"how create a custom converter in jsf 2?" Code Answer
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you're trying to pass a complex object around as http request parameter which can be only be a
string. jsf/el has builtin converters for primitives and its wrappers (e.g.
integer) and even enums. but for all other types you really need to write a custom converter. in this case you need to write a converter which converts between
stringis then used as option value (open page in browser, rightclick and view source and notice the
<option value>). the
operationis then used as model value. the
stringshould uniquely identify the
operationobject. you could use operation id for this.
but in this particular case, with such a hardcoded map and a relatively simple model, i think it's easier to use an
but if those values have actually to be retrieved from the db and its size is undefinied, then you still really need a custom converter. you could in
getasstring()return the id and in
getasobject()use the operation dao/ejb to get an
operationby the id.
use it as follows:
as to why it's a
@facesconverter, read this: converting and validating get request parameters.
update as to the
validation error: value not validerror, this means that the
equals()method of the
operationclass is broken or missing. during validation, jsf compares the submitted value with the list of available values by
object#equals(). if no one of the list matches with the submitted value, then you'll see this error. so, ensure that
equals()is properly implemented. here's a basic example which compares by the db technical identity.
don't forget to implement