Add test for signature polymorphic methods

Author: uschindler

build.xml

@@ -633,6 +633,9 @@
     <condition property="-gen.sunmisc">
       <available classname="sun.misc.BASE64Encoder"/>
     </condition>
+    <condition property="-gen.jdk7">
+      <available classname="java.lang.invoke.MethodHandle"/>
+    </condition>
     <condition property="-gen.jdk8">
       <hasmethod classname="java.util.Collections" method="emptySortedSet"/>
     </condition>
@@ -655,14 +658,21 @@
       nowarn="true" source="1.6" target="1.6" debug="true" deprecation="false" encoding="${build.encoding}"/>
   </target>
 
+  <target name="-generate-test-classes-jdk7" if="-gen.jdk7">
+    <echo level="info" message="Generating test classes for Java 7:"/>
+    <delete dir="src/test/antunit" includes="Java7*.class"/>
+    <javac includeantruntime="false" srcdir="src/test/antunit" destdir="src/test/antunit" includes="Java7*.java"
+      nowarn="true" source="1.7" target="1.7" debug="true" deprecation="false" encoding="${build.encoding}"/>
+  </target>
+  
   <target name="-generate-test-classes-jdk8" if="-gen.jdk8">
     <echo level="info" message="Generating test classes for Java 8:"/>
     <delete dir="src/test/antunit" includes="Java8*.class"/>
     <javac includeantruntime="false" srcdir="src/test/antunit" destdir="src/test/antunit" includes="Java8*.java"
       nowarn="true" source="1.8" target="1.8" debug="true" deprecation="false" encoding="${build.encoding}"/>
   </target>
 
-  <target name="generate-test-classes" depends="-generate-test-classes-init,-generate-test-classes-sunmisc,-generate-test-classes-jdk6,-generate-test-classes-jdk8" description="Regenerates .class files used by tests if the current JDK version supports it"/>
+  <target name="generate-test-classes" depends="-generate-test-classes-init,-generate-test-classes-sunmisc,-generate-test-classes-jdk6,-generate-test-classes-jdk7,-generate-test-classes-jdk8" description="Regenerates .class files used by tests if the current JDK version supports it"/>
 
   <target name="show-help-mojo" depends="install-maven-artifacts" description="Shows help about mojo usage">
     <artifact:mvn mavenVersion="${maven.version}" failonerror="true" fork="${maven.fork}" taskname="help">

src/test/antunit/Java7MethodHandles.class

@@ -0,0 +1,30 @@
+/*
+ * (C) Copyright Uwe Schindler (Generics Policeman) and others.
+ *
+ * Licensed 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.
+ */
+
+/* The binary class file is packaged together with the source distribution.
+ */
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+
+class Java7MethodHandles {
+  static void main(String... args) throws Throwable {
+    MethodHandle mh = MethodHandles.publicLookup().findVirtual(StringBuilder.class, "append",
+      MethodType.methodType(StringBuilder.class, int.class));
+    StringBuilder result = (StringBuilder) mh.invoke(new StringBuilder(), 1);
+  }
+}

src/test/antunit/Java7MethodHandles.java

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ * (C) Copyright Uwe Schindler (Generics Policeman) and others.
+ *
+ * Licensed 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.
+-->
+<project xmlns:au="antlib:org.apache.ant.antunit">
+
+  <condition property="has.MethodHandle">
+    <available classname="java.lang.invoke.MethodHandle"/>
+  </condition>
+  
+  <target name="testSignaturePolymorphic" if="has.MethodHandle">
+    <au:expectfailure expectedMessage="Check for forbidden API calls failed, see log">
+      <forbiddenapis failOnMissingClasses="false">
+        <file file="Java7MethodHandles.class"/>
+        java.lang.invoke.MethodHandle#invoke(java.lang.Object[]) @ Forbidden signature polymorphic method
+      </forbiddenapis>
+    </au:expectfailure>
+    <au:assertLogContains level="error" text="Forbidden method invocation (signature polymorphic): java.lang.invoke.MethodHandle#invoke(java.lang.Object[]) [Forbidden signature polymorphic method]"/> 
+    <au:assertLogContains level="error" text=" 1 error(s)"/> 
+  </target>
+  
+</project>