This instrumented code fails to execute

[Giovanni Lovato]

This code:

var reflections = new Reflections("my.package");
var types = reflections
    .getTypesAnnotatedWith(GenerateMessages.class)
    .stream();
types.map(Class::getFields).flatMap(Stream::of)
    .forEach(field -> {
        try {
            String key = (String) field.get(null); // <- FAILS HERE
        } catch (IllegalArgumentException | IllegalAccessException e) {
            this.getLogger().error("Cannot access field", e);
        }
    });

fails when instrumented by Clover on the line commented with FAILS HERE. This is the thrown exception:

java.lang.ClassCastException: class com_atlassian_clover.TestNameSniffer$1 
    cannot be cast to class java.lang.String 
    (com_atlassian_clover.TestNameSniffer$1 is in unnamed module of loader 
    java.net.URLClassLoader @3141366; java.lang.String is in module java.base of loader 'bootstrap')

[Giovanni Lovato · Accepted solution]

I've just realized the code assumes that the fields of those classes are of type String, since that is the adopted convention in that project, but I assume Clover is adding other fields so I need to be more careful on casting!