hibernate - fetch type in JPA -


i'm using jpa, jboss 7a.. old problem don't show of code , stacktrack caused by: org.hibernate.loader.multiplebagfetchexception: cannot simultaneously fetch multiple bags error caused code in entity:

@manytomany(fetch=fetchtype.eager)     @jointable(         name="post_rel_component"         , joincolumns={             @joincolumn(name="post_post_id", nullable=false)             }         , inversejoincolumns={             @joincolumn(name="component_component_id", nullable=false)             }         )     private list<component> components;      //bi-directional many-to-one association user     @manytoone     @joincolumn(name="post_username", nullable=false)     private user user;      //bi-directional many-to-many association tag     @manytomany(mappedby="posts", fetch=fetchtype.eager)     private list<tag> tags;

i found 3 solutions overcome problem on internet. fixed changing private list<tag> tags private set<tag> tags. don't understand causes problem. of webpages show how fix don't mention causes problem. can show why? thanks.

this due hibernate specific bug https://hibernate.atlassian.net/browse/hhh-1718 not exist in other jpa providers. quick read of bug suggests limitation joining 2 collections/lists, occurs default when marking collections eager. bug lists other workarounds.


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