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<h2 class="title" style="clear: both"><a id="upgrade_4_8_dpl"></a>Registering DPL Secondary Keys</h2>
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Entity subclasses that define secondary keys must now be
registered prior to storing an instance of the class. This can
be done in two ways:
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The
<code class="methodname">EntityModel.registerClass()</code>
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The
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Failure to register the entity subclass will result in an
<code class="classname">IllegalArgumentException</code> the first
time an attempt is made to store an instance of the subclass.
An exception will not occur if instances of the subclass have
previously been stored, which allows existing applications to
run unmodified in most cases.
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This behavioral change was made to increase reliability. In
several cases, registering an entity subclass has been
necessary as a workaround. The requirement to register the
subclass will ensure that such errors do not occur in deployed
applications.
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