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POPlay Framework: Solution for storing a Map, key - value using JPA
 

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  1. POPlay Framework: Solution for storing a Map, key - value using JPA
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    <p>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).</p> <pre><code>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&lt;String,String&gt; tags = new HashMap&lt;&gt;(); // the method for adding keys and values to the HashMap public void add(String key, String value){ tags.put(key,value); this.save(); } } </code></pre> <p>I also tried to annotate with:</p> <pre><code>@ElementCollection(fetch=FetchType.LAZY) </code></pre> <p>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).</p> <p>On Play documentation says: "<strong>There is no built-in JPA implementation in Play 2.0</strong>". Could be that the case?</p> <p><strong>Update</strong>: I have made some research and said that could be because I'm using the default database from Play - H2. I tried with MySQL - <a href="http://www.youtube.com/watch?v=HwDlnTg_H-o" rel="nofollow">video how to do it</a> , 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.</p> <p><strong>Update2</strong>: Added a print screen - <a href="http://prntscr.com/17b2t9" rel="nofollow">with database query.</a></p> <p><strong>Update3</strong>: 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)</p>
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    1. USAlin Ciocan
    1. USAlin Ciocan
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      1. POPlay Framework: Solution for storing a Map, key - value using JPA
      1. USAlin Ciocan
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      1. POPlay Framework: Solution for storing a Map, key - value using JPA
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    1. COyou see the sample project provided(computer-database-jpa) in the play framework folder to verify the configuration.
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      1. POPlay Framework: Solution for storing a Map, key - value using JPA
      1. USTapan Chandra
    2. COI tested computer-database-jpa from java folder and works fine.
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      1. POPlay Framework: Solution for storing a Map, key - value using JPA
      1. USAlin Ciocan
    3. COI don't think it has anything to do with Play Framework. The other attributes are saved, so the persistence is working. You should modify the title and the tags of your question, you'd have more answers.
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      1. POPlay Framework: Solution for storing a Map, key - value using JPA
      1. USEric Citaire
 

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