diff --git a/classpath/java/lang/IllegalAccessError.java b/classpath/java/lang/IllegalAccessError.java
new file mode 100644
index 0000000000..4e0cf6e399
--- /dev/null
+++ b/classpath/java/lang/IllegalAccessError.java
@@ -0,0 +1,26 @@
+/* Copyright (c) 2010, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
+package java.lang;
+
+/**
+ * TODO : current Avian runtime doesn't check, need to be implemented.
+ * 
+ */
+public class IllegalAccessError extends IncompatibleClassChangeError {
+
+  public IllegalAccessError(String message) {
+    super(message);
+  }
+
+  public IllegalAccessError() {
+  }
+
+}
diff --git a/classpath/java/lang/InstantiationError.java b/classpath/java/lang/InstantiationError.java
new file mode 100644
index 0000000000..82cf51bc41
--- /dev/null
+++ b/classpath/java/lang/InstantiationError.java
@@ -0,0 +1,26 @@
+/* Copyright (c) 2010, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
+package java.lang;
+
+/**
+ * TODO : current Avian runtime doesn't check, need to be implemented.
+ *
+ */
+public class InstantiationError extends IncompatibleClassChangeError {
+
+  public InstantiationError(String message) {
+    super(message);
+  }
+
+  public InstantiationError() {
+  }
+
+}