add access restrictions for a few unwelcome classes

build.gradle

@@ -1,3 +1,5 @@
+import org.gradle.plugins.ide.eclipse.model.AccessRule
+
 apply plugin: 'java'
 apply plugin: 'eclipse'
 
@@ -34,6 +36,18 @@ ext {
     lib_spring_boot_mustache='org.springframework.boot:spring-boot-starter-mustache:2.1.2.RELEASE'
     lib_spring_boot_test='org.springframework.boot:spring-boot-starter-test:2.1.2.RELEASE'
     lib_spring_boot_web='org.springframework.boot:spring-boot-starter-web:2.1.2.RELEASE'
+    
+    eclipseAccessRestrictions = [
+        'org.eclipse.jdt.launching.JRE_CONTAINER': [
+                 new AccessRule('nonaccessible', 'com/sun/**'),
+                 new AccessRule('nonaccessible', 'java/awt/List'),
+                 new AccessRule('nonaccessible', 'sun/**'),
+        ],
+        'assertj-core': [
+            new AccessRule('nonaccessible', 'org/assertj/core/internal/**'),
+            new AccessRule('nonaccessible', 'org/assertj/core/util/Arrays')
+        ]
+    ]
 }
 
 /*
@@ -72,6 +86,21 @@ subprojects {
 	dependencies {
 		testCompile group: 'org.testng', name: 'testng', version: '6.14.3'
 	}
+	
+	eclipse {
+        classpath {
+            file {
+                whenMerged {
+                    eclipseAccessRestrictions.each{ path, restrictions ->
+                        def container = entries.find { it.path.contains path }
+                        if (container != null) {
+                            container.accessRules.addAll(restrictions)
+                        }    
+                    }
+                }
+            }
+        }
+    }
 }
 
 allprojects {