Inheritance with abstract classes in Hibernate -

i have following situation, article can have several types of content (e.g. text, images, sourcecode, ...). therefore designed simple class structure:

this source of abstract articlecontent class:

@entity @table( name = "article_contents" ) @inheritance( strategy = inheritancetype.table_per_class ) public abstract class articlecontent extends abstractentity {    private article article;    @manytoone   @joincolumn( name = "article_id", nullable = false, updatable = false )   public article getarticle() {     return article;   }    public void setarticle( article article ) {     this.article = article;   }    @column( name = "content", columndefinition = "text", nullable = false )   public abstract string getcontent();    public abstract void setcontent( string content );  } 

the getcontent() , setcontent() methods marked abstract, because return content displayed (e.g. plain text, <img src="..." />, ...).

i started implementation of textarticlecontent class. class stores content in string:

@entity @table( name = "text_article_contents" ) @attributeoverrides( { @attributeoverride( name = "content", column = @column( name = "content" ) ) } ) public class textarticlecontent extends articlecontent {    private string content;    @override   public string getcontent() {     return content;   }    @override   public void setcontent( string content ) {     this.content = content;   } 

}

this error output receive:

caused by: org.hibernate.mappingexception: repeated column in mapping entity: com.something.model.textarticlecontent column:    content (should mapped insert="false" update="false") 

though error messages gives me advice should (should mapped insert="false" update="false"), honestly, started using hibernate have no idea how handle it.

update: solution solution problem needed change @column annotation of getcontent() method. correct annotation looks this:

@column( name = "content", columndefinition = "text", nullable = false, insertable = false, updatable = false ) public abstract string getcontent(); 

i had add insertable , updatable, means tip in exception not correct.

furthermore, needed change inheritancestrategy abstract articlecontent class. correct @inheritance annotation is:

@inheritance( strategy = inheritancetype.single_table ) 

for cosmetic reasons, @table annotation in textarticlecontent class can replaced with:

@discriminatorvalue( "text_article_content" ) 

this changes discriminator value in article_contents table text_article_content.

try change in articlecontent

    @column( name = "content", columndefinition = "text", nullable = false )   public abstract string getcontent(); 

to

        @column( name = "content", columndefinition = "text", nullable = false, insertable = false, updatable = false )       public abstract string getcontent(); 

update.

changed insertable, updatable.