diff --git a/.gitignore b/.gitignore
index 94eab12..09b2dfd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ pom.xml.tag
 pom.xml.releaseBackup
 pom.xml.next
 release.properties
+_Docs/result/**
diff --git a/pom.xml b/pom.xml
index 13bcf4a..422a62a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" 
+<project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.giaybac</groupId>
@@ -8,33 +8,33 @@
     <packaging>jar</packaging>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>1.7</maven.compiler.source>
-        <maven.compiler.target>1.7</maven.compiler.target>
+        <maven.compiler.source>1.11</maven.compiler.source>
+        <maven.compiler.target>1.11</maven.compiler.target>
     </properties>
 
     <dependencies>
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>18.0</version>
+            <version>30.1-jre</version>
         </dependency>
 
         <dependency>
             <groupId>org.apache.pdfbox</groupId>
             <artifactId>pdfbox</artifactId>
-            <version>2.0.6</version>
+            <version>2.0.22</version>
         </dependency>
 
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
-            <version>1.7.12</version>
+            <version>2.0.0-alpha1</version>
         </dependency>
 
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-log4j12</artifactId>
-            <version>1.7.12</version>
+            <version>2.0.0-alpha1</version>
         </dependency>
 
         <dependency>
diff --git a/src/main/java/com/giaybac/traprange/MAIN.java b/src/main/java/com/giaybac/traprange/MAIN.java
index 60f064a..39fe4f3 100644
--- a/src/main/java/com/giaybac/traprange/MAIN.java
+++ b/src/main/java/com/giaybac/traprange/MAIN.java
@@ -86,17 +86,11 @@ private static void extractTables(String[] args) {
             //begin parsing pdf file
             List<Table> tables = extractor.extract();
 
-            Writer writer = new OutputStreamWriter(new FileOutputStream(out), "UTF-8");
-            try {
+            try (Writer writer = new OutputStreamWriter(new FileOutputStream(out), "UTF-8")) {
                 for (Table table : tables) {
                     writer.write("Page: " + (table.getPageIdx() + 1) + "\n");
                     writer.write(table.toHtml());
                 }
-            } finally {
-                try {
-                    writer.close();
-                } catch (Exception e) {
-                }
             }
         } catch (Exception e) {
             logger.error(null, e);
diff --git a/src/main/java/com/giaybac/traprange/PDFTableExtractor.java b/src/main/java/com/giaybac/traprange/PDFTableExtractor.java
index 075fb57..8d7358b 100755
--- a/src/main/java/com/giaybac/traprange/PDFTableExtractor.java
+++ b/src/main/java/com/giaybac/traprange/PDFTableExtractor.java
@@ -12,28 +12,18 @@
 import com.google.common.collect.LinkedListMultimap;
 import com.google.common.collect.Multimap;
 import com.google.common.collect.Range;
-import java.io.ByteArrayOutputStream;
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileNotFoundException;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStreamWriter;
-import java.io.Writer;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.List;
-import java.util.logging.Level;
 import org.apache.pdfbox.pdmodel.PDDocument;
-import org.apache.pdfbox.pdmodel.PDPage;
 import org.apache.pdfbox.text.PDFTextStripper;
 import org.apache.pdfbox.text.TextPosition;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.*;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
 /**
  *
  * @author Tho Mar 22, 2015 3:34:29 PM
@@ -224,18 +214,7 @@ private Table buildTable(int pageIdx, List<TextPosition> tableContent,
     private TableRow buildRow(int rowIdx, List<TextPosition> rowContent, List<Range<Integer>> columnTrapRanges) {
         TableRow retVal = new TableRow(rowIdx);
         //Sort rowContent
-        Collections.sort(rowContent, new Comparator<TextPosition>() {
-            @Override
-            public int compare(TextPosition o1, TextPosition o2) {
-                int retVal = 0;
-                if (o1.getX() < o2.getX()) {
-                    retVal = -1;
-                } else if (o1.getX() > o2.getX()) {
-                    retVal = 1;
-                }
-                return retVal;
-            }
-        });
+        sortCellContent(rowContent);
         int idx = 0;
         int columnIdx = 0;
         List<TextPosition> cellContent = new ArrayList<>();
@@ -264,18 +243,7 @@ public int compare(TextPosition o1, TextPosition o2) {
     }
 
     private TableCell buildCell(int columnIdx, List<TextPosition> cellContent) {
-        Collections.sort(cellContent, new Comparator<TextPosition>() {
-            @Override
-            public int compare(TextPosition o1, TextPosition o2) {
-                int retVal = 0;
-                if (o1.getX() < o2.getX()) {
-                    retVal = -1;
-                } else if (o1.getX() > o2.getX()) {
-                    retVal = 1;
-                }
-                return retVal;
-            }
-        });
+        sortCellContent(cellContent);
         //String cellContentString = Joiner.on("").join(cellContent.stream().map(e -> e.getCharacter()).iterator());
         StringBuilder cellContentBuilder = new StringBuilder();
         for (TextPosition textPosition : cellContent) {
@@ -285,15 +253,26 @@ public int compare(TextPosition o1, TextPosition o2) {
         return new TableCell(columnIdx, cellContentString);
     }
 
+    private static void sortCellContent(List<TextPosition> cellContent) {
+        Collections.sort(cellContent, (o1, o2) -> {
+            int retVal = 0;
+            if (o1.getX() < o2.getX()) {
+                retVal = -1;
+            } else if (o1.getX() > o2.getX()) {
+                retVal = 1;
+            }
+            return retVal;
+        });
+    }
+
     private List<TextPosition> extractTextPositions(int pageId) throws IOException {
         TextPositionExtractor extractor = new TextPositionExtractor(document, pageId);
         return extractor.extract();
     }
 
     private boolean isExceptedLine(int pageIdx, int lineIdx) {
-        boolean retVal = this.pageNExceptedLinesMap.containsEntry(pageIdx, lineIdx)
+        return this.pageNExceptedLinesMap.containsEntry(pageIdx, lineIdx)
                 || this.pageNExceptedLinesMap.containsEntry(-1, lineIdx);
-        return retVal;
     }
 
     /**
@@ -324,7 +303,6 @@ private List<TextPosition> getTextsByLineRanges(List<Range<Integer>> lineRanges,
                 idx++;
             }
         }
-        //return
         return retVal;
     }
 
@@ -350,8 +328,7 @@ private List<Range<Integer>> getLineRanges(int pageId, List<TextPosition> pageCo
             lineTrapRangeBuilder.addRange(lineRange);
         }
         List<Range<Integer>> lineTrapRanges = lineTrapRangeBuilder.build();
-        List<Range<Integer>> retVal = removeExceptedLines(pageId, lineTrapRanges);
-        return retVal;
+        return removeExceptedLines(pageId, lineTrapRanges);
     }
 
     private List<Range<Integer>> removeExceptedLines(int pageIdx, List<Range<Integer>> lineTrapRanges) {
@@ -363,7 +340,6 @@ private List<Range<Integer>> removeExceptedLines(int pageIdx, List<Range<Integer
                 retVal.add(lineTrapRanges.get(lineIdx));
             }
         }
-        //return
         return retVal;
     }
 
@@ -401,18 +377,15 @@ protected void writeString(String string, List<TextPosition> textPositions) thro
         private List<TextPosition> extract() throws IOException {
             this.stripPage(pageId);
             //sort
-            Collections.sort(textPositions, new Comparator<TextPosition>() {
-                @Override
-                public int compare(TextPosition o1, TextPosition o2) {
-                    int retVal = 0;
-                    if (o1.getY() < o2.getY()) {
-                        retVal = -1;
-                    } else if (o1.getY() > o2.getY()) {
-                        retVal = 1;
-                    }
-                    return retVal;
-
+            Collections.sort(textPositions, (o1, o2) -> {
+                int retVal = 0;
+                if (o1.getY() < o2.getY()) {
+                    retVal = -1;
+                } else if (o1.getY() > o2.getY()) {
+                    retVal = 1;
                 }
+                return retVal;
+
             });
             return this.textPositions;
         }
diff --git a/src/main/java/com/giaybac/traprange/TrapRangeBuilder.java b/src/main/java/com/giaybac/traprange/TrapRangeBuilder.java
index f5704fc..18880af 100644
--- a/src/main/java/com/giaybac/traprange/TrapRangeBuilder.java
+++ b/src/main/java/com/giaybac/traprange/TrapRangeBuilder.java
@@ -34,12 +34,7 @@ public TrapRangeBuilder addRange(Range<Integer> range) {
     public List<Range<Integer>> build() {
         List<Range<Integer>> retVal = new ArrayList<>();
         //order range by lower Bound
-        Collections.sort(ranges, new Comparator<Range>() {
-            @Override
-            public int compare(Range o1, Range o2) {
-                return o1.lowerEndpoint().compareTo(o2.lowerEndpoint());
-            }
-        });
+        Collections.sort(ranges, (Comparator<Range>) (o1, o2) -> o1.lowerEndpoint().compareTo(o2.lowerEndpoint()));
 
         for (Range<Integer> range : ranges) {
             if (retVal.isEmpty()) {
diff --git a/src/main/java/com/giaybac/traprange/entity/TableRow.java b/src/main/java/com/giaybac/traprange/entity/TableRow.java
index b7b1fa1..75c1469 100644
--- a/src/main/java/com/giaybac/traprange/entity/TableRow.java
+++ b/src/main/java/com/giaybac/traprange/entity/TableRow.java
@@ -33,9 +33,7 @@ public String toString() {
         StringBuilder retVal = new StringBuilder();
         int lastCellIdx = 0;
         for (TableCell cell : cells) {
-            for (int idx2 = lastCellIdx; idx2 < cell.getIdx() - 1; idx2++) {
-                retVal.append(";");
-            }
+            retVal.append(";".repeat(Math.max(0, cell.getIdx() - 1 - lastCellIdx)));
             if (cell.getIdx() > 0) {
                 retVal.append(";");
             }
diff --git a/src/main/java/com/giaybac/traprange/invoice/PDFLayoutTextStripper.java b/src/main/java/com/giaybac/traprange/invoice/PDFLayoutTextStripper.java
index 9e4ef40..cdd24dd 100644
--- a/src/main/java/com/giaybac/traprange/invoice/PDFLayoutTextStripper.java
+++ b/src/main/java/com/giaybac/traprange/invoice/PDFLayoutTextStripper.java
@@ -59,9 +59,9 @@
 
 /**
 * Java doc to be completed
-* 
+*
 * @author Jonathan Link
-* 
+*
 */
 public class PDFLayoutTextStripper extends PDFTextStripper {
 
@@ -82,7 +82,7 @@ public PDFLayoutTextStripper() throws IOException {
     }
 
     /**
-    * 
+    *
     * @param page page to parse
     */
     @Override
@@ -92,21 +92,20 @@ public void processPage(PDPage page) throws IOException {
             this.setCurrentPageWidth(pageRectangle.getWidth());
             super.processPage(page);
             this.previousTextPosition = null;
-            this.textLineList = new ArrayList<TextLine>();
+            this.textLineList = new ArrayList<>();
         }
     }
 
     @Override
     protected void writePage() throws IOException {
         List<List<TextPosition>> charactersByArticle = super.getCharactersByArticle();
-        for( int i = 0; i < charactersByArticle.size(); i++) {
-            List<TextPosition> textList = charactersByArticle.get(i);
+        for (List<TextPosition> textList : charactersByArticle) {
             try {
                 this.sortTextPositionList(textList);
-            } catch ( java.lang.IllegalArgumentException e) {
+            } catch (IllegalArgumentException e) {
                 System.err.println(e);
             }
-            this.iterateThroughTextList(textList.iterator()) ;
+            this.iterateThroughTextList(textList.iterator());
         }
         this.writeToOutputStream(this.getTextLineList());
     }
@@ -150,15 +149,13 @@ private void iterateThroughTextList(Iterator<TextPosition> textIterator) {
         List<TextPosition> textPositionList = new ArrayList<TextPosition>();
 
         while ( textIterator.hasNext() ) {
-            TextPosition textPosition = (TextPosition)textIterator.next();
+            TextPosition textPosition = textIterator.next();
             int numberOfNewLines = this.getNumberOfNewLinesFromPreviousTextPosition(textPosition);
-            if ( numberOfNewLines == 0 ) {
-                textPositionList.add(textPosition);
-            } else {
+            if (numberOfNewLines != 0) {
                 this.writeTextPositionList(textPositionList);
                 this.createNewEmptyNewLines(numberOfNewLines);
-                textPositionList.add(textPosition);
             }
+            textPositionList.add(textPosition);
             this.setPreviousTextPosition(textPosition);
         }
         if (!textPositionList.isEmpty()) {
@@ -459,14 +456,12 @@ private double numberOfSpacesBetweenTwoCharacters(final TextPosition textPositio
         double previousTextXPosition = textPosition1.getX();
         double previousTextWidth = textPosition1.getWidth();
         double previousTextEndXPosition = (previousTextXPosition + previousTextWidth);
-        double numberOfSpaces = Math.abs(Math.round(textPosition2.getX() - previousTextEndXPosition));
-        return numberOfSpaces;
+        return (double) Math.abs(Math.round(textPosition2.getX() - previousTextEndXPosition));
     }
 
     private char getCharacterFromTextPosition(final TextPosition textPosition) {
         String string = textPosition.getUnicode();
-        char character = string.charAt(0);
-        return character;
+        return string.charAt(0);
     }
 
     private TextPosition getPreviousTextPosition() {
diff --git a/src/test/java/com/giaybac/traprange/test/TestInvoice2.java b/src/test/java/com/giaybac/traprange/test/TestInvoice2.java
index 9d52e94..64ea99f 100644
--- a/src/test/java/com/giaybac/traprange/test/TestInvoice2.java
+++ b/src/test/java/com/giaybac/traprange/test/TestInvoice2.java
@@ -13,6 +13,7 @@
 import java.util.regex.Pattern;
 import java.util.regex.Matcher;
 import java.util.*;
+import java.util.stream.Collectors;
 
 /**
  * How to run this file:
@@ -48,7 +49,8 @@ public void test() throws IOException {
                 "(\\d+\\/\\d+\\/\\d+\\s\\d+\\:\\d+)",
                 "([a-z0-9A-Z]{5,})"
             };
-            String patternString = "\\s+" + String.join("\\s+", patternStrings) + "\\s+";
+
+            String patternString = "\\s+" + Arrays.asList(patternStrings).stream().collect(Collectors.joining("\\s+"))+ "\\s+";
             Pattern p = Pattern.compile(patternString);
             for (String line : lines) {
                 Matcher matcher = p.matcher(line);
diff --git a/test-command-line.sh b/test-command-line.sh
index 648bbee..3b27440 100644
--- a/test-command-line.sh
+++ b/test-command-line.sh
@@ -4,21 +4,21 @@ rm -rf $home/result/*
 
 # Sample 1
 idx=1
-java -jar traprange.lastest.jar -in "$home/sample-$idx.pdf" -out "$home/result/sample-$idx.html" -el "0,1,-1"
+java -jar traprange.latest.jar -in "$home/sample-$idx.pdf" -out "$home/result/sample-$idx.html" -el "0,1,-1"
 
 # Sample 2
 idx=2
-java -jar traprange.lastest.jar -in "$home/sample-$idx.pdf" -out "$home/result/sample-$idx.html" -el "0,1"
+java -jar traprange.latest.jar -in "$home/sample-$idx.pdf" -out "$home/result/sample-$idx.html" -el "0,1"
 
 # Sample 3
 idx=3
-java -jar traprange.lastest.jar -in "$home/sample-$idx.pdf" -out "$home/result/sample-$idx.html" -ep "0"
+java -jar traprange.latest.jar -in "$home/sample-$idx.pdf" -out "$home/result/sample-$idx.html" -ep "0"
 
 # Sample 4
 idx=4
-java -jar traprange.lastest.jar -in "$home/sample-$idx.pdf" -out "$home/result/sample-$idx.html" -el "0"
+java -jar traprange.latest.jar -in "$home/sample-$idx.pdf" -out "$home/result/sample-$idx.html" -el "0"
 
 # Sample 5
 idx=5
-java -jar traprange.lastest.jar -in "$home/sample-$idx.pdf" -out "$home/result/sample-$idx.html" -el "0@0,1@0"
+java -jar traprange.latest.jar -in "$home/sample-$idx.pdf" -out "$home/result/sample-$idx.html" -el "0@0,1@0"