There are several examples of MANIFEST.MF files in Development guide for web services(0.7715163) taken from upstream documentation.

My proposal is to keep them updated and/or containing only necessary stuff:

• update Created-By with some version of supported Java (Created-By: 1.8.0_71-b15 (Oracle Corporation)) or even better remove it
• remove Ant-Version

one of current examples:

Manifest-Version:1.0
Ant-Version: Apache Ant1.8.2
Created-By:1.7.0_25-b15 (Oracle Corporation)
Dependencies: org.jboss.ws.cxf.jbossws-cxf-client,org.apache.cxf.impl

sufficient MANIFEST file:

Manifest-Version: 1.0
Dependencies: org.jboss.ws.cxf.jbossws-cxf-client,org.apache.cxf.impl

And also, if I understand correctly the specification, there must be a SPACE after colon attribute-name: value
reference https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html