#2725: Various improvements to chat API

* More versatile ComponentBuilder system
    - Allow creating a builder without an initial component
    - Duplicate the parts when component is created
    - Add getter for 'parts'
* Added cursor API for more fluid component modifying
* Don't legacy convert Titles on 1.11 or newer
* Simplify plain and legacy text converting code
    - Shares the addFormat method between all superclasses
    - Duplicate code in TranslatableComponent moved in separate method

chat/src/main/java/net/md_5/bungee/api/chat/BaseComponent.java

@@ -505,4 +505,29 @@ public abstract class BaseComponent
             }
         }
     }
+
+    void addFormat(StringBuilder builder)
+    {
+        builder.append( getColor() );
+        if ( isBold() )
+        {
+            builder.append( ChatColor.BOLD );
+        }
+        if ( isItalic() )
+        {
+            builder.append( ChatColor.ITALIC );
+        }
+        if ( isUnderlined() )
+        {
+            builder.append( ChatColor.UNDERLINE );
+        }
+        if ( isStrikethrough() )
+        {
+            builder.append( ChatColor.STRIKETHROUGH );
+        }
+        if ( isObfuscated() )
+        {
+            builder.append( ChatColor.MAGIC );
+        }
+    }
 }

chat/src/main/java/net/md_5/bungee/api/chat/ComponentBuilder.java

@@ -3,6 +3,8 @@ package net.md_5.bungee.api.chat;
 import com.google.common.base.Preconditions;
 import java.util.ArrayList;
 import java.util.List;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
 import net.md_5.bungee.api.ChatColor;
 
 /**
@@ -23,11 +25,29 @@ import net.md_5.bungee.api.ChatColor;
  * part's formatting
  * </p>
  */
+@NoArgsConstructor
 public final class ComponentBuilder
 {
 
-    private BaseComponent current;
+    /**
+     * The position for the current part to modify. Modified cursors will
+     * automatically reset to the last part after appending new components.
+     * Default value at -1 to assert that the builder has no parts.
+     */
+    @Getter
+    private int cursor = -1;
+    @Getter
     private final List<BaseComponent> parts = new ArrayList<BaseComponent>();
+    private BaseComponent dummy;
+
+    private ComponentBuilder(BaseComponent[] parts)
+    {
+        for ( BaseComponent baseComponent : parts )
+        {
+            this.parts.add( baseComponent.duplicate() );
+        }
+        resetCursor();
+    }
 
     /**
      * Creates a ComponentBuilder from the other given ComponentBuilder to clone
@@ -37,11 +57,7 @@ public final class ComponentBuilder
      */
     public ComponentBuilder(ComponentBuilder original)
     {
-        current = original.current.duplicate();
+        this( original.parts.toArray( new BaseComponent[ original.parts.size() ] ) );
-        for ( BaseComponent baseComponent : original.parts )
-        {
-            parts.add( baseComponent.duplicate() );
-        }
     }
 
     /**
@@ -51,7 +67,7 @@ public final class ComponentBuilder
      */
     public ComponentBuilder(String text)
     {
-        current = new TextComponent( text );
+        this( new TextComponent( text ) );
     }
 
     /**
@@ -61,7 +77,58 @@ public final class ComponentBuilder
      */
     public ComponentBuilder(BaseComponent component)
     {
-        current = component.duplicate();
+
+        this( new BaseComponent[]
+        {
+            component
+        } );
+    }
+
+    private BaseComponent getDummy()
+    {
+        if ( dummy == null )
+        {
+            dummy = new BaseComponent()
+            {
+                @Override
+                public BaseComponent duplicate()
+                {
+                    return this;
+                }
+            };
+        }
+        return dummy;
+    }
+
+    /**
+     * Resets the cursor to index of the last element.
+     *
+     * @return this ComponentBuilder for chaining
+     */
+    public ComponentBuilder resetCursor()
+    {
+        cursor = parts.size() - 1;
+        return this;
+    }
+
+    /**
+     * Sets the position of the current component to be modified
+     *
+     * @param pos the cursor position synonymous to an element position for a
+     * list
+     * @throws IndexOutOfBoundsException if the index is out of range
+     * ({@code index < 0 || index >= size()})
+     * @return this ComponentBuilder for chaining
+     */
+    public ComponentBuilder setCursor(int pos) throws IndexOutOfBoundsException
+    {
+        if ( ( this.cursor != pos ) && ( pos < 0 || pos >= parts.size() ) )
+        {
+            throw new IndexOutOfBoundsException( "Cursor out of bounds (expected between 0 + " + ( parts.size() - 1 ) + ")" );
+        }
+
+        this.cursor = pos;
+        return this;
     }
 
     /**
@@ -88,11 +155,18 @@ public final class ComponentBuilder
      */
     public ComponentBuilder append(BaseComponent component, FormatRetention retention)
     {
-        parts.add( current );
+        BaseComponent previous = ( parts.isEmpty() ) ? null : parts.get( parts.size() - 1 );
-
+        if ( previous == null )
-        BaseComponent previous = current;
+        {
-        current = component.duplicate();
+            previous = dummy;
-        current.copyFormatting( previous, retention, false );
+            dummy = null;
+        }
+        if ( previous != null )
+        {
+            component.copyFormatting( previous, retention, false );
+        }
+        parts.add( component );
+        resetCursor();
         return this;
     }
 
@@ -122,13 +196,9 @@ public final class ComponentBuilder
     {
         Preconditions.checkArgument( components.length != 0, "No components to append" );
 
-        BaseComponent previous = current;
         for ( BaseComponent component : components )
         {
-            parts.add( current );
+            append( component, retention );
-
-            current = component.duplicate();
-            current.copyFormatting( previous, retention, false );
         }
 
         return this;
@@ -170,13 +240,7 @@ public final class ComponentBuilder
      */
     public ComponentBuilder append(String text, FormatRetention retention)
     {
-        parts.add( current );
+        return append( new TextComponent( text ), retention );
-
-        BaseComponent old = current;
-        current = new TextComponent( text );
-        current.copyFormatting( old, retention, false );
-
-        return this;
     }
 
     /**
@@ -210,6 +274,44 @@ public final class ComponentBuilder
         return joiner.join( this, retention );
     }
 
+    /**
+     * Remove the component part at the position of given index.
+     *
+     * @param pos the index to remove at
+     * @throws IndexOutOfBoundsException if the index is out of range
+     * ({@code index < 0 || index >= size()})
+     */
+    public void removeComponent(int pos) throws IndexOutOfBoundsException
+    {
+        if ( parts.remove( pos ) != null )
+        {
+            resetCursor();
+        }
+    }
+
+    /**
+     * Gets the component part at the position of given index.
+     *
+     * @param pos the index to find
+     * @return the component
+     * @throws IndexOutOfBoundsException if the index is out of range
+     * ({@code index < 0 || index >= size()})
+     */
+    public BaseComponent getComponent(int pos) throws IndexOutOfBoundsException
+    {
+        return parts.get( pos );
+    }
+
+    /**
+     * Gets the component at the position of the cursor.
+     *
+     * @return the active component or null if builder is empty
+     */
+    public BaseComponent getCurrentComponent()
+    {
+        return ( cursor == -1 ) ? getDummy() : parts.get( cursor );
+    }
+
     /**
      * Sets the color of the current part.
      *
@@ -218,7 +320,7 @@ public final class ComponentBuilder
      */
     public ComponentBuilder color(ChatColor color)
     {
-        current.setColor( color );
+        getCurrentComponent().setColor( color );
         return this;
     }
 
@@ -230,7 +332,7 @@ public final class ComponentBuilder
      */
     public ComponentBuilder bold(boolean bold)
     {
-        current.setBold( bold );
+        getCurrentComponent().setBold( bold );
         return this;
     }
 
@@ -242,7 +344,7 @@ public final class ComponentBuilder
      */
     public ComponentBuilder italic(boolean italic)
     {
-        current.setItalic( italic );
+        getCurrentComponent().setItalic( italic );
         return this;
     }
 
@@ -254,7 +356,7 @@ public final class ComponentBuilder
      */
     public ComponentBuilder underlined(boolean underlined)
     {
-        current.setUnderlined( underlined );
+        getCurrentComponent().setUnderlined( underlined );
         return this;
     }
 
@@ -266,7 +368,7 @@ public final class ComponentBuilder
      */
     public ComponentBuilder strikethrough(boolean strikethrough)
     {
-        current.setStrikethrough( strikethrough );
+        getCurrentComponent().setStrikethrough( strikethrough );
         return this;
     }
 
@@ -278,7 +380,7 @@ public final class ComponentBuilder
      */
     public ComponentBuilder obfuscated(boolean obfuscated)
     {
-        current.setObfuscated( obfuscated );
+        getCurrentComponent().setObfuscated( obfuscated );
         return this;
     }
 
@@ -290,7 +392,7 @@ public final class ComponentBuilder
      */
     public ComponentBuilder insertion(String insertion)
     {
-        current.setInsertion( insertion );
+        getCurrentComponent().setInsertion( insertion );
         return this;
     }
 
@@ -302,7 +404,7 @@ public final class ComponentBuilder
      */
     public ComponentBuilder event(ClickEvent clickEvent)
     {
-        current.setClickEvent( clickEvent );
+        getCurrentComponent().setClickEvent( clickEvent );
         return this;
     }
 
@@ -314,7 +416,7 @@ public final class ComponentBuilder
      */
     public ComponentBuilder event(HoverEvent hoverEvent)
     {
-        current.setHoverEvent( hoverEvent );
+        getCurrentComponent().setHoverEvent( hoverEvent );
         return this;
     }
 
@@ -336,24 +438,28 @@ public final class ComponentBuilder
      */
     public ComponentBuilder retain(FormatRetention retention)
     {
-        current.retain( retention );
+        getCurrentComponent().retain( retention );
         return this;
     }
 
     /**
      * Returns the components needed to display the message created by this
-     * builder.
+     * builder.git
      *
      * @return the created components
      */
     public BaseComponent[] create()
     {
-        BaseComponent[] result = parts.toArray( new BaseComponent[ parts.size() + 1 ] );
+        BaseComponent[] cloned = new BaseComponent[ parts.size() ];
-        result[parts.size()] = current;
+        int i = 0;
-        return result;
+        for ( BaseComponent part : parts )
+        {
+            cloned[i++] = part.duplicate();
+        }
+        return cloned;
     }
 
-    public static enum FormatRetention
+    public enum FormatRetention
     {
 
         /**

chat/src/main/java/net/md_5/bungee/api/chat/KeybindComponent.java

@@ -5,7 +5,6 @@ import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 import lombok.ToString;
-import net.md_5.bungee.api.ChatColor;
 
 @Getter
 @Setter
@@ -60,29 +59,8 @@ public final class KeybindComponent extends BaseComponent
     @Override
     protected void toLegacyText(StringBuilder builder)
     {
-        builder.append( getColor() );
+        addFormat( builder );
-        if ( isBold() )
-        {
-            builder.append( ChatColor.BOLD );
-        }
-        if ( isItalic() )
-        {
-            builder.append( ChatColor.ITALIC );
-        }
-        if ( isUnderlined() )
-        {
-            builder.append( ChatColor.UNDERLINE );
-        }
-        if ( isStrikethrough() )
-        {
-            builder.append( ChatColor.STRIKETHROUGH );
-        }
-        if ( isObfuscated() )
-        {
-            builder.append( ChatColor.MAGIC );
-        }
         builder.append( getKeybind() );
-
         super.toLegacyText( builder );
     }
 }

chat/src/main/java/net/md_5/bungee/api/chat/ScoreComponent.java

@@ -84,9 +84,17 @@ public final class ScoreComponent extends BaseComponent
         return new ScoreComponent( this );
     }
 
+    @Override
+    protected void toPlainText(StringBuilder builder)
+    {
+        builder.append( this.value );
+        super.toPlainText( builder );
+    }
+
     @Override
     protected void toLegacyText(StringBuilder builder)
     {
+        addFormat( builder );
         builder.append( this.value );
         super.toLegacyText( builder );
     }

chat/src/main/java/net/md_5/bungee/api/chat/SelectorComponent.java

@@ -50,9 +50,17 @@ public final class SelectorComponent extends BaseComponent
         return new SelectorComponent( this );
     }
 
+    @Override
+    protected void toPlainText(StringBuilder builder)
+    {
+        builder.append( this.selector );
+        super.toPlainText( builder );
+    }
+
     @Override
     protected void toLegacyText(StringBuilder builder)
     {
+        addFormat( builder );
         builder.append( this.selector );
         super.toLegacyText( builder );
     }

chat/src/main/java/net/md_5/bungee/api/chat/TextComponent.java

@@ -2,6 +2,7 @@ package net.md_5.bungee.api.chat;
 
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.List;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import lombok.AllArgsConstructor;
@@ -172,8 +173,26 @@ public final class TextComponent extends BaseComponent
      */
     public TextComponent(BaseComponent... extras)
     {
-        setText( "" );
+        if ( extras.length == 0 )
-        setExtra( new ArrayList<BaseComponent>( Arrays.asList( extras ) ) );
+        {
+            return;
+        }
+        if ( extras.length == 1 && extras[0] instanceof TextComponent )
+        {
+            setText( ( (TextComponent) extras[0] ).getText() );
+            List<BaseComponent> headExtra = extras[0].getExtra();
+            if ( headExtra != null )
+            {
+                for ( BaseComponent extra : headExtra )
+                {
+                    addExtra( extra.duplicate() );
+                }
+            }
+        } else
+        {
+            setText( "" );
+            setExtra( new ArrayList<BaseComponent>( Arrays.asList( extras ) ) );
+        }
     }
 
     /**
@@ -197,27 +216,7 @@ public final class TextComponent extends BaseComponent
     @Override
     protected void toLegacyText(StringBuilder builder)
     {
-        builder.append( getColor() );
+        addFormat( builder );
-        if ( isBold() )
-        {
-            builder.append( ChatColor.BOLD );
-        }
-        if ( isItalic() )
-        {
-            builder.append( ChatColor.ITALIC );
-        }
-        if ( isUnderlined() )
-        {
-            builder.append( ChatColor.UNDERLINE );
-        }
-        if ( isStrikethrough() )
-        {
-            builder.append( ChatColor.STRIKETHROUGH );
-        }
-        if ( isObfuscated() )
-        {
-            builder.append( ChatColor.MAGIC );
-        }
         builder.append( text );
         super.toLegacyText( builder );
     }

chat/src/main/java/net/md_5/bungee/api/chat/TranslatableComponent.java

@@ -9,7 +9,6 @@ import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 import lombok.ToString;
-import net.md_5.bungee.api.ChatColor;
 import net.md_5.bungee.chat.TranslationRegistry;
 
 @Getter
@@ -139,43 +138,18 @@ public final class TranslatableComponent extends BaseComponent
     @Override
     protected void toPlainText(StringBuilder builder)
     {
-        String trans = TranslationRegistry.INSTANCE.translate( translate );
+        convert( builder, false );
-
-        Matcher matcher = format.matcher( trans );
-        int position = 0;
-        int i = 0;
-        while ( matcher.find( position ) )
-        {
-            int pos = matcher.start();
-            if ( pos != position )
-            {
-                builder.append( trans.substring( position, pos ) );
-            }
-            position = matcher.end();
-
-            String formatCode = matcher.group( 2 );
-            switch ( formatCode.charAt( 0 ) )
-            {
-                case 's':
-                case 'd':
-                    String withIndex = matcher.group( 1 );
-                    with.get( withIndex != null ? Integer.parseInt( withIndex ) - 1 : i++ ).toPlainText( builder );
-                    break;
-                case '%':
-                    builder.append( '%' );
-                    break;
-            }
-        }
-        if ( trans.length() != position )
-        {
-            builder.append( trans.substring( position, trans.length() ) );
-        }
-
         super.toPlainText( builder );
     }
 
     @Override
     protected void toLegacyText(StringBuilder builder)
+    {
+        convert( builder, true );
+        super.toLegacyText( builder );
+    }
+
+    private void convert(StringBuilder builder, boolean applyFormat)
     {
         String trans = TranslationRegistry.INSTANCE.translate( translate );
 
@@ -187,7 +161,10 @@ public final class TranslatableComponent extends BaseComponent
             int pos = matcher.start();
             if ( pos != position )
             {
-                addFormat( builder );
+                if ( applyFormat )
+                {
+                    addFormat( builder );
+                }
                 builder.append( trans.substring( position, pos ) );
             }
             position = matcher.end();
@@ -198,44 +175,32 @@ public final class TranslatableComponent extends BaseComponent
                 case 's':
                 case 'd':
                     String withIndex = matcher.group( 1 );
-                    with.get( withIndex != null ? Integer.parseInt( withIndex ) - 1 : i++ ).toLegacyText( builder );
+
+                    BaseComponent withComponent = with.get( withIndex != null ? Integer.parseInt( withIndex ) - 1 : i++ );
+                    if ( applyFormat )
+                    {
+                        withComponent.toLegacyText( builder );
+                    } else
+                    {
+                        withComponent.toPlainText( builder );
+                    }
                     break;
                 case '%':
-                    addFormat( builder );
+                    if ( applyFormat )
+                    {
+                        addFormat( builder );
+                    }
                     builder.append( '%' );
                     break;
             }
         }
         if ( trans.length() != position )
         {
-            addFormat( builder );
+            if ( applyFormat )
+            {
+                addFormat( builder );
+            }
             builder.append( trans.substring( position, trans.length() ) );
         }
-        super.toLegacyText( builder );
-    }
-
-    private void addFormat(StringBuilder builder)
-    {
-        builder.append( getColor() );
-        if ( isBold() )
-        {
-            builder.append( ChatColor.BOLD );
-        }
-        if ( isItalic() )
-        {
-            builder.append( ChatColor.ITALIC );
-        }
-        if ( isUnderlined() )
-        {
-            builder.append( ChatColor.UNDERLINE );
-        }
-        if ( isStrikethrough() )
-        {
-            builder.append( ChatColor.STRIKETHROUGH );
-        }
-        if ( isObfuscated() )
-        {
-            builder.append( ChatColor.MAGIC );
-        }
     }
 }

chat/src/main/java/net/md_5/bungee/chat/TranslatableComponentSerializer.java

@@ -24,7 +24,7 @@ public class TranslatableComponentSerializer extends BaseComponentSerializer imp
         component.setTranslate( object.get( "translate" ).getAsString() );
         if ( object.has( "with" ) )
         {
-            component.setWith( Arrays.asList( (BaseComponent[]) context.deserialize( object.get( "with" ), BaseComponent[].class ) ) );
+            component.setWith( Arrays.asList( context.<BaseComponent>deserialize( object.get( "with" ), BaseComponent[].class ) ) );
         }
         return component;
     }

chat/src/test/java/net/md_5/bungee/api/chat/ComponentsTest.java

@@ -11,16 +11,112 @@ import org.junit.Test;
 public class ComponentsTest
 {
 
+    @Test
+    public void testEmptyComponentBuilder()
+    {
+        ComponentBuilder builder = new ComponentBuilder();
+
+        BaseComponent[] parts = builder.create();
+        Assert.assertEquals( parts.length, 0 );
+
+        for ( int i = 0; i < 3; i++ )
+        {
+            builder.append( "part:" + i );
+            parts = builder.create();
+            Assert.assertEquals( parts.length, i + 1 );
+        }
+    }
+
+    @Test
+    public void testDummyRetaining()
+    {
+        ComponentBuilder builder = new ComponentBuilder();
+        Assert.assertNotNull( builder.getCurrentComponent() );
+        builder.color( ChatColor.GREEN );
+        builder.append( "test ", ComponentBuilder.FormatRetention.ALL );
+        Assert.assertEquals( builder.getCurrentComponent().getColor(), ChatColor.GREEN );
+    }
+
+    @Test(expected = IndexOutOfBoundsException.class)
+    public void testComponentGettingExceptions()
+    {
+        ComponentBuilder builder = new ComponentBuilder();
+        builder.getComponent( -1 );
+        builder.getComponent( 0 );
+        builder.getComponent( 1 );
+        BaseComponent component = new TextComponent( "Hello" );
+        builder.append( component );
+        Assert.assertEquals( builder.getComponent( 0 ), component );
+        builder.getComponent( 1 );
+    }
+
+    @Test
+    public void testComponentParting()
+    {
+        ComponentBuilder builder = new ComponentBuilder();
+        TextComponent apple = new TextComponent( "apple" );
+        builder.append( apple );
+        Assert.assertEquals( builder.getCurrentComponent(), apple );
+        Assert.assertEquals( builder.getComponent( 0 ), apple );
+
+        TextComponent mango = new TextComponent( "mango" );
+        TextComponent orange = new TextComponent( "orange" );
+        builder.append( mango );
+        builder.append( orange );
+        builder.removeComponent( 1 ); // Removing mango
+        Assert.assertEquals( builder.getComponent( 0 ), apple );
+        Assert.assertEquals( builder.getComponent( 1 ), orange );
+    }
+
+    @Test
+    public void testToLegacyFromLegacy()
+    {
+        String text = "§a§lHello §f§kworld§7!";
+        Assert.assertEquals( text, TextComponent.toLegacyText( TextComponent.fromLegacyText( text ) ) );
+    }
+
+    @Test(expected = IndexOutOfBoundsException.class)
+    public void testComponentBuilderCursorInvalidPos()
+    {
+        ComponentBuilder builder = new ComponentBuilder();
+        builder.append( new TextComponent( "Apple, " ) );
+        builder.append( new TextComponent( "Orange, " ) );
+        builder.setCursor( -1 );
+        builder.setCursor( 2 );
+    }
+
+    @Test
+    public void testComponentBuilderCursor()
+    {
+        TextComponent t1, t2, t3;
+        ComponentBuilder builder = new ComponentBuilder();
+        Assert.assertEquals( builder.getCursor(), -1 );
+        builder.append( t1 = new TextComponent( "Apple, " ) );
+        Assert.assertEquals( builder.getCursor(), 0 );
+        builder.append( t2 = new TextComponent( "Orange, " ) );
+        builder.append( t3 = new TextComponent( "Mango, " ) );
+        Assert.assertEquals( builder.getCursor(), 2 );
+
+        builder.setCursor( 0 );
+        Assert.assertEquals( builder.getCurrentComponent(), t1 );
+
+        // Test that appending new components updates the position to the new list size
+        // after having previously set it to 0 (first component)
+        builder.append( new TextComponent( "and Grapefruit" ) );
+        Assert.assertEquals( builder.getCursor(), 3 );
+
+        builder.setCursor( 0 );
+        builder.resetCursor();
+        Assert.assertEquals( builder.getCursor(), 3 );
+    }
+
     @Test
     public void testLegacyComponentBuilderAppend()
     {
         String text = "§a§lHello §r§kworld§7!";
         BaseComponent[] components = TextComponent.fromLegacyText( text );
-        BaseComponent[] builderComponents = new ComponentBuilder( "" ).append( components ).create();
+        BaseComponent[] builderComponents = new ComponentBuilder().append( components ).create();
         List<BaseComponent> list = new ArrayList<BaseComponent>( Arrays.asList( builderComponents ) );
-        // Remove the first element (empty text component). This needs to be done because toLegacyText always
-        // appends &f regardless if the color is non null or not and would otherwise mess with our unit test.
-        list.remove( 0 );
         Assert.assertEquals(
                 TextComponent.toLegacyText( components ),
                 TextComponent.toLegacyText( list.toArray( new BaseComponent[ list.size() ] ) )
@@ -28,7 +124,7 @@ public class ComponentsTest
     }
 
     @Test
-    public void testComponentFormatRetention()
+    public void testFormatRetentionCopyFormatting()
     {
         TextComponent first = new TextComponent( "Hello" );
         first.setBold( true );
@@ -47,7 +143,7 @@ public class ComponentsTest
     @Test
     public void testBuilderClone()
     {
-        ComponentBuilder builder = new ComponentBuilder( "Hel" ).color( ChatColor.RED ).append( "lo" ).color( ChatColor.DARK_RED );
+        ComponentBuilder builder = new ComponentBuilder( "Hello " ).color( ChatColor.RED ).append( "world" ).color( ChatColor.DARK_RED );
         ComponentBuilder cloned = new ComponentBuilder( builder );
 
         Assert.assertEquals( TextComponent.toLegacyText( builder.create() ), TextComponent.toLegacyText( cloned.create() ) );

module/cmd-server/src/main/java/net/md_5/bungee/module/cmd/server/CommandServer.java

@@ -40,7 +40,7 @@ public class CommandServer extends Command implements TabExecutor
                 sender.sendMessage( ProxyServer.getInstance().getTranslation( "current_server", ( (ProxiedPlayer) sender ).getServer().getInfo().getName() ) );
             }
 
-            ComponentBuilder serverList = new ComponentBuilder( "" ).appendLegacy( ProxyServer.getInstance().getTranslation( "server_list" ) );
+            ComponentBuilder serverList = new ComponentBuilder().appendLegacy( ProxyServer.getInstance().getTranslation( "server_list" ) );
             boolean first = true;
             for ( ServerInfo server : servers.values() )
             {

proxy/src/main/java/net/md_5/bungee/UserConnection.java

@@ -51,6 +51,7 @@ import net.md_5.bungee.protocol.MinecraftDecoder;
 import net.md_5.bungee.protocol.MinecraftEncoder;
 import net.md_5.bungee.protocol.PacketWrapper;
 import net.md_5.bungee.protocol.Protocol;
+import net.md_5.bungee.protocol.ProtocolConstants;
 import net.md_5.bungee.protocol.packet.Chat;
 import net.md_5.bungee.protocol.packet.ClientSettings;
 import net.md_5.bungee.protocol.packet.Kick;
@@ -453,10 +454,20 @@ public final class UserConnection implements ProxiedPlayer
         // transform score components
         message = ChatComponentTransformer.getInstance().transform( this, message );
 
-        // Action bar doesn't display the new JSON formattings, legacy works - send it using this for now
         if ( position == ChatMessageType.ACTION_BAR )
         {
-            sendMessage( position, ComponentSerializer.toString( new TextComponent( BaseComponent.toLegacyText( message ) ) ) );
+            // Versions older than 1.11 cannot send the Action bar with the new JSON formattings
+            // Fix by converting to a legacy message, see https://bugs.mojang.com/browse/MC-119145
+            if ( ProxyServer.getInstance().getProtocolVersion() <= ProtocolConstants.MINECRAFT_1_10 )
+            {
+                sendMessage( position, ComponentSerializer.toString( new TextComponent( BaseComponent.toLegacyText( message ) ) ) );
+            } else
+            {
+                net.md_5.bungee.protocol.packet.Title title = new net.md_5.bungee.protocol.packet.Title();
+                title.setAction( net.md_5.bungee.protocol.packet.Title.Action.ACTIONBAR );
+                title.setText( ComponentSerializer.toString( message ) );
+                unsafe.sendPacket( title );
+            }
         } else
         {
             sendMessage( position, ComponentSerializer.toString( message ) );