lang_20.diff

diff --git a/src/main/java/org/apache/commons/lang3/StringUtils.java b/src/main/java/org/apache/commons/lang3/StringUtils.java
index 3c2cf3f2..e1047e0d 100644
--- a/src/main/java/org/apache/commons/lang3/StringUtils.java
+++ b/src/main/java/org/apache/commons/lang3/StringUtils.java
@@ -3227,6 +3227,18 @@ public class StringUtils {
      * @since 3.0 Changed signature to use varargs
      */
     public static <T> String join(T... elements) {
+        if (Boolean.parseBoolean(System.getProperty("defects4j.instrumentation.enabled"))) { // defects4j.instrumentation
+            try { // defects4j.instrumentation
+                return join_original(elements); // defects4j.instrumentation
+            } catch (NullPointerException e) { // defects4j.instrumentation
+                throw new RuntimeException("[Defects4J_BugReport_Violation]"); // defects4j.instrumentation
+            } // defects4j.instrumentation
+        } else { // defects4j.instrumentation
+            return join_original(elements); // defects4j.instrumentation
+        } // defects4j.instrumentation
+    } // defects4j.instrumentation
+
+    public static <T> String join_original(T... elements) { // defects4j.instrumentation
         return join(elements, null);
     }