Fix connection has already been closed (#544)

* Fixed a MySQL issue: connection has already been closed.

* Fixed import

Author: Squesly

api/src/main/java/xyz/jonesdev/sonar/api/database/controller/VerifiedPlayerController.java

@@ -20,7 +20,7 @@
 import com.alessiodp.libby.LibraryManager;
 import com.j256.ormlite.dao.Dao;
 import com.j256.ormlite.dao.DaoManager;
-import com.j256.ormlite.jdbc.JdbcConnectionSource;
+import com.j256.ormlite.jdbc.JdbcPooledConnectionSource;
 import com.j256.ormlite.stmt.QueryBuilder;
 import com.j256.ormlite.support.ConnectionSource;
 import com.j256.ormlite.table.TableUtils;
@@ -93,7 +93,7 @@ public VerifiedPlayerController(final @NotNull LibraryManager libraryManager) {
           "?autoReconnect=true");
       }
 
-      connectionSource = new JdbcConnectionSource(jdbcURL,
+      connectionSource = new JdbcPooledConnectionSource(jdbcURL,
         Sonar.get0().getConfig().getGeneralConfig().getString("database.username"),
         Sonar.get0().getConfig().getGeneralConfig().getString("database.password"),
         cachedDatabaseType.getDatabaseType());