2 files changed, 33 insertions, 1 deletions
diff --git a/src/main/java/org/traccar/helper/ClassScanner.java b/src/main/java/org/traccar/helper/ClassScanner.java
index c928f6a12..c201d101f 100644
--- a/src/main/java/org/traccar/helper/ClassScanner.java
+++ b/src/main/java/org/traccar/helper/ClassScanner.java
@@ -46,7 +46,7 @@ public final class ClassScanner {
         URL packageUrl = baseClass.getClassLoader().getResource(packagePath);
 
         if (packageUrl.getProtocol().equals("jar")) {
-            String jarFileName = URLDecoder.decode(packageUrl.getFile(), StandardCharsets.UTF_8.name());
+            String jarFileName = URLDecoder.decode(packageUrl.getFile(), StandardCharsets.UTF_8);
             try (JarFile jf = new JarFile(jarFileName.substring(5, jarFileName.indexOf("!")))) {
                 Enumeration<JarEntry> jarEntries = jf.entries();
                 while (jarEntries.hasMoreElements()) {
diff --git a/src/main/java/org/traccar/helper/StringUtil.java b/src/main/java/org/traccar/helper/StringUtil.java
new file mode 100644
index 000000000..9b4d717f4
--- /dev/null
+++ b/src/main/java/org/traccar/helper/StringUtil.java
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2023 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.helper;
+
+public final class StringUtil {
+
+    private StringUtil() {
+    }
+
+    public static boolean containsHex(String value) {
+        for (char c : value.toCharArray()) {
+            if (c >= 'a' && c <= 'f' || c >= 'A' && c <= 'F') {
+                return true;
+            }
+        }
+        return false;
+    }
+
+}