Florian Kolbe if you have this type of issue, I recommend you to upgrade to 5.4.1.Final with the following EL dependency:

  <dependency>
     <groupId>org.glassfish</groupId>
     <artifactId>javax.el</artifactId>
     <version>3.0.1-b08</version>
  </dependency>

It should be cleaner and more flexible regarding class loading.