When setting up the workspace via

./gradlew setupDecompWorkspace

the following error is encountered:

Expiring Daemon because JVM Tenured space is exhausted Daemon will be stopped at the end of the build after running out of JVM memory Expiring Daemon because JVM Tenured space is exhausted :1.8.9:decompileMc FAILED

This can be fixed by adding a gradle.properties file containing
org.gradle.jvmargs=-Xmx4096m -XX:MaxPermSize=4096m -XX:+HeapDumpOnOutOfMemoryError