Rob Winch opened SPR-15985 and commented

Consider updating to Gradle 4.2 https://docs.gradle.org/4.2/release-notes.html

Affects: 5.0 RC4

Issue Links:

• Upgrade to Gradle 4.1 for clean JDK 9 build compatibility [SPR-15667] #20226 Upgrade to Gradle 4.1 for clean JDK 9 build compatibility
• Upgrade to Gradle 4.3(.1) [SPR-16080] #20629 Upgrade to Gradle 4.3(.1)

Referenced from: commits ba74e42, 95fdfac