Add explicit default constructors to abstract Java classes.

td/generate/JavadocTlDocumentationGenerator.php

@@ -141,6 +141,13 @@ EOT
      * This class is a base class for all TDLib interface classes.
      */
 EOT
+);
+
+        $this->addDocumentation("        public Object() {", <<<EOT
+        /**
+         * Default Object constructor.
+         */
+EOT
 );
 
         $this->addDocumentation('        public abstract int getConstructor();', <<<EOT
@@ -162,6 +169,13 @@ EOT
      * This class is a base class for all TDLib interface function-classes.
      */
 EOT
+);
+
+        $this->addDocumentation("        public Function() {", <<<EOT
+        /**
+         * Default Function constructor.
+         */
+EOT
 );
 
         $this->addDocumentation('        public static final int CONSTRUCTOR', <<<EOT
@@ -187,6 +201,12 @@ EOT
      * $documentation
      */
 EOT
+);
+        $this->addDocumentation("        public $class_name() {", <<<EOT
+        /**
+         * Default class constructor.
+         */
+EOT
 );
     }
 

td/generate/tl_writer_java.cpp

@@ -234,8 +234,11 @@ std::string TD_TL_writer_java::gen_class_begin(const std::string &class_name, co
     full_class_name += "<" + fetched_type + ">";
   }
   std::string result = "    public " + std::string(is_proxy ? "abstract " : "") + full_class_name + " {\n";
+  if (is_proxy) {
+    result += "        public " + class_name + "() {\n        }\n";
+  }
   if (class_name == gen_base_tl_class_name() || class_name == gen_base_function_class_name()) {
-    result += "        public native String toString();\n";
+    result += "\n        public native String toString();\n";
   }
 
   return result;