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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-10857" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-1baaacf9-87b5-4e6c-a289-489545861545" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10857" style="color: #3b73af; text-decoration: none">HHH-10857</a> </td>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-10857" style="color: #3b73af; text-decoration: none">Convert annotation on attribute of @Embeddable does not work</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-1baaacf9-87b5-4e6c-a289-489545861545" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.0.9 </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 15/Jun/2016 08:23 AM </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Environment:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Wildfly 10 </td>
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<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-major-d5a241b8-9b6e-48cf-9d9b-6ff031238f15" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="twwwt" id="email_twwwt" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=twwwt" style="color:#6c797f;; color: #3b73af; text-decoration: none">Thorsten Möller</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">Say I have an entity that contains an element collection of an embeddable type. The embeddable has an attribute that is an enumeration. I want to represent/encode values of the enumeration in the database as a single character, which is why I wrote a converter to do this. Modulo renaming of classes and attributes, the code looks like this:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
class Entity {
<span class="code-comment" style="color: #808080">// ...
</span> @ElementCollection
@CollectionTable(name=<span class="code-quote" style="color: #009100">"entity_l"</span>, joinColumns=@JoinColumn(name=<span class="code-quote" style="color: #009100">"entity_id"</span>))
<span class="code-keyword" style="color: #000091">private</span> List<Embeddable> list;
<span class="code-comment" style="color: #808080">// ...
</span>}
@Embeddable
class Embeddable {
@Column(nullable=<span class="code-keyword" style="color: #000091">false</span>, updatable=<span class="code-keyword" style="color: #000091">false</span>)
@Convert(converter=MyEnumConverter.class)
<span class="code-keyword" style="color: #000091">private</span> MyEnum field;
}
class MyEnumConverter <span class="code-keyword" style="color: #000091">implements</span> AttributeConverter<MyEnum, <span class="code-object" style="color: #910091">Character</span>> { /*...*/ }
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Using Postgres, when Hibernate creates that database schema, it will map the embeddable's field to type `integer` rather than `character(1)`.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I have also tried the following, without any difference (still `integer` used in the database):</p>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
class Entity {
<span class="code-comment" style="color: #808080">// ...
</span> @ElementCollection
@CollectionTable(name=<span class="code-quote" style="color: #009100">"entity_l"</span>, joinColumns=@JoinColumn(name=<span class="code-quote" style="color: #009100">"entity_id"</span>))
@Convert(attributeName = <span class="code-quote" style="color: #009100">"field"</span>, converter=MyEnumConverter.class)
<span class="code-comment" style="color: #808080">// Using @Convert(attributeName = <span class="code-quote" style="color: #009100; color: #808080">"list.field"</span>, converter=MyEnumConverter.class) neither works.
</span> <span class="code-keyword" style="color: #000091">private</span> List<Embeddable> list;
<span class="code-comment" style="color: #808080">// ...
</span>}
@Embeddable
class Embeddable {
@Column(nullable=<span class="code-keyword" style="color: #000091">false</span>, updatable=<span class="code-keyword" style="color: #000091">false</span>)
<span class="code-keyword" style="color: #000091">private</span> MyEnum field;
}
class MyEnumConverter <span class="code-keyword" style="color: #000091">implements</span> AttributeConverter<MyEnum, <span class="code-object" style="color: #910091">Character</span>> { /*...*/ }
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">My first question is whether the JPA spec covers this use case. I could not find any explicit statement that this would not be allowed. In fact, the <a href="https://en.wikibooks.org/wiki/Java_Persistence/Basic_Attributes#Converters_.28JPA_2.1.29" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">JPA Wikibook</a> makes the following statement: </p>
<blockquote style="margin: 10px 0 0 0; border-left: 1px solid #cccccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">Another option, if converting a custom type, is to have the Converter applied to <b>any mapped attribute</b> that has that type.</p>
</blockquote><br> My interpretation of this statement is that the example described above is a very valid use case. Then, however, the behavior I see seems to be a bug. What do you think?<p style="margin: 10px 0 0 0"></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">As a last comment, I have other enumeration attributes in <b>entities</b> (rather than embeddables) where conversion to a single character works well and where the type in the database is indeed `character(1)`.</p> </td>
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