diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ea7e42d3a..2c4470569 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -24,14 +24,14 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Cache gradle dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-caches-${{ hashFiles('**/*.gradle') }}
           restore-keys: |
             ${{ runner.os }}-gradle-caches-
       - name: Cache gradle wrapper
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/.gradle/wrapper
           key: ${{ runner.os }}-gradle-wrapper-${{ hashFiles('**/gradle/wrapper/gradle-wrapper.properties') }}
@@ -43,7 +43,7 @@ jobs:
         run: ./gradlew build
       - name: Upload test results
         if: ${{ failure() }}
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           path: build/reports/tests/test
           name: Test Report
\ No newline at end of file
diff --git a/util/src/main/java/com/epam/deltix/util/lang/JarScanner.java b/util/src/main/java/com/epam/deltix/util/lang/JarScanner.java
index 64ba3fb53..724fea368 100644
--- a/util/src/main/java/com/epam/deltix/util/lang/JarScanner.java
+++ b/util/src/main/java/com/epam/deltix/util/lang/JarScanner.java
@@ -17,7 +17,6 @@
 package com.epam.deltix.util.lang;
 
 import javax.tools.JavaFileObject;
-import java.io.File;
 import java.io.IOException;
 import java.net.JarURLConnection;
 import java.net.URI;
@@ -59,7 +58,7 @@ private static Collection<JavaFileObject> listUnder(String packageName, URL pack
     }
 
     private static List<JavaFileObject> processJar(String packageName, URL packageFolderURL) {
-        List<JavaFileObject> result = new ArrayList<JavaFileObject>();
+        List<JavaFileObject> result = new ArrayList<>();
         try {
             String[] uris = packageFolderURL.toExternalForm().split("!");
             String jarUri = uris[0];
@@ -87,6 +86,9 @@ private static List<JavaFileObject> processJar(String packageName, URL packageFo
             } else if (secondUri.endsWith(".jar")) {
                 JarURLConnection jarConn = (JarURLConnection) packageFolderURL.openConnection();
                 String rootEntryName = jarConn.getEntryName();
+                if (rootEntryName == null) {
+                    rootEntryName = "";
+                }
                 int rootEnd = rootEntryName.length() + 1;
                 if (!secondUri.endsWith("jar"))
                     return result;