improve logging

Author: infeo

src/main/java/org/cryptomator/integrations/common/ClassLoaderFactory.java

@@ -38,7 +38,7 @@ public static URLClassLoader forPluginDir() {
 			if (val.isBlank()) {
 				throw new IllegalArgumentException("Plugin dir path is blank");
 			}
-			return forPluginDirWithPath(Path.of(val)); //Path.of might throw InvalidPathException
+			return forPluginDirWithPath(Path.of(val)); //Path.of() might throw InvalidPathException
 		} catch (IllegalArgumentException e) {
 			LOG.debug("{} contains illegal value. Skipping plugin directory.", PLUGIN_DIR_KEY, e);
 			return URLClassLoader.newInstance(new URL[0]);
@@ -49,7 +49,7 @@ public static URLClassLoader forPluginDir() {
 	@Contract(value = "_ -> new", pure = true)
 	static URLClassLoader forPluginDirWithPath(Path path) throws UncheckedIOException {
 		var jars = findJars(path);
-		if (LOG.isDebugEnabled()) {
+		if (LOG.isDebugEnabled() && jars.length != 0) {
 			String jarList = Arrays.stream(jars).map(URL::getPath).collect(Collectors.joining(", "));
 			LOG.debug("Found jars in cryptomator.pluginDir: {}", jarList);
 		}
@@ -61,7 +61,7 @@ static URL[] findJars(Path path) {
 		try (var stream = Files.walk(path)) {
 			return stream.filter(ClassLoaderFactory::isJarFile).map(ClassLoaderFactory::toUrl).toArray(URL[]::new);
 		} catch (IOException | UncheckedIOException e) {
-			// unable to locate any jars // TODO: log a warning?
+			LOG.debug("Failed to read plugin dir {}", path, e);
 			return new URL[0];
 		}
 	}