BAEL-3397: Difference between throw e and throw new Exception(e) (#8339)

* Article: Quick and practical example of hexagonal architecture in java with Spring Project

* Removed server.port property from application.properties

* BAEL-3397: Difference between throw e and throw new Exception(e) in java

* BAEL-3397 : Removed links from readme file

* BAEL-3397: removed hexagonal module from the code

* BAEL-3397: renamed exceptions package name to rethrow

core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/rethrow/RethrowDifferentExceptionDemo.java

@@ -0,0 +1,29 @@
+package com.baeldung.rethrow;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import com.baeldung.rethrow.custom.InvalidDataException;
+
+public class RethrowDifferentExceptionDemo {
+
+    private final static Logger LOGGER = Logger.getLogger(RethrowDifferentExceptionDemo.class.getName());
+
+    public static void main(String[] args) throws Exception {
+        String name = null;
+
+        try {
+
+            // Below line will throw NullPointerException
+            if (name.equals("Joe")) {
+                // Do blah blah..
+            }
+
+        } catch (Exception e) {
+            LOGGER.log(Level.WARNING, "So and so user is unable to cast vote because he is found uneligible");
+            throw new InvalidDataException(e);
+        }
+
+    }
+
+}

core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/rethrow/RethrowSameExceptionDemo.java

@@ -0,0 +1,27 @@
+package com.baeldung.rethrow;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public class RethrowSameExceptionDemo {
+
+    private final static Logger LOGGER = Logger.getLogger(RethrowDifferentExceptionDemo.class.getName());
+
+    public static void main(String[] args) throws Exception {
+        String name = null;
+
+        try {
+
+            // Below line will throw NullPointerException
+            if (name.equals("Joe")) {
+                // Do blah blah..
+            }
+
+        } catch (Exception e) {
+            LOGGER.log(Level.WARNING, "Exception occurred due to invalid name");
+            throw e;
+        }
+
+    }
+
+}

core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/rethrow/custom/InvalidDataException.java

@@ -0,0 +1,8 @@
+package com.baeldung.rethrow.custom;
+
+public class InvalidDataException extends Exception {
+
+    public InvalidDataException(Exception e) {
+        super(e);
+    }
+}