java-streams-8-api - adding slf4j fixing indentation

core-java-8/pom.xml

@@ -41,6 +41,12 @@
             <version>3.3.2</version>
         </dependency>
 
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+
         <!-- test scoped -->
 
         <dependency>

core-java-8/src/test/java/com/baeldung/java8/Java8StreamApiTest.java

@@ -2,44 +2,35 @@ package com.baeldung.java8;
 
 import com.baeldung.streamApi.Product;
 import org.junit.Before;
-import org.junit.BeforeClass;
 import org.junit.Test;
-import org.mockito.Mock;
-import org.mockito.Mockito;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.BufferedWriter;
-import java.io.File;
 import java.io.IOException;
 import java.nio.charset.Charset;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.nio.file.Paths;
 import java.util.*;
-import java.util.logging.Logger;
 import java.util.regex.Pattern;
 import java.util.stream.*;
 
 import static org.junit.Assert.*;
-import static org.mockito.Matchers.anyString;
-import static org.mockito.Mockito.mock;
 
-/**
- * Created by Alex Vengr
- */
 public class Java8StreamApiTest {
 
     private long counter;
 
-    private static Logger log = Logger.getAnonymousLogger();
+    private static Logger log = LoggerFactory.getLogger(Java8StreamApiTest.class);
 
     private List<Product> productList;
 
-
     @Before
     public void init() {
-        productList = Arrays.asList(new Product(23, "potatoes"),
-          new Product(14, "orange"), new Product(13, "lemon"),
-            new Product(23, "bread"), new Product(13, "sugar"));
+        productList = Arrays.asList(
+                new Product(23, "potatoes"), new Product(14, "orange"),
+                new Product(13, "lemon"), new Product(23, "bread"),
+                new Product(13, "sugar"));
     }
 
     @Test
@@ -117,7 +108,7 @@ public class Java8StreamApiTest {
         try {
             streamOfStrings = Files.lines(path, Charset.forName("UTF-8"));
         } catch (IOException e) {
-            e.printStackTrace();
+            log.error("Error creating streams from paths {}", path, e.getMessage(), e);
         }
         assertEquals("a", streamOfStrings.findFirst().get());
 
@@ -215,7 +206,10 @@ public class Java8StreamApiTest {
     public void customCollector_whenResultContainsAllElementsFrSource_thenCorrect() {
         Collector<Product, ?, LinkedList<Product>> toLinkedList =
                 Collector.of(LinkedList::new, LinkedList::add,
-            (first, second) -> { first.addAll(second); return first; });
+                        (first, second) -> {
+                            first.addAll(second);
+                            return first;
+                        });
 
         LinkedList<Product> linkedListOfPersons = productList.stream().collect(toLinkedList);
         assertTrue(linkedListOfPersons.containsAll(productList));
@@ -252,13 +246,13 @@ public class Java8StreamApiTest {
         try {
             path = Files.createTempFile(null, ".txt");
         } catch (IOException e) {
-            e.printStackTrace();
+            log.error(e.getMessage());
         }
 
         try (BufferedWriter writer = Files.newBufferedWriter(path)) {
             writer.write("a\nb\nc");
         } catch (IOException e) {
-            e.printStackTrace();
+            log.error(e.getMessage());
         }
         return path;
     }