I have an EAR project which is also a maven project but I get the following error in the Eclipse Workspace:
Cannot change version of project facet EAR to 1.3.
It looks like the m2e-wtp maven plugin is trying to change the EAR facet version to 1.3 when it is set to 5.0.
I didn't insert any instruction within the pom.xml file as regard the facet version and the following file looks good (no 1.3 references there):
Why the m2eclipse plugin is trying to convert my project facet to 1.3?
Double check the versions of the Java EE JARs you are including in your POM, perhaps one of them is for the older J2EE 1.3 version. Also check the versions mention in web.xml, application.xml and other files, those can also sometimes cause problems like this.