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Re: Entity hashCode and equals overriding
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created by <a href="https://community.jboss.org/people/fabiovalse">fabio valsecchi</a> in <i>EJB3 Development</i> - <a href="https://community.jboss.org/message/787841#787841">View the full discussion</a>
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<div class="jive-rendered-content"><p class="p1">This is my Cart Entity class:</p><p class="p1" style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p class="p1">-----------------------------------------------------------------</p><p class="p1">@Entity</p><p class="p2"><span class="s1">@Table</span>(name = <span class="s2">"carts"</span>)</p><p class="p2"><span class="s3">public</span> <span class="s3">class</span> Cart <span class="s3">implements</span> Serializable {</p><p class="p3"><span class="s4"> </span>private<span class="s4"> </span>static<span class="s4"> </span>final<span class="s4"> </span>long<span class="s4"> </span><span class="s5">serialVersionUID</span><span class="s4"> = 3L;</span></p><p class="p4">  </p><p class="p2">          <span class="s3">public</span> Cart() {</p><p class="p2">        <span class="s3">super</span>();</p><p class="p2">    }</p><p class="p4">  </p><p class="p1"><span class="s4"> </span>@Id</p><p class="p2">    <span class="s3">private</span> String <span class="s5">username</span>;</p><p class="p1"><span class="s4"> </span>@ElementCollection</p><p class="p2">    <span class="s1">@CollectionTable</span>(name=<span class="s2">"cartsbooks"</span>, joinColumns=<span class="s1">@JoinColumn</span>(name=<span class="s2">"username"</span>))</p><p class="p2">    <span class="s1">@Column</span>(name=<span class="s2">"quantity"</span>)</p><p class="p2">    <span class="s1">@MapKeyJoinColumn</span>(name=<span class="s2">"isbn"</span>, referencedColumnName=<span class="s2">"isbn"</span>)</p><p class="p2">    <span class="s3">private</span> Map<Book,Integer> <span class="s5">articles</span>;</p><p class="p3"><span class="s4"> </span>private<span class="s4"> </span>float<span class="s4"> </span><span class="s5">bill</span><span class="s4">;</span></p><p class="p4">  </p><p class="p2">          <span class="s3">public</span> String getUsername() {</p><p class="p5"><span class="s4">  </span><span class="s3">return</span><span class="s4"> </span>username<span class="s4">;</span></p><p class="p2">          }</p><p class="p2">          <span class="s3">public</span> <span class="s3">void</span> setUsername(String username) {</p><p class="p2">                    <span class="s3">this</span>.<span class="s5">username</span> = username;</p><p class="p2">          }</p><p class="p2">          <span class="s3">public</span> Map<Book,Integer> getArticles() {</p><p class="p5"><span class="s4">  </span><span class="s3">return</span><span class="s4"> </span>articles<span class="s4">;</span></p><p class="p2">          }</p><p class="p2">          <span class="s3">public</span> <span class="s3">void</span> setArticles(Map<Book,Integer> articles) {</p><p class="p2">                    <span class="s3">this</span>.<span class="s5">articles</span> = articles;</p><p class="p2">          }</p><p class="p2">          <span class="s3">public</span> <span class="s3">float</span> getBill() {</p><p class="p3"><span class="s4">  </span>return<span class="s4"> </span><span class="s5">bill</span><span class="s4">;</span></p><p class="p2">          }</p><p class="p2">          <span class="s3">public</span> <span class="s3">void</span> setBill(<span class="s3">float</span> bill) {</p><p class="p2">                    <span class="s3">this</span>.<span class="s5">bill</span> = bill;</p><p class="p2">          }</p><p class="p2">}</p><p>-----------------------------------------------------------------</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>As you can see the getArticles() method returns a HashMap<Book, Integer>, so the subsequent call get(book) should return an Integer value.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thank you!</p></div>
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