diff --git a/core-java-modules/core-java-11/src/test/java/com/baeldung/java11/httpclient/test/HttpRequestUnitTest.java b/core-java-modules/core-java-11/src/test/java/com/baeldung/java11/httpclient/test/HttpRequestUnitTest.java
index e09dccc1f0..a3a5592cd9 100644
--- a/core-java-modules/core-java-11/src/test/java/com/baeldung/java11/httpclient/test/HttpRequestUnitTest.java
+++ b/core-java-modules/core-java-11/src/test/java/com/baeldung/java11/httpclient/test/HttpRequestUnitTest.java
@@ -18,6 +18,7 @@ import java.security.NoSuchAlgorithmException;
 import java.time.Duration;
 
 import org.junit.Test;
+import org.junit.jupiter.api.Disabled;
 
 public class HttpRequestUnitTest {
 
@@ -52,8 +53,8 @@ public class HttpRequestUnitTest {
     * This test will fail as soon as the given URL returns a HTTP 2 response.
     * Therefore, let's leave it commented out.
     * */
-
-   /* @Test
+   @Test
+   @Disabled
     public void shouldFallbackToHttp1_1WhenWebsiteDoesNotUseHttp2() throws IOException, InterruptedException, URISyntaxException, NoSuchAlgorithmException {
         HttpRequest request = HttpRequest.newBuilder()
             .uri(new URI("https://postman-echo.com/get"))
@@ -65,7 +66,7 @@ public class HttpRequestUnitTest {
             .send(request, HttpResponse.BodyHandlers.ofString());
 
         assertThat(response.version(), equalTo(HttpClient.Version.HTTP_1_1));
-    }*/
+    }
 
     @Test
     public void shouldReturnStatusOKWhenSendGetRequestWithDummyHeaders() throws IOException, InterruptedException, URISyntaxException {
diff --git a/core-java-modules/core-java-os/src/test/java/com/baeldung/screenshot/ScreenshotUnitTest.java b/core-java-modules/core-java-os/src/test/java/com/baeldung/screenshot/ScreenshotUnitTest.java
index 4391037eb2..ac358b4e71 100644
--- a/core-java-modules/core-java-os/src/test/java/com/baeldung/screenshot/ScreenshotUnitTest.java
+++ b/core-java-modules/core-java-os/src/test/java/com/baeldung/screenshot/ScreenshotUnitTest.java
@@ -10,6 +10,7 @@ import java.awt.Toolkit;
 import java.awt.image.BufferedImage;
 import java.io.File;
 import org.junit.Test;
+import org.junit.jupiter.api.Disabled;
 
 import static org.junit.Assert.assertTrue;
 
@@ -40,15 +41,16 @@ public class ScreenshotUnitTest {
         assertTrue(imageFile.exists());
     }
 
-    //    This methods needs a component as a parameter and can only be run from an application with a GUI
-    //    @Test
-    //    public void givenComponent_whenTakeScreenshot_thenSaveToFile(Component component) throws Exception {
-    //        Rectangle componentRect = component.getBounds();
-    //        BufferedImage bufferedImage = new BufferedImage(componentRect.width, componentRect.height, BufferedImage.TYPE_INT_ARGB);
-    //        component.paint(bufferedImage.getGraphics());
-    //        File imageFile = File.createTempFile("component-screenshot", "bmp");
-    //        ImageIO.write(bufferedImage, "bmp", imageFile);
-    //        assertTrue(imageFile.exists());
-    //    }
+    // This methods needs a component as a parameter and can only be run from an application with a GUI
+    @Test
+    @Disabled
+    public void givenComponent_whenTakeScreenshot_thenSaveToFile(Component component) throws Exception {
+        Rectangle componentRect = component.getBounds();
+        BufferedImage bufferedImage = new BufferedImage(componentRect.width, componentRect.height, BufferedImage.TYPE_INT_ARGB);
+        component.paint(bufferedImage.getGraphics());
+        File imageFile = File.createTempFile("component-screenshot", "bmp");
+        ImageIO.write(bufferedImage, "bmp", imageFile);
+        assertTrue(imageFile.exists());
+    }
 
 }
\ No newline at end of file
diff --git a/core-java-modules/core-java-time-measurements/src/test/java/com/baeldung/time/ElapsedTimeUnitTest.java b/core-java-modules/core-java-time-measurements/src/test/java/com/baeldung/time/ElapsedTimeManualTest.java
similarity index 97%
rename from core-java-modules/core-java-time-measurements/src/test/java/com/baeldung/time/ElapsedTimeUnitTest.java
rename to core-java-modules/core-java-time-measurements/src/test/java/com/baeldung/time/ElapsedTimeManualTest.java
index e5a9cdd603..211222c665 100644
--- a/core-java-modules/core-java-time-measurements/src/test/java/com/baeldung/time/ElapsedTimeUnitTest.java
+++ b/core-java-modules/core-java-time-measurements/src/test/java/com/baeldung/time/ElapsedTimeManualTest.java
@@ -9,7 +9,7 @@ import java.util.concurrent.TimeUnit;
 import org.apache.commons.lang3.time.StopWatch;
 import org.junit.Test;
 
-public class ElapsedTimeUnitTest {
+public class ElapsedTimeManualTest {
 
     @Test
     public void givenRunningTask_whenMeasuringTimeWithCurrentTimeMillis_thenGetElapsedTime() throws InterruptedException {
@@ -55,7 +55,7 @@ public class ElapsedTimeUnitTest {
      The below test depends on the elapsed time, which isn't ideal in a test.
      Also, it slows down test execution artificially.
      */
-    /*@Test
+    @Test
     public void givenRunningTask_whenMeasuringTimeWithInstantClass_thenGetElapsedTime() throws InterruptedException {
         Instant start = Instant.now();
         System.out.println("start: " + start);
@@ -70,7 +70,7 @@ public class ElapsedTimeUnitTest {
 
         System.out.println("elapsed: " + timeElapsed);
         assertEquals(true, (2000L <= timeElapsed) && (timeElapsed <= 3000L));
-    }*/
+    }
     
     /**
      * Simulate task running for 2.5 seconds.
diff --git a/core-java-modules/core-java/src/test/resources/dictionary.in b/core-java-modules/core-java/src/test/resources/dictionary.in
index 5f4aee4428..0cc22a20b0 100644
--- a/core-java-modules/core-java/src/test/resources/dictionary.in
+++ b/core-java-modules/core-java/src/test/resources/dictionary.in
@@ -1,4 +1,4 @@
-vAA
+AA
 AAH
 AAHED
 AAHING
diff --git a/pom.xml b/pom.xml
index 602b92ffee..63f2a12640 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1368,21 +1368,21 @@
             <modules>
                  <module>core-java-modules/core-java-9</module>
                  <module>core-java-modules/core-java-9-improvements</module>
-                 <module>core-java-modules/core-java-9-jigsaw</module> <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
-                <!-- <module>core-java-modules/core-java-9-new-features</module> --> <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
+                 <module>core-java-modules/core-java-9-jigsaw</module>
+                <!-- <module>core-java-modules/core-java-9-new-features</module> --> <!-- uses preview features, to be decided how to handle -->
                  <module>core-java-modules/core-java-9-streams</module>
                  <module>core-java-modules/core-java-10</module>
-                 <module>core-java-modules/core-java-11</module> <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
+                 <module>core-java-modules/core-java-11</module>
                  <!-- <module>core-java-modules/core-java-12</module> --> <!-- uses preview features, to be decided how to handle -->
                  <!-- <module>core-java-modules/core-java-13</module> --> <!-- uses preview features, to be decided how to handle -->
                  <!-- <module>core-java-modules/core-java-14</module> --> <!-- uses preview features, to be decided how to handle -->
                  <module>core-java-modules/core-java-collections-set</module>
-                 <module>core-java-modules/core-java-date-operations-1</module> <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
-                 <module>core-java-modules/core-java-datetime-conversion</module> <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
-                 <module>core-java-modules/core-java-datetime-string</module> <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
+                 <module>core-java-modules/core-java-date-operations-1</module>
+                 <module>core-java-modules/core-java-datetime-conversion</module>
+                 <module>core-java-modules/core-java-datetime-string</module>
                  <module>core-java-modules/core-java-jpms</module>
-                 <module>core-java-modules/core-java-os</module>  <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
-                 <module>core-java-modules/core-java-time-measurements</module>  <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
+                 <module>core-java-modules/core-java-os</module>
+                 <module>core-java-modules/core-java-time-measurements</module>
                  <module>core-java-modules/multimodulemavenproject</module>
             </modules>
         </profile>
@@ -1412,21 +1412,21 @@
             <modules>
                 <module>core-java-modules/core-java-9</module>
                 <module>core-java-modules/core-java-9-improvements</module>
-                <module>core-java-modules/core-java-9-jigsaw</module> <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
-                <!-- <module>core-java-modules/core-java-9-new-features</module> --> <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
+                <module>core-java-modules/core-java-9-jigsaw</module>
+                <!-- <module>core-java-modules/core-java-9-new-features</module> --> <!-- uses preview features, to be decided how to handle -->
                 <module>core-java-modules/core-java-9-streams</module>
                 <module>core-java-modules/core-java-10</module>
-                <module>core-java-modules/core-java-11</module> <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
+                <module>core-java-modules/core-java-11</module>
                 <!-- <module>core-java-modules/core-java-12</module> --> <!-- uses preview features, to be decided how to handle -->
                 <!-- <module>core-java-modules/core-java-13</module> --> <!-- uses preview features, to be decided how to handle -->
                 <!-- <module>core-java-modules/core-java-14</module> --> <!-- uses preview features, to be decided how to handle -->
                 <module>core-java-modules/core-java-collections-set</module>
-                <module>core-java-modules/core-java-date-operations-1</module> <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
-                <module>core-java-modules/core-java-datetime-conversion</module> <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
-                <module>core-java-modules/core-java-datetime-string</module> <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
+                <module>core-java-modules/core-java-date-operations-1</module>
+                <module>core-java-modules/core-java-datetime-conversion</module>
+                <module>core-java-modules/core-java-datetime-string</module>
                 <module>core-java-modules/core-java-jpms</module>
-                <module>core-java-modules/core-java-os</module>  <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
-                <module>core-java-modules/core-java-time-measurements</module>  <!-- to be fixed in http://team.baeldung.com/browse/JAVA-2824 -->
+                <module>core-java-modules/core-java-os</module>
+                <module>core-java-modules/core-java-time-measurements</module>
                 <module>core-java-modules/multimodulemavenproject</module>
             </modules>
         </profile>