Try to load C extension from the lib directory

RubyGems 3.4 removes the contents of `ext/` under installation. JRuby should look for the extension under `lib/` instead.
appsignal · Jan 3, 2023 · 1443e05 · 1443e05
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diff --git a/.changesets/attempt-to-load-c-extension-from-lib--directory.md b/.changesets/attempt-to-load-c-extension-from-lib--directory.md
@@ -0,0 +1,8 @@
+---
+bump: "patch"
+type: "fix"
+---
+
+Attempt to load C extension from lib/ directory. Fixes an issue where JRuby would fail to load
+the extension from the ext/ directory, as the directory is cleaned after installation when using
+RubyGems 3.4.0.
diff --git a/lib/appsignal/extension/jruby.rb b/lib/appsignal/extension/jruby.rb
@@ -50,7 +50,12 @@ def self.lib_extension
       end
 
       begin
-        ffi_lib File.join(File.dirname(__FILE__), "../../../ext/libappsignal.#{lib_extension}")
+        begin
+          # RubyGems will install the extension in the gem's lib directory.
+          ffi_lib File.join(File.dirname(__FILE__), "../../../lib/libappsignal.#{lib_extension}")
+        rescue LoadError
+          ffi_lib File.join(File.dirname(__FILE__), "../../../ext/libappsignal.#{lib_extension}")
+        end
         typedef AppsignalString.by_value, :appsignal_string
 
         attach_function :appsignal_start, [], :void