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Subject: Re: LinkageError woes
From: David Blevins <david.blevins@gmail.com>
In-Reply-To: <6E6249FE-D79A-4269-9ECC-8ACBE10BE688@gmail.com>
Date: Tue, 10 May 2011 18:57:06 -0700
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On May 10, 2011, at 5:56 PM, Kevan Miller wrote:

>=20
> On May 10, 2011, at 8:19 PM, David Blevins wrote:
>=20
>>=20
>> On May 10, 2011, at 3:48 PM, Kevan Miller wrote:
>>=20
>>>=20
>>> On May 10, 2011, at 5:08 PM, Kevan Miller wrote:
>>>=20
>>>>=20
>>>> On May 10, 2011, at 3:54 PM, David Blevins wrote:
>>>>=20
>>>>> Running out of places to perform our LinkageError hack.
>>>>>=20
>>>>> We've been doing the "try again" routine on all our code (xbean, =
openwebbeans, etc) and it seems we've followed that path as far as it =
will lead us.  Currently stuck at the following with no good ideas on =
how to work around it.
>>>>=20
>>>> Yuck. Thanks for getting us this far!
>>>>=20
>>>> For some reason, I had the notion that this was all going to be =
resolved by moving up to the latest OpenJPA release. Obviously, I was =
mis-guided (at best) and definitely hadn't gotten to the test validation =
stage.=20
>>>>=20
>>>> I guess OpenJPA would be where I might hope we could resolve... I =
can try banging my head against the wall for a bit...
>>>=20
>>> Well, one reason why OpenJPA wouldn't help resolve is if OpenJPA =
weren't involved... Hmph.
>>>=20
>>> If my memory is correct, this will work on Felix...
>>=20
>> Indeed it seems like an Equinox issue.
>>=20
>> Tried a hack involving wrapping the classloader with one that =
double-tries loadClass if a LinkageError is thrown.  Didn't work.  Might =
have needed to have done the hack a little deeper -- I just did the =
wrapping in TomcatWebAppContext.
>>=20
>> At the moment trying to find at least some dirty hack that will let =
me get far enough to see if the test will pass sans this issue.  Current =
hack idea: eagerly load all annotation classes.
>=20
> Started looking at Equinox code a bit. Also sent of a question. See =
who gets there first...

Eagerly loading annotation classes alone didn't do the trick.  Loading =
*all* the classes does work and results in all 5 persistence tests to =
pass.

I have a hunch that eagerly loading annotations *and* enums might do the =
trick.  Going to see if that is the case as that might give us more =
information about the issue and potentially a workaround that might be =
one we can stomach.  Loading all the classes eagerly is not ok, but =
eagerly loading annotation and enum classes might be livable till we can =
find the real issue.

-David