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POGenericDAO with Guice, playing with Generics and ParameterizedType
 

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    <p>most people should be familiar with making a Generic DAO for Spring + hibernate. The reference is from here <a href="http://www.ibm.com/developerworks/java/library/j-genericdao/index.html" rel="nofollow noreferrer">http://www.ibm.com/developerworks/java/library/j-genericdao/index.html</a> but there is an improvement to it on <a href="https://stackoverflow.com/questions/3888575/single-dao-generic-crud-methods-jpa-hibernate-spring">Single DAO &amp; generic CRUD methods (JPA/Hibernate + Spring)</a></p> <p>This improvement is the detection of the type as it is part of the superclass, instead of using the constructor to tell which class it is</p> <pre><code>public GenericDaoJpaImpl() { ParameterizedType genericSuperclass = (ParameterizedType) getClass() .getGenericSuperclass(); this.entityClass = (Class&lt;T&gt;) genericSuperclass .getActualTypeArguments()[0]; } </code></pre> <p>HOWEVER, this cast will fail with Guice. To be injected, the interface and the class need to be binded in a module like this</p> <pre><code>bind(TestDao.class).to(TestDaoImpl.class); </code></pre> <p>And by doing so the constructor trick for our GenericDAO won't work because of the following:</p> <pre><code>getClass().getGenericSuperclass() = java.lang.Class getClass().getName() = com.gwtplatform.samples.basic.server.dao.TestDaoImpl$$EnhancerByGuice$$5fe0d6fd </code></pre> <p>contrary to what a Spring + Hibernate returns</p> <pre><code>getClass().getGenericSuperclass() = sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl getClass().getName() = com.gwtplatform.samples.basic.server.dao.TestDaoImpl </code></pre> <p>I'm just using a super constructor in my extended DAOs now, but still would like to obtain the type instead of providing it, any ideas?</p>
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