You have the wrong antlr in your project.
The one you need is this. I hope it helps :)
<dependency>
<groupId>antlr</groupId>
<artifactId>antlr</artifactId>
<version>2.7.7</version>
</dependency>
I also see that you are using a older version of hibernate. Latest one available is
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.3.5.Final</version>
</dependency>