diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/ConverterUtils.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/ConverterUtils.java
index e9674cfc147..acd29fb02d6 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/ConverterUtils.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/ConverterUtils.java
@@ -122,8 +122,20 @@ public class ConverterUtils {
   public static ApplicationId toApplicationId(RecordFactory recordFactory,
       String appIdStr) {
     Iterator<String> it = _split(appIdStr).iterator();
-    it.next(); // prefix. TODO: Validate application prefix
-    return toApplicationId(recordFactory, it);
+    if (!it.next().equals(APPLICATION_PREFIX)) {
+      throw new IllegalArgumentException("Invalid ApplicationId prefix: "
+          + appIdStr + ". The valid ApplicationId should start with prefix "
+          + APPLICATION_PREFIX);
+    }
+    try {
+      return toApplicationId(recordFactory, it);
+    } catch (NumberFormatException n) {
+      throw new IllegalArgumentException("Invalid ApplicationId: " + appIdStr,
+          n);
+    } catch (NoSuchElementException e) {
+      throw new IllegalArgumentException("Invalid ApplicationId: " + appIdStr,
+          e);
+    }
   }
 
   private static ApplicationId toApplicationId(RecordFactory recordFactory,
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/util/WebAppUtils.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/util/WebAppUtils.java
index f8e67ee1fb3..faf4a774447 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/util/WebAppUtils.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/util/WebAppUtils.java
@@ -33,9 +33,14 @@ import org.apache.hadoop.http.HttpConfig.Policy;
 import org.apache.hadoop.http.HttpServer2;
 import org.apache.hadoop.net.NetUtils;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.conf.HAUtil;
 import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
+import org.apache.hadoop.yarn.factories.RecordFactory;
+import org.apache.hadoop.yarn.util.ConverterUtils;
 import org.apache.hadoop.yarn.util.RMHAUtils;
+import org.apache.hadoop.yarn.webapp.BadRequestException;
+import org.apache.hadoop.yarn.webapp.NotFoundException;
 
 @Private
 @Evolving
@@ -378,4 +383,21 @@ public class WebAppUtils {
     }
     return password;
   }
+
+  public static ApplicationId parseApplicationId(RecordFactory recordFactory,
+      String appId) {
+    if (appId == null || appId.isEmpty()) {
+      throw new NotFoundException("appId, " + appId + ", is empty or null");
+    }
+    ApplicationId aid = null;
+    try {
+      aid = ConverterUtils.toApplicationId(recordFactory, appId);
+    } catch (Exception e) {
+      throw new BadRequestException(e);
+    }
+    if (aid == null) {
+      throw new NotFoundException("app with id " + appId + " not found");
+    }
+    return aid;
+  }
 }
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/webapp/WebServices.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/webapp/WebServices.java
index 40e40c98421..19ea30136e8 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/webapp/WebServices.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/webapp/WebServices.java
@@ -429,7 +429,12 @@ public class WebServices {
     if (appId == null || appId.isEmpty()) {
       throw new NotFoundException("appId, " + appId + ", is empty or null");
     }
-    ApplicationId aid = ConverterUtils.toApplicationId(appId);
+    ApplicationId aid = null;
+    try {
+      aid = ConverterUtils.toApplicationId(appId);
+    } catch (Exception e) {
+      throw new BadRequestException(e);
+    }
     if (aid == null) {
       throw new NotFoundException("appId is null");
     }
@@ -442,8 +447,12 @@ public class WebServices {
       throw new NotFoundException("appAttemptId, " + appAttemptId
           + ", is empty or null");
     }
-    ApplicationAttemptId aaid =
-        ConverterUtils.toApplicationAttemptId(appAttemptId);
+    ApplicationAttemptId aaid = null;
+    try {
+      aaid = ConverterUtils.toApplicationAttemptId(appAttemptId);
+    } catch (Exception e) {
+      throw new BadRequestException(e);
+    }
     if (aaid == null) {
       throw new NotFoundException("appAttemptId is null");
     }
@@ -455,7 +464,12 @@ public class WebServices {
       throw new NotFoundException("containerId, " + containerId
           + ", is empty or null");
     }
-    ContainerId cid = ConverterUtils.toContainerId(containerId);
+    ContainerId cid = null;
+    try {
+      cid = ConverterUtils.toContainerId(containerId);
+    } catch (Exception e) {
+      throw new BadRequestException(e);
+    }
     if (cid == null) {
       throw new NotFoundException("containerId is null");
     }
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/webapp/NMWebServices.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/webapp/NMWebServices.java
index de6d219deaa..fddeb042e5f 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/webapp/NMWebServices.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/webapp/NMWebServices.java
@@ -58,6 +58,7 @@ import org.apache.hadoop.yarn.util.ConverterUtils;
 import org.apache.hadoop.yarn.webapp.BadRequestException;
 import org.apache.hadoop.yarn.webapp.NotFoundException;
 import org.apache.hadoop.yarn.webapp.WebApp;
+import org.apache.hadoop.yarn.webapp.util.WebAppUtils;
 
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
@@ -143,10 +144,7 @@ public class NMWebServices {
   @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
   public AppInfo getNodeApp(@PathParam("appid") String appId) {
     init();
-    ApplicationId id = ConverterUtils.toApplicationId(recordFactory, appId);
-    if (id == null) {
-      throw new NotFoundException("app with id " + appId + " not found");
-    }
+    ApplicationId id = WebAppUtils.parseApplicationId(recordFactory, appId);
     Application app = this.nmContext.getApplications().get(id);
     if (app == null) {
       throw new NotFoundException("app with id " + appId + " not found");
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/webapp/TestNMWebServicesApps.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/webapp/TestNMWebServicesApps.java
index e274abb2aac..3cd8faf0389 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/webapp/TestNMWebServicesApps.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/webapp/TestNMWebServicesApps.java
@@ -565,11 +565,14 @@ public class TestNMWebServicesApps extends JerseyTestBase {
       String type = exception.getString("exception");
       String classname = exception.getString("javaClassName");
       WebServicesTestUtils.checkStringMatch("exception message",
-          "For input string: \"foo\"", message);
+          "java.lang.IllegalArgumentException: Invalid ApplicationId prefix: "
+              + "app_foo_0000. The valid ApplicationId should start with prefix"
+              + " application",
+          message);
       WebServicesTestUtils.checkStringMatch("exception type",
-          "NumberFormatException", type);
+          "BadRequestException", type);
       WebServicesTestUtils.checkStringMatch("exception classname",
-          "java.lang.NumberFormatException", classname);
+          "org.apache.hadoop.yarn.webapp.BadRequestException", classname);
     }
   }
 
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMWebServices.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMWebServices.java
index 0ed8a4ed00f..8036af42f05 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMWebServices.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMWebServices.java
@@ -662,14 +662,7 @@ public class RMWebServices extends WebServices {
   public AppInfo getApp(@Context HttpServletRequest hsr,
       @PathParam("appid") String appId) {
     init();
-    if (appId == null || appId.isEmpty()) {
-      throw new NotFoundException("appId, " + appId + ", is empty or null");
-    }
-    ApplicationId id;
-    id = ConverterUtils.toApplicationId(recordFactory, appId);
-    if (id == null) {
-      throw new NotFoundException("appId is null");
-    }
+    ApplicationId id = WebAppUtils.parseApplicationId(recordFactory, appId);
     RMApp app = rm.getRMContext().getRMApps().get(id);
     if (app == null) {
       throw new NotFoundException("app with id: " + appId + " not found");
@@ -684,14 +677,7 @@ public class RMWebServices extends WebServices {
       @PathParam("appid") String appId) {
 
     init();
-    if (appId == null || appId.isEmpty()) {
-      throw new NotFoundException("appId, " + appId + ", is empty or null");
-    }
-    ApplicationId id;
-    id = ConverterUtils.toApplicationId(recordFactory, appId);
-    if (id == null) {
-      throw new NotFoundException("appId is null");
-    }
+    ApplicationId id = WebAppUtils.parseApplicationId(recordFactory, appId);
     RMApp app = rm.getRMContext().getRMApps().get(id);
     if (app == null) {
       throw new NotFoundException("app with id: " + appId + " not found");
@@ -1303,19 +1289,7 @@ public class RMWebServices extends WebServices {
   }
 
   private RMApp getRMAppForAppId(String appId) {
-
-    if (appId == null || appId.isEmpty()) {
-      throw new NotFoundException("appId, " + appId + ", is empty or null");
-    }
-    ApplicationId id;
-    try {
-      id = ConverterUtils.toApplicationId(recordFactory, appId);
-    } catch (NumberFormatException e) {
-      throw new NotFoundException("appId is invalid");
-    }
-    if (id == null) {
-      throw new NotFoundException("appId is invalid");
-    }
+    ApplicationId id = WebAppUtils.parseApplicationId(recordFactory, appId);
     RMApp app = rm.getRMContext().getRMApps().get(id);
     if (app == null) {
       throw new NotFoundException("app with id: " + appId + " not found");
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesApps.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesApps.java
index 0328a7a291b..72cccf66420 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesApps.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesApps.java
@@ -1194,11 +1194,13 @@ public class TestRMWebServicesApps extends JerseyTestBase {
       String type = exception.getString("exception");
       String classname = exception.getString("javaClassName");
       WebServicesTestUtils.checkStringMatch("exception message",
-          "For input string: \"invalid\"", message);
+          "java.lang.IllegalArgumentException: Invalid ApplicationId:"
+              + " application_invalid_12",
+          message);
       WebServicesTestUtils.checkStringMatch("exception type",
-          "NumberFormatException", type);
+          "BadRequestException", type);
       WebServicesTestUtils.checkStringMatch("exception classname",
-          "java.lang.NumberFormatException", classname);
+          "org.apache.hadoop.yarn.webapp.BadRequestException", classname);
 
     } finally {
       rm.stop();
@@ -1500,15 +1502,17 @@ public class TestRMWebServicesApps extends JerseyTestBase {
   public void testInvalidAppAttempts() throws JSONException, Exception {
     rm.start();
     MockNM amNodeManager = rm.registerNode("127.0.0.1:1234", 2048);
-    rm.submitApp(CONTAINER_MB);
+    RMApp app = rm.submitApp(CONTAINER_MB);
     amNodeManager.nodeHeartbeat(true);
     WebResource r = resource();
 
     try {
       r.path("ws").path("v1").path("cluster").path("apps")
-          .path("application_invalid_12").accept(MediaType.APPLICATION_JSON)
+          .path(app.getApplicationId().toString()).path("appattempts")
+          .path("appattempt_invalid_12_000001")
+          .accept(MediaType.APPLICATION_JSON)
           .get(JSONObject.class);
-      fail("should have thrown exception on invalid appid");
+      fail("should have thrown exception on invalid appAttempt");
     } catch (UniformInterfaceException ue) {
       ClientResponse response = ue.getResponse();
 
@@ -1521,11 +1525,13 @@ public class TestRMWebServicesApps extends JerseyTestBase {
       String type = exception.getString("exception");
       String classname = exception.getString("javaClassName");
       WebServicesTestUtils.checkStringMatch("exception message",
-          "For input string: \"invalid\"", message);
+          "java.lang.IllegalArgumentException: Invalid AppAttemptId:"
+              + " appattempt_invalid_12_000001",
+          message);
       WebServicesTestUtils.checkStringMatch("exception type",
-          "NumberFormatException", type);
+          "BadRequestException", type);
       WebServicesTestUtils.checkStringMatch("exception classname",
-          "java.lang.NumberFormatException", classname);
+          "org.apache.hadoop.yarn.webapp.BadRequestException", classname);
 
     } finally {
       rm.stop();
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesAppsModification.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesAppsModification.java
index 9abcf9c8d5b..38b32e96e17 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesAppsModification.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServicesAppsModification.java
@@ -568,17 +568,21 @@ public class TestRMWebServicesAppsModification extends JerseyTestBase {
     MockNM amNodeManager = rm.registerNode("127.0.0.1:1234", 2048);
     amNodeManager.nodeHeartbeat(true);
     String[] testAppIds = { "application_1391705042196_0001", "random_string" };
-    for (String testAppId : testAppIds) {
+    for (int i = 0; i < testAppIds.length; i++) {
       AppState info = new AppState("KILLED");
       ClientResponse response =
-          this.constructWebResource("apps", testAppId, "state")
+          this.constructWebResource("apps", testAppIds[i], "state")
             .accept(MediaType.APPLICATION_XML)
             .entity(info, MediaType.APPLICATION_XML).put(ClientResponse.class);
       if (!isAuthenticationEnabled()) {
         assertEquals(Status.UNAUTHORIZED, response.getClientResponseStatus());
         continue;
       }
-      assertEquals(Status.NOT_FOUND, response.getClientResponseStatus());
+      if (i == 0) {
+        assertEquals(Status.NOT_FOUND, response.getClientResponseStatus());
+      } else {
+        assertEquals(Status.BAD_REQUEST, response.getClientResponseStatus());
+      }
     }
     rm.stop();
   }