Make ExtendedGroovyClassLoader compatible with Java 9

Closes gh-10445

spring-boot-cli/src/main/java/org/springframework/boot/cli/compiler/ExtendedGroovyClassLoader.java

@@ -175,7 +175,8 @@ public class ExtendedGroovyClassLoader extends GroovyClassLoader {
 
 		DefaultScopeParentClassLoader(ClassLoader parent) {
 			super(parent);
-			this.groovyOnlyClassLoader = new URLClassLoader(getGroovyJars(parent), null);
+			this.groovyOnlyClassLoader = new URLClassLoader(getGroovyJars(parent),
+					parent.getParent());
 		}
 
 		private URL[] getGroovyJars(final ClassLoader parent) {
@@ -232,7 +233,9 @@ public class ExtendedGroovyClassLoader extends GroovyClassLoader {
 		@Override
 		protected Class<?> loadClass(String name, boolean resolve)
 				throws ClassNotFoundException {
-			this.groovyOnlyClassLoader.loadClass(name);
+			if (!name.startsWith("java.")) {
+				this.groovyOnlyClassLoader.loadClass(name);
+			}
 			return super.loadClass(name, resolve);
 		}
 

spring-boot-cli/src/test/java/org/springframework/boot/cli/compiler/ExtendedGroovyClassLoaderTests.java

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -64,4 +64,10 @@ public class ExtendedGroovyClassLoaderTests {
 		this.defaultScopeGroovyClassLoader.loadClass("java.lang.Boolean");
 	}
 
+	@Test
+	public void loadsSqlTypes() throws Exception {
+		this.contextClassLoader.loadClass("java.sql.SQLException");
+		this.defaultScopeGroovyClassLoader.loadClass("java.sql.SQLException");
+	}
+
 }