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Editorial Team
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Asked: 2026-06-08T13:14:24+00:00

In a One To One mapping, I wrote the following lines of code. @GenericGenerator(name

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In a One To One mapping, I wrote the following lines of code.

@GenericGenerator(name = "generator", strategy = "foreign", parameters = @Parameter(name="property", value= "post"))
@Id
@GeneratedValue(generator = "generator")
public int getContent_id() {
    return content_id;
}

What is the significance of @Parameter(name=”property”, value= “post”). If I don’t write that line I’m getting an error

Invocation of init method failed; nested exception is org.hibernate.MappingException: Could not instantiate id generator [entity-name=in.codejava.personal.model.Content]

EDIT

When I changed the value = “post” to anything else like value=”post123″ etc it works. But it doesn’t work when I completely remove that. Partial Code http://pastebin.com/CjEpqtXV

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1 Answer

  1. Editorial Team

    It allows telling the generator from which property the ID must be extracted (in this case: “post”). An entity could have several OnetoOne associations. You need to tell it which one of them contains the ID of your entity.

    Note that this generator can be replaced by a standard JPA annotation on the OneToOne association containing the ID: @MapsId. The Hibernate documentation recommends its usage rather than the foreign generator.

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