Spring security warning in Eclipse

I get the following warning in Eclipse

Class 'org.springframework.security.core.authority.AuthorityUtils' is abstract [config set: project/web-context] line 7

The application context XML first lines are

<beans xmlns="http://ift.tt/GArMu6"
    xmlns:security="http://ift.tt/1c8inpe"
    xmlns:xsi="http://ift.tt/ra1lAU"
    xsi:schemaLocation="http://ift.tt/GArMu6
          http://ift.tt/1jdM0fG
          http://ift.tt/1c8inpe
          http://ift.tt/18sW2ay">

Do you know the reason? I'm not referencing directly that class.