[Beginner's Corner] - Re: ManyToMany problem
by swenu
Yesterday i moved the code from the entity to the RoleHome.
Now looks like this in RoleHome.java
package ch.emtm.session;
|
| import java.util.ArrayList;
| import java.util.List;
|
| import javax.persistence.EntityManager;
|
| import org.jboss.seam.annotations.Begin;
| import org.jboss.seam.annotations.In;
| import org.jboss.seam.annotations.Logger;
| import org.jboss.seam.annotations.Name;
| import org.jboss.seam.annotations.web.RequestParameter;
| import org.jboss.seam.framework.EntityHome;
| import org.jboss.seam.log.Log;
|
| import ch.emtm.entity.Function;
| import ch.emtm.entity.Role;
| import ch.emtm.entity.RoleFunction;
|
| @Name("roleHome")
| public class RoleHome extends EntityHome<Role>
| {
| @RequestParameter Long roleId;
|
| @Logger
| private Log log;
|
| @In (required=false)
| Function function;
|
| EntityManager em = this.getEntityManager();
|
| @Override
| public Object getId()
| {
| if (roleId == null)
| {
| return super.getId();
| }
| else
| {
| return roleId;
| }
| }
|
| @Override @Begin
| public void create() {
| super.create();
| }
|
| @Override
| public String persist(){
| String returnVal = super.persist();
| this.roleId=this.instance.getId();
| setFunctions(this.instance.getFunctions());
| return returnVal;
| }
|
| @Override
| public String update(){
| String returnVal = super.update();
| this.roleId=this.instance.getId();
| setFunctions(this.instance.getFunctions());
| return returnVal;
| }
|
| public List<Function> getFunctions(){
| return this.instance.getFunctions();
| }
|
| public void setFunctions(List<Function> functions){
| //no function assigned
| if(functions.size() == 0){
| for(RoleFunction rf:this.instance.getRoleFunctions()){
| removeAssignment(rf);
| }
| this.instance.getRoleFunctions().clear();
| }else{
| //there are entries within functions
| if(this.instance.getRoleFunctions() == null || this.instance.getRoleFunctions().size() < 1){
| //No entries within RoleFunctions, so we could add all!
| for(Function f:functions){
| addAssignment(f);
| }
| }else{
| //there are already entries within RoleFunctions
| compareAssignments(functions);
| }
| }
| }
|
| private void compareAssignments(List<Function> functions) {
| log.info("received a list to compare!Assigned are {0} entries - comparing list contains {1} entries",this.instance.getRoleFunctions().size(), functions.size());
| for(Function f:functions){
| boolean newAssignment = true;
| for(RoleFunction rf:this.instance.getRoleFunctions()){
| if(rf.getFunction().getId().equals(f.getId()))
| newAssignment = false;
| }
| if(newAssignment)
| addAssignment(f);
| }
| List<RoleFunction> rmRf = new ArrayList<RoleFunction>();
| for (int i = this.instance.getRoleFunctions().size() - 1; i >= 0; i--){
| boolean unusedAssignment = true;
| for(Function f:functions){
| if(this.instance.getRoleFunctions().get(i).getFunction().getId().equals(f.getId()))
| unusedAssignment = false;
| }
| if(unusedAssignment)
| rmRf.add(this.instance.getRoleFunctions().get(i));
| }
| for(RoleFunction rf:rmRf){
| removeAssignment(rf);
| this.instance.getRoleFunctions().remove(rf);
| }
| }
|
| private void addAssignment(Function f) {
| RoleFunction rf = new RoleFunction();
| rf.setFunction(f);
| rf.setRole(this.instance);
| this.instance.getRoleFunctions().add(rf);
| }
|
| private void removeAssignment(RoleFunction rf) {
| this.em.remove(rf);
| }
| }
RoleFunction.java
package ch.emtm.entity;
|
| import java.io.Serializable;
|
| import javax.persistence.Column;
| import javax.persistence.Entity;
| import javax.persistence.GeneratedValue;
| import javax.persistence.Id;
| import javax.persistence.JoinColumn;
| import javax.persistence.ManyToOne;
|
| import org.jboss.seam.annotations.Name;
|
| @Entity
| @Name("rolefunction")
| public class RoleFunction implements Serializable
| {
| /**
| *
| */
| private static final long serialVersionUID = 1L;
|
| @Id
| @GeneratedValue
| private Long id;
| @Column(name="role_id")
| private long iRoleId;
| @Column(name="function_id")
| private long iFunctionId;
| @ManyToOne
| @JoinColumn(name="role_id", insertable=false, updatable=false)
| private Role role = new Role();
| @ManyToOne
| @JoinColumn(name="function_id", insertable=false, updatable=false)
| private Function function = new Function();
|
| /**
| * @return the id
| */
| public Long getId() {
| return this.id;
| }
| /**
| * @param id the id to set
| */
| public void setId(Long id) {
| this.id = id;
| }
| /**
| * @return the iRoleId
| */
| @SuppressWarnings("unused")
| private long getRoleId() {
| return iRoleId;
| }
| /**
| * @param iRoleId the iRoleId to set
| */
| @SuppressWarnings("unused")
| private void setRoleId(int iRoleId) {
| this.iRoleId = iRoleId;
| }
| /**
| * @return the iFunctionId
| */
| @SuppressWarnings("unused")
| private long getFunctionId() {
| return iFunctionId;
| }
| /**
| * @param iFunctionId the iFunctionId to set
| */
| @SuppressWarnings("unused")
| private void setFunctionId(int iFunctionId) {
| this.iFunctionId = iFunctionId;
| }
| /**
| * @return the roleId
| */
| public Role getRole() {
| return this.role;
| }
| /**
| * @param roleId the roleId to set
| */
| public void setRole(Role role) {
| this.role = role;
| if(role != null && role.getId() != null)
| this.iRoleId = role.getId();
| else
| this.iRoleId = 0L;
| }
| /**
| * @return the functionId
| */
| public Function getFunction() {
| return this.function;
| }
| /**
| * @param functionId the functionId to set
| */
| public void setFunction(Function function) {
| this.function = function;
| if(function != null)
| this.iFunctionId = function.getId();
| else
| this.iFunctionId = 0L;
| }
|
| }
|
Works anything!
Except if i create a new role - the role id isn't present!
I get the following error message:
15:44:36,587 SEVERE [component] /roleList.xhtml @72,97 value="#{roleHome.functions}": Error writing 'functions' on type ch.emtm.session.RoleHome_$$_javassist_seam_3
| java.lang.NullPointerException
| at ch.emtm.session.RoleHome.addAssignment(RoleHome.java:123)
| at ch.emtm.session.RoleHome.setFunctions(RoleHome.java:83)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
i dindn't investigate a lot of time to solve, i will try this evening again.
Would be great if you already could lead to a direction - else i'm sure i'll find something ;)
Thanks in advance - Best regards
Sven
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16 years, 5 months