping> 

and levelterm class is:

@entity public class levelterm  implements java.io.serializable {   @id  @generatedvalue(strategy= generationtype.auto)  private integer levelid;  private int level;  private int term;  private int session;   @onetomany  private list<course>list_course;    public list<course> getlist_course() {     return list_course; }  public void setlist_course(list<course> list_course) {     this.list_course = list_course; }  public list<student> getlist_student() {     return list_student; }  public void setlist_student(list<student> list_student) {     this.list_student = list_student; }  public levelterm() { }  public levelterm(int level, int term, int session) {    this.level = level;    this.term = term;    this.session = session; }  public integer getlevelid() {     return this.levelid; }  public void setlevelid(integer levelid) {     this.levelid = levelid; } public int getlevel() {     return this.level; }  public void setlevel(int level) {     this.level = level; } public int getterm() {     return this.term; }  public void setterm(int term) {     this.term = term; } public int getsession() {     return this.session; }  public void setsession(int session) {     this.session = session; } 

}

and hibernate.cfg.xml configuration file is:

<hibernate-configuration>  <session-factory>   <property name="hibernate.dialect">org.hibernate.dialect.mysqldialect</property>   <property name="hibernate.connection.driver_class">com.mysql.jdbc.driver</property>   <property name="hibernate.connection.url">jdbc:mysql://localhost/test</property>   <property name="hibernate.connection.username">root</property>   <property name="hibernate.current_session_context_class">thread </property>   <property name="hibernate.hbm2ddl.auto">create</property>   <mapping resource="com.entity/student.hbm.xml"/>   <mapping resource="com/entity/address.hbm.xml"/>   <mapping resource="com.entity/course.hbm.xml"/>   <mapping resource="com.entity/levelterm.hbm.xml"/>  </session-factory> </hibernate-configuration> 

my code supposed create join table "level_term_list_course" in mysql database. no table created.

no, mapping not supposed generate join-table. looks uni-directional one-to-many association, , managed foreign-key on many side (the courses in example). take @ this example , associated explanations. de facto sql way of having one-to-many association.

also, if need join table, might need akin this example in hibernate docs. basically, if need join-table in uni-directional one-to-many assocation, use many-to-many element unique attribute set true; makes association one-to-many.