Minor improvements

pf4j/src/main/java/ro/fortsoft/pf4j/DefaultPluginDescriptorFinder.java

@@ -51,7 +51,7 @@ public class DefaultPluginDescriptorFinder extends ManifestPluginDescriptorFinde
         Path manifestPath = pluginPath.resolve(Paths.get(classes,"/META-INF/MANIFEST.MF"));
         log.debug("Lookup plugin descriptor in '{}'", manifestPath);
         if (Files.notExists(manifestPath)) {
-            throw new PluginException("Cannot find '" + manifestPath + "' path");
+            throw new PluginException("Cannot find '{}' path", manifestPath);
         }
 
         try (InputStream input = Files.newInputStream(manifestPath)) {

pf4j/src/main/java/ro/fortsoft/pf4j/DependencyResolver.java

@@ -71,7 +71,7 @@ public class DependencyResolver {
 		List<String> pluginsId = dependenciesGraph.reverseTopologicalSort();
 
 		if (pluginsId == null) {
-			throw new PluginException("Cyclic dependencies !!!" + dependenciesGraph.toString());
+			throw new PluginException("Cyclic dependencies !!! {}", dependenciesGraph.toString());
 		}
 
 		log.debug("Plugins order: {}", pluginsId);

pf4j/src/main/java/ro/fortsoft/pf4j/PluginManager.java

@@ -178,5 +178,6 @@ public interface PluginManager {
      * Gets the path of the folder where plugins are installed
      * @return Path of plugins root
      */
-    public Path getPluginsRoot();
+    Path getPluginsRoot();
+
 }

pf4j/src/main/java/ro/fortsoft/pf4j/PropertiesPluginDescriptorFinder.java

@@ -59,7 +59,7 @@ public class PropertiesPluginDescriptorFinder implements PluginDescriptorFinder
         Path propertiesPath = pluginPath.resolve(Paths.get(propertiesFileName));
         log.debug("Lookup plugin descriptor in '{}'", propertiesPath);
         if (Files.notExists(propertiesPath)) {
-            throw new PluginException("Cannot find '" + pluginPath + "' path");
+            throw new PluginException("Cannot find '{}' path", pluginPath);
         }
 
         Properties properties = new Properties();