Throw ReflectionStrippedError when getDeclaredField is called on a cl…

…ass without metadata.

	Change on 2016/04/22 by ashersb <ashersb@google.com>

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=120565898

jre_emul/Classes/IOSClass.m

@@ -37,6 +37,7 @@
 #import "NSNumber+JavaNumber.h"
 #import "NSObject+JavaObject.h"
 #import "NSString+JavaString.h"
+#import "com/google/j2objc/ReflectionStrippedError.h"
 #import "java/lang/AssertionError.h"
 #import "java/lang/ClassCastException.h"
 #import "java/lang/ClassLoader.h"
@@ -939,10 +940,7 @@ Ivar FindIvar(IOSClass *cls, NSString *name) {
                                       withMetadata:fieldMeta];
       }
     } else {
-      Ivar ivar = FindIvar(iosClass, name);
-      if (ivar) {
-        return [JavaLangReflectField fieldWithIvar:ivar withClass:iosClass withMetadata:nil];
-      }
+      @throw create_ComGoogleJ2objcReflectionStrippedError_init();
     }
   }
   return nil;

jre_emul/Classes/com/google/j2objc/ReflectionStrippedError.java

@@ -0,0 +1,37 @@
+/*
+ *  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.
+ */
+
+package com.google.j2objc;
+
+/**
+ * Thrown when a reflection API is used but reflection was disabled during translation.
+ */
+public class ReflectionStrippedError extends Error {
+
+  private static final String EXCEPTION_MESSAGE =
+      "Reflection is unavailable. Fix this by avoiding reflection or building without"
+          + " --strip-reflection.";
+
+  private static final long serialVersionUID = 1896945698960498962L;
+
+  /**
+   * Create a new ReflectionStrippedError.
+   */
+  public ReflectionStrippedError() {
+    super(EXCEPTION_MESSAGE);
+  }
+}

jre_emul/java_sources.mk

@@ -350,6 +350,7 @@ JAVA_PUBLIC_SOURCES_CORE = \
   sun/misc/Unsafe.java
 
 JAVA_PRIVATE_SOURCES_CORE = \
+  com/google/j2objc/ReflectionStrippedError.java \
   com/google/j2objc/LibraryNotLinkedError.java \
   com/google/j2objc/util/ScopedLocalRef.java \
   dalvik/system/BlockGuard.java \