diff --git a/pom.xml b/pom.xml
index 75f2a07..55ec92f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -31,7 +31,7 @@
 
     <groupId>io.github.elf4j</groupId>
     <artifactId>elf4j-impl-core</artifactId>
-    <version>0.5.5</version>
+    <version>0.5.6</version>
     <packaging>jar</packaging>
     <name>elf4j-impl-core</name>
     <description>Native logging service provider implementation of ELF4J (Easy Logging Facade For Java)
diff --git a/src/main/java/elf4j/impl/core/configuration/DefaultServiceConfiguration.java b/src/main/java/elf4j/impl/core/configuration/DefaultServiceConfiguration.java
index a2251cb..c7629bc 100644
--- a/src/main/java/elf4j/impl/core/configuration/DefaultServiceConfiguration.java
+++ b/src/main/java/elf4j/impl/core/configuration/DefaultServiceConfiguration.java
@@ -49,16 +49,12 @@ public class DefaultServiceConfiguration implements ServiceConfiguration {
      *
      */
     public DefaultServiceConfiguration() {
-        this(new PropertiesLoader());
-    }
-
-    DefaultServiceConfiguration(PropertiesLoader propertiesLoader) {
-        this.propertiesLoader = propertiesLoader;
-        setRepositories(propertiesLoader.load());
+        this.propertiesLoader = new PropertiesLoader();
+        setRepositories(this.propertiesLoader.load());
     }
 
     DefaultServiceConfiguration(LevelRepository levelRepository, WriterRepository writerRepository) {
-        this(new PropertiesLoader());
+        this.propertiesLoader = new PropertiesLoader();
         this.levelRepository = levelRepository;
         this.writerRepository = writerRepository;
     }
@@ -87,11 +83,10 @@ public void refresh(@Nullable Properties properties) {
     }
 
     private boolean loadLoggerConfigurationCache(NativeLogger nativeLogger) {
-        Level loggerMinimumLevel = levelRepository.getLoggerMinimumLevel(nativeLogger);
+        Level loggerConfigurationMinimumLevel = levelRepository.getLoggerMinimumLevel(nativeLogger);
         Level logServiceWriterMinimumLevel = writerRepository.getLogServiceWriter().getMinimumLevel();
-        int effectiveMinimumLevelOrdinal =
-                Math.max(loggerMinimumLevel.ordinal(), logServiceWriterMinimumLevel.ordinal());
-        return nativeLogger.getLevel().ordinal() >= effectiveMinimumLevelOrdinal;
+        return nativeLogger.getLevel().ordinal() >= Math.max(loggerConfigurationMinimumLevel.ordinal(),
+                logServiceWriterMinimumLevel.ordinal());
     }
 
     private void setRepositories(@NonNull Properties properties) {
diff --git a/src/main/java/elf4j/impl/core/configuration/LevelRepository.java b/src/main/java/elf4j/impl/core/configuration/LevelRepository.java
index f5ee15e..de6ac5c 100644
--- a/src/main/java/elf4j/impl/core/configuration/LevelRepository.java
+++ b/src/main/java/elf4j/impl/core/configuration/LevelRepository.java
@@ -37,7 +37,7 @@
  */
 public class LevelRepository {
     private static final Level DEFAULT_LOGGER_MINIMUM_LEVEL = Level.TRACE;
-    final Map<String, Level> loggerNameValueMap = new HashMap<>();
+    final Map<String, Level> loggerMinimumLevels = new HashMap<>();
 
     /**
      * @param properties configuration source of all minimum output levels for loggers
@@ -48,10 +48,11 @@ public LevelRepository(Properties properties) {
                 String[] nameSegments = name.split("@");
                 switch (nameSegments.length) {
                     case 1:
-                        loggerNameValueMap.put("", Level.valueOf(properties.getProperty("level").trim().toUpperCase()));
+                        loggerMinimumLevels.put("",
+                                Level.valueOf(properties.getProperty("level").trim().toUpperCase()));
                         break;
                     case 2:
-                        loggerNameValueMap.put(nameSegments[1].trim(),
+                        loggerMinimumLevels.put(nameSegments[1].trim(),
                                 Level.valueOf(properties.getProperty(name).trim().toUpperCase()));
                         break;
                     default:
@@ -68,9 +69,12 @@ public LevelRepository(Properties properties) {
     public Level getLoggerMinimumLevel(NativeLogger nativeLogger) {
         String callerClassName = nativeLogger.getName();
         int rootPackageLength = callerClassName.indexOf('.');
+        if (rootPackageLength == -1) {
+            rootPackageLength = callerClassName.length();
+        }
         while (callerClassName.length() >= rootPackageLength) {
-            if (loggerNameValueMap.containsKey(callerClassName)) {
-                return loggerNameValueMap.get(callerClassName);
+            if (loggerMinimumLevels.containsKey(callerClassName)) {
+                return loggerMinimumLevels.get(callerClassName);
             }
             if (callerClassName.length() == rootPackageLength) {
                 break;
@@ -81,7 +85,7 @@ public Level getLoggerMinimumLevel(NativeLogger nativeLogger) {
             }
             callerClassName = callerClassName.substring(0, end);
         }
-        Level configuredRootLevel = loggerNameValueMap.get("");
+        Level configuredRootLevel = loggerMinimumLevels.get("");
         return configuredRootLevel == null ? DEFAULT_LOGGER_MINIMUM_LEVEL : configuredRootLevel;
     }
 }
diff --git a/src/test/java/elf4j/impl/core/configuration/DefaultServiceConfigurationTest.java b/src/test/java/elf4j/impl/core/configuration/DefaultServiceConfigurationTest.java
index c98f846..aaf4c10 100644
--- a/src/test/java/elf4j/impl/core/configuration/DefaultServiceConfigurationTest.java
+++ b/src/test/java/elf4j/impl/core/configuration/DefaultServiceConfigurationTest.java
@@ -48,7 +48,7 @@ class DefaultServiceConfigurationTest {
     @Nested
     class isEnabled {
         @Test
-        void loadFromReposOnlyOnce() {
+        void cacheLoadFromReposOnlyOnce() {
             DefaultServiceConfiguration defaultLoggingConfiguration =
                     new DefaultServiceConfiguration(mockLevelRepository, mockWriterRepository);
             NativeLogger nativeLogger = new NativeLogger("test.owner.class.Name", Level.OFF, mockLogService);