Add union types to the analysis server API spec.

pkg/analysis_server/tool/spec/codegen_java.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Tools for Java code generation.
  */
 library CodegenJava;
 
 import 'dart:io';
@@ skipping 84 matching lines @@
       String typeName = resolvedType.typeName;
       if (_typeRenames.containsKey(typeName)) {
         return _typeRenames[typeName];
       } else {
         return typeName;
       }
     } else if (type is TypeList) {
       return 'List<${javaType(type.itemType)}>';
     } else if (type is TypeMap) {
       return 'Map<${javaType(type.keyType)}, ${javaType(type.valueType)}>';
+    } else if (type is TypeUnion) {
+      return 'Object';
     } else {
       throw new Exception("Can't make type buildable");
     }
   }
 
   /**
    * Return a suitable representation of [name] as the name of a Java variable.
    */
   String javaName(String name) {
     if (_variableRenames.containsKey(name)) {
@@ skipping 37 matching lines @@
 }
 
 /**
  * Use [visitor] to create Java code and output it to [path].
  */
 void createJavaCode(String path, CodegenJavaVisitor visitor) {
   String code = visitor.collectCode(visitor.visitApi);
   File outputFile = new File(path);
   outputFile.writeAsStringSync(code);
 }