--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/7144981/IgnoreIgnorableCharactersInInput.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,93 @@
+
+/*
+ * @test  /nodynamiccopyright/
+ * @bug 7144981
+ * @summary javac should ignore ignorable characters in input
+ * @modules jdk.compiler
+ * @run main IgnoreIgnorableCharactersInInput
+ */
+
+import com.sun.source.util.JavacTask;
+import java.io.File;
+import java.net.URI;
+import java.util.Arrays;
+import java.util.Set;
+import java.util.TreeSet;
+import javax.tools.JavaCompiler;
+import javax.tools.JavaFileObject;
+import javax.tools.SimpleJavaFileObject;
+import javax.tools.ToolProvider;
+
+public class IgnoreIgnorableCharactersInInput {
+
+    public static void main(String... args) throws Exception {
+        new IgnoreIgnorableCharactersInInput().run();
+    }
+
+    void run() throws Exception {
+        JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
+        File classesDir = new File(System.getProperty("user.dir"), "classes");
+        classesDir.mkdirs();
+        JavaSource[] sources = new JavaSource[]{
+            new JavaSource("TestOneIgnorableChar", "AA\\u0000BB"),
+            new JavaSource("TestMultipleIgnorableChar", "AA\\u0000\\u0000\\u0000BB")};
+        JavacTask ct = (JavacTask)comp.getTask(null, null, null,
+                Arrays.asList("-d", classesDir.getPath()),
+                null, Arrays.asList(sources));
+        try {
+            if (!ct.call()) {
+                throw new AssertionError("Error thrown when compiling test cases");
+            }
+        } catch (Throwable ex) {
+            throw new AssertionError("Error thrown when compiling test cases");
+        }
+        check(classesDir,
+                "TestOneIgnorableChar.class",
+                "TestOneIgnorableChar$AABB.class",
+                "TestMultipleIgnorableChar.class",
+                "TestMultipleIgnorableChar$AABB.class");
+        if (errors > 0)
+            throw new AssertionError("There are some errors in the test check the error output");
+    }
+
+    /**
+     *  Check that a directory contains the expected files.
+     */
+    void check(File dir, String... paths) {
+        Set<String> found = new TreeSet<String>(Arrays.asList(dir.list()));
+        Set<String> expect = new TreeSet<String>(Arrays.asList(paths));
+        if (found.equals(expect))
+            return;
+        for (String f: found) {
+            if (!expect.contains(f))
+                error("Unexpected file found: " + f);
+        }
+        for (String e: expect) {
+            if (!found.contains(e))
+                error("Expected file not found: " + e);
+        }
+    }
+
+    int errors;
+
+    void error(String msg) {
+        System.err.println(msg);
+        errors++;
+    }
+
+    class JavaSource extends SimpleJavaFileObject {
+
+        String internalSource =
+            "public class #O {public class #I {} }";
+        public JavaSource(String outerClassName, String innerClassName) {
+            super(URI.create(outerClassName + ".java"), JavaFileObject.Kind.SOURCE);
+            internalSource =
+                    internalSource.replace("#O", outerClassName).replace("#I", innerClassName);
+        }
+
+        @Override
+        public CharSequence getCharContent(boolean ignoreEncodingErrors) {
+            return internalSource;
+        }
+    }
+}