java - persist many-to-many relationship with EJB -


i'm using jpa (hibernate), ejb , cdi bean (jsf). have 2 tables: technology (entity technology.class) , component (entity component.class) many-to-many relationship. entity code:

public class technology implements serializable{ ... @lob @column(nullable=false) private string title; ... @manytomany(mappedby="technologies") private list<component> components; .. }  public class component implements serializable { ... @manytomany     @jointable(         name="technology_has_component"         , joincolumns={             @joincolumn(name="component_title", nullable=false)             }         , inversejoincolumns={             @joincolumn(name="technology_tid", nullable=false)             }         )     private list<technology> technologies; ... }

code in ejb:

@stateless @localbean public void addtech(technology tech) throws exception {          em.persist(tech); }

my jsf page uses cdi bean properties , method:

    @named(value = "adminactiontech")     @sessionscoped     public class adminactiontech implements serializable{     ...      public string gettitle() {         return title;     }      public void settitle(string title) {         this.title = title;     }      public string addtech() {         technology tech = new technology();         tech.settitle(title);             ...          tech.setcomponents(getlistavaicomps());         try {              techservice.addtech(tech);          } catch (exception e) {              e.printstacktrace();         }     }     private list<component> getlistavaicomps() {           list<component> listnewcomponent = new arraylist<component>();           component findcomp = compservice.findcomp(component.gettitle()); // findcomp() method in ejb           listnewcomponent.add(findcomp);           return listnewcomponent;     }

when add new technology title,....,list components. except list components not added. checked technology table, new record created, technology_has_component table has not more record added. debug, , sure, getlistavailcomps method not null. can show me how fix. thanks

you need set @cascadetype on relationship including persist if want new objects persisted when container is.


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