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<a class="user-hover" rel="elizabeth.chatman" id="email_elizabeth.chatman" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=elizabeth.chatman" style="color:#6c797f;">Elizabeth Chatman</a>
commented on <img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7557'>HHH-7557</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7557'><strong>Map entries get deleted</strong></a>
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<div class="comment-block" style="background-color:#edf5ff;border:1px solid #dddddd;color:#000000;padding:12px;"><p>Here is a summary of the important bits of the mappings and code, so you don't have to download the attachment to understand the problem:</p>
<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>MapValue.java</b></div><div class="codeContent panelContent">
<pre class="code-java">@Entity @Table(name=<span class="code-quote">"map_value"</span>)
<span class="code-keyword">public</span> class MapValue {
@Id @GeneratedValue @Column(name=<span class="code-quote">"id"</span>, unique=<span class="code-keyword">true</span>, nullable=<span class="code-keyword">false</span>)
<span class="code-keyword">private</span> <span class="code-object">Long</span> id;
@Column(name=<span class="code-quote">"name"</span>, unique=<span class="code-keyword">true</span>, nullable=<span class="code-keyword">false</span>)
<span class="code-keyword">private</span> <span class="code-object">String</span> name;
<span class="code-comment">//[...getters/setters...]
</span>
@Override
<span class="code-keyword">public</span> <span class="code-object">int</span> hashCode() {
<span class="code-keyword">final</span> <span class="code-object">int</span> prime = 31;
<span class="code-object">int</span> result = 1;
result = prime * result + ((getName() == <span class="code-keyword">null</span>) ? 0 : getName().hashCode());
<span class="code-keyword">return</span> result;
}
@Override
<span class="code-keyword">public</span> <span class="code-object">boolean</span> equals(<span class="code-object">Object</span> obj) {
<span class="code-keyword">if</span>(<span class="code-keyword">this</span> == obj) <span class="code-keyword">return</span> <span class="code-keyword">true</span>;
<span class="code-keyword">if</span>(obj == <span class="code-keyword">null</span> || !(obj <span class="code-keyword">instanceof</span> MapValue)) <span class="code-keyword">return</span> <span class="code-keyword">false</span>;
MapValue other = (MapValue) obj;
<span class="code-keyword">if</span>(getName() == <span class="code-keyword">null</span>) {
<span class="code-keyword">if</span>(other.getName() != <span class="code-keyword">null</span>) {
<span class="code-keyword">return</span> <span class="code-keyword">false</span>;
}
} <span class="code-keyword">else</span> <span class="code-keyword">if</span>(!getName().equals(other.getName())) {
<span class="code-keyword">return</span> <span class="code-keyword">false</span>;
}
<span class="code-keyword">return</span> <span class="code-keyword">true</span>;
}
}</pre>
</div></div>
<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>MapKey.java</b></div><div class="codeContent panelContent">
<pre class="code-java">@Entity
@Table(name=<span class="code-quote">"map_key"</span>, uniqueConstraints = {
@UniqueConstraint(columnNames = {<span class="code-quote">"name"</span>,<span class="code-quote">"default_map_value_id"</span>})
})
<span class="code-keyword">public</span> class MapKey {
@Id @GeneratedValue @Column(name=<span class="code-quote">"id"</span>, unique=<span class="code-keyword">true</span>, nullable=<span class="code-keyword">false</span>)
<span class="code-keyword">private</span> <span class="code-object">Long</span> id;
@Column(name=<span class="code-quote">"name"</span>, nullable=<span class="code-keyword">false</span>)
<span class="code-keyword">private</span> <span class="code-object">String</span> name;
@ManyToOne @JoinColumn(name=<span class="code-quote">"default_map_value_id"</span>, nullable=<span class="code-keyword">false</span>)
<span class="code-keyword">private</span> MapValue defaultValue;
<span class="code-comment">//[...getters/setters...]
</span>
@Override
<span class="code-keyword">public</span> <span class="code-object">int</span> hashCode() {
<span class="code-keyword">final</span> <span class="code-object">int</span> prime = 31;
<span class="code-object">int</span> result = 1;
result = prime * result + ((getDefaultValue() == <span class="code-keyword">null</span>) ? 0 : getDefaultValue().hashCode());
result = prime * result + ((getName() == <span class="code-keyword">null</span>) ? 0 : getName().hashCode());
<span class="code-keyword">return</span> result;
}
@Override
<span class="code-keyword">public</span> <span class="code-object">boolean</span> equals(<span class="code-object">Object</span> obj) {
<span class="code-keyword">if</span>(<span class="code-keyword">this</span> == obj) <span class="code-keyword">return</span> <span class="code-keyword">true</span>;
<span class="code-keyword">if</span>(obj == <span class="code-keyword">null</span> || !(obj <span class="code-keyword">instanceof</span> MapKey)) <span class="code-keyword">return</span> <span class="code-keyword">false</span>;
MapKey other = (MapKey) obj;
<span class="code-keyword">if</span>(getDefaultValue() == <span class="code-keyword">null</span>) {
<span class="code-keyword">if</span>(other.getDefaultValue() != <span class="code-keyword">null</span>) {
<span class="code-keyword">return</span> <span class="code-keyword">false</span>;
}
} <span class="code-keyword">else</span> <span class="code-keyword">if</span>(!getDefaultValue().equals(other.getDefaultValue())) {
<span class="code-keyword">return</span> <span class="code-keyword">false</span>;
}
<span class="code-keyword">if</span>(getName() == <span class="code-keyword">null</span>) {
<span class="code-keyword">if</span>(other.getName() != <span class="code-keyword">null</span>) {
<span class="code-keyword">return</span> <span class="code-keyword">false</span>;
}
} <span class="code-keyword">else</span> <span class="code-keyword">if</span>(!getName().equals(other.getName())) {
<span class="code-keyword">return</span> <span class="code-keyword">false</span>;
}
<span class="code-keyword">return</span> <span class="code-keyword">true</span>;
}
}</pre>
</div></div>
<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>MapHolder.java</b></div><div class="codeContent panelContent">
<pre class="code-java">@Entity @Table(name=<span class="code-quote">"map_holder"</span>)
<span class="code-keyword">public</span> class MapHolder {
@Id @GeneratedValue @Column(name=<span class="code-quote">"id"</span>, unique=<span class="code-keyword">true</span>, nullable=<span class="code-keyword">false</span>)
<span class="code-keyword">private</span> <span class="code-object">Long</span> id;
@ManyToMany
@JoinTable(name=<span class="code-quote">"map_key_map_value"</span>,
joinColumns=@JoinColumn(name=<span class="code-quote">"map_holder_id"</span>, nullable=<span class="code-keyword">false</span>),
inverseJoinColumns=@JoinColumn(name=<span class="code-quote">"map_value_id"</span>, nullable=<span class="code-keyword">false</span>))
@MapKeyJoinColumn(name=<span class="code-quote">"map_key_id"</span>, nullable=<span class="code-keyword">false</span>)
<span class="code-keyword">private</span> Map<MapKey,MapValue> map;
<span class="code-comment">//[...getters/setters...]
</span>}</pre>
</div></div>
<p>Inserting values into the map works just fine.<br/>
After some values have been succesfully inserted, the following code (using a new unique key/value pair) causes all but one entry to be deleted from the map:</p>
<div class="code panel" style="border-width: 1px;"><div class="codeHeader panelHeader" style="border-bottom-width: 1px;"><b>Test Case</b></div><div class="codeContent panelContent">
<pre class="code-java">Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();
MapHolder mapHolder = (MapHolder) session.get(MapHolder.class, mapHolderId);
<span class="code-comment">// This passes - the map is not empty at <span class="code-keyword">this</span> point:
</span><span class="code-keyword">assert</span>(mapHolder.getMap().size() > 0);
MapValue mapValue = <span class="code-keyword">new</span> MapValue();
mapValue.setName(valueString);
session.save(mapValue);
MapKey mapKey = <span class="code-keyword">new</span> MapKey();
mapKey.setDefaultValue(mapValue);
mapKey.setName(keyString);
session.save(mapKey);
mapHolder.getMap().put(mapKey, mapValue);
tx.commit();
session.close();</pre>
</div></div>
<p>Now if you open a new session and load the same map, you can see that there is only 1 entry in the map (the newly inserted entry). All previous entries were deleted.</p></div>
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