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Stephen Kay commented on JOHNZON-294: ------------------------------------- Well you may close this ticket - this was a confusion with uppercase attributes. This is the full story : @XmlRootElement(name = "MUTATION") public class MutationDate { @XmlElement(name = "DATE", type = String.class) @XmlJavaTypeAdapter(Adapter2.class) @JsonbDateFormat("yyyy-MM-dd HH:mm:ss") private Date date; public Date getDATE() \{return date;} public void setDATE(Date date) \{this.date = date;} } please note uppercase attributes and XML annotations / from an external provider, heavy usage and now migrating from Jackson to Johnzon. Now String json = "\{\"date\":\"2019-12-02 11:04:01\"}"; => returning a date null String json = "\{\"DATE\":\"2019-12-02 11:04:01\"}"; => throws exception javax.json.bind.JsonbException: Text '2019-12-02 11:04:01' could not be parsed at index 10 Solution adding : @JsonbProperty("date") works as a charm with String json = "\{\"date\":\"2019-12-02 11:04:01\"}"; Very best Regards / StackOverflow ticket deleted. > @JsonbDateFormat crashes > ------------------------- > > Key: JOHNZON-294 > URL: https://issues.apache.org/jira/browse/JOHNZON-294 > Project: Johnzon > Issue Type: Bug > Affects Versions: 1.1.12, 1.1.13, 1.2.1 > Reporter: Stephen Kay > Priority: Critical > > [https://stackoverflow.com/questions/59225547/jsonbdateformat-support-with-johnzon] > @JsonbDateFormat raises an exception. > In v1.2.2, If the attribute is transient, the date format input isn't > rekonized / seems that the JSONB annotation isn't implemented correctly. -- This message was sent by Atlassian Jira (v8.3.4#803005)