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https://issues.apache.org/jira/browse/OPENJPA-340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12523267
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Pinaki Poddar commented on OPENJPA-340:
---------------------------------------

Currently partial support exists. Unique constraints can be specified at @Table 
annotation is processed.

For example, given 
  
@Entity
@Table(name="Person",[EMAIL PROTECTED](columnNames={"first","last"}))
public class Person {
        @Id
        private long id;
        private String first;
        private String last;
}

will generate following table schema
CREATE TABLE Person (id BIGINT NOT NULL, first VARCHAR(255), last VARCHAR(255), 
PRIMARY KEY (id), UNIQUE (first, last))


> @UniqueConstraint and corresponding XML ignored
> -----------------------------------------------
>
>                 Key: OPENJPA-340
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-340
>             Project: OpenJPA
>          Issue Type: Bug
>            Reporter: Patrick Linskey
>             Fix For: 1.1.0
>
>
> OpenJPA ignores @UniqueConstraint annotations (and the corresponding XML 
> declaration) when generating database schemas. This should be rectified.
> A workaround is to set the -ignoreErrors flag to true when running 
> mappingtool, which will let schema creation continue despite the error.

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