diff --git a/core/src/main/java/cc/carm/plugin/minesql/util/DBPropertiesUtil.java b/core/src/main/java/cc/carm/plugin/minesql/util/DBPropertiesUtil.java
index 86d28b7..ef4e454 100644
--- a/core/src/main/java/cc/carm/plugin/minesql/util/DBPropertiesUtil.java
+++ b/core/src/main/java/cc/carm/plugin/minesql/util/DBPropertiesUtil.java
@@ -17,7 +17,7 @@ public class DBPropertiesUtil {
         if (!propertiesFolder.exists() || !propertiesFolder.isDirectory()) return propertiesMap;
 
         File[] files = propertiesFolder.listFiles();
-        if (files == null || files.length == 0) return propertiesMap;
+        if (files == null) return propertiesMap;
         for (File file : files) {
             if (!validateName(file.getName())) continue;
             String name = file.getName().substring(0, file.getName().lastIndexOf("."));
diff --git a/core/src/main/java/cc/carm/plugin/minesql/util/MavenReadUtil.java b/core/src/main/java/cc/carm/plugin/minesql/util/MavenReadUtil.java
deleted file mode 100644
index e091441..0000000
--- a/core/src/main/java/cc/carm/plugin/minesql/util/MavenReadUtil.java
+++ /dev/null
@@ -1,45 +0,0 @@
-package cc.carm.plugin.minesql.util;
-
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.io.InputStream;
-import java.util.Properties;
-
-public class MavenReadUtil {
-
-    public static String getMavenPropertiesPath(@NotNull String groupID, @NotNull String artifactID) {
-        return String.format("/META-INF/maven/%s/%s/pom.properties", groupID, artifactID);
-    }
-
-    public static synchronized @Nullable String getVersion(@NotNull Object provider,
-                                                           @NotNull String groupID,
-                                                           @NotNull String artifactID) {
-        String path = getMavenPropertiesPath(groupID, artifactID);
-        String version = null;
-        // Using maven properties to get the version
-        try (InputStream is = provider.getClass().getResourceAsStream(path)) {
-            if (is != null) {
-                Properties p = new Properties();
-                p.load(is);
-                version = p.getProperty("version", "");
-            }
-        } catch (Exception ignored) {
-        }
-
-        if (version != null) return version;
-
-        // Fine, lets try Java API
-        Package pkg = provider.getClass().getPackage();
-        if (pkg != null) {
-            version = pkg.getImplementationVersion();
-            if (version == null) {
-                version = pkg.getSpecificationVersion();
-            }
-        }
-
-        return version;
-    }
-
-
-}