Spring application has Cglib2AopProxy warnings

spring spring-aop spring-transactions
Michael Piefel picture Michael Piefel · Oct 2, 2012 · Viewed 16.7k times · Source

Upon starting my application, I get numerous warnings along the lines of o.s.aop.framework.Cglib2AopProxy 'Unable to proxy method [public final void org.springframework.jdbc.core.support.JdbcDaoSupport.setDataSource(javax.sql.DataSource)] because it is final: All calls to this method via a proxy will be routed directly to the proxy.' for about a dozen or so functions.

Now I perfectly understand that proxy-based aspects cannot be applied to final methods. However, I did not (on purpose, at least) try to weave any aspects into JdbcDaoSupport. I suspect it comes from <tx:annotation-driven />. Is there anything I can do to silence these warnings or, better yet, exclude those classes from the aspect weaving?

Answer

Adolfo picture Adolfo · Oct 2, 2012

This is most likely caused by the @Transactional annotation, Spring wraps your DAO in a proxy to add the transactional behavior.

I would recommend to make your DAO implement an Interface (create and use an interface for your DAO), this will allow Spring to use a JDK dynamic proxy instead of having to use CGLib.

Using CGLIB has a limitation that methods marked as final in target class can’t be advised as final methods can’t be overridden (CGLIB creates a subclass of target class at runtime) but this limitation disappears in case of using JDK dynamic proxies.

Reference

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