The annotation @Index is disallowed for this location

Question

When trying to use the @Index annotation from javax.persistence, Eclipse gives me this error.

I\'m using it right before a java.util.

Answer 1

If you use Eclipselink you can add this import to your class:

import org.eclipse.persistence.annotations.Index;

Then add your @Index to your field like this:

public class FooClass {
   @Index
   int field1;
}

or

@Index(columnNames = {"field1", "field2"})
public class FooClass {       
   int field1;
   int field2;
}

Answer 2

The JPA Index annotation can only be used as part of another annotation like @Table, @SecondaryTable, etc. (see the See Also section in the javadoc):

@Table(indexes = { @Index(...) })

Answer 3

See here: https://docs.jboss.org/hibernate/orm/5.2/userguide/html_single/Hibernate_User_Guide.html#annotations-jpa-index

use this:

@Table 
.......,indexes = @Index(columnList = ("COLUMN_NAME"),name="CUSTOM NAME AT INDEX",unique=false)
......