Fixes #62

[gneuvill]

Of course, there is still http://dilbert.com/strip/2001-10-25 , but anyway com.sun.tools.javac is definitely not thread safe so using parallel streams in annotation processors doesn't seem like a good idea...

[codecov-io]

Codecov Report

Merging #64 into master will not impact coverage.

@@           Coverage Diff            @@
##             master     #64   +/-   ##
========================================
  Coverage      4.93%   4.93%           
- Complexity        0      35   +35     
========================================
  Files            44      44           
  Lines          2208    2208           
  Branches        182     125   -57     
========================================
  Hits            109     109           
  Misses         2094    2094           
  Partials          5       5

Impacted Files	Coverage Δ	Complexity Δ
...java/org/derive4j/processor/DerivingProcessor.java	0% <ø> (ø)	0 <ø> (ø)	❌

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[jbgi]

if java.lang.model is not thread-safe I think it is a jdk bug. but anyway I think the bug is only when loading new jar, and this happen in only one place I think, in DeriveConfigBuilder.findDeriveConfig .
So before we disable parallelization completely, could you try to add a .sequential() just before
.flatMap(e -> deriveConfigBuilder.findDeriveConfig((TypeElement) e)) at this line and see if it fix the problem?

[gneuvill]

Since the bug occurs at random, I cannot give you a definitive answer (hence the Dilbert reference), but yes, it seems to be an efficient fix...

[jbgi]

After some experiments, I went with the strategy of disabling most parallelization (except for the initial discovery of all classes of the round) because there was other places were jar loading could occur.

[gneuvill]

I went with the strategy of disabling most parallelization

That seems the wisest... Thanks !