zabetak commented on pull request #2449:
URL: https://github.com/apache/calcite/pull/2449#issuecomment-939881009


   @birschick-bq when the method argument does not have an explicit annotation 
then CheckerFramework uses a default based on some 
[rules||https://checkerframework.org/manual/#climb-to-top] and in the case of 
`getDefaultCompilerFactory` it is `@NonNull`. Moverover looking into the source 
code of `getDefaultCompilerFactory` it seems that if `null` is given as an 
input it will fail with NPE.
   
   Regarding the `setParentClassLoader` method the `@Nullable` annotations used 
by Janino are not the same used with those used by the CheckerFramework. To 
align them we make use of `.astub` files.
   
   I resolved the problems in commit 
https://github.com/apache/calcite/pull/2449/commits/a0ef603257c274d445a0c1b117db8b1eb595ca5a.
 Please have a look and let me know what you think. If all is good I will 
rebase and commit afterwards.


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