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src/hotspot/share/oops/objArrayKlass.cpp

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rev 50519 : 8204943: Improve message of ArrayStoreException.

@@ -233,22 +233,38 @@
       ArrayAccess<ARRAYCOPY_DISJOINT>::oop_arraycopy(s, src_offset, d, dst_offset, length);
     } else {
       // slow case: need individual subtype checks
       // note: don't use obj_at_put below because it includes a redundant store check
       if (!ArrayAccess<ARRAYCOPY_DISJOINT | ARRAYCOPY_CHECKCAST>::oop_arraycopy(s, src_offset, d, dst_offset, length)) {
-        THROW(vmSymbols::java_lang_ArrayStoreException());
+        ResourceMark rm;
+        stringStream ss;
+        if (!bound->is_subtype_of(stype)) {
+          ss.print("arraycopy: type mismatch: can not copy %s[] into %s[]",
+                   stype->external_name(), bound->external_name());
+        } else {
+          // oop_arraycopy should return the index in the source array that
+          // contains the problematic oop.
+          ss.print("arraycopy: element type mismatch: can not cast one of the elements"
+                   " of %s[] to the type of the destination array, %s",
+                   stype->external_name(), bound->external_name());
+        }
+        THROW_MSG(vmSymbols::java_lang_ArrayStoreException(), ss.as_string());
       }
     }
   }
 }
 
 void ObjArrayKlass::copy_array(arrayOop s, int src_pos, arrayOop d,
                                int dst_pos, int length, TRAPS) {
   assert(s->is_objArray(), "must be obj array");
 
   if (!d->is_objArray()) {
-    THROW(vmSymbols::java_lang_ArrayStoreException());
+    ResourceMark rm;
+    stringStream ss;
+    ss.print("arraycopy: type mismatch: can not copy object[] into %s[]",
+             type2name_tab[ArrayKlass::cast(d->klass())->element_type()]);
+    THROW_MSG(vmSymbols::java_lang_ArrayStoreException(), ss.as_string());
   }
 
   // Check is all offsets and lengths are non negative
   if (src_pos < 0 || dst_pos < 0 || length < 0) {
     // Pass specific exception reason.
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