SONAR-9828 fix failure in CPD on Java 9

1 files changed, 10 insertions, 1 deletions

diff --git a/sonar-duplications/src/main/java/org/sonar/duplications/block/ByteArray.java b/sonar-duplications/src/main/java/org/sonar/duplications/block/ByteArray.java
index 6468157d28c..a52a4e4ca88 100644
--- a/sonar-duplications/src/main/java/org/sonar/duplications/block/ByteArray.java
+++ b/sonar-duplications/src/main/java/org/sonar/duplications/block/ByteArray.java
@@ -19,6 +19,7 @@
  */
 package org.sonar.duplications.block;
 
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.IntBuffer;
 import java.util.Arrays;
@@ -88,7 +89,15 @@ public final class ByteArray {
     int size = (bytes.length / 4) + (bytes.length % 4 == 0 ? 0 : 1);
     ByteBuffer bb = ByteBuffer.allocate(size * 4);
     bb.put(bytes);
-    bb.rewind();
+    // see https://github.com/mongodb/mongo-java-driver/commit/21c91bd364d38489e0bbe2e390efdb3746ee3fff
+    // The Java 9 ByteBuffer classes introduces overloaded methods with covariant return types for the following methods used by the driver:
+// Without casting, exceptions like this are thrown when executing on Java 8 and lower:
+
+   //  java.lang.NoSuchMethodError: java.nio.ByteBuffer.limit(I)Ljava/nio/ByteBuffer
+
+    //This is because the generated byte code includes the static return type of the method, which is not found on Java 8 and lower because
+    //the overloaded methods with covariant return types don't exist.
+    ((Buffer) bb).rewind();
     IntBuffer ib = bb.asIntBuffer();
     int[] result = new int[size];
     ib.get(result);