Thanks Alexey.
I have fixed these warnings with upgrading my weld dependency:
<dependency>
<groupId>org.jboss.weld</groupId>
<artifactId>weld-core</artifactId>
<version>1.0.1-Final</version>
<scope>test</scope>
</dependency>
to
<dependency>
<groupId>org.jboss.weld</groupId>
<artifactId>weld-core</artifactId>
<version>1.1.0.Final</version>
<scope>test</scope>
</dependency>
But since I switched this depency I'm getting 2 new warnings :( Currently since my project based on a not updated seam 3 example with much customizings from my side i'm not sure if I need these files any longer...
Description Resource Path Location Type
No grammar constraints (DTD or XML schema) detected for the document. arquillian.xml /myWebapp/src/test/resources line 1 XML Problem
No grammar constraints (DTD or XML schema) detected for the document. jboss-scanning.xml /myWebapp/src/main/webapp/WEB-INF line 1 XML Problem