[hibernate-issues] [Hibernate-JIRA] Created: (HBX-1146) hbm2java should generate POJO entities with stable property order to ease development cycle

[Julien Kronegg (JIRA)]

hbm2java should generate POJO entities with stable property order to ease development cycle
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                 Key: HBX-1146
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HBX-1146
             Project: Hibernate Tools
          Issue Type: New Feature
          Components: hbm2java
    Affects Versions: 3.2.2
         Environment: Hibernate Tools 3.2.2, Seam 2.1.2, DB2
            Reporter: Julien Kronegg
            Priority: Minor
         Attachments: patch_EntityPOJOClass.txt

When generating entities using Hibernate hbm2java Ant task, the POJO annotated entity properties are not generated in the same order at each run. This is because the POJO properties are stored in data structures that do not have a given order (e.g. a java.util.Set).

Not having the same property order at each run is painful for the programmer: the property order of the new entity file is not the same of the previous version, which requires merging the two files. The merge operation duration could be reduced if the properties were generated in the same order at each run.

This is very important for projects that use an incremental development cycle where the database tables structure are often modified (e.g. adding a column, changing a column type).

The patch "patch_EntityPOJOClass.txt" gives a solution based on the org.hibernate.tool.hbm2x.pojo.EntityPOJOClass class. The Entity properties are sorted by the following types:
    1. identifier
    2. simple properties
    3. many-to-one properties
    4. Collections
Within a given property type, properties are sorted alphabetically by their property name.

This patch also solves the same issue in other generated files, such as Seam's EntityHome and EntityList.



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