tpalfy commented on a change in pull request #3894: NIFI-6884 - Native library
loading fixed/improved
URL: https://github.com/apache/nifi/pull/3894#discussion_r349527062
##########
File path:
nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-nar-utils/src/main/java/org/apache/nifi/nar/NarClassLoader.java
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@@ -205,26 +216,41 @@ private void updateClasspath(File root) throws
IOException {
}
@Override
- protected String findLibrary(final String libname) {
+ public String findLibrary(String libname) {
Review comment:
The problem is that the abstract `ClassLoader` has an implementation
returning null that takes precedent over the interface's default implementation.
But I guess this ties back to the bigger question of wether is it even a
good idea to use an interface as a trait instead of a member or an abstract
superclass. (I give my opinion on that on that specific comment.)
(Actually `ClassLoader` defines `findLibrary` as _protected_, which left
alone wouldn't even compile because it would mean it would try to override the
visibility of the _public_ definition of the interface. This actually points
out a weakness of the trait interface approach. Had the ClassLoader defined the
`findLibrary` as public, it would have been easy to simply leave out this call
to the interface - as it would have compiled but wouldn't have worked properly
as it would have returned null.)
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