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<p style="margin: 10px 0 0 0">This is probably going to be frowned upon by purists, but until there is a way to configure hibernate to ensure @Embedded fields are non-null, I've written an AspectJ to populate the value if null.</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">public</span> aspect NonNullEmbedded {
<span class="code-comment" style="color: #808080">// define a pointcut <span class="code-keyword" style="color: #000091; color: #808080">for</span> any getter method of a field with @Embedded of type Validity with any name in com.ia.domain <span class="code-keyword" style="color: #000091; color: #808080">package</span>
</span> pointcut embeddedGetter() : get( @javax.persistence.Embedded * com.company.model..* );
/**
* Advice to run before any Embedded getter.
* Checks <span class="code-keyword" style="color: #000091">if</span> the field is <span class="code-keyword" style="color: #000091">null</span>. If it is, then it automatically instantiates the Embedded object.
*/
<span class="code-object" style="color: #910091">Object</span> around() : embeddedGetter(){
<span class="code-object" style="color: #910091">Object</span> value = proceed();
<span class="code-comment" style="color: #808080">// check <span class="code-keyword" style="color: #000091; color: #808080">if</span> <span class="code-keyword" style="color: #000091; color: #808080">null</span>. If so, then instantiate the object and assign it to the model.
</span> <span class="code-comment" style="color: #808080">// Otherwise just <span class="code-keyword" style="color: #000091; color: #808080">return</span> the value retrieved.
</span> <span class="code-keyword" style="color: #000091">if</span>( value == <span class="code-keyword" style="color: #000091">null</span> ){
<span class="code-object" style="color: #910091">String</span> fieldName = thisJoinPoint.getSignature().getName();
<span class="code-object" style="color: #910091">Object</span> obj = thisJoinPoint.getThis();
<span class="code-comment" style="color: #808080">// check to see <span class="code-keyword" style="color: #000091; color: #808080">if</span> the obj has the field already defined or is <span class="code-keyword" style="color: #000091; color: #808080">null</span>
</span> <span class="code-keyword" style="color: #000091">try</span>{
Field field = obj.getClass().getDeclaredField(fieldName);
<span class="code-object" style="color: #910091">Class</span> clazz = field.getType();
value = clazz.newInstance();
field.setAccessible(<span class="code-keyword" style="color: #000091">true</span>);
field.set(obj, value );
}
<span class="code-keyword" style="color: #000091">catch</span>( NoSuchFieldException | IllegalAccessException | InstantiationException e){
e.printStackTrace();
}
}
<span class="code-keyword" style="color: #000091">return</span> value;
}
}
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