add Java 8 specific source code to check that compiler is configured with source/target 1.8

git-svn-id: https://svn.apache.org/repos/asf/maven/plugin-tools/trunk@1809797 13f79535-47bb-0310-9956-ffa450edef68

maven-plugin-plugin/src/it/java-basic-annotations-jdk8/src/main/java/org/apache/maven/plugin/coreit/TestInterface.java

@@ -0,0 +1,30 @@
+package fr.ca;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+public interface TestInterface {
+
+    /**
+     * Java 8 required to support such default method implementation
+     */
+    public default void foo(){
+
+    }
+}

maven-plugin-plugin/src/it/mplugin-272_java8/src/main/java/fr/ca/TestInterface.java

@@ -21,6 +21,9 @@ package fr.ca;
 
 public interface TestInterface {
 
+    /**
+     * Java 8 required to support such default method implementation
+     */
     public default void foo(){
 
     }