I've got a ConverterNotFoundException in my Spring Roo-application:

Throwable occurred: org.springframework.core.convert.ConverterNotFound Exception: No converter found capable of converting from 'com.Dokumentation' to 'java.lang.String'
According to this guide I added a Converter to ApplicationConversionServiceFactoryBean.java but still get the error.

The code of the aforementioned file is:

Code:
@RooConversionService
public class ApplicationConversionServiceFactoryBean extends FormattingConversionServiceFactoryBean {

@Override
protected void installFormatters(FormatterRegistry registry) {
    super.installFormatters(registry);
    // Register application converters and formatters
}

public Converter<Dokumentation, String> getDokumentationConvert() {
    return new Converter<Dokumentation, String>() {
        public String convert(Dokumentation source) {
            return new StringBuilder().append(source.getWsdl()).toString();
        }
    };
}
}