We need to downgrade to Ant 1.9.9.
ipv6guruGavin <https://issues.apache.org/jira/secure/ViewProfile.jspa?name=ipv6guru> added a comment - 3 hours ago So yesterday all nodes/slaves had two new Ant versions installed - 1.9.9 and 1.10.1. 1.10.1 was symlinked to latest. 1.10.1 also has Java 8 as a requirement. Any builds that dont use Java 8 should pick 1.9.9 or earlier from the drop down choices. See the builds@ list for the announcement