update Gradle to 7.0

Had to disable java.modularity.inferModulePath, because JUnit
was put on the module path and didn't want to start (class not
found). Probably because I didn't have a module-info.java.

build.gradle

@@ -35,9 +35,9 @@ sourceCompatibility = javaVersion
  * The shared configuration for all sub-projects:
  */
 subprojects {
-	apply plugin: 'java'
+	apply plugin: 'java-library'
 	apply plugin: 'eclipse'
-	apply plugin: 'maven'
+	//apply plugin: 'maven'
 	apply plugin: 'maven-publish'
 	apply plugin: 'me.champeau.gradle.jmh'
 
@@ -79,6 +79,11 @@ subprojects {
 	
 	java {
 		withSourcesJar()
+		
+		// Gradle 7.0 put half the dependencies on the module path. But without a module-info.java file 
+		// JUnit didn't want to run because of a class not found error. By disabling modules we ensure
+		// all jars are put on the classpath.
+		modularity.inferModulePath.set(false)
 	}
 
 		
@@ -86,8 +91,8 @@ subprojects {
 	dependencies {
 		testImplementation "org.junit.jupiter:junit-jupiter-api:${version_junit}"
 		testImplementation "org.junit.jupiter:junit-jupiter-params:${version_junit}"  // for @ParameterizedTest
-    	testRuntime "org.junit.jupiter:junit-jupiter-engine:${version_junit}"
-    	testRuntime "org.junit.platform:junit-platform-launcher:${version_junit_platform}" // needed by eclipse
+    	testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:${version_junit}"
+    	testRuntimeOnly "org.junit.platform:junit-platform-launcher:${version_junit_platform}" // needed by eclipse
 	}
 	
 	test {
@@ -103,5 +108,5 @@ subprojects {
 }
 
 wrapper {
-	gradleVersion = '6.8.3'
+	gradleVersion = '7.0'
 }