diff --git a/pf4j/src/main/java/org/pf4j/PropertiesPluginDescriptorFinder.java b/pf4j/src/main/java/org/pf4j/PropertiesPluginDescriptorFinder.java
index 3e9e1c1..31afee9 100644
--- a/pf4j/src/main/java/org/pf4j/PropertiesPluginDescriptorFinder.java
+++ b/pf4j/src/main/java/org/pf4j/PropertiesPluginDescriptorFinder.java
@@ -36,7 +36,16 @@ public class PropertiesPluginDescriptorFinder implements PluginDescriptorFinder
 
     private static final Logger log = LoggerFactory.getLogger(PropertiesPluginDescriptorFinder.class);
 
-    private static final String DEFAULT_PROPERTIES_FILE_NAME = "plugin.properties";
+    public static final String DEFAULT_PROPERTIES_FILE_NAME = "plugin.properties";
+
+    public static final String PLUGIN_ID = "plugin.id";
+    public static final String PLUGIN_DESCRIPTION = "plugin.description";
+    public static final String PLUGIN_CLASS = "plugin.class";
+    public static final String PLUGIN_VERSION = "plugin.version";
+    public static final String PLUGIN_PROVIDER = "plugin.provider";
+    public static final String PLUGIN_DEPENDENCIES = "plugin.dependencies";
+    public static final String PLUGIN_REQUIRES = "plugin.requires";
+    public static final String PLUGIN_LICENSE = "plugin.license";
 
     protected String propertiesFileName;
 
@@ -98,38 +107,38 @@ public class PropertiesPluginDescriptorFinder implements PluginDescriptorFinder
         DefaultPluginDescriptor pluginDescriptor = createPluginDescriptorInstance();
 
         // TODO validate !!!
-        String id = properties.getProperty("plugin.id");
+        String id = properties.getProperty(PLUGIN_ID);
         pluginDescriptor.setPluginId(id);
 
-        String description = properties.getProperty("plugin.description");
+        String description = properties.getProperty(PLUGIN_DESCRIPTION);
         if (StringUtils.isNullOrEmpty(description)) {
             pluginDescriptor.setPluginDescription("");
         } else {
             pluginDescriptor.setPluginDescription(description);
         }
 
-        String clazz = properties.getProperty("plugin.class");
+        String clazz = properties.getProperty(PLUGIN_CLASS);
         if (StringUtils.isNotNullOrEmpty(clazz)) {
             pluginDescriptor.setPluginClass(clazz);
         }
 
-        String version = properties.getProperty("plugin.version");
+        String version = properties.getProperty(PLUGIN_VERSION);
         if (StringUtils.isNotNullOrEmpty(version)) {
             pluginDescriptor.setPluginVersion(version);
         }
 
-        String provider = properties.getProperty("plugin.provider");
+        String provider = properties.getProperty(PLUGIN_PROVIDER);
         pluginDescriptor.setProvider(provider);
 
-        String dependencies = properties.getProperty("plugin.dependencies");
+        String dependencies = properties.getProperty(PLUGIN_DEPENDENCIES);
         pluginDescriptor.setDependencies(dependencies);
 
-        String requires = properties.getProperty("plugin.requires");
+        String requires = properties.getProperty(PLUGIN_REQUIRES);
         if (StringUtils.isNotNullOrEmpty(requires)) {
             pluginDescriptor.setRequires(requires);
         }
 
-        pluginDescriptor.setLicense(properties.getProperty("plugin.license"));
+        pluginDescriptor.setLicense(properties.getProperty(PLUGIN_LICENSE));
 
         return pluginDescriptor;
     }
diff --git a/pf4j/src/test/java/org/pf4j/PropertiesPluginDescriptorFinderTest.java b/pf4j/src/test/java/org/pf4j/PropertiesPluginDescriptorFinderTest.java
index a65c84e..2be2eb8 100644
--- a/pf4j/src/test/java/org/pf4j/PropertiesPluginDescriptorFinderTest.java
+++ b/pf4j/src/test/java/org/pf4j/PropertiesPluginDescriptorFinderTest.java
@@ -43,25 +43,25 @@ public class PropertiesPluginDescriptorFinderTest {
     @BeforeEach
     public void setUp() throws IOException {
         Path pluginPath = Files.createDirectories(pluginsPath.resolve("test-plugin-1"));
-        storePropertiesToPath(getPlugin1Properties(), pluginPath.resolve("plugin.properties"));
+        storePropertiesToPath(getPlugin1Properties(), pluginPath);
 
         pluginPath = Files.createDirectories(pluginsPath.resolve("test-plugin-2"));
-        storePropertiesToPath(getPlugin2Properties(), pluginPath.resolve("plugin.properties"));
+        storePropertiesToPath(getPlugin2Properties(), pluginPath);
 
         // empty plugin
         Files.createDirectories(pluginsPath.resolve("test-plugin-3"));
 
         // no plugin class
         pluginPath = Files.createDirectories(pluginsPath.resolve("test-plugin-4"));
-        storePropertiesToPath(getPlugin4Properties(), pluginPath.resolve("plugin.properties"));
+        storePropertiesToPath(getPlugin4Properties(), pluginPath);
 
         // no plugin version
         pluginPath = Files.createDirectories(pluginsPath.resolve("test-plugin-5"));
-        storePropertiesToPath(getPlugin5Properties(), pluginPath.resolve("plugin.properties"));
+        storePropertiesToPath(getPlugin5Properties(), pluginPath);
 
         // no plugin id
         pluginPath = Files.createDirectories(pluginsPath.resolve("test-plugin-6"));
-        storePropertiesToPath(getPlugin6Properties(), pluginPath.resolve("plugin.properties"));
+        storePropertiesToPath(getPlugin6Properties(), pluginPath);
 
         versionManager = new DefaultVersionManager();
     }
@@ -105,63 +105,64 @@ public class PropertiesPluginDescriptorFinderTest {
 
     private Properties getPlugin1Properties() {
         Properties properties = new Properties();
-        properties.setProperty("plugin.id", "test-plugin-1");
-        properties.setProperty("plugin.version", "0.0.1");
-        properties.setProperty("plugin.description", "Test Plugin 1");
-        properties.setProperty("plugin.provider", "Decebal Suiu");
-        properties.setProperty("plugin.class", "org.pf4j.plugin.TestPlugin");
-        properties.setProperty("plugin.dependencies", "test-plugin-2,test-plugin-3@~1.0");
-        properties.setProperty("plugin.requires", ">=1");
-        properties.setProperty("plugin.license", "Apache-2.0");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_ID, "test-plugin-1");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_VERSION, "0.0.1");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_DESCRIPTION, "Test Plugin 1");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_PROVIDER, "Decebal Suiu");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_CLASS, "org.pf4j.plugin.TestPlugin");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_DEPENDENCIES, "test-plugin-2,test-plugin-3@~1.0");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_REQUIRES, ">=1");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_LICENSE, "Apache-2.0");
 
         return properties;
     }
 
     private Properties getPlugin2Properties() {
         Properties properties = new Properties();
-        properties.setProperty("plugin.id", "test-plugin-2");
-        properties.setProperty("plugin.version", "0.0.1");
-        properties.setProperty("plugin.provider", "Decebal Suiu");
-        properties.setProperty("plugin.class", "org.pf4j.plugin.TestPlugin");
-        properties.setProperty("plugin.dependencies", "");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_ID, "test-plugin-2");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_VERSION, "0.0.1");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_PROVIDER, "Decebal Suiu");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_CLASS, "org.pf4j.plugin.TestPlugin");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_DEPENDENCIES, "");
 
         return properties;
     }
 
     private Properties getPlugin4Properties() {
         Properties properties = new Properties();
-        properties.setProperty("plugin.id", "test-plugin-2");
-        properties.setProperty("plugin.version", "0.0.1");
-        properties.setProperty("plugin.provider", "Decebal Suiu");
-        properties.setProperty("plugin.dependencies", "");
-        properties.setProperty("plugin.requires", "*");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_ID, "test-plugin-2");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_VERSION, "0.0.1");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_PROVIDER, "Decebal Suiu");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_DEPENDENCIES, "");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_REQUIRES, "*");
 
         return properties;
     }
 
     private Properties getPlugin5Properties() {
         Properties properties = new Properties();
-        properties.setProperty("plugin.id", "test-plugin-2");
-        properties.setProperty("plugin.provider", "Decebal Suiu");
-        properties.setProperty("plugin.class", "org.pf4j.plugin.TestPlugin");
-        properties.setProperty("plugin.dependencies", "");
-        properties.setProperty("plugin.requires", "*");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_ID, "test-plugin-2");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_PROVIDER, "Decebal Suiu");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_CLASS, "org.pf4j.plugin.TestPlugin");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_DEPENDENCIES, "");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_REQUIRES, "*");
 
         return properties;
     }
 
     private Properties getPlugin6Properties() {
         Properties properties = new Properties();
-        properties.setProperty("plugin.version", "0.0.1");
-        properties.setProperty("plugin.provider", "Decebal Suiu");
-        properties.setProperty("plugin.class", "org.pf4j.plugin.TestPlugin");
-        properties.setProperty("plugin.dependencies", "");
-        properties.setProperty("plugin.requires", "*");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_VERSION, "0.0.1");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_PROVIDER, "Decebal Suiu");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_CLASS, "org.pf4j.plugin.TestPlugin");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_DEPENDENCIES, "");
+        properties.setProperty(PropertiesPluginDescriptorFinder.PLUGIN_REQUIRES, "*");
 
         return properties;
     }
 
-    private void storePropertiesToPath(Properties properties, Path path) throws IOException {
+    private void storePropertiesToPath(Properties properties, Path pluginPath) throws IOException {
+        Path path = pluginPath.resolve(PropertiesPluginDescriptorFinder.DEFAULT_PROPERTIES_FILE_NAME);
         try (Writer writer = new OutputStreamWriter(new FileOutputStream(path.toFile()), StandardCharsets.UTF_8)) {
             properties.store(writer, "");
         }