diff --git a/core-java-9/pom.xml b/core-java-9/pom.xml
index b29838d283..844ad6a782 100644
--- a/core-java-9/pom.xml
+++ b/core-java-9/pom.xml
@@ -60,12 +60,8 @@
 				<configuration>
 					<source>1.9</source>
 					<target>1.9</target>
-
 					<verbose>true</verbose>
-					<!-- <executable>C:\develop\jdks\jdk-9_ea122\bin\javac</executable> 
-						<compilerVersion>1.9</compilerVersion> -->
 				</configuration>
-
 			</plugin>
 
 			<plugin>
@@ -85,12 +81,7 @@
 
 
 		<!-- maven plugins -->
-		<!-- 
-		<maven-war-plugin.version>2.6</maven-war-plugin.version>
-		maven-compiler-plugin.version>3.5.1</maven-compiler-plugin.version> -->
-		<maven-compiler-plugin.version>3.6-jigsaw-SNAPSHOT</maven-compiler-plugin.version>
-
-		
+		<maven-compiler-plugin.version>3.6-jigsaw-SNAPSHOT</maven-compiler-plugin.version>	
 		<maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
 
 		<!-- testing -->
diff --git a/core-java-9/src/test/java/com/baeldung/java9/MultiResultionImageTest.java b/core-java-9/src/test/java/com/baeldung/java9/MultiResultionImageTest.java
index d6c16b91bc..0805e06794 100644
--- a/core-java-9/src/test/java/com/baeldung/java9/MultiResultionImageTest.java
+++ b/core-java-9/src/test/java/com/baeldung/java9/MultiResultionImageTest.java
@@ -1,6 +1,5 @@
 package com.baeldung.java9;
 
-import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertSame;
 
diff --git a/core-java-9/src/test/java/com/baeldung/java9/OptionalToStreamTest.java b/core-java-9/src/test/java/com/baeldung/java9/OptionalToStreamTest.java
index 966c03fe17..56b4bb7b8c 100644
--- a/core-java-9/src/test/java/com/baeldung/java9/OptionalToStreamTest.java
+++ b/core-java-9/src/test/java/com/baeldung/java9/OptionalToStreamTest.java
@@ -7,15 +7,15 @@ import org.junit.Test;
 import static org.junit.Assert.assertEquals;
 
 public class OptionalToStreamTest {
-    
+
     @Test
-    public void testOptionalToStream(){
+    public void testOptionalToStream() {
         Optional<String> op = Optional.ofNullable("String value");
         Stream<String> strOptionalStream = op.stream();
-        Stream<String> filteredStream = strOptionalStream.filter(
-               (str) -> { return str != null && str.startsWith("String"); }
-               );
+        Stream<String> filteredStream = strOptionalStream.filter((str) -> {
+            return str != null && str.startsWith("String");
+        });
         assertEquals(1, filteredStream.count());
-        
+
     }
 }
diff --git a/core-java-9/src/test/java/com/baeldung/java9/SetExamplesTest.java b/core-java-9/src/test/java/com/baeldung/java9/SetExamplesTest.java
index c534ba9d47..0f8db83d9c 100644
--- a/core-java-9/src/test/java/com/baeldung/java9/SetExamplesTest.java
+++ b/core-java-9/src/test/java/com/baeldung/java9/SetExamplesTest.java
@@ -1,6 +1,5 @@
 package com.baeldung.java9;
 
-
 import java.util.Set;
 import org.junit.Test;
 
@@ -9,18 +8,18 @@ import static org.junit.Assert.assertEquals;
 public class SetExamplesTest {
 
     @Test
-    public void testUnmutableSet(){
+    public void testUnmutableSet() {
         Set<String> strKeySet = Set.of("key1", "key2", "key3");
-        try{
+        try {
             strKeySet.add("newKey");
-        }catch(UnsupportedOperationException uoe){          
+        } catch (UnsupportedOperationException uoe) {
         }
-        assertEquals(strKeySet.size(), 3); 
+        assertEquals(strKeySet.size(), 3);
     }
-    
+
     @Test
-    public void testArrayToSet(){
-        Integer [] intArray = new Integer[]{1,2,3,4,5,6,7,8,9,0};
+    public void testArrayToSet() {
+        Integer[] intArray = new Integer[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
         Set<Integer> intSet = Set.of(intArray);
         assertEquals(intSet.size(), intArray.length);
     }