diff --git a/test/jdk/java/util/Calendar/CalendarDisplayNamesTest.java b/test/jdk/java/util/Calendar/CalendarDisplayNamesTest.java
index 7c40714fc02..171bea55fcf 100644
--- a/test/jdk/java/util/Calendar/CalendarDisplayNamesTest.java
+++ b/test/jdk/java/util/Calendar/CalendarDisplayNamesTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -21,21 +21,21 @@
  * questions.
  */
 
-import org.testng.Assert;
-import org.testng.annotations.Test;
 
 import java.util.Calendar;
 import java.util.Locale;
 import java.util.Map;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
 
 /**
  * @test
  * @bug 8262108 8174269
  * @summary Verify the results returned by Calendar.getDisplayNames() API
  * @comment Locale providers: CLDR,SPI
- * @run testng/othervm -Djava.locale.providers=CLDR,SPI CalendarDisplayNamesTest
+ * @run junit/othervm -Djava.locale.providers=CLDR,SPI CalendarDisplayNamesTest
  * @comment Locale providers: default
- * @run testng CalendarDisplayNamesTest
+ * @run junit CalendarDisplayNamesTest
  */
 public class CalendarDisplayNamesTest {
 
@@ -55,7 +55,7 @@ public class CalendarDisplayNamesTest {
                     continue;
                 }
                 for (final Integer fieldValue : names.values()) {
-                    Assert.assertTrue(fieldValue == Calendar.AM || fieldValue == Calendar.PM,
+                    Assertions.assertTrue(fieldValue == Calendar.AM || fieldValue == Calendar.PM,
                             "Invalid field value " + fieldValue + " for calendar field AM_PM, in locale "
                                     + locale + " with style " + style);
                 }
diff --git a/test/jdk/java/util/Calendar/JapaneseLenientEraTest.java b/test/jdk/java/util/Calendar/JapaneseLenientEraTest.java
index 6a909a23a18..ca726afc29b 100644
--- a/test/jdk/java/util/Calendar/JapaneseLenientEraTest.java
+++ b/test/jdk/java/util/Calendar/JapaneseLenientEraTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,7 +25,7 @@
  * @test
  * @bug 8206120
  * @summary Test whether lenient era is accepted in JapaneseImperialCalendar
- * @run testng/othervm JapaneseLenientEraTest
+ * @run junit/othervm JapaneseLenientEraTest
  */
 
 import java.text.DateFormat;
@@ -34,15 +34,15 @@ import java.util.Calendar;
 import java.util.Date;
 import java.util.Locale;
 
-import org.testng.annotations.DataProvider;
-import org.testng.annotations.Test;
-import static org.testng.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
 
-@Test
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public class JapaneseLenientEraTest {
 
-    @DataProvider(name="lenientEra")
-    Object[][] names() {
+    Object[][] lenientEra() {
         return new Object[][] {
             // lenient era/year, strict era/year
             { "Meiji 123", "Heisei 2" },
@@ -51,7 +51,8 @@ public class JapaneseLenientEraTest {
         };
     }
 
-    @Test(dataProvider="lenientEra")
+    @ParameterizedTest
+    @MethodSource("lenientEra")
     public void testLenientEra(String lenient, String strict) throws Exception {
         Calendar c = new Calendar.Builder()
             .setCalendarType("japanese")
@@ -61,6 +62,6 @@ public class JapaneseLenientEraTest {
         Date lenDate = df.parse(lenient + "-01-01");
         df.setLenient(false);
         Date strDate = df.parse(strict + "-01-01");
-        assertEquals(lenDate, strDate);
+        assertEquals(strDate, lenDate);
     }
 }
diff --git a/test/jdk/java/util/Calendar/SupplementalJapaneseEraTestRun.java b/test/jdk/java/util/Calendar/SupplementalJapaneseEraTestRun.java
index 8eac4a97ef7..878955fdcc4 100644
--- a/test/jdk/java/util/Calendar/SupplementalJapaneseEraTestRun.java
+++ b/test/jdk/java/util/Calendar/SupplementalJapaneseEraTestRun.java
@@ -27,7 +27,7 @@
  * @summary Test for jdk.calendar.japanese.supplemental.era support
  * @library /test/lib
  * @build SupplementalJapaneseEraTest
- * @run testng/othervm SupplementalJapaneseEraTestRun
+ * @run junit/othervm SupplementalJapaneseEraTestRun
  */
 
 import java.util.Calendar;
@@ -45,11 +45,12 @@ import static java.util.Calendar.YEAR;
 import jdk.test.lib.process.ProcessTools;
 import jdk.test.lib.Utils;
 
-import org.testng.annotations.DataProvider;
-import org.testng.annotations.Test;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
 
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public class SupplementalJapaneseEraTestRun {
-    @DataProvider(name = "validprop")
     Object[][] validPropertyData() {
         return new Object[][] {
                 //Tests with valid property values
@@ -58,7 +59,6 @@ public class SupplementalJapaneseEraTestRun {
         };
     }
 
-    @DataProvider(name = "invalidprop")
     Object[][] invalidPropertyData() {
         return new Object[][] {
                 //Tests with invalid property values
@@ -76,7 +76,8 @@ public class SupplementalJapaneseEraTestRun {
         };
     }
 
-    @Test(dataProvider = "validprop")
+    @ParameterizedTest
+    @MethodSource("validPropertyData")
     public void ValidPropertyValuesTest(String prop)
             throws Throwable {
         //get the start time of the fictional next era
@@ -84,7 +85,8 @@ public class SupplementalJapaneseEraTestRun {
         testRun(prop + startTime, List.of("-t"));
     }
 
-    @Test(dataProvider = "invalidprop")
+    @ParameterizedTest
+    @MethodSource("invalidPropertyData")
     public void InvalidPropertyValuesTest(String prop)
             throws Throwable {
         //get the start time of the fictional next era
diff --git a/test/jdk/java/util/Properties/CompatibilityTest.java b/test/jdk/java/util/Properties/CompatibilityTest.java
index 29c7be6fbcd..839680806c1 100644
--- a/test/jdk/java/util/Properties/CompatibilityTest.java
+++ b/test/jdk/java/util/Properties/CompatibilityTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2020, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -24,19 +24,19 @@
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.util.Properties;
-import org.testng.Assert;
-
-import org.testng.annotations.DataProvider;
-import org.testng.annotations.Test;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
 
 /*
  * @test
  * @bug 8252354
- * @run testng CompatibilityTest
+ * @run junit CompatibilityTest
  * @summary Verify compatibility.
  */
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public class CompatibilityTest {
-    @DataProvider(name = "entries")
     public Object[][] getEntries() throws IOException {
         return new Object[][]{
             {8, 238923},
@@ -53,9 +53,10 @@ public class CompatibilityTest {
      * @param value the value
      * @throws IOException
      */
-    @Test(dataProvider = "entries")
+    @ParameterizedTest
+    @MethodSource("getEntries")
     void testThrows(Object key, Object value) throws IOException {
-        Assert.assertThrows(ClassCastException.class, () -> storeToXML(key, value));
+        Assertions.assertThrows(ClassCastException.class, () -> storeToXML(key, value));
     }
 
     void storeToXML(Object key, Object value) throws IOException {
diff --git a/test/jdk/java/util/Properties/EncodingTest.java b/test/jdk/java/util/Properties/EncodingTest.java
index d97730a37c7..069d16155f0 100644
--- a/test/jdk/java/util/Properties/EncodingTest.java
+++ b/test/jdk/java/util/Properties/EncodingTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -27,19 +27,20 @@ import java.io.IOException;
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 import java.util.Properties;
-import org.testng.Assert;
-import org.testng.annotations.DataProvider;
-import org.testng.annotations.Test;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
 
 /**
  * @test
  * @bug 8183743
  * @summary Test to verify the new overload method with Charset functions the
  * same as the existing method that takes a charset name.
- * @run testng EncodingTest
+ * @run junit EncodingTest
  */
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public class EncodingTest {
-    @DataProvider(name = "parameters")
     public Object[][] getParameters() throws IOException {
         return new Object[][]{
             {StandardCharsets.UTF_8.name(), null},
@@ -51,7 +52,8 @@ public class EncodingTest {
      * encoding name or a charset can be read with Properties#loadFromXML that
      * returns the same Properties object.
      */
-    @Test(dataProvider = "parameters")
+    @ParameterizedTest
+    @MethodSource("getParameters")
     void testLoadAndStore(String encoding, Charset charset) throws IOException {
         Properties props = new Properties();
         props.put("k0", "\u6C34");
@@ -74,6 +76,6 @@ public class EncodingTest {
             }
         }
 
-        Assert.assertEquals(props, p);
+        Assertions.assertEquals(p, props);
     }
 }
diff --git a/test/jdk/java/util/Properties/InitialCapacity.java b/test/jdk/java/util/Properties/InitialCapacity.java
index 81e5421bbef..d684c37adf4 100644
--- a/test/jdk/java/util/Properties/InitialCapacity.java
+++ b/test/jdk/java/util/Properties/InitialCapacity.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -22,18 +22,22 @@
  */
 
 import java.util.Properties;
-import org.testng.annotations.Test;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
 
 /*
  * @test
  * @bug 8189319
  * @summary Test that Properties(int initialCapacity) throws exceptions (or
             doesn't) as expected
- * @run testng InitialCapacity
+ * @run junit InitialCapacity
  */
 public class InitialCapacity {
-    @Test(expectedExceptions = IllegalArgumentException.class)
-    public void negativeInitCap() { Properties p = new Properties(-1); }
+    @Test
+    public void negativeInitCap() { Assertions.assertThrows(IllegalArgumentException.class, () -> {
+        Properties p = new Properties(-1);
+        });
+}
 
     @Test
     public void positiveInitCap() { Properties p = new Properties(10); }
diff --git a/test/jdk/java/util/Properties/PropertiesEntrySetTest.java b/test/jdk/java/util/Properties/PropertiesEntrySetTest.java
index d7d58be44dd..f3262f734e3 100644
--- a/test/jdk/java/util/Properties/PropertiesEntrySetTest.java
+++ b/test/jdk/java/util/Properties/PropertiesEntrySetTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2020, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -26,17 +26,17 @@
  * @bug        8245694
  * @summary    tests the entrySet() method of Properties class
  * @author     Yu Li
- * @run testng PropertiesEntrySetTest
+ * @run junit PropertiesEntrySetTest
  */
 
-import org.testng.annotations.Test;
 
 import java.util.Properties;
 
-import static org.testng.Assert.assertEquals;
-import static org.testng.Assert.assertFalse;
-import static org.testng.Assert.assertThrows;
-import static org.testng.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import org.junit.jupiter.api.Test;
 
 public class PropertiesEntrySetTest {
 
@@ -99,13 +99,13 @@ public class PropertiesEntrySetTest {
     public void testToString() {
         Properties a = new Properties();
         var aEntrySet = a.entrySet();
-        assertEquals(aEntrySet.toString(), "[]");
+        assertEquals("[]", aEntrySet.toString());
 
         a.setProperty("p1", "1");
-        assertEquals(aEntrySet.toString(), "[p1=1]");
+        assertEquals("[p1=1]", aEntrySet.toString());
 
         a.setProperty("p2", "2");
-        assertEquals(aEntrySet.size(), 2);
+        assertEquals(2, aEntrySet.size());
         assertTrue(aEntrySet.toString().trim().startsWith("["));
         assertTrue(aEntrySet.toString().contains("p1=1"));
         assertTrue(aEntrySet.toString().contains("p2=2"));
@@ -115,18 +115,18 @@ public class PropertiesEntrySetTest {
         b.setProperty("p2", "2");
         b.setProperty("p1", "1");
         var bEntrySet = b.entrySet();
-        assertEquals(bEntrySet.size(), 2);
+        assertEquals(2, bEntrySet.size());
         assertTrue(bEntrySet.toString().trim().startsWith("["));
         assertTrue(bEntrySet.toString().contains("p1=1"));
         assertTrue(bEntrySet.toString().contains("p2=2"));
         assertTrue(bEntrySet.toString().trim().endsWith("]"));
 
         b.setProperty("p0", "0");
-        assertEquals(bEntrySet.size(), 3);
+        assertEquals(3, bEntrySet.size());
         assertTrue(bEntrySet.toString().contains("p0=0"));
 
         b.remove("p1");
-        assertEquals(bEntrySet.size(), 2);
+        assertEquals(2, bEntrySet.size());
         assertFalse(bEntrySet.toString().contains("p1=1"));
         assertTrue(bEntrySet.toString().trim().startsWith("["));
         assertTrue(bEntrySet.toString().contains("p0=0"));
@@ -134,7 +134,7 @@ public class PropertiesEntrySetTest {
         assertTrue(bEntrySet.toString().trim().endsWith("]"));
 
         b.remove("p0", "0");
-        assertEquals(bEntrySet.size(), 1);
+        assertEquals(1, bEntrySet.size());
         assertFalse(bEntrySet.toString().contains("p0=0"));
         assertTrue(bEntrySet.toString().trim().startsWith("["));
         assertTrue(bEntrySet.toString().contains("p2=2"));
@@ -151,13 +151,13 @@ public class PropertiesEntrySetTest {
         a.setProperty("p1", "1");
         a.setProperty("p2", "2");
         var aEntrySet = a.entrySet();
-        assertEquals(aEntrySet.size(), 2);
+        assertEquals(2, aEntrySet.size());
 
         var i = aEntrySet.iterator();
         var e1 = i.next();
         i.remove();
         assertFalse(aEntrySet.contains(e1));
-        assertEquals(aEntrySet.size(), 1);
+        assertEquals(1, aEntrySet.size());
 
         var e2 = i.next();
         aEntrySet.remove(e2);
@@ -172,14 +172,14 @@ public class PropertiesEntrySetTest {
         var bEntrySet = b.entrySet();
 
         assertFalse(bEntrySet.containsAll(aEntrySet));
-        assertEquals(bEntrySet.size(), 2);
+        assertEquals(2, bEntrySet.size());
 
         assertTrue(bEntrySet.removeAll(aEntrySet));
-        assertEquals(bEntrySet.size(), 1);
+        assertEquals(1, bEntrySet.size());
 
         assertTrue(bEntrySet.retainAll(aEntrySet));
         assertTrue(bEntrySet.isEmpty());
-        assertEquals(aEntrySet.size(), 2);
+        assertEquals(2, aEntrySet.size());
 
         aEntrySet.clear();
         assertTrue(aEntrySet.isEmpty());
diff --git a/test/jdk/java/util/Properties/PropertiesStoreTest.java b/test/jdk/java/util/Properties/PropertiesStoreTest.java
index b5a5b5a45aa..88c24698a14 100644
--- a/test/jdk/java/util/Properties/PropertiesStoreTest.java
+++ b/test/jdk/java/util/Properties/PropertiesStoreTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -21,9 +21,6 @@
  * questions.
  */
 
-import org.testng.Assert;
-import org.testng.annotations.DataProvider;
-import org.testng.annotations.Test;
 
 import java.io.BufferedReader;
 import java.io.IOException;
@@ -45,13 +42,18 @@ import java.util.Properties;
 import java.util.Set;
 import java.util.TreeSet;
 import java.util.stream.Collectors;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
 
 /*
  * @test
  * @summary tests the order in which the Properties.store() method writes out the properties
  * @bug 8231640 8282023
- * @run testng/othervm PropertiesStoreTest
+ * @run junit/othervm PropertiesStoreTest
  */
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public class PropertiesStoreTest {
 
     private static final String DATE_FORMAT_PATTERN = "EEE MMM dd HH:mm:ss zzz uuuu";
@@ -60,7 +62,6 @@ public class PropertiesStoreTest {
     private static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern(DATE_FORMAT_PATTERN, Locale.US);
     private static final Locale PREV_LOCALE = Locale.getDefault();
 
-    @DataProvider(name = "propsProvider")
     private Object[][] createProps() {
         final Properties simple = new Properties();
         simple.setProperty("1", "one");
@@ -101,7 +102,6 @@ public class PropertiesStoreTest {
     /**
      * Returns a {@link Locale} to use for testing
      */
-    @DataProvider(name = "localeProvider")
     private Object[][] provideLocales() {
         // pick a non-english locale for testing
         Set<Locale> locales = Arrays.stream(Locale.getAvailableLocales())
@@ -122,7 +122,8 @@ public class PropertiesStoreTest {
      * Tests that the {@link Properties#store(Writer, String)} API writes out the properties
      * in the expected order
      */
-    @Test(dataProvider = "propsProvider")
+    @ParameterizedTest
+    @MethodSource("createProps")
     public void testStoreWriterKeyOrder(final Properties props, final String[] expectedOrder) throws Exception {
         // Properties.store(...) to a temp file
         final Path tmpFile = Files.createTempFile("8231640", "props");
@@ -136,7 +137,8 @@ public class PropertiesStoreTest {
      * Tests that the {@link Properties#store(OutputStream, String)} API writes out the properties
      * in the expected order
      */
-    @Test(dataProvider = "propsProvider")
+    @ParameterizedTest
+    @MethodSource("createProps")
     public void testStoreOutputStreamKeyOrder(final Properties props, final String[] expectedOrder) throws Exception {
         // Properties.store(...) to a temp file
         final Path tmpFile = Files.createTempFile("8231640", "props");
@@ -161,7 +163,7 @@ public class PropertiesStoreTest {
         try (final InputStream is = Files.newInputStream(storedProps)) {
             loaded.load(is);
         }
-        Assert.assertEquals(loaded, props, "Unexpected properties loaded from stored state");
+        Assertions.assertEquals(props, loaded, "Unexpected properties loaded from stored state");
 
         // now read lines from the stored file and keep track of the order in which the keys were
         // found in that file. Compare that order with the expected store order of the keys.
@@ -169,10 +171,10 @@ public class PropertiesStoreTest {
         try (final BufferedReader reader = Files.newBufferedReader(storedProps)) {
             actualOrder = readInOrder(reader);
         }
-        Assert.assertEquals(actualOrder.size(), expectedOrder.length,
+        Assertions.assertEquals(expectedOrder.length, actualOrder.size(),
                 "Unexpected number of keys read from stored properties");
         if (!Arrays.equals(actualOrder.toArray(new String[0]), expectedOrder)) {
-            Assert.fail("Unexpected order of stored property keys. Expected order: " + Arrays.toString(expectedOrder)
+            Assertions.fail("Unexpected order of stored property keys. Expected order: " + Arrays.toString(expectedOrder)
                     + ", found order: " + actualOrder);
         }
     }
@@ -180,7 +182,8 @@ public class PropertiesStoreTest {
     /**
      * Tests that {@link Properties#store(Writer, String)} writes out a proper date comment
      */
-    @Test(dataProvider = "localeProvider")
+    @ParameterizedTest
+    @MethodSource("provideLocales")
     public void testStoreWriterDateComment(final Locale testLocale) throws Exception {
         // switch the default locale to the one being tested
         Locale.setDefault(testLocale);
@@ -202,7 +205,8 @@ public class PropertiesStoreTest {
     /**
      * Tests that {@link Properties#store(OutputStream, String)} writes out a proper date comment
      */
-    @Test(dataProvider = "localeProvider")
+    @ParameterizedTest
+    @MethodSource("provideLocales")
     public void testStoreOutputStreamDateComment(final Locale testLocale) throws Exception {
         // switch the default locale to the one being tested
         Locale.setDefault(testLocale);
@@ -232,19 +236,19 @@ public class PropertiesStoreTest {
             while ((line = reader.readLine()) != null) {
                 if (line.startsWith("#")) {
                     if (comment != null) {
-                        Assert.fail("More than one comment line found in the stored properties file " + file);
+                        Assertions.fail("More than one comment line found in the stored properties file " + file);
                     }
                     comment = line.substring(1);
                 }
             }
         }
         if (comment == null) {
-            Assert.fail("No comment line found in the stored properties file " + file);
+            Assertions.fail("No comment line found in the stored properties file " + file);
         }
         try {
             FORMATTER.parse(comment);
         } catch (DateTimeParseException pe) {
-            Assert.fail("Unexpected date comment: " + comment, pe);
+            Assertions.fail("Unexpected date comment: " + comment, pe);
         }
     }
 
diff --git a/test/jdk/java/util/ResourceBundle/modules/basic/BasicTest.java b/test/jdk/java/util/ResourceBundle/modules/basic/BasicTest.java
index 69f0db83258..c17c4622ecb 100644
--- a/test/jdk/java/util/ResourceBundle/modules/basic/BasicTest.java
+++ b/test/jdk/java/util/ResourceBundle/modules/basic/BasicTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -43,7 +43,7 @@
  *        jdk.test.lib.compiler.CompilerUtils
  *        jdk.test.lib.process.ProcessTools
  *        ModuleTestUtil
- * @run testng BasicTest
+ * @run junit BasicTest
  */
 
 import java.nio.file.Path;
@@ -54,13 +54,15 @@ import jdk.test.lib.JDKToolLauncher;
 import jdk.test.lib.Utils;
 import jdk.test.lib.compiler.CompilerUtils;
 import jdk.test.lib.process.ProcessTools;
-import org.testng.annotations.DataProvider;
-import org.testng.annotations.Test;
 
 import static jdk.test.lib.Asserts.assertEquals;
-import static org.testng.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
 
-@Test
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public class BasicTest {
     private static final String SRC_DIR_APPBASIC = "srcAppbasic";
     private static final String SRC_DIR_APPBASIC2 = "srcAppbasic2";
@@ -92,7 +94,6 @@ public class BasicTest {
 
     private static final String MAIN = "test/jdk.test.Main";
 
-    @DataProvider(name = "basicTestData")
     Object[][] basicTestData() {
         return new Object[][] {
                 // Named module "test" contains resource bundles for root and en,
@@ -122,7 +123,8 @@ public class BasicTest {
         };
     }
 
-    @Test(dataProvider = "basicTestData")
+    @ParameterizedTest
+    @MethodSource("basicTestData")
     public void runBasicTest(String src, String mod, List<String> moduleList,
             List<String> localeList, String resFormat) throws Throwable {
         Path srcPath = Paths.get(Utils.TEST_SRC, src);
diff --git a/test/jdk/java/util/ResourceBundle/modules/cache/CacheTest.java b/test/jdk/java/util/ResourceBundle/modules/cache/CacheTest.java
index 5655eb5de2d..df72af38855 100644
--- a/test/jdk/java/util/ResourceBundle/modules/cache/CacheTest.java
+++ b/test/jdk/java/util/ResourceBundle/modules/cache/CacheTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -27,7 +27,7 @@
  * @library /test/lib
  * @modules jdk.compiler
  * @build CacheTest jdk.test.lib.compiler.CompilerUtils
- * @run testng CacheTest
+ * @run junit CacheTest
  */
 
 import java.nio.file.Files;
@@ -37,11 +37,12 @@ import java.nio.file.Paths;
 import static jdk.test.lib.process.ProcessTools.*;
 import jdk.test.lib.compiler.CompilerUtils;
 
-import org.testng.annotations.BeforeTest;
-import org.testng.annotations.Test;
-import static org.testng.Assert.*;
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInstance;
 
-@Test
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public class CacheTest {
 
     private static final String TEST_SRC = System.getProperty("test.src");
@@ -55,7 +56,7 @@ public class CacheTest {
     private static final String MAIN = "test/jdk.test.Main";
     private static final String MAIN_CLASS = "jdk.test.Main";
 
-    @BeforeTest
+    @BeforeAll
     public void compileTestModules() throws Exception {
 
         for (String mn : new String[] {MAIN_BUNDLES_MODULE, TEST_MODULE}) {
diff --git a/test/jdk/java/util/ResourceBundle/modules/casesensitive/CaseInsensitiveNameClash.java b/test/jdk/java/util/ResourceBundle/modules/casesensitive/CaseInsensitiveNameClash.java
index 914ebf6bbf0..45f52b512c8 100644
--- a/test/jdk/java/util/ResourceBundle/modules/casesensitive/CaseInsensitiveNameClash.java
+++ b/test/jdk/java/util/ResourceBundle/modules/casesensitive/CaseInsensitiveNameClash.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -28,7 +28,7 @@
  * @modules jdk.compiler
  * @build jdk.test.lib.compiler.CompilerUtils
  *        jdk.test.lib.process.ProcessTools CaseInsensitiveNameClash
- * @run testng CaseInsensitiveNameClash
+ * @run junit CaseInsensitiveNameClash
  */
 
 import java.nio.file.Files;
@@ -37,10 +37,12 @@ import java.nio.file.Paths;
 import jdk.test.lib.process.ProcessTools;
 import jdk.test.lib.compiler.CompilerUtils;
 
-import org.testng.annotations.BeforeTest;
-import org.testng.annotations.Test;
-import static org.testng.Assert.*;
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInstance;
 
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public class CaseInsensitiveNameClash {
 
     private static final String TEST_SRC = System.getProperty("test.src");
@@ -54,7 +56,7 @@ public class CaseInsensitiveNameClash {
     /**
      * Compiles the module used by the test
      */
-    @BeforeTest
+    @BeforeAll
     public void compileAll() throws Exception {
         Path msrc = SRC_DIR.resolve(MODULE);
         assertTrue(CompilerUtils.compile(msrc, MODS_DIR,
diff --git a/test/jdk/java/util/ResourceBundle/modules/visibility/VisibilityTest.java b/test/jdk/java/util/ResourceBundle/modules/visibility/VisibilityTest.java
index e0fdb9a93ab..ee9da88d705 100644
--- a/test/jdk/java/util/ResourceBundle/modules/visibility/VisibilityTest.java
+++ b/test/jdk/java/util/ResourceBundle/modules/visibility/VisibilityTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -34,7 +34,7 @@
  *        jdk.test.lib.compiler.CompilerUtils
  *        jdk.test.lib.process.ProcessTools
  *        ModuleTestUtil
- * @run testng VisibilityTest
+ * @run junit VisibilityTest
  */
 
 import java.nio.file.Path;
@@ -46,13 +46,13 @@ import jdk.test.lib.JDKToolLauncher;
 import jdk.test.lib.Utils;
 import jdk.test.lib.process.ProcessTools;
 
-import org.testng.annotations.BeforeTest;
-import org.testng.annotations.DataProvider;
-import org.testng.annotations.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
 
-import static org.testng.Assert.assertEquals;
-
-@Test
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public class VisibilityTest {
     private static final Path SRC_DIR = Paths.get(Utils.TEST_SRC, "src");
     private static final Path MODS_DIR = Paths.get(Utils.TEST_CLASSES, "mods");
@@ -63,7 +63,7 @@ public class VisibilityTest {
     private static final List<String> MODULE_LIST = List.of("embargo",
             "exported.named.bundles", "named.bundles", "test");
 
-    @BeforeTest
+    @BeforeAll
     public void prepareTestEnv() throws Throwable {
         MODULE_LIST.forEach(mn -> ModuleTestUtil.prepareModule(SRC_DIR,
                 MODS_DIR, mn, ".properties"));
@@ -93,7 +93,6 @@ public class VisibilityTest {
      * "exported.named.bundle" are exported to unnamed modules.
      */
 
-    @DataProvider(name = "RunWithTestResData")
     Object[][] RunWithTestResData() {
         return new Object[][] {
                 // Tests using jdk.test.TestWithNoModuleArg and jdk.embargo.TestWithNoModuleArg.
@@ -188,7 +187,6 @@ public class VisibilityTest {
         };
     }
 
-    @DataProvider(name = "RunWithExportedResData")
     Object[][] RunWithExportedResData() {
         return new Object[][] {
                 // Tests using jdk.test.TestWithNoModuleArg and jdk.embargo.TestWithNoModuleArg
@@ -285,7 +283,6 @@ public class VisibilityTest {
         };
     }
 
-    @DataProvider(name = "RunWithPkgResData")
     Object[][] RunWithPkgResData() {
         return new Object[][] {
                 // jdk.pkg.resources.* are in an unnamed module.
@@ -300,10 +297,11 @@ public class VisibilityTest {
     /**
      * Test cases with jdk.test.resources.*
      */
-    @Test(dataProvider = "RunWithTestResData")
+    @ParameterizedTest
+    @MethodSource("RunWithTestResData")
     public void RunWithTestRes(List<String> argsList) throws Throwable {
         int exitCode = runCmd(argsList);
-        assertEquals(exitCode, 0, "Execution of the tests with "
+        assertEquals(0, exitCode, "Execution of the tests with "
                 + "jdk.test.resources.* failed. "
                 + "Unexpected exit code: " + exitCode);
     }
@@ -311,10 +309,11 @@ public class VisibilityTest {
     /**
      * Test cases with jdk.test.resources.exported.*
      */
-    @Test(dataProvider = "RunWithExportedResData")
+    @ParameterizedTest
+    @MethodSource("RunWithExportedResData")
     public void RunWithExportedRes(List<String> argsList) throws Throwable {
         int exitCode = runCmd(argsList);
-        assertEquals(exitCode, 0, "Execution of the tests with "
+        assertEquals(0, exitCode, "Execution of the tests with "
                 + "jdk.test.resources.exported.* failed. "
                 + "Unexpected exit code: " + exitCode);
     }
@@ -322,10 +321,11 @@ public class VisibilityTest {
     /**
      * Test cases with jdk.pkg.resources.*
      */
-    @Test(dataProvider = "RunWithPkgResData")
+    @ParameterizedTest
+    @MethodSource("RunWithPkgResData")
     public void RunWithPkgRes(List<String> argsList) throws Throwable {
         int exitCode = runCmd(argsList);
-        assertEquals(exitCode, 0, "Execution of the tests with "
+        assertEquals(0, exitCode, "Execution of the tests with "
                 + "jdk.pkg.resources.* failed. "
                 + "Unexpected exit code: " + exitCode);
     }
diff --git a/test/jdk/java/util/TimeZone/NegativeDSTTest.java b/test/jdk/java/util/TimeZone/NegativeDSTTest.java
index eb46b8d4b29..ab9438f2388 100644
--- a/test/jdk/java/util/TimeZone/NegativeDSTTest.java
+++ b/test/jdk/java/util/TimeZone/NegativeDSTTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2019, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -21,7 +21,7 @@
  * questions.
  */
 
-import static org.testng.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import java.time.Instant;
 import java.time.LocalDate;
@@ -31,18 +31,19 @@ import java.time.ZoneId;
 import java.util.Date;
 import java.util.TimeZone;
 
-import org.testng.annotations.Test;
-import org.testng.annotations.DataProvider;
-import static org.testng.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
 
 /**
  * @test
  * @bug 8212970 8324065
  * @summary Test whether the savings are positive in time zones that have
  *      negative savings in the source TZ files.
- * @run testng NegativeDSTTest
+ * @run junit NegativeDSTTest
  */
-@Test
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public class NegativeDSTTest {
 
     private static final TimeZone DUBLIN = TimeZone.getTimeZone("Europe/Dublin");
@@ -51,7 +52,6 @@ public class NegativeDSTTest {
     private static final TimeZone CASABLANCA = TimeZone.getTimeZone("Africa/Casablanca");
     private static final int ONE_HOUR = 3600_000;
 
-    @DataProvider
     private Object[][] negativeDST () {
         return new Object[][] {
             // TimeZone, localDate, offset, isDaylightSavings
@@ -88,10 +88,11 @@ public class NegativeDSTTest {
         };
     }
 
-    @Test(dataProvider="negativeDST")
+    @ParameterizedTest
+    @MethodSource("negativeDST")
     public void test_NegativeDST(TimeZone tz, LocalDate ld, int offset, boolean isDST) {
         Date d = Date.from(Instant.from(ZonedDateTime.of(ld, LocalTime.MIN, tz.toZoneId())));
-        assertEquals(tz.getOffset(d.getTime()), offset);
-        assertEquals(tz.inDaylightTime(d), isDST);
+        assertEquals(offset, tz.getOffset(d.getTime()));
+        assertEquals(isDST, tz.inDaylightTime(d));
     }
 }
diff --git a/test/jdk/java/util/TimeZone/ZoneIdRoundTripTest.java b/test/jdk/java/util/TimeZone/ZoneIdRoundTripTest.java
index 0f1eeb88328..16e24f7cb27 100644
--- a/test/jdk/java/util/TimeZone/ZoneIdRoundTripTest.java
+++ b/test/jdk/java/util/TimeZone/ZoneIdRoundTripTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2022, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,20 +25,20 @@ import java.time.ZoneId;
 import java.time.ZoneOffset;
 import java.util.TimeZone;
 
-import org.testng.annotations.Test;
-import org.testng.annotations.DataProvider;
-import static org.testng.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
 
 /**
  * @test
  * @bug 8285844
  * @summary Checks round-trips between TimeZone and ZoneId are consistent
- * @run testng ZoneIdRoundTripTest
+ * @run junit ZoneIdRoundTripTest
  */
-@Test
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public class ZoneIdRoundTripTest {
 
-    @DataProvider
     private Object[][] testZoneIds() {
         return new Object[][] {
                 {ZoneId.of("Z"), 0},
@@ -60,11 +60,12 @@ public class ZoneIdRoundTripTest {
         };
     }
 
-    @Test(dataProvider="testZoneIds")
+    @ParameterizedTest
+    @MethodSource("testZoneIds")
     public void test_ZoneIdRoundTrip(ZoneId zid, int offset) {
         var tz = TimeZone.getTimeZone(zid);
-        assertEquals(tz.getRawOffset(), offset);
-        assertEquals(tz.toZoneId().normalized(), zid.normalized());
+        assertEquals(offset, tz.getRawOffset());
+        assertEquals(zid.normalized(), tz.toZoneId().normalized());
     }
 }