sustain/src/main/java/net/happyonroad/component/core/support/ComponentFolderResource.java
@Override
    public InputStream getInputStream(String relativePath) throws IOException {
        File file = new File(folder, relativePath);
        if( !file.exists() )                      {
            String msg = String.format("Can't find any file with relative path = `%s` in folder: `%s`",
                                       relativePath, folder.getAbsolutePath());
            throw new IllegalArgumentException(msg);
        }
        return new FileInputStream(file);
    }
@Override
    public InputStream getInputStream(String relativePath) throws IOException {
        File file = new File(folder, relativePath);
        if( !file.exists() )                      {
            String msg = String.format("Can't find any file with relative path = `%s` in folder: `%s`",
                                       relativePath, folder.getAbsolutePath());
            throw new IllegalArgumentException(msg);
        }
        return new FileInputStream(file);
    }
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