@@ -0,0 +1,39 @@
+/*
+* Copyright 2020 Google LLC
+*
+* 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.
+*/
+
+package com.google.cloud.spanner;
+
+import com.google.cloud.spanner.SpannerException.ResourceNotFoundException;
+import com.google.rpc.ResourceInfo;
+import javax.annotation.Nullable;
+
+/**
+* Exception thrown by Cloud Spanner when an operation detects that the instance that is being used
+* no longer exists. This type of error has its own subclass as it is a condition that should cause
+* the client library to stop trying to send RPCs to the backend until the user has taken action.
+*/
+public class InstanceNotFoundException extends ResourceNotFoundException {
+private static final long serialVersionUID = 45297002L;
+
+/** Private constructor. Use {@link SpannerExceptionFactory} to create instances. */
+InstanceNotFoundException(
+DoNotConstructDirectly token,
+@Nullable String message,
+ResourceInfo resourceInfo,
+@Nullable Throwable cause) {
+super(token, message, resourceInfo, cause);
+}
+}

@@ -42,6 +42,8 @@ public final class SpannerExceptionFactory {
 static final String SESSION_RESOURCE_TYPE = "type.googleapis.com/google.spanner.v1.Session";
 static final String DATABASE_RESOURCE_TYPE =
 "type.googleapis.com/google.spanner.admin.database.v1.Database";
+static final String INSTANCE_RESOURCE_TYPE =
+"type.googleapis.com/google.spanner.admin.instance.v1.Instance";
 private static final Metadata.Key<ResourceInfo> KEY_RESOURCE_INFO =
 ProtoUtils.keyForProto(ResourceInfo.getDefaultInstance());
 
@@ -199,6 +201,8 @@ private static SpannerException newSpannerExceptionPreformatted(
 return new SessionNotFoundException(token, message, resourceInfo, cause);
 } else if (resourceInfo.getResourceType().equals(DATABASE_RESOURCE_TYPE)) {
 return new DatabaseNotFoundException(token, message, resourceInfo, cause);
+} else if (resourceInfo.getResourceType().equals(INSTANCE_RESOURCE_TYPE)) {
+return new InstanceNotFoundException(token, message, resourceInfo, cause);
 }
 }
 // Fall through to the default.