8024696: Missing null check in bound method reference capture

Reviewed-by: jjg, briangoetz

langtools/src/share/classes/com/sun/tools/javac/comp/LambdaToMethod.java

@@ -153,6 +153,8 @@ public class LambdaToMethod extends TreeTranslator {
         return instance;
     }
 
+    private Attr attr;
+
     private LambdaToMethod(Context context) {
         diags = JCDiagnostic.Factory.instance(context);
         log = Log.instance(context);
@@ -166,6 +168,7 @@ public class LambdaToMethod extends TreeTranslator {
         analyzer = new LambdaAnalyzerPreprocessor();
         Options options = Options.instance(context);
         dumpLambdaToMethodStats = options.isSet("dumpLambdaToMethodStats");
+        attr = Attr.instance(context);
     }
     // </editor-fold>
 
@@ -368,6 +371,7 @@ public class LambdaToMethod extends TreeTranslator {
 
             case BOUND:             /** Expr :: instMethod */
                 init = tree.getQualifierExpression();
+                init = attr.makeNullCheck(init);
                 break;
 
             case UNBOUND:           /** Type :: instMethod */

langtools/test/tools/javac/lambda/8023558/T8023558a.java

@@ -31,8 +31,14 @@ public class T8023558a {
         T get();
     }
 
+    static class K<T> implements SAM<T> {
+        public T get() {
+            return (T)this;
+        }
+    }
+
     public static void main(String[] args) {
-        SAM<SAM> sam = new SAM<SAM>() { public SAM get() { return null; } };
+        SAM<SAM> sam = new SAM<SAM>() { public SAM get() { return new K<>(); } };
         SAM temp = sam.get()::get;
     }
 }

langtools/test/tools/javac/lambda/methodReferenceExecution/MethodReferenceNullCheckTest.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * @test
+ * @bug 8024696
+ * @summary Missing null check in bound method reference capture
+ */
+
+import com.sun.tools.javac.util.Assert;
+import java.util.function.*;
+
+public class MethodReferenceNullCheckTest {
+    public static void main(String[] args) {
+        String s = null;
+        boolean npeFired = false;
+        try {
+            Supplier<Boolean> ss = s::isEmpty;
+        } catch (NullPointerException npe) {
+            npeFired = true;
+        } finally {
+            Assert.check(npeFired, "NPE should have been thrown");
+        }
+    }
+}