diff --git a/jackson-modules/jackson/src/main/java/com/baeldung/jackson/jsonnode/GetAllKeysFromJSON.java b/jackson-modules/jackson/src/main/java/com/baeldung/jackson/jsonnode/GetAllKeysFromJSON.java
index d740b457af..bb8e9a8646 100644
--- a/jackson-modules/jackson/src/main/java/com/baeldung/jackson/jsonnode/GetAllKeysFromJSON.java
+++ b/jackson-modules/jackson/src/main/java/com/baeldung/jackson/jsonnode/GetAllKeysFromJSON.java
@@ -8,33 +8,27 @@ import java.util.Map;
 import java.util.Map.Entry;
 
 import com.fasterxml.jackson.core.JsonFactory;
+import com.fasterxml.jackson.core.JsonParseException;
 import com.fasterxml.jackson.core.JsonParser;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.core.JsonToken;
 import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.JsonMappingException;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.node.ArrayNode;
 
 public class GetAllKeysFromJSON {
 
-    public static List<String> getKeysInJsonUsingMaps(String json, ObjectMapper mapper) {
+    public List<String> getKeysInJsonUsingMaps(String json, ObjectMapper mapper) throws JsonMappingException, JsonProcessingException {
         List<String> keys = new ArrayList<>();
-
-        try {
-            Map<String, Object> jsonElements = mapper.readValue(json, new TypeReference<Map<String, Object>>() {
-            });
-            getAllKeys(jsonElements, keys);
-            return keys;
-
-        } catch (JsonProcessingException e) {
-            e.printStackTrace();
-        }
-
+        Map<String, Object> jsonElements = mapper.readValue(json, new TypeReference<Map<String, Object>>() {
+        });
+        getAllKeys(jsonElements, keys);
         return keys;
     }
 
-    public static void getAllKeys(Map<String, Object> jsonElements, List<String> keys) {
+    private void getAllKeys(Map<String, Object> jsonElements, List<String> keys) {
 
         jsonElements.entrySet()
             .forEach(entry -> {
@@ -54,51 +48,35 @@ public class GetAllKeysFromJSON {
             });
     }
 
-    public static List<String> getKeysInJsonUsingJsonNodeFieldNames(String json, ObjectMapper mapper) {
+    public List<String> getKeysInJsonUsingJsonNodeFieldNames(String json, ObjectMapper mapper) throws JsonMappingException, JsonProcessingException {
+
         List<String> keys = new ArrayList<>();
-
-        try {
-            JsonNode jsonNode = mapper.readTree(json);
-            Iterator<String> iterator = jsonNode.fieldNames();
-            iterator.forEachRemaining(e -> keys.add(e));
-
-        } catch (JsonProcessingException e) {
-            e.printStackTrace();
-        }
+        JsonNode jsonNode = mapper.readTree(json);
+        Iterator<String> iterator = jsonNode.fieldNames();
+        iterator.forEachRemaining(e -> keys.add(e));
         return keys;
     }
 
-    public static List<String> getAllKeysInJsonUsingJsonNodeFieldNames(String json, ObjectMapper mapper) {
+    public List<String> getAllKeysInJsonUsingJsonNodeFieldNames(String json, ObjectMapper mapper) throws JsonMappingException, JsonProcessingException {
+
         List<String> keys = new ArrayList<>();
-
-        try {
-            JsonNode jsonNode = mapper.readTree(json);
-            getAllKeysUsingJsonNodeFieldNames(jsonNode, keys);
-
-        } catch (JsonProcessingException e) {
-            e.printStackTrace();
-        }
+        JsonNode jsonNode = mapper.readTree(json);
+        getAllKeysUsingJsonNodeFieldNames(jsonNode, keys);
         return keys;
     }
 
-    public static List<String> getAllKeysInJsonUsingJsonNodeFields(String json, ObjectMapper mapper) {
+    public List<String> getAllKeysInJsonUsingJsonNodeFields(String json, ObjectMapper mapper) throws JsonMappingException, JsonProcessingException {
+
         List<String> keys = new ArrayList<>();
-
-        try {
-            JsonNode jsonNode = mapper.readTree(json);
-            getAllKeysUsingJsonNodeFields(jsonNode, keys);
-
-        } catch (JsonProcessingException e) {
-            e.printStackTrace();
-        }
+        JsonNode jsonNode = mapper.readTree(json);
+        getAllKeysUsingJsonNodeFields(jsonNode, keys);
         return keys;
     }
 
-    public static void getAllKeysUsingJsonNodeFields(JsonNode jsonNode, List<String> keys) {
+    private void getAllKeysUsingJsonNodeFields(JsonNode jsonNode, List<String> keys) {
 
         if (jsonNode.isObject()) {
             Iterator<Entry<String, JsonNode>> fields = jsonNode.fields();
-
             fields.forEachRemaining(field -> {
                 keys.add(field.getKey());
                 getAllKeysUsingJsonNodeFieldNames((JsonNode) field.getValue(), keys);
@@ -112,11 +90,10 @@ public class GetAllKeysFromJSON {
 
     }
 
-    public static void getAllKeysUsingJsonNodeFieldNames(JsonNode jsonNode, List<String> keys) {
+    private void getAllKeysUsingJsonNodeFieldNames(JsonNode jsonNode, List<String> keys) {
 
         if (jsonNode.isObject()) {
             Iterator<String> fieldNames = jsonNode.fieldNames();
-
             fieldNames.forEachRemaining(fieldName -> {
                 keys.add(fieldName);
                 getAllKeysUsingJsonNodeFieldNames(jsonNode.get(fieldName), keys);
@@ -130,43 +107,29 @@ public class GetAllKeysFromJSON {
 
     }
 
-    public static List<String> getKeysInJsonUsingJsonParser(String json, ObjectMapper mapper) {
+    public List<String> getKeysInJsonUsingJsonParser(String json, ObjectMapper mapper) throws IOException {
+
         List<String> keys = new ArrayList<>();
-
-        try {
-            JsonNode jsonNode = mapper.readTree(json);
-            JsonParser jsonParser = jsonNode.traverse();
-            while (!jsonParser.isClosed()) {
-                if (jsonParser.nextToken() == JsonToken.FIELD_NAME) {
-                    keys.add((jsonParser.getCurrentName()));
-                }
+        JsonNode jsonNode = mapper.readTree(json);
+        JsonParser jsonParser = jsonNode.traverse();
+        while (!jsonParser.isClosed()) {
+            if (jsonParser.nextToken() == JsonToken.FIELD_NAME) {
+                keys.add((jsonParser.getCurrentName()));
             }
-        } catch (JsonProcessingException e) {
-            e.printStackTrace();
-        } catch (IOException e) {
-            e.printStackTrace();
         }
-
         return keys;
     }
 
-    public static List<String> getKeysInJsonUsingJsonParser(String json) {
+    public List<String> getKeysInJsonUsingJsonParser(String json) throws JsonParseException, IOException {
+
         List<String> keys = new ArrayList<>();
-
-        try {
-            JsonFactory factory = new JsonFactory();
-            JsonParser jsonParser = factory.createParser(json);
-            while (!jsonParser.isClosed()) {
-                if (jsonParser.nextToken() == JsonToken.FIELD_NAME) {
-                    keys.add((jsonParser.getCurrentName()));
-                }
+        JsonFactory factory = new JsonFactory();
+        JsonParser jsonParser = factory.createParser(json);
+        while (!jsonParser.isClosed()) {
+            if (jsonParser.nextToken() == JsonToken.FIELD_NAME) {
+                keys.add((jsonParser.getCurrentName()));
             }
-        } catch (JsonProcessingException e) {
-            e.printStackTrace();
-        } catch (IOException e) {
-            e.printStackTrace();
         }
-
         return keys;
     }
 }
diff --git a/jackson-modules/jackson/src/test/java/com/baeldung/jackson/jsonnode/GetAllKeysFromJSONUnitTest.java b/jackson-modules/jackson/src/test/java/com/baeldung/jackson/jsonnode/GetAllKeysFromJSONUnitTest.java
index b547422aad..5d0558ca63 100644
--- a/jackson-modules/jackson/src/test/java/com/baeldung/jackson/jsonnode/GetAllKeysFromJSONUnitTest.java
+++ b/jackson-modules/jackson/src/test/java/com/baeldung/jackson/jsonnode/GetAllKeysFromJSONUnitTest.java
@@ -2,10 +2,12 @@ package com.baeldung.jackson.jsonnode;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+import java.io.IOException;
 import java.util.List;
 
 import org.junit.jupiter.api.Test;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
 public class GetAllKeysFromJSONUnitTest {
@@ -16,41 +18,68 @@ public class GetAllKeysFromJSONUnitTest {
         + "         }\r\n" + "      ]\r\n" + "   }\r\n" + "}";
 
     private static ObjectMapper mapper = new ObjectMapper();
+    private static GetAllKeysFromJSON getAllKeysFromJSONUtil = new GetAllKeysFromJSON();
 
     // Top level keys : [Name, Age, BookInterests, FoodInterests]
     // All keys: [Name, Age, BookInterests, Book, Author, Book, Author, FoodInterests, Breakfast, Bread, Beverage, Sandwich, Beverage]
 
     @Test
     public void givenAJsonNode_whenUsingFieldNamesMethod_thenWeGetTopFieldNames() {
-        List<String> keys = GetAllKeysFromJSON.getKeysInJsonUsingJsonNodeFieldNames(json, mapper);
-        assertEquals(4, keys.size());
+        List<String> keys;
+        try {
+            keys = getAllKeysFromJSONUtil.getKeysInJsonUsingJsonNodeFieldNames(json, mapper);
+            assertEquals(4, keys.size());
+        } catch (JsonProcessingException e) {
+            e.printStackTrace();
+        }
     }
 
     @Test
     public void givenAJsonNode_whenUsingFieldNamesMethodForAllNodes_thenWeGetAllFieldNames() {
-        List<String> keys = GetAllKeysFromJSON.getAllKeysInJsonUsingJsonNodeFieldNames(json, mapper);
-        assertEquals(13, keys.size());
+        List<String> keys;
+        try {
+            keys = getAllKeysFromJSONUtil.getAllKeysInJsonUsingJsonNodeFieldNames(json, mapper);
+            assertEquals(13, keys.size());
+        } catch (JsonProcessingException e) {
+            e.printStackTrace();
+        }
     }
 
     @Test
     public void givenAJsonNode_whenUsingFieldsMethod_thenWeGetAllFieldNames() {
-        List<String> keys = GetAllKeysFromJSON.getAllKeysInJsonUsingJsonNodeFields(json, mapper);
-        assertEquals(13, keys.size());
+        List<String> keys;
+        try {
+            keys = getAllKeysFromJSONUtil.getAllKeysInJsonUsingJsonNodeFields(json, mapper);
+            assertEquals(13, keys.size());
+        } catch (JsonProcessingException e) {
+            e.printStackTrace();
+        }
     }
 
     @Test
     public void givenAJsonNode_whenUsingJsonParserMethod_thenWeGetAllFieldNames() {
-        List<String> keys = GetAllKeysFromJSON.getKeysInJsonUsingJsonParser(json, mapper);
-        assertEquals(13, keys.size());
+        List<String> keys;
+        try {
+            keys = getAllKeysFromJSONUtil.getKeysInJsonUsingJsonParser(json, mapper);
+            assertEquals(13, keys.size());
+
+            keys = getAllKeysFromJSONUtil.getKeysInJsonUsingJsonParser(json);
+            assertEquals(13, keys.size());
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
 
-        keys = GetAllKeysFromJSON.getKeysInJsonUsingJsonParser(json);
-        assertEquals(13, keys.size());
     }
 
     @Test
     public void givenAJsonNode_whenUsingMaps_thenWeGetAllFieldNames() {
-        List<String> keys = GetAllKeysFromJSON.getKeysInJsonUsingMaps(json, mapper);
-        assertEquals(13, keys.size());
+        List<String> keys;
+        try {
+            keys = getAllKeysFromJSONUtil.getKeysInJsonUsingMaps(json, mapper);
+            assertEquals(13, keys.size());
+        } catch (JsonProcessingException e) {
+            e.printStackTrace();
+        }
     }
 
 }