


![image](https://user-images.githubusercontent.com/4089452/60226937-ee8e7600-98bf-11e9-8d62-76d59976cd3f.png)


![image](https://user-images.githubusercontent.com/4089452/60226950-fd752880-98bf-11e9-90f1-627436f950ca.png)


The application will not find protobuf class, and throw exception.


private static final List<TypeBuilder> BUILDERS;
    static {
        List<TypeBuilder> builders = new ArrayList<>();
        ExtensionLoader<TypeBuilder> extensionLoader = ExtensionLoader.getExtensionLoader(TypeBuilder.class);
        for (String extensionName : extensionLoader.getSupportedExtensions()) {
            builders.add(extensionLoader.getExtension(extensionName));
        }
        BUILDERS = builders;