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Excepion: mapping cannot have columns in this context(JPA/OpenJPA OneToMany using single table)

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I want use JPA(provider:OpenJPA) to implement the funciton of category without level limit, and just using one table like the following, and use the annotation:
[b ]@OneToMany(fetch=FetchType.LAZY)

But there alaway exception when using "org.apache.openjpa.jdbc.meta.MappingTool" to generate schema or access data after created schema manually.
If I remove the two line of @OneToMany and @JoinColumn, things go well.

| Field | Type | Null | Key | Default | Extra |
| id | varchar(255) | NO | PRI | NULL | |
| name | varchar(255) | YES | | NULL | |
| pid | varchar(255) | YES | | NULL | |

The code:

And the Exception:

Anyone can give me some help? Thanks
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