added missed properties to map schema for java generators

Author: HugoMario

src/main/java/io/swagger/codegen/v3/generators/DefaultCodegenConfig.java

@@ -3061,7 +3061,7 @@ protected void addImport(CodegenModel m, String type) {
         }
     }
 
-    private void addVars(CodegenModel codegenModel, Map<String, Schema> properties, List<String> required) {
+    protected void addVars(CodegenModel codegenModel, Map<String, Schema> properties, List<String> required) {
         addVars(codegenModel, properties, required, null, null);
     }
 

src/main/java/io/swagger/codegen/v3/generators/java/AbstractJavaCodegen.java

@@ -941,6 +941,12 @@ public CodegenModel fromModel(String name, Schema schema, Map<String, Schema> al
         return codegenModel;
     }
 
+    @Override
+    protected void addAdditionPropertiesToCodeGenModel(CodegenModel codegenModel, Schema schema) {
+        super.addAdditionPropertiesToCodeGenModel(codegenModel, schema);
+        addVars(codegenModel, schema.getProperties(), schema.getRequired());
+    }
+
     @Override
     public void postProcessModelProperty(CodegenModel model, CodegenProperty property) {
         if(serializeBigDecimalAsString) {