title: JPA - Get collection from ManyToOne relationship
body: <p>I have a table Post and Post_Image </p>
  
  <pre><code> @Entity
  @Table(name = "post")
  @XmlRootElement
  @NamedQueries({
      @NamedQuery(name = "Post.findAll", query = "SELECT p FROM Post p"),
      @NamedQuery(name = "Post.findByPostId", query = "SELECT p FROM Post p WHERE p.postId = :postId"),
      @NamedQuery(name = "Post.findByTitle", query = "SELECT p FROM Post p WHERE p.title = :title"),
      @NamedQuery(name = "Post.findByCreatedDatetime", query = "SELECT p FROM Post p WHERE p.createdDatetime = :createdDatetime")})
  public class Post implements Serializable {
      private static final long serialVersionUID = 1L;
      @Id
      @GeneratedValue(strategy = GenerationType.IDENTITY)
      @Basic(optional = false)
      @NotNull
      @Column(name = "post_id")
      private Integer postId;
      @Basic(optional = false)
      @NotNull
      @Size(min = 1, max = 500)
      @Column(name = "title")
      private String title;
      @Basic(optional = false)
      @NotNull
      @Lob
      @Size(min = 1, max = 65535)
      @Column(name = "content")
      private String content;
      @Column(name = "created_datetime")
      @Temporal(TemporalType.TIMESTAMP)
      private Date createdDatetime;
      @JoinColumn(name = "user_id", referencedColumnName = "user_id")
      @ManyToOne(optional = false)
      private User userId;
      @JoinColumn(name = "post_type_id", referencedColumnName = "post_type_id")
      @ManyToOne(optional = false)
      private PostType postTypeId;
  
      public Post() {
          Date date = new Date();
          this.createdDatetime =new Date(date.getTime());
  
      }
  
      public Post(Integer postId) {
          this.postId = postId;
      }
  
      public Post(Integer postId, String title, String content) {
          this.postId = postId;
          this.title = title;
          this.content = content;
      }
  
      public Integer getPostId() {
          return postId;
      }
  
      public void setPostId(Integer postId) {
          this.postId = postId;
      }
  
      public String getTitle() {
          return title;
      }
  
      public void setTitle(String title) {
          this.title = title;
      }
  
      public String getContent() {
          return content;
      }
  
      public void setContent(String content) {
          this.content = content;
      }
  
      public Date getCreatedDatetime() {
          return createdDatetime;
      }
  
      public void setCreatedDatetime(Date createdDatetime) {
          this.createdDatetime = createdDatetime;
      }
  
      public User getUserId() {
          return userId;
      }
  
      public void setUserId(User userId) {
          this.userId = userId;
      }
  
      public PostType getPostTypeId() {
          return postTypeId;
      }
  
      public void setPostTypeId(PostType postTypeId) {
          this.postTypeId = postTypeId;
      }
  
      @Override
      public int hashCode() {
          int hash = 0;
          hash += (postId != null ? postId.hashCode() : 0);
          return hash;
      }
  
      @Override
      public boolean equals(Object object) {
          // TODO: Warning - this method won't work in the case the id fields are not set
          if (!(object instanceof Post)) {
              return false;
          }
          Post other = (Post) object;
          if ((this.postId == null &amp;&amp; other.postId != null) || (this.postId != null &amp;&amp; !this.postId.equals(other.postId))) {
              return false;
          }
          return true;
      }
  
      @Override
      public String toString() {
          return "entity.Post[ postId=" + postId + " ]";
      }
  
  }
  </code></pre>
  
  <p>and </p>
  
  <pre><code>@Entity
  @Table(name = "post_image")
  @XmlRootElement
  @NamedQueries({
      @NamedQuery(name = "PostImage.findAll", query = "SELECT p FROM PostImage p"),
      @NamedQuery(name = "PostImage.findByPostImageId", query = "SELECT p FROM PostImage p WHERE p.postImageId = :postImageId"),
      @NamedQuery(name = "PostImage.findByPath", query = "SELECT p FROM PostImage p WHERE p.path = :path"),
      @NamedQuery(name = "PostImage.findByTitle", query = "SELECT p FROM PostImage p WHERE p.title = :title")})
  public class PostImage implements Serializable {
      private static final long serialVersionUID = 1L;
      @Id
      @Basic(optional = false)
      @NotNull
      @Column(name = "post_image_id")
      private Integer postImageId;
      @Basic(optional = false)
      @NotNull
      @Size(min = 1, max = 500)
      @Column(name = "path")
      private String path;
      @Basic(optional = false)
      @NotNull
      @Size(min = 1, max = 500)
      @Column(name = "title")
      private String title;
      @JoinColumn(name = "post_id", referencedColumnName = "post_id")
      @ManyToOne(optional = false)
      private Post postId;
  
      public PostImage() {
      }
  
      public PostImage(Integer postImageId) {
          this.postImageId = postImageId;
      }
  
      public PostImage(Integer postImageId, String path, String title) {
          this.postImageId = postImageId;
          this.path = path;
          this.title = title;
      }
  
      public Integer getPostImageId() {
          return postImageId;
      }
  
      public void setPostImageId(Integer postImageId) {
          this.postImageId = postImageId;
      }
  
      public String getPath() {
          return path;
      }
  
      public void setPath(String path) {
          this.path = path;
      }
  
      public String getTitle() {
          return title;
      }
  
      public void setTitle(String title) {
          this.title = title;
      }
  
      public Post getPostId() {
          return postId;
      }
  
      public void setPostId(Post postId) {
          this.postId = postId;
      }
  
      @Override
      public int hashCode() {
          int hash = 0;
          hash += (postImageId != null ? postImageId.hashCode() : 0);
          return hash;
      }
  
      @Override
      public boolean equals(Object object) {
          // TODO: Warning - this method won't work in the case the id fields are not set
          if (!(object instanceof PostImage)) {
              return false;
          }
          PostImage other = (PostImage) object;
          if ((this.postImageId == null &amp;&amp; other.postImageId != null) || (this.postImageId != null &amp;&amp; !this.postImageId.equals(other.postImageId))) {
              return false;
          }
          return true;
      }
  
      @Override
      public String toString() {
          return "entity.PostImage[ postImageId=" + postImageId + " ]";
      }
  
  }
  </code></pre>
  
  <p>i want to get collection of images for particular post like
    Collection objPostImage = objPost.getPostImageCollection()
  but manytoone relationship do not provide this functionality to me how can i convert it to one to many or how can i get Image Collection for a post.?
  I am new to java so any help and suggestion will be appreciated 
  thanx in advance...</p>