Hello Jonathan New Tapestry user here, started with a bootstrapped 5.7.3 and experimenting. >
Welcome + enjoy! > What am I doing wrong? There is really no room for error, the Blah class > is defined right there in the same class and the current row object has > absolutely no reason to be converted to String. > Quite the opposite - the String contained in the link needs to be coerced back into a Blah object. Your code will render a useful link (e.g., http://localhost:8080/languages.delete/1). However, when the user clicks it, Tapestry will have to coerce back the context ("1", in my example) to a Blah object but doesn't know how, hence the error. The solution is to contribute a Coercion<String, Blah>, defining how to coerce from a String value to a Blah object. Add the following to your AppModule: public static void contributeTypeCoercer(MappedConfiguration<CoercionTuple.Key, CoercionTuple> configuration) { Coercion<String, Blah> coercion = new Coercion<String, Blah>() { public Blah coerce(String input) { return new Blah(Integer.valueOf(input)); } }; CoercionTuple tuple = new CoercionTuple<String, Blah>(String.class, Blah.class, coercion); configuration.add(tuple.getKey(), tuple); } Note Blah cannot be a static class within the Languages page class. Put Blah in its own package (not within pages, services, or components) and it will work. See https://tapestry.apache.org/type-coercion.html for more details on coercion. Cheers, Volker
