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clojure-fn-compilation-issue-repro's Introduction

Reproducer for fn compilation issue

This project is a reproducer for the following issue: Given a Clojure function which references a class, if that class has a static field with an initializer which fails when run, the function will fail to compile because the compiler (needlessly) runs the initializer even if the respective field is not accessed.

See repro.fail namespace for an example. Here, the bar function references the io.netty.handler.codec.compression.BrotliOptions class. That class has a package-private static field named DEFAULT with an initializer. That initializer depends on a class which is provided by an optional third-party library. However, even though bar never references that field, the initializer gets run and fails because that library is not present.

Run it like this:

$ clojure -M -m repro.fail
Execution error (ClassNotFoundException) at jdk.internal.loader.BuiltinClassLoader/loadClass (BuiltinClassLoader.java:641).
com.aayushatharva.brotli4j.encoder.Encoder$Parameters

Workaround

The issue can be worked around by putting the class value into a separate def and using that in the function instead. See repro.ok. Run it like this:

$ clojure -M -m repro.ok
io.netty.handler.codec.compression.BrotliOptions

Relevance

The issue was encountered in the context of clj-commons/aleph#703

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