Vector of unions support for java and c# (#4735)

* Eclipse ignore

* TypeScript support

* Prefixing enums

* Test results

* Merged JS and TS generators

* Fixed AppVeyor build problems

* Fixed more AppVeyor build problems

* Fixed more AppVeyor build problems

* Changed TS flag to options struct

* Storing options by value

* Removed unneeded const

* Re-export support for unions

* Uint support

* Casting bools to numbers for mutation

* TS shell tests

* Reverted generates js test file to original version

* Backing up js tests and properly generating test data

* Not importing flatbuffers for TS test generation

* Not overwriting generated js for tests

* AppVeyor test fixes

* Generating the most strict TS code possible

* Not returning null when creating vectors

* Not returning null from struct contructors

* Vector of unions for ts/js

* Sanity check for languages

* Indentation fix + output test files

* Vectors of unions for php

* Fixes to union vector handling + tests

* Fix for strictPropertyInitialization

* Fix for new aligned operator new for gcc >= 7.1

* Not generating imports/ns prefixes with --gen-all

* TypeScript docs

* Missing imports of enums

* Missing TS links

* Enabled vector of unions for java, since it seems to work

* Added jitpack config

* Added obj to vector of unions getter

* Removed unneeded accessor

* Bumped jdk version in pom.xml

* Vector of unions support for c#

14 files changed, 322 insertions, 8 deletions

diff --git a/pom.xml b/pom.xml
index f4dcc016..b7f1a796 100644
--- a/pom.xml
+++ b/pom.xml
@@ -47,8 +47,8 @@
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
         <configuration>
-          <source>1.6</source>
-          <target>1.6</target>
+          <source>1.8</source>
+          <target>1.8</target>
         </configuration>
         <version>3.2</version>
       </plugin>
diff --git a/src/idl_gen_general.cpp b/src/idl_gen_general.cpp
index f9fe6cfc..d3cc79b2 100644
--- a/src/idl_gen_general.cpp
+++ b/src/idl_gen_general.cpp
@@ -853,7 +853,8 @@ class GeneralGenerator : public BaseGenerator {
           (field.value.type.base_type == BASE_TYPE_STRUCT ||
            field.value.type.base_type == BASE_TYPE_UNION ||
            (field.value.type.base_type == BASE_TYPE_VECTOR &&
-            field.value.type.element == BASE_TYPE_STRUCT))) {
+            (field.value.type.element == BASE_TYPE_STRUCT ||
+             field.value.type.element == BASE_TYPE_UNION)))) {
         optional = lang_.optional_suffix;
         conditional_cast = "(" + type_name_dest + optional + ")";
       }
@@ -891,7 +892,9 @@ class GeneralGenerator : public BaseGenerator {
           code += MakeCamel(field.name, lang_.first_camel_upper);
           code += "(new " + type_name + "(), j); }\n";
         }
-      } else if (field.value.type.base_type == BASE_TYPE_UNION) {
+      } else if (field.value.type.base_type == BASE_TYPE_UNION ||
+          (field.value.type.base_type == BASE_TYPE_VECTOR &&
+           field.value.type.VectorType().base_type == BASE_TYPE_UNION)) {
         if (lang_.language == IDLOptions::kCSharp) {
           // Union types in C# use generic Table-derived type for better type
           // safety.
@@ -963,13 +966,30 @@ class GeneralGenerator : public BaseGenerator {
             break;
           case BASE_TYPE_VECTOR: {
             auto vectortype = field.value.type.VectorType();
+            if (vectortype.base_type == BASE_TYPE_UNION &&
+                lang_.language == IDLOptions::kCSharp) {
+                  conditional_cast = "(TTable?)";
+                  getter += "<TTable>";
+            }
             code += "(";
             if (vectortype.base_type == BASE_TYPE_STRUCT) {
               if (lang_.language != IDLOptions::kCSharp)
                 code += type_name + " obj, ";
               getter = obj + ".__assign";
+            } else if (vectortype.base_type == BASE_TYPE_UNION) {
+              if (lang_.language != IDLOptions::kCSharp)
+                code += type_name + " obj, ";
+            }
+            code += "int j)";
+            const auto body = offset_prefix + conditional_cast + getter + "(";
+            if (vectortype.base_type == BASE_TYPE_UNION) {
+              if (lang_.language != IDLOptions::kCSharp)
+                code += body + "obj, ";
+              else
+                code += " where TTable : struct, IFlatbufferObject" + body;
+            } else {
+              code += body;
             }
-            code += "int j)" + offset_prefix + conditional_cast + getter + "(";
             auto index = lang_.accessor_prefix + "__vector(o) + j * " +
                          NumToString(InlineSize(vectortype));
             if (vectortype.base_type == BASE_TYPE_STRUCT) {
diff --git a/src/idl_parser.cpp b/src/idl_parser.cpp
index 263c89b9..d41ad00d 100644
--- a/src/idl_parser.cpp
+++ b/src/idl_parser.cpp
@@ -1623,7 +1623,8 @@ CheckedError Parser::CheckClash(std::vector<FieldDef *> &fields,
 bool Parser::SupportsVectorOfUnions() const {
   return opts.lang_to_generate != 0 &&
          (opts.lang_to_generate & ~(IDLOptions::kCpp | IDLOptions::kJs |
-                                    IDLOptions::kTs | IDLOptions::kPhp)) == 0;
+                                    IDLOptions::kTs | IDLOptions::kPhp |
+                                    IDLOptions::kJava | IDLOptions::kCSharp)) == 0;
 }
 
 Namespace *Parser::UniqueNamespace(Namespace *ns) {
diff --git a/tests/FlatBuffers.Test/NetTest.sh b/tests/FlatBuffers.Test/NetTest.sh
index 6201549c..3822b493 100644
--- a/tests/FlatBuffers.Test/NetTest.sh
+++ b/tests/FlatBuffers.Test/NetTest.sh
@@ -3,7 +3,7 @@
 # Testing C# on Linux using Mono.
 
 mcs -debug -out:./fbnettest.exe \
-  ../../net/FlatBuffers/*.cs ../MyGame/Example/*.cs ../MyGame/*.cs \
+  ../../net/FlatBuffers/*.cs ../MyGame/Example/*.cs ../MyGame/*.cs ../union_vector/*.cs \
   FlatBuffersTestClassAttribute.cs FlatBuffersTestMethodAttribute.cs Assert.cs FlatBuffersExampleTests.cs Program.cs ByteBufferTests.cs FlatBufferBuilderTests.cs FlatBuffersFuzzTests.cs FuzzTestData.cs Lcg.cs TestTable.cs
 mono --debug ./fbnettest.exe
 rm fbnettest.exe
@@ -14,7 +14,7 @@ rm Resources/monsterdata_cstest_sp.mon
 
 mcs -debug -out:./fbnettest.exe \
   -unsafe -d:UNSAFE_BYTEBUFFER \
-  ../../net/FlatBuffers/*.cs ../MyGame/Example/*.cs ../MyGame/*.cs \
+  ../../net/FlatBuffers/*.cs ../MyGame/Example/*.cs ../MyGame/*.cs ../union_vector/*.cs\
   FlatBuffersTestClassAttribute.cs FlatBuffersTestMethodAttribute.cs Assert.cs FlatBuffersExampleTests.cs Program.cs ByteBufferTests.cs FlatBufferBuilderTests.cs FlatBuffersFuzzTests.cs FuzzTestData.cs Lcg.cs TestTable.cs
 mono --debug ./fbnettest.exe
 rm fbnettest.exe
diff --git a/tests/union_vector/Attacker.cs b/tests/union_vector/Attacker.cs
new file mode 100644
index 00000000..c81e8d59
--- /dev/null
+++ b/tests/union_vector/Attacker.cs
@@ -0,0 +1,33 @@
+// <auto-generated>
+//  automatically generated by the FlatBuffers compiler, do not modify
+// </auto-generated>
+
+using global::System;
+using global::FlatBuffers;
+
+public struct Attacker : IFlatbufferObject
+{
+  private Table __p;
+  public ByteBuffer ByteBuffer { get { return __p.bb; } }
+  public static Attacker GetRootAsAttacker(ByteBuffer _bb) { return GetRootAsAttacker(_bb, new Attacker()); }
+  public static Attacker GetRootAsAttacker(ByteBuffer _bb, Attacker obj) { return (obj.__assign(_bb.GetInt(_bb.Position) + _bb.Position, _bb)); }
+  public void __init(int _i, ByteBuffer _bb) { __p.bb_pos = _i; __p.bb = _bb; }
+  public Attacker __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public int SwordAttackDamage { get { int o = __p.__offset(4); return o != 0 ? __p.bb.GetInt(o + __p.bb_pos) : (int)0; } }
+
+  public static Offset<Attacker> CreateAttacker(FlatBufferBuilder builder,
+      int sword_attack_damage = 0) {
+    builder.StartObject(1);
+    Attacker.AddSwordAttackDamage(builder, sword_attack_damage);
+    return Attacker.EndAttacker(builder);
+  }
+
+  public static void StartAttacker(FlatBufferBuilder builder) { builder.StartObject(1); }
+  public static void AddSwordAttackDamage(FlatBufferBuilder builder, int swordAttackDamage) { builder.AddInt(0, swordAttackDamage, 0); }
+  public static Offset<Attacker> EndAttacker(FlatBufferBuilder builder) {
+    int o = builder.EndObject();
+    return new Offset<Attacker>(o);
+  }
+};
+
diff --git a/tests/union_vector/Attacker.java b/tests/union_vector/Attacker.java
new file mode 100644
index 00000000..d9a9bf32
--- /dev/null
+++ b/tests/union_vector/Attacker.java
@@ -0,0 +1,31 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+import java.nio.*;
+import java.lang.*;
+import java.util.*;
+import com.google.flatbuffers.*;
+
+@SuppressWarnings("unused")
+public final class Attacker extends Table {
+  public static Attacker getRootAsAttacker(ByteBuffer _bb) { return getRootAsAttacker(_bb, new Attacker()); }
+  public static Attacker getRootAsAttacker(ByteBuffer _bb, Attacker obj) { _bb.order(ByteOrder.LITTLE_ENDIAN); return (obj.__assign(_bb.getInt(_bb.position()) + _bb.position(), _bb)); }
+  public void __init(int _i, ByteBuffer _bb) { bb_pos = _i; bb = _bb; }
+  public Attacker __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public int swordAttackDamage() { int o = __offset(4); return o != 0 ? bb.getInt(o + bb_pos) : 0; }
+
+  public static int createAttacker(FlatBufferBuilder builder,
+      int sword_attack_damage) {
+    builder.startObject(1);
+    Attacker.addSwordAttackDamage(builder, sword_attack_damage);
+    return Attacker.endAttacker(builder);
+  }
+
+  public static void startAttacker(FlatBufferBuilder builder) { builder.startObject(1); }
+  public static void addSwordAttackDamage(FlatBufferBuilder builder, int swordAttackDamage) { builder.addInt(0, swordAttackDamage, 0); }
+  public static int endAttacker(FlatBufferBuilder builder) {
+    int o = builder.endObject();
+    return o;
+  }
+}
+
diff --git a/tests/union_vector/BookReader.cs b/tests/union_vector/BookReader.cs
new file mode 100644
index 00000000..1642b81f
--- /dev/null
+++ b/tests/union_vector/BookReader.cs
@@ -0,0 +1,23 @@
+// <auto-generated>
+//  automatically generated by the FlatBuffers compiler, do not modify
+// </auto-generated>
+
+using global::System;
+using global::FlatBuffers;
+
+public struct BookReader : IFlatbufferObject
+{
+  private Struct __p;
+  public ByteBuffer ByteBuffer { get { return __p.bb; } }
+  public void __init(int _i, ByteBuffer _bb) { __p.bb_pos = _i; __p.bb = _bb; }
+  public BookReader __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public int BooksRead { get { return __p.bb.GetInt(__p.bb_pos + 0); } }
+
+  public static Offset<BookReader> CreateBookReader(FlatBufferBuilder builder, int BooksRead) {
+    builder.Prep(4, 4);
+    builder.PutInt(BooksRead);
+    return new Offset<BookReader>(builder.Offset);
+  }
+};
+
diff --git a/tests/union_vector/BookReader.java b/tests/union_vector/BookReader.java
new file mode 100644
index 00000000..e23f82c1
--- /dev/null
+++ b/tests/union_vector/BookReader.java
@@ -0,0 +1,21 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+import java.nio.*;
+import java.lang.*;
+import java.util.*;
+import com.google.flatbuffers.*;
+
+@SuppressWarnings("unused")
+public final class BookReader extends Struct {
+  public void __init(int _i, ByteBuffer _bb) { bb_pos = _i; bb = _bb; }
+  public BookReader __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public int booksRead() { return bb.getInt(bb_pos + 0); }
+
+  public static int createBookReader(FlatBufferBuilder builder, int booksRead) {
+    builder.prep(4, 4);
+    builder.putInt(booksRead);
+    return builder.offset();
+  }
+}
+
diff --git a/tests/union_vector/Character.cs b/tests/union_vector/Character.cs
new file mode 100644
index 00000000..b873b73d
--- /dev/null
+++ b/tests/union_vector/Character.cs
@@ -0,0 +1,15 @@
+// <auto-generated>
+//  automatically generated by the FlatBuffers compiler, do not modify
+// </auto-generated>
+
+public enum Character : byte
+{
+ NONE = 0,
+ MuLan = 1,
+ Rapunzel = 2,
+ Belle = 3,
+ BookFan = 4,
+ Other = 5,
+ Unused = 6,
+};
+
diff --git a/tests/union_vector/Character.java b/tests/union_vector/Character.java
new file mode 100644
index 00000000..5d6c5b7b
--- /dev/null
+++ b/tests/union_vector/Character.java
@@ -0,0 +1,17 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+public final class Character {
+  private Character() { }
+  public static final byte NONE = 0;
+  public static final byte MuLan = 1;
+  public static final byte Rapunzel = 2;
+  public static final byte Belle = 3;
+  public static final byte BookFan = 4;
+  public static final byte Other = 5;
+  public static final byte Unused = 6;
+
+  public static final String[] names = { "NONE", "MuLan", "Rapunzel", "Belle", "BookFan", "Other", "Unused", };
+
+  public static String name(int e) { return names[e]; }
+}
+
diff --git a/tests/union_vector/Movie.cs b/tests/union_vector/Movie.cs
new file mode 100644
index 00000000..30954aa0
--- /dev/null
+++ b/tests/union_vector/Movie.cs
@@ -0,0 +1,55 @@
+// <auto-generated>
+//  automatically generated by the FlatBuffers compiler, do not modify
+// </auto-generated>
+
+using global::System;
+using global::FlatBuffers;
+
+public struct Movie : IFlatbufferObject
+{
+  private Table __p;
+  public ByteBuffer ByteBuffer { get { return __p.bb; } }
+  public static Movie GetRootAsMovie(ByteBuffer _bb) { return GetRootAsMovie(_bb, new Movie()); }
+  public static Movie GetRootAsMovie(ByteBuffer _bb, Movie obj) { return (obj.__assign(_bb.GetInt(_bb.Position) + _bb.Position, _bb)); }
+  public static bool MovieBufferHasIdentifier(ByteBuffer _bb) { return Table.__has_identifier(_bb, "MOVI"); }
+  public void __init(int _i, ByteBuffer _bb) { __p.bb_pos = _i; __p.bb = _bb; }
+  public Movie __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public Character MainCharacterType { get { int o = __p.__offset(4); return o != 0 ? (Character)__p.bb.Get(o + __p.bb_pos) : Character.NONE; } }
+  public TTable? MainCharacter<TTable>() where TTable : struct, IFlatbufferObject { int o = __p.__offset(6); return o != 0 ? (TTable?)__p.__union<TTable>(o) : null; }
+  public Character CharactersType(int j) { int o = __p.__offset(8); return o != 0 ? (Character)__p.bb.Get(__p.__vector(o) + j * 1) : (Character)0; }
+  public int CharactersTypeLength { get { int o = __p.__offset(8); return o != 0 ? __p.__vector_len(o) : 0; } }
+  public ArraySegment<byte>? GetCharactersTypeBytes() { return __p.__vector_as_arraysegment(8); }
+  public TTable? Characters<TTable>(int j) where TTable : struct, IFlatbufferObject { int o = __p.__offset(10); return o != 0 ? (TTable?)__p.__union<TTable>(__p.__vector(o) + j * 4) : null; }
+  public int CharactersLength { get { int o = __p.__offset(10); return o != 0 ? __p.__vector_len(o) : 0; } }
+
+  public static Offset<Movie> CreateMovie(FlatBufferBuilder builder,
+      Character main_character_type = Character.NONE,
+      int main_characterOffset = 0,
+      VectorOffset characters_typeOffset = default(VectorOffset),
+      VectorOffset charactersOffset = default(VectorOffset)) {
+    builder.StartObject(4);
+    Movie.AddCharacters(builder, charactersOffset);
+    Movie.AddCharactersType(builder, characters_typeOffset);
+    Movie.AddMainCharacter(builder, main_characterOffset);
+    Movie.AddMainCharacterType(builder, main_character_type);
+    return Movie.EndMovie(builder);
+  }
+
+  public static void StartMovie(FlatBufferBuilder builder) { builder.StartObject(4); }
+  public static void AddMainCharacterType(FlatBufferBuilder builder, Character mainCharacterType) { builder.AddByte(0, (byte)mainCharacterType, 0); }
+  public static void AddMainCharacter(FlatBufferBuilder builder, int mainCharacterOffset) { builder.AddOffset(1, mainCharacterOffset, 0); }
+  public static void AddCharactersType(FlatBufferBuilder builder, VectorOffset charactersTypeOffset) { builder.AddOffset(2, charactersTypeOffset.Value, 0); }
+  public static VectorOffset CreateCharactersTypeVector(FlatBufferBuilder builder, Character[] data) { builder.StartVector(1, data.Length, 1); for (int i = data.Length - 1; i >= 0; i--) builder.AddByte((byte)data[i]); return builder.EndVector(); }
+  public static void StartCharactersTypeVector(FlatBufferBuilder builder, int numElems) { builder.StartVector(1, numElems, 1); }
+  public static void AddCharacters(FlatBufferBuilder builder, VectorOffset charactersOffset) { builder.AddOffset(3, charactersOffset.Value, 0); }
+  public static VectorOffset CreateCharactersVector(FlatBufferBuilder builder, int[] data) { builder.StartVector(4, data.Length, 4); for (int i = data.Length - 1; i >= 0; i--) builder.AddOffset(data[i]); return builder.EndVector(); }
+  public static void StartCharactersVector(FlatBufferBuilder builder, int numElems) { builder.StartVector(4, numElems, 4); }
+  public static Offset<Movie> EndMovie(FlatBufferBuilder builder) {
+    int o = builder.EndObject();
+    return new Offset<Movie>(o);
+  }
+  public static void FinishMovieBuffer(FlatBufferBuilder builder, Offset<Movie> offset) { builder.Finish(offset.Value, "MOVI"); }
+  public static void FinishSizePrefixedMovieBuffer(FlatBufferBuilder builder, Offset<Movie> offset) { builder.FinishSizePrefixed(offset.Value, "MOVI"); }
+};
+
diff --git a/tests/union_vector/Movie.java b/tests/union_vector/Movie.java
new file mode 100644
index 00000000..8e214b93
--- /dev/null
+++ b/tests/union_vector/Movie.java
@@ -0,0 +1,54 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+import java.nio.*;
+import java.lang.*;
+import java.util.*;
+import com.google.flatbuffers.*;
+
+@SuppressWarnings("unused")
+public final class Movie extends Table {
+  public static Movie getRootAsMovie(ByteBuffer _bb) { return getRootAsMovie(_bb, new Movie()); }
+  public static Movie getRootAsMovie(ByteBuffer _bb, Movie obj) { _bb.order(ByteOrder.LITTLE_ENDIAN); return (obj.__assign(_bb.getInt(_bb.position()) + _bb.position(), _bb)); }
+  public static boolean MovieBufferHasIdentifier(ByteBuffer _bb) { return __has_identifier(_bb, "MOVI"); }
+  public void __init(int _i, ByteBuffer _bb) { bb_pos = _i; bb = _bb; }
+  public Movie __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public byte mainCharacterType() { int o = __offset(4); return o != 0 ? bb.get(o + bb_pos) : 0; }
+  public Table mainCharacter(Table obj) { int o = __offset(6); return o != 0 ? __union(obj, o) : null; }
+  public byte charactersType(int j) { int o = __offset(8); return o != 0 ? bb.get(__vector(o) + j * 1) : 0; }
+  public int charactersTypeLength() { int o = __offset(8); return o != 0 ? __vector_len(o) : 0; }
+  public ByteBuffer charactersTypeAsByteBuffer() { return __vector_as_bytebuffer(8, 1); }
+  public ByteBuffer charactersTypeInByteBuffer(ByteBuffer _bb) { return __vector_in_bytebuffer(_bb, 8, 1); }
+  public Table characters(Table obj, int j) { int o = __offset(10); return o != 0 ? __union(obj, __vector(o) + j * 4) : null; }
+  public int charactersLength() { int o = __offset(10); return o != 0 ? __vector_len(o) : 0; }
+
+  public static int createMovie(FlatBufferBuilder builder,
+      byte main_character_type,
+      int main_characterOffset,
+      int characters_typeOffset,
+      int charactersOffset) {
+    builder.startObject(4);
+    Movie.addCharacters(builder, charactersOffset);
+    Movie.addCharactersType(builder, characters_typeOffset);
+    Movie.addMainCharacter(builder, main_characterOffset);
+    Movie.addMainCharacterType(builder, main_character_type);
+    return Movie.endMovie(builder);
+  }
+
+  public static void startMovie(FlatBufferBuilder builder) { builder.startObject(4); }
+  public static void addMainCharacterType(FlatBufferBuilder builder, byte mainCharacterType) { builder.addByte(0, mainCharacterType, 0); }
+  public static void addMainCharacter(FlatBufferBuilder builder, int mainCharacterOffset) { builder.addOffset(1, mainCharacterOffset, 0); }
+  public static void addCharactersType(FlatBufferBuilder builder, int charactersTypeOffset) { builder.addOffset(2, charactersTypeOffset, 0); }
+  public static int createCharactersTypeVector(FlatBufferBuilder builder, byte[] data) { builder.startVector(1, data.length, 1); for (int i = data.length - 1; i >= 0; i--) builder.addByte(data[i]); return builder.endVector(); }
+  public static void startCharactersTypeVector(FlatBufferBuilder builder, int numElems) { builder.startVector(1, numElems, 1); }
+  public static void addCharacters(FlatBufferBuilder builder, int charactersOffset) { builder.addOffset(3, charactersOffset, 0); }
+  public static int createCharactersVector(FlatBufferBuilder builder, int[] data) { builder.startVector(4, data.length, 4); for (int i = data.length - 1; i >= 0; i--) builder.addOffset(data[i]); return builder.endVector(); }
+  public static void startCharactersVector(FlatBufferBuilder builder, int numElems) { builder.startVector(4, numElems, 4); }
+  public static int endMovie(FlatBufferBuilder builder) {
+    int o = builder.endObject();
+    return o;
+  }
+  public static void finishMovieBuffer(FlatBufferBuilder builder, int offset) { builder.finish(offset, "MOVI"); }
+  public static void finishSizePrefixedMovieBuffer(FlatBufferBuilder builder, int offset) { builder.finishSizePrefixed(offset, "MOVI"); }
+}
+
diff --git a/tests/union_vector/Rapunzel.cs b/tests/union_vector/Rapunzel.cs
new file mode 100644
index 00000000..4928f5d4
--- /dev/null
+++ b/tests/union_vector/Rapunzel.cs
@@ -0,0 +1,23 @@
+// <auto-generated>
+//  automatically generated by the FlatBuffers compiler, do not modify
+// </auto-generated>
+
+using global::System;
+using global::FlatBuffers;
+
+public struct Rapunzel : IFlatbufferObject
+{
+  private Struct __p;
+  public ByteBuffer ByteBuffer { get { return __p.bb; } }
+  public void __init(int _i, ByteBuffer _bb) { __p.bb_pos = _i; __p.bb = _bb; }
+  public Rapunzel __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public int HairLength { get { return __p.bb.GetInt(__p.bb_pos + 0); } }
+
+  public static Offset<Rapunzel> CreateRapunzel(FlatBufferBuilder builder, int HairLength) {
+    builder.Prep(4, 4);
+    builder.PutInt(HairLength);
+    return new Offset<Rapunzel>(builder.Offset);
+  }
+};
+
diff --git a/tests/union_vector/Rapunzel.java b/tests/union_vector/Rapunzel.java
new file mode 100644
index 00000000..7c059f48
--- /dev/null
+++ b/tests/union_vector/Rapunzel.java
@@ -0,0 +1,21 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+import java.nio.*;
+import java.lang.*;
+import java.util.*;
+import com.google.flatbuffers.*;
+
+@SuppressWarnings("unused")
+public final class Rapunzel extends Struct {
+  public void __init(int _i, ByteBuffer _bb) { bb_pos = _i; bb = _bb; }
+  public Rapunzel __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public int hairLength() { return bb.getInt(bb_pos + 0); }
+
+  public static int createRapunzel(FlatBufferBuilder builder, int hairLength) {
+    builder.prep(4, 4);
+    builder.putInt(hairLength);
+    return builder.offset();
+  }
+}
+