diff --git a/.idea/misc.xml b/.idea/misc.xml
index b169464..6cb1a77 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -74,7 +74,7 @@
       </profile-state>
     </entry>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="homebrew-17" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="homebrew-17" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/src/main/java/com/example/parser/FlowableExcelMapper.java b/src/main/java/com/example/parser/FlowableExcelMapper.java
index a32b5a2..e2a5ee1 100644
--- a/src/main/java/com/example/parser/FlowableExcelMapper.java
+++ b/src/main/java/com/example/parser/FlowableExcelMapper.java
@@ -6,10 +6,11 @@ import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
-import org.apache.poi.ss.usermodel.DateUtil;
 import org.springframework.stereotype.Component;
 
 import java.time.*;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeParseException;
 import java.util.*;
 
 
@@ -28,7 +29,7 @@ public class FlowableExcelMapper {
 
     // excelPath defines the location of the Excel file
     // FlowableExcelParser is used to create an ArrayList from the Excel file
-    // The first row of every sheet contains the path of the variables to be created in the JsonNode
+    // The 1st row of every sheet contains the path of the variables to be created in the JsonNode
     // Delimiter is "." for an ObjectNode and "*" for an ArrayNode
     // The 2nd row contains tht type of the variable. Supported types are:
     // - String
@@ -39,22 +40,22 @@ public class FlowableExcelMapper {
     // All sheets are added to an ArrayNode
     // All rows are added to an ArrayNode in the sheets ArrayNode
     // All cell values are added to an ObjectNode in the rows ArrayNode
-    public ArrayNode excelBookToJsonNode(String excelPath) {
-        ArrayList<ArrayList<ArrayList<Object>>> book = flowableExcelParser.parseExcelBook(excelPath);
+    public ArrayNode excelBookResourceToJsonNode(String resourcePath) {
+        ArrayList<ArrayList<ArrayList<String>>> book = flowableExcelParser.parseExcelBookFromResource(resourcePath);
         return bookToJsonNode(book);
     }
 
-    protected ArrayNode bookToJsonNode(ArrayList<ArrayList<ArrayList<Object>>> book) {
+    protected ArrayNode bookToJsonNode(ArrayList<ArrayList<ArrayList<String>>> book) {
         ArrayNode bookNode = objectMapper.createArrayNode();
-        for (ArrayList<ArrayList<Object>> sheet : book) {
+        for (ArrayList<ArrayList<String>> sheet : book) {
             bookNode.add(sheetToJsonNode(sheet));
         }
         return bookNode;
     }
 
-    protected ArrayNode sheetToJsonNode(ArrayList<ArrayList<Object>> rows) {
-        ArrayList<Object> paths = new ArrayList<>();
-        ArrayList<Object> types = new ArrayList<>();
+    protected ArrayNode sheetToJsonNode(ArrayList<ArrayList<String>> rows) {
+        ArrayList<String> paths = new ArrayList<>();
+        ArrayList<String> types = new ArrayList<>();
         ArrayNode arrayNode = objectMapper.createArrayNode();
         for (int rowNum = 0; rowNum < rows.size(); rowNum++) {
             if (rowNum == 0) {
@@ -71,25 +72,37 @@ public class FlowableExcelMapper {
         return arrayNode;
     }
 
-    protected JsonNode rowToJsonNode(ArrayList<Object> types, ArrayList<Object> paths, ArrayList<Object> row, JsonNode jsonNode) {
+    protected JsonNode rowToJsonNode(ArrayList<String> types, ArrayList<String> paths, ArrayList<String> row, JsonNode jsonNode) {
         for (int cellNum = 0; cellNum < row.size(); cellNum++) {
-            Object content = row.get(cellNum);
-            if (content != null) {
-                String type = types.get(cellNum).toString();
+            String cellValue = row.get(cellNum);
+            if (cellValue == null || cellValue.isEmpty()) {
+                jsonNode = addNode(jsonNode, paths.get(cellNum), null);
+            } else {
+                String type = types.get(cellNum);
+                Object content;
                 switch (type) {
-                    case "String": content = content.toString(); break;
-                    case "Boolean": content = Boolean.parseBoolean(content.toString()); break;
-                    case "Integer": content = (int) Double.parseDouble(content.toString()); break;
-                    case "Double": content = Double.parseDouble(content.toString()); break;
+                    case "String": content = cellValue; break;
+                    case "Boolean": content = Boolean.parseBoolean(cellValue); break;
+                    case "Integer": content = Integer.parseInt(cellValue); break;
+                    case "Double": content = Double.parseDouble(cellValue); break;
+                    case "Long": content = Long.parseLong(cellValue); break;
                     case "Date":
                         // Excel considers dates as local dates, but we want them as UTC
-                        Date dateTime = DateUtil.getJavaDate(Double.parseDouble(content.toString()));
-                        content = dateTime.toInstant().plusSeconds(ZonedDateTime.now().getOffset().getTotalSeconds());
+                        Instant instant;
+                        try {
+                            LocalDateTime localDateTime = LocalDateTime.parse(cellValue, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
+                            instant = localDateTime.atZone(ZoneId.systemDefault()).toInstant();
+                        } catch (DateTimeParseException e) {
+                            LocalDate localDate = LocalDate.parse(cellValue, DateTimeFormatter.ofPattern("yyyy-MM-dd"));
+                            instant = localDate.atStartOfDay(ZoneId.systemDefault()).toInstant();
+                        }
+                        content = instant.plusSeconds(ZonedDateTime.now().getOffset().getTotalSeconds());
                         break;
-                    default: break;
+                    default:
+                        throw new RuntimeException("Variable type not supported: " + type);
                 }
+                jsonNode = addNode(jsonNode, paths.get(cellNum), content);
             }
-            jsonNode = addNode(jsonNode, paths.get(cellNum).toString(), content);
         }
         return jsonNode;
     }
diff --git a/src/main/java/com/example/parser/FlowableExcelParser.java b/src/main/java/com/example/parser/FlowableExcelParser.java
index 1150503..4f9ce68 100644
--- a/src/main/java/com/example/parser/FlowableExcelParser.java
+++ b/src/main/java/com/example/parser/FlowableExcelParser.java
@@ -7,6 +7,7 @@ import org.springframework.stereotype.Component;
 
 import java.io.FileInputStream;
 import java.io.IOException;
+import java.net.URL;
 import java.util.ArrayList;
 import java.util.LinkedHashMap;
 
@@ -16,15 +17,15 @@ public class FlowableExcelParser {
 
     // excelPath defines the location of the Excel file
     // Return all cells in all sheets with the following restrictions:
-    // - Max columns per sheet is defined in the first row
+    // - Max column count per sheet is defined in the first row
     // - Max column count starts with the 1st cell and ends with the 1st empty cell
     // - Parsing the sheet stops after the 1st empty row
     // All sheets are added to an ArrayList
     // All rows are added to an ArrayList in the sheets ArrayList
     // All cell values are added to an ArrayList in the rows ArrayList
     // Formulas in cells are evaluated
-    // Excel values can have only 3 types: String, boolean, double
-    public ArrayList<ArrayList<ArrayList<Object>>> parseExcelBook(String excelPath) {
+    // All values are returned as String
+    private ArrayList<ArrayList<ArrayList<String>>> parseExcelBook(String excelPath) {
         try (FileInputStream fileInputStream = new FileInputStream(excelPath)) {
             Workbook workBook = new XSSFWorkbook(fileInputStream);
             return parseBook(workBook);
@@ -33,9 +34,13 @@ public class FlowableExcelParser {
         }
     }
 
+    public ArrayList<ArrayList<ArrayList<String>>> parseExcelBookFromResource(String excelResourcePath) {
+        return parseExcelBook(getResourcePath(excelResourcePath));
+    }
+
     @Deprecated
-    public ArrayList<ArrayList<Object>> parseExcelSheet(String excelPath) {
-        try (FileInputStream fileInputStream = new FileInputStream(excelPath)) {
+    public ArrayList<ArrayList<String>> parseExcelSheetFromResource(String excelResourcePath) {
+        try (FileInputStream fileInputStream = new FileInputStream(getResourcePath(excelResourcePath))) {
             Workbook workBook = new XSSFWorkbook(fileInputStream);
             FormulaEvaluator formulaEvaluator = workBook.getCreationHelper().createFormulaEvaluator();
             Sheet workSheet = workBook.getSheetAt(0);
@@ -45,8 +50,17 @@ public class FlowableExcelParser {
         }
     }
 
-    protected ArrayList<ArrayList<ArrayList<Object>>> parseBook(Workbook workBook ) {
-        ArrayList<ArrayList<ArrayList<Object>>> book = new ArrayList<>();
+    private String getResourcePath(String resourcePath) {
+        ClassLoader classLoader = FlowableExcelParser.class.getClassLoader();
+        URL resourceUrl = classLoader.getResource(resourcePath);
+        if  (resourceUrl == null) {
+            throw new RuntimeException("Resource not found: " + resourcePath);
+        }
+        return resourceUrl.getPath();
+    }
+
+    private ArrayList<ArrayList<ArrayList<String>>> parseBook(Workbook workBook ) {
+        ArrayList<ArrayList<ArrayList<String>>> book = new ArrayList<>();
         FormulaEvaluator formulaEvaluator = workBook.getCreationHelper().createFormulaEvaluator();
         for (Sheet workSheet : workBook) {
             book.add(parseSheet(workSheet, formulaEvaluator));
@@ -54,14 +68,15 @@ public class FlowableExcelParser {
         return book;
     }
 
-    protected ArrayList<ArrayList<Object>> parseSheet(Sheet workSheet, FormulaEvaluator formulaEvaluator) {
-        ArrayList<ArrayList<Object>> sheet = new ArrayList<>();
+    private ArrayList<ArrayList<String>> parseSheet(Sheet workSheet, FormulaEvaluator formulaEvaluator) {
+        ArrayList<ArrayList<String>> sheet = new ArrayList<>();
         // Count columns of first row
         int maxCols = getMaxCols(workSheet.getRow(0));
         int lastRowNum = workSheet.getLastRowNum();
+        DataFormatter dataFormatter = new DataFormatter();
         for (int rowIndex = 0; rowIndex < lastRowNum; rowIndex++) {
             Row workRow = workSheet.getRow(rowIndex);
-            ArrayList<Object> row = parseRow(workRow, maxCols, formulaEvaluator);
+            ArrayList<String> row = parseRow(workRow, maxCols, formulaEvaluator, dataFormatter);
             if (row == null) {
                 // Take all rows until the first empty row
                 break;
@@ -72,34 +87,19 @@ public class FlowableExcelParser {
         return sheet;
     }
 
-    protected ArrayList<Object> parseRow(Row workRow, int maxCols, FormulaEvaluator formulaEvaluator) {
+    private ArrayList<String> parseRow(Row workRow, int maxCols, FormulaEvaluator formulaEvaluator, DataFormatter dataFormatter) {
         if (workRow == null) {
             // Row is empty
             return null;
         }
-        ArrayList<Object> row = new ArrayList<>();
+        ArrayList<String> row = new ArrayList<>();
         boolean allCellsNull = true;
         for (int colIndex = 0; colIndex < maxCols; colIndex++) {
-            Object content = null;
             Cell workCell = workRow.getCell(colIndex);
-            if (workCell != null) {
-                CellType workCellType = workCell.getCellType();
-                if (workCellType != CellType.BLANK && workCellType != CellType._NONE) {
-                    allCellsNull = false;
-                    switch (workCellType) {
-                        case STRING  : content = workCell.getStringCellValue();  break;
-                        case BOOLEAN : content = workCell.getBooleanCellValue(); break;
-                        case NUMERIC : content = workCell.getNumericCellValue(); break;
-                        case FORMULA :
-                            CellValue evaluatedValue = formulaEvaluator.evaluate(workCell);
-                            switch (evaluatedValue.getCellType()) {
-                                case STRING  : content = evaluatedValue.getStringValue();  break;
-                                case BOOLEAN : content = evaluatedValue.getBooleanValue(); break;
-                                case NUMERIC : content = evaluatedValue.getNumberValue(); break;
-                            }
-                            break;
-                    }
-                }
+            formulaEvaluator.evaluate(workCell);
+            String content = dataFormatter.formatCellValue(workCell, formulaEvaluator);
+            if (content != null && !content.isEmpty()) {
+                allCellsNull = false;
             }
             row.add(content);
         }
@@ -111,7 +111,7 @@ public class FlowableExcelParser {
         }
     }
 
-    protected int getMaxCols(Row workRow) {
+    private int getMaxCols(Row workRow) {
         int maxCol = workRow.getLastCellNum();
         for (int colIndex = 0; colIndex < maxCol; colIndex++) {
             Cell workCell = workRow.getCell(colIndex);
@@ -124,15 +124,15 @@ public class FlowableExcelParser {
     }
 
     @Deprecated
-    public ArrayList<LinkedHashMap<String, Object>> parseExcel(String resourcePath) {
-        try (FileInputStream fileInputStream = new FileInputStream(resourcePath)) {
+    public ArrayList<LinkedHashMap<String, Object>> parseExcelFromResource(String resourcePath) {
+        try (FileInputStream fileInputStream = new FileInputStream(getResourcePath(resourcePath))) {
             Workbook workBook = new XSSFWorkbook(fileInputStream);
             FormulaEvaluator formulaEvaluator = workBook.getCreationHelper().createFormulaEvaluator();
-            ArrayList<ArrayList<Object>> sheet = parseSheet(workBook.getSheetAt(0), formulaEvaluator);
+            ArrayList<ArrayList<String>> sheet = parseSheet(workBook.getSheetAt(0), formulaEvaluator);
             ArrayList<String> colHeaders = new ArrayList<>();
             ArrayList<LinkedHashMap<String, Object>> rowList = new ArrayList<>();
             for (int rowIndex = 0; rowIndex < sheet.size(); rowIndex++) {
-                ArrayList<Object> row = sheet.get(rowIndex);
+                ArrayList<String> row = sheet.get(rowIndex);
                 if (rowIndex == 0) {
                     // Header row
                     for (Object cell : row) {
diff --git a/src/main/java/com/example/parser/ParserApp.java b/src/main/java/com/example/parser/ParserApp.java
index 0a740ca..1ef30ac 100644
--- a/src/main/java/com/example/parser/ParserApp.java
+++ b/src/main/java/com/example/parser/ParserApp.java
@@ -8,7 +8,6 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.net.URL;
 import java.util.Map;
 
 @SpringBootApplication
@@ -29,12 +28,8 @@ public class ParserApp {
             throw new RuntimeException(e);
         }
 
-        URL resourceUrl = ParserApp.class.getClassLoader().getResource("flowableExcelParserExampleData.xlsx");
-        assert resourceUrl != null;
-        logger.info("parsed excel={}", flowableExcelParser.parseExcelBook(resourceUrl.getPath()));
+        logger.info("parsed excel={}", flowableExcelParser.parseExcelBookFromResource("flowableExcelParserExampleData.xlsx"));
 
-        resourceUrl = ParserApp.class.getClassLoader().getResource("flowableExcelMapperExampleData.xlsx");
-        assert resourceUrl != null;
-        logger.info("mapped excel={}", flowableExcelMapper.excelBookToJsonNode(resourceUrl.getPath()));
+        logger.info("mapped excel={}", flowableExcelMapper.excelBookResourceToJsonNode("flowableExcelMapperExampleData.xlsx"));
     }
 }
diff --git a/src/test/java/com/example/parser/FlowableExcelMapperTest.java b/src/test/java/com/example/parser/FlowableExcelMapperTest.java
index deca194..035c9a1 100644
--- a/src/test/java/com/example/parser/FlowableExcelMapperTest.java
+++ b/src/test/java/com/example/parser/FlowableExcelMapperTest.java
@@ -1,8 +1,6 @@
 package com.example.parser;
 
 import com.fasterxml.jackson.databind.JsonNode;
-import org.assertj.core.api.Assertions;
-import org.jetbrains.annotations.NotNull;
 import org.junit.jupiter.api.TestInstance;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
@@ -12,7 +10,6 @@ import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 
-import java.net.URL;
 import java.util.ArrayList;
 import java.util.stream.Stream;
 
@@ -27,16 +24,9 @@ class FlowableExcelMapperTest {
     private static final Logger logger = LoggerFactory.getLogger(FlowableExcelMapperTest.class);
 
 
-    protected String getResourcePath(String path) {
-        ClassLoader classLoader = FlowableExcelMapperTest.class.getClassLoader();
-        URL resourceUrl = classLoader.getResource(path);
-        Assertions.assertThat(resourceUrl).isNotNull();
-        return resourceUrl.getPath();
-    }
-
     protected Stream<Arguments> getArgumentsFromExcel(String path) {
         ArrayList<Arguments> argumentList = new ArrayList<>();
-        JsonNode book = flowableExcelMapper.excelBookToJsonNode(getResourcePath(path));
+        JsonNode book = flowableExcelMapper.excelBookResourceToJsonNode(path);
         for (JsonNode sheet : book) {
             for (JsonNode row : sheet) {
                 argumentList.add(Arguments.of(row));
@@ -45,7 +35,6 @@ class FlowableExcelMapperTest {
         return argumentList.stream();
     }
 
-    @NotNull
     protected Stream<Arguments> excelMapperTestData() {
         return getArgumentsFromExcel("flowableExcelMapperTestData.xlsx");
     }
diff --git a/src/test/java/com/example/parser/FlowableExcelParserTest.java b/src/test/java/com/example/parser/FlowableExcelParserTest.java
index 936b2c2..4531e13 100644
--- a/src/test/java/com/example/parser/FlowableExcelParserTest.java
+++ b/src/test/java/com/example/parser/FlowableExcelParserTest.java
@@ -9,7 +9,6 @@ import org.junit.jupiter.params.provider.MethodSource;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 
-import java.net.URL;
 import java.util.*;
 import java.util.stream.Stream;
 
@@ -21,23 +20,16 @@ class FlowableExcelParserTest {
     @Autowired
     private FlowableExcelParser flowableExcelParser;
 
-    protected String getResourcePath(String path) {
-        ClassLoader classLoader = FlowableExcelParserTest.class.getClassLoader();
-        URL resourceUrl = classLoader.getResource(path);
-        Assertions.assertThat(resourceUrl).isNotNull();
-        return resourceUrl.getPath();
-    }
-
-    protected Stream<Arguments> getRowsFromExcel(String path) {
+    protected Stream<Arguments> getArgumentsFromExcelBook(String resourcePath) {
         ArrayList<Arguments> argumentList = new ArrayList<>();
-        ArrayList<ArrayList<ArrayList<Object>>> book = flowableExcelParser.parseExcelBook(getResourcePath(path));
-        for (ArrayList<ArrayList<Object>> sheet : book) {
-            for (ArrayList<Object> row : sheet) {
+        ArrayList<ArrayList<ArrayList<String>>> book = flowableExcelParser.parseExcelBookFromResource(resourcePath);
+        for (ArrayList<ArrayList<String>> sheet : book) {
+            for (ArrayList<String> row : sheet) {
                 argumentList.add(Arguments.of(row));
             }
         }
-        ArrayList<ArrayList<Object>> sheet = flowableExcelParser.parseExcelSheet(getResourcePath(path));
-        for (ArrayList<Object> row : sheet) {
+        ArrayList<ArrayList<String>> sheet = flowableExcelParser.parseExcelSheetFromResource(resourcePath);
+        for (ArrayList<String> row : sheet) {
             argumentList.add(Arguments.of(row));
         }
         return argumentList.stream();
@@ -45,21 +37,21 @@ class FlowableExcelParserTest {
 
     @NotNull
     protected Stream<Arguments> booleanExcelParserTestData() {
-        return getRowsFromExcel("flowableExcelParserTestDataBoolean.xlsx");
+        return getArgumentsFromExcelBook("flowableExcelParserTestDataBoolean.xlsx");
     }
     @ParameterizedTest
     @MethodSource("booleanExcelParserTestData")
     public void booleanExcelParserTest(ArrayList<Object> row) {
-        Boolean valOr = (Boolean) row.get(0) || (Boolean) row.get(1) || (Boolean) row.get(2);
-        Assertions.assertThat(row.get(3)).isEqualTo(valOr);
+        Boolean valOr = Boolean.parseBoolean(row.get(0).toString()) || Boolean.parseBoolean(row.get(1).toString()) || Boolean.parseBoolean(row.get(2).toString());
+        Assertions.assertThat(Boolean.parseBoolean(row.get(3).toString())).isEqualTo(valOr);
 
-        Boolean valAnd = (Boolean) row.get(0) && (Boolean) row.get(1) && (Boolean) row.get(2);
-        Assertions.assertThat(row.get(4)).isEqualTo(valAnd);
+        Boolean valAnd = Boolean.parseBoolean(row.get(0).toString()) && Boolean.parseBoolean(row.get(1).toString()) && Boolean.parseBoolean(row.get(2).toString());
+        Assertions.assertThat(Boolean.parseBoolean(row.get(4).toString())).isEqualTo(valAnd);
     }
 
     @NotNull
     protected Stream<Arguments> stringExcelParserTestData() {
-        return getRowsFromExcel("flowableExcelParserTestDataString.xlsx");
+        return getArgumentsFromExcelBook("flowableExcelParserTestDataString.xlsx");
     }
     @ParameterizedTest
     @MethodSource("stringExcelParserTestData")
@@ -76,25 +68,25 @@ class FlowableExcelParserTest {
 
     @NotNull
     protected Stream<Arguments> numberExcelParserTestData() {
-        return getRowsFromExcel("flowableExcelParserTestDataInteger.xlsx");
+        return getArgumentsFromExcelBook("flowableExcelParserTestDataInteger.xlsx");
     }
     @ParameterizedTest
     @MethodSource("numberExcelParserTestData")
     public void numberExcelParserTest(ArrayList<Object> row) {
-        Double val12 = (Double) row.get(0) + (Double) row.get(1);
-        Assertions.assertThat(row.get(3)).isEqualTo(val12);
+        Integer val12 = Integer.parseInt(row.get(0).toString()) + Integer.parseInt(row.get(1).toString());
+        Assertions.assertThat(Integer.parseInt(row.get(3).toString())).isEqualTo(val12);
 
-        Double val23 = (Double) row.get(1) + (Double) row.get(2);
-        Assertions.assertThat(row.get(4)).isEqualTo(val23);
+        Integer val23 = Integer.parseInt(row.get(1).toString()) + Integer.parseInt(row.get(2).toString());
+        Assertions.assertThat(Integer.parseInt(row.get(4).toString())).isEqualTo(val23);
 
-        Double val123 = (Double) row.get(0) + (Double) row.get(1) + (Double) row.get(2);
-        Assertions.assertThat(row.get(5)).isEqualTo(val123);
+        Integer val123 = Integer.parseInt(row.get(0).toString()) + Integer.parseInt(row.get(1).toString()) + Integer.parseInt(row.get(2).toString());
+        Assertions.assertThat(Integer.parseInt(row.get(5).toString())).isEqualTo(val123);
     }
 
     @Deprecated
-    protected Stream<Arguments> getArgumentsFromExcel(String path) {
+    protected Stream<Arguments> getArgumentsFromExcel(String resourcePath) {
         ArrayList<Arguments> argumentList = new ArrayList<>();
-        ArrayList<LinkedHashMap<String, Object>> rowList = flowableExcelParser.parseExcel(getResourcePath(path));
+        ArrayList<LinkedHashMap<String, Object>> rowList = flowableExcelParser.parseExcelFromResource(resourcePath);
         for (LinkedHashMap<String, Object> row : rowList) {
             LinkedHashMap<String, Object> inputMap = new LinkedHashMap<>();
             LinkedHashMap<String, Object> outputMap = new LinkedHashMap<>();
@@ -122,12 +114,12 @@ class FlowableExcelParserTest {
         for (Map.Entry<String, Object> entry : outputMap.entrySet()) {
             String key = entry.getKey();
             if (key.equals("output1")) {
-                Boolean val = (Boolean)inputMap.get("input1") || (Boolean)inputMap.get("input2") || (Boolean)inputMap.get("input3");
-                Assertions.assertThat(entry.getValue()).isEqualTo(val);
+                Boolean val = Boolean.parseBoolean(inputMap.get("input1").toString()) || Boolean.parseBoolean(inputMap.get("input2").toString()) || Boolean.parseBoolean(inputMap.get("input3").toString());
+                Assertions.assertThat(Boolean.parseBoolean(entry.getValue().toString())).isEqualTo(val);
             }
             if (key.equals("output2")) {
-                Boolean val = (Boolean)inputMap.get("input1") && (Boolean)inputMap.get("input2") && (Boolean)inputMap.get("input3");
-                Assertions.assertThat(entry.getValue()).isEqualTo(val);
+                Boolean val = Boolean.parseBoolean(inputMap.get("input1").toString()) && Boolean.parseBoolean(inputMap.get("input2").toString()) && Boolean.parseBoolean(inputMap.get("input3").toString());
+                Assertions.assertThat(Boolean.parseBoolean(entry.getValue().toString())).isEqualTo(val);
             }
         }
     }
@@ -166,16 +158,16 @@ class FlowableExcelParserTest {
         for (Map.Entry<String, Object> entry : outputMap.entrySet()) {
             String key = entry.getKey();
             if (key.equals("output1")) {
-                Double val = (Double)inputMap.get("input1") + (Double)inputMap.get("input2");
-                Assertions.assertThat(entry.getValue()).isEqualTo(val);
+                Integer val12 = Integer.parseInt(inputMap.get("input1").toString()) + Integer.parseInt(inputMap.get("input2").toString());
+                Assertions.assertThat(Integer.parseInt(entry.getValue().toString())).isEqualTo(val12);
             }
             if (key.equals("output2")) {
-                Double val = (Double)inputMap.get("input2") + (Double)inputMap.get("input3");
-                Assertions.assertThat(entry.getValue()).isEqualTo(val);
+                Integer val23 = Integer.parseInt(inputMap.get("input2").toString()) + Integer.parseInt(inputMap.get("input3").toString());
+                Assertions.assertThat(Integer.parseInt(entry.getValue().toString())).isEqualTo(val23);
             }
             if (key.equals("output3")) {
-                Double val = (Double)inputMap.get("input1") + (Double)inputMap.get("input2") + (Double)inputMap.get("input3");
-                Assertions.assertThat(entry.getValue()).isEqualTo(val);
+                Integer val12 = Integer.parseInt(inputMap.get("input1").toString()) + Integer.parseInt(inputMap.get("input2").toString()) + Integer.parseInt(inputMap.get("input3").toString());
+                Assertions.assertThat(Integer.parseInt(entry.getValue().toString())).isEqualTo(val12);
             }
         }
     }
diff --git a/src/test/resources/flowableExcelMapperTestData.xlsx b/src/test/resources/flowableExcelMapperTestData.xlsx
index 8986492..cdb53f0 100644
Binary files a/src/test/resources/flowableExcelMapperTestData.xlsx and b/src/test/resources/flowableExcelMapperTestData.xlsx differ
diff --git a/src/test/resources/flowableExcelParserTestDataBoolean.xlsx b/src/test/resources/flowableExcelParserTestDataBoolean.xlsx
index 8d775a6..6ef2638 100644
Binary files a/src/test/resources/flowableExcelParserTestDataBoolean.xlsx and b/src/test/resources/flowableExcelParserTestDataBoolean.xlsx differ
diff --git a/src/test/resources/flowableExcelParserTestDataString.xlsx b/src/test/resources/flowableExcelParserTestDataString.xlsx
index 6973424..bf13a1f 100644
Binary files a/src/test/resources/flowableExcelParserTestDataString.xlsx and b/src/test/resources/flowableExcelParserTestDataString.xlsx differ