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From Aristedes Maniatis <>
Subject Re: [jira] [Commented] (CAY-1622) Generated classes shouldn't produce serialVersionUID compiler warning
Date Tue, 04 Oct 2011 00:36:43 GMT
I find that the cgen task does not regenerate the files unless the cayenne model has an updated
datetime stamp. However, your point is taken that this will then cause ALL entities to get
a new serial number, even if only one changed.


On 4/10/11 10:53 AM, Mike Kienenberger wrote:
> No, it should be more clever than that.  Otherwise, every time you
> regenerate the template, the generated code will change even if
> nothing else had changed.   That will also break serialization.
> Ideally, it should return the same number whenever the same fields and
> types are used for the generated class.
> Maybe build the number by iterating over the attributes and
> relationships and feeding it into
> org.apache.commons.lang.builder.HashCodeBuilder, basing it on the
> order and type
> On Mon, Oct 3, 2011 at 7:41 PM, Ari Maniatis (Commented) (JIRA)
> <>  wrote:
>>     [
>> Ari Maniatis commented on CAY-1622:
>> -----------------------------------
>> Do we just want to add this to the velocity templates:
>> private static final long serialVersionUID = ${random(1,9223372036854775807)};
>>> Generated classes shouldn't produce serialVersionUID compiler warning
>>> ---------------------------------------------------------------------
>>>                  Key: CAY-1622
>>>                  URL:
>>>              Project: Cayenne
>>>           Issue Type: Bug
>>>           Components: Core Library
>>>     Affects Versions: 3.0
>>>             Reporter: Bob Harner
>>>             Priority: Minor
>>> It is probably a good idea for Cayenne not to produce any compiler warnings,
but auto-generated entity classes always have the "The serializable class _Foo does not declare
a static final serialVersionUID field of type long" compiler warning.
>>> The @SuppressWarnings("serial") annotation will get rid of the warnings, but
of course it is not recommended to manually update the generated  classes.
>>> Users could configure the IDE to ignore these warnings (yuk), but then other
team members will still see them.
>>> Another option is to for users to set up a custom velocity template to include
this annotation.
>>> But the best solution would be for Cayenne to either automatically generate either
the serialVersionUID itself or the @SuppressWarnings("serial") annotation that suppresses
the compiler warning.
>> --
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Aristedes Maniatis
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