workaround to make spotless work with java 17 (https://github.com/diffplug/spotless/tree/main/plugin-gradle#google-java-format)

Author: johanneshiry

gradle.properties

@@ -9,11 +9,20 @@
 
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
-org.gradle.jvmargs=-Xmx4096m
+
+# Workaround to make spotless work with java 17 -
+# see https://github.com/diffplug/spotless/tree/main/plugin-gradle#google-java-format and
+# https://github.com/ie3-institute/PowerSystemUtils/issues/200 for details
+org.gradle.jvmargs=-Xmx4096m \
+  --add-exports jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED \
+  --add-exports jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED \
+  --add-exports jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED \
+  --add-exports jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED \
+  --add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED
 
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
 # org.gradle.parallel=true
 
-com.github.maiflai.gradle-scalatest.mode = append
+com.github.maiflai.gradle-scalatest.mode = append

gradle/scripts/spotless.gradle

@@ -10,7 +10,7 @@ spotless {
 	//sets a license header, removes unused imports and formats conforming to the google java format
 	java {
 		removeUnusedImports() // removes any unused imports
-		googleJavaFormat()
+		googleJavaFormat('1.13.0')
 		licenseHeader ie3LicHead
 	}