This buildfile is part of projectlombok.org. It sets up the build itself. Your ssh.configuration file is corrupted; delete it and rerun this script. The keyfile configured in your ${ssh.configuration.file} file does not exist. Aborted File ${ssh.keyfile} does not exist Your connection info has been written to ${ssh.configuration.file} and will be remembered for future invocations. 0 build ver has been incremented, neccessitating a clean... ${build.version} A new version of ivyplusplus was required and has been downloaded. Rerun the script to continue. To ensure stable builds and avoid accessing API that was not available in JDK6, most of lombok is set up to build against OpenJDK6's runtime, which will now be downloaded... To test java8, we need a java8 runtime, which will now be downloaded... To test in eclipse, we need a java runtime, which will now be downloaded... Supply ant with -Ddeps.conf=confname to pick the configuration you want to fetch ant needs to be at least v1.10.0 or higher to build lombok. Your version is: ${ant.version} lombok must be compiled on jdk11 or later. Your version is: ${ant.java.version}