diff --git a/test/921-hello-failure/src/CommonClassDefinition.java b/test/921-hello-failure/src/CommonClassDefinition.java
new file mode 100644
index 0000000..62602a0
--- /dev/null
+++ b/test/921-hello-failure/src/CommonClassDefinition.java
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+class CommonClassDefinition {
+  public final Class<?> target;
+  public final byte[] class_file_bytes;
+  public final byte[] dex_file_bytes;
+
+  CommonClassDefinition(Class<?> target, byte[] class_file_bytes, byte[] dex_file_bytes) {
+    this.target = target;
+    this.class_file_bytes = class_file_bytes;
+    this.dex_file_bytes = dex_file_bytes;
+  }
+}