Edit Question - KnowledgeHub

Title Body

I am struggling for almost a week of how to store a HashMap using JPA in Play. All the other attributes are stored, only the HashMap has zero elements (is empty). public class ImageModel extends Model { @Id private String id; private String url; @ElementCollection(targetClass = java.lang.String.class) @MapKeyClass(java.lang.String.class) private Map<String,String> tags = new HashMap<>(); // the method for adding keys and values to the HashMap public void add(String key, String value){ tags.put(key,value); this.save(); } } I also tried to annotate with: @ElementCollection(fetch=FetchType.LAZY) So, my only guess for now is that I have not configured well Play. (I must say that I am using Play2 and haven't configured anything, except deleting "#" (comment mark) in front of database settings). On Play documentation says: " There is no built-in JPA implementation in Play 2.0 ". Could be that the case? Update : I have made some research and said that could be because I'm using the default database from Play - H2. I tried with MySQL - video how to do it , but again it saves only the id and url. I looked in MySQL database and table with the name of the class had only 2 attribute (id and url), no trace of my HashMap. Update2 : Added a print screen - with database query. Update3 : The sample "computer-database-jpa" from Play is working fine, so the JPA should be fine, but that sample didn't used a Map (HashMap). I even changed hibernate with EclipseLink, but still not working. :( (although, all the basic types attributes are in database)

Tags (comma-separated) Cancel