Showing posts with label JPA. Show all posts
Showing posts with label JPA. Show all posts

Thursday, October 30, 2014

How to Map a list of strings with JPA/Hibernate annotations ?

Yesterday while working on my project, I got one requirement where I need to store list of Array into the database, I checked on Google, went through various site but didn't get much information. Everyone talks about creating new entity and do onetomany relationship BUT I wanted to create a collection of basic types.

Finally I come across @ElementCollection annotation provided by JPA 2.0 which resolves my problem.

Problem :
Input JSON which we need to store in DB:

"schemas": ["urn:scim:schemas:core:1.0", "urn:scim:schemas:extension:enterprise:1.0"]
           Where schemas is Array of String.
Solution :

Just add following annotation in your POJO i,e
@CollectionTable(name = "SCIM_SCHEMAS", joinColumns = @JoinColumn(name = "SCHEMA_ID"))
@Column(name = "SCIM_SCHEMA")
private List<String> schemas;

It will create the table named "SCIM_SCHEMAS" having columns 'SCHEMA_ID' and 'SCIM_SCHEMA'

For details check section Collection of basic types or embeddable objects or feel free to comment :)

Thursday, October 9, 2014

Hibernate Error - Caused by: org.hibernate.DuplicateMappingException: duplicate import:

In hibernate, You cannot have two classes with the same name in the same or different packages else you will get an error at runtime like

"Caused by: org.hibernate.DuplicateMappingException: duplicate import: ....(try using auto-import="false")"

I have resolved this issue by adding property name on the Entity annotation.
Let us suppose I have Meta class in two different packages "com.database.user" and "', you can resolve it as :
package com.database.user
@Entity(name= "com.database.user")
public class Meta

@Entity(name= "")
public class Meta

There must be some other ways too to resolve this issue, So please feel free to share it :)

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