diff --git a/lib/cocoa/src/TApplicationException.m b/lib/cocoa/src/TApplicationException.m
new file mode 100644
index 0000000..7068753
--- /dev/null
+++ b/lib/cocoa/src/TApplicationException.m
@@ -0,0 +1,130 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+
+#import "TApplicationException.h"
+#import "TProtocolUtil.h"
+
+@implementation TApplicationException
+
+- (id) initWithType: (int) type
+             reason: (NSString *) reason
+{
+  mType = type;
+
+  NSString * name;
+  switch (type) {
+  case TApplicationException_UNKNOWN_METHOD:
+    name = @"Unknown method";
+    break;
+  case TApplicationException_INVALID_MESSAGE_TYPE:
+    name = @"Invalid message type";
+    break;
+  case TApplicationException_WRONG_METHOD_NAME:
+    name = @"Wrong method name";
+    break;
+  case TApplicationException_BAD_SEQUENCE_ID:
+    name = @"Bad sequence ID";
+    break;
+  case TApplicationException_MISSING_RESULT:
+    name = @"Missing result";
+    break;
+  default:
+    name = @"Unknown";
+    break;
+  }
+
+  self = [super initWithName: name reason: reason userInfo: nil];
+  return self;
+}
+
+
++ (TApplicationException *) read: (id <TProtocol>) protocol
+{
+  NSString * reason = nil;
+  int type = TApplicationException_UNKNOWN;
+  int fieldType;
+  int fieldID;
+
+  [protocol readStructBeginReturningName: NULL];
+
+  while (true) {
+    [protocol readFieldBeginReturningName: NULL
+              type: &fieldType
+              fieldID: &fieldID];
+    if (fieldType == TType_STOP) {
+      break;
+    }
+    switch (fieldID) {
+    case 1:
+      if (fieldType == TType_STRING) {
+        reason = [protocol readString];
+      } else {
+        [TProtocolUtil skipType: fieldType onProtocol: protocol];
+      }
+      break;
+    case 2:
+      if (fieldType == TType_I32) {
+        type = [protocol readI32];
+      } else {
+        [TProtocolUtil skipType: fieldType onProtocol: protocol];
+      }
+      break;
+    default:
+      [TProtocolUtil skipType: fieldType onProtocol: protocol];
+      break;
+    }
+    [protocol readFieldEnd];
+  }
+  [protocol readStructEnd];
+
+  return [TApplicationException exceptionWithType: type reason: reason];
+}
+
+
+- (void) write: (id <TProtocol>) protocol
+{
+  [protocol writeStructBeginWithName: @"TApplicationException"];
+
+  if ([self reason] != nil) {
+    [protocol writeFieldBeginWithName: @"message"
+                 type: TType_STRING
+                 fieldID: 1];
+    [protocol writeString: [self reason]];
+    [protocol writeFieldEnd];
+  }
+
+  [protocol writeFieldBeginWithName: @"type"
+               type: TType_I32
+               fieldID: 2];
+  [protocol writeI32: mType];
+  [protocol writeFieldEnd];
+
+  [protocol writeFieldStop];
+  [protocol writeStructEnd];
+}
+
+
++ (TApplicationException *) exceptionWithType: (int) type
+                                      reason: (NSString *) reason
+{
+  return [[[TApplicationException alloc] initWithType: type
+                                         reason: reason] autorelease];
+}
+
+@end