test/runtime/SharedArchiveFile/SharedStringsWb.java

*** 36,45 ****
--- 36,50 ----
  
          // The string below is known to be added to CDS archive
          String s = "<init>";
          String internedS = s.intern();
  
+         // Check that it's a valid string
+         if (s.getClass() != String.class || !(s instanceof String)) {
+             throw new RuntimeException("Shared string is not a valid String: FAIL");
+         }
+ 
          if (wb.isShared(internedS)) {
              System.out.println("Found shared string, result: PASS");
          } else {
              throw new RuntimeException("String is not shared, result: FAIL");
          }