project to demonstrate code in Spotless that requires Java 9+

This is a simple project to demonstrate ties to Java 9+ in the bytecode for Spotless even though Spotless is expected to work with Java 8. [https://jira.mongodb.org/browse/JAVA-2559](This ticket) has a useful explanation for what the underlying cause may be.

Although the project uses version 5.17.0 of the Spotless Gradle plugin, I was able to reproduce the problem with the following versions as well:

• 5.4.0
• 6.0.0
• 6.1.2

pre-requisites

• a Java SE 8 installation
• a Java SE 11 installation
• the ability to switch between the two using the environment variable JAVA_HOME

steps

seeing the problem when using Java 8

• set JAVA_HOME to point to your Java SE 8 installation
• run ./gradlew -v and confirm that the entry for JVM matches your Java SE 8 installation
• run ./gradlew spotlessCheck

Here is the failure you should expect to see:

> Task :spotlessMisc FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':spotlessMisc'.
> java.nio.ByteBuffer.clear()Ljava/nio/ByteBuffer;

seeing graceful reporting when using Java 11

• set JAVA_HOME to point to your Java SE 11 installation
• run ./gradlew -v and confirm that the entry for JVM matches your Java SE 11 installation
• run ./gradlew spotlessCheck

Here is the failure you should expect to see:

> Task :spotlessMisc FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':spotlessMisc'.
> Encoding error! Spotless uses UTF-8 by default.  At line 14 col 176:
  spa�ol  <- UTF-8
  spañol  <- windows-1252
  spañol  <- ISO-8859-1
  spa隳l ( <- Big5
  spa隳l ( <- Big5-HKSCS
  spa駉l ( <- GBK
  spa駉l ( <- GB18030