diff --git a/jee7/pom.xml b/jee7/pom.xml
index 66991d03a8..f275f56d58 100644
--- a/jee7/pom.xml
+++ b/jee7/pom.xml
@@ -10,7 +10,7 @@
     <packaging>war</packaging>
 
     <properties>
-        <java.min.version>1.7</java.min.version>
+        <java.min.version>1.8</java.min.version>
         <maven.min.version>3.0.0</maven.min.version>
 
         <junit.version>4.12</junit.version>
diff --git a/jee7/src/main/java/com/baeldung/json/PersonBuilder.java b/jee7/src/main/java/com/baeldung/json/PersonBuilder.java
index 5d060827dc..a9ac4032ce 100644
--- a/jee7/src/main/java/com/baeldung/json/PersonBuilder.java
+++ b/jee7/src/main/java/com/baeldung/json/PersonBuilder.java
@@ -1,17 +1,12 @@
 package com.baeldung.json;
 
+import javax.json.*;
 import java.io.IOException;
 import java.io.StringReader;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
-import java.util.ArrayList;
 import java.util.List;
-
-import javax.json.Json;
-import javax.json.JsonArray;
-import javax.json.JsonObject;
-import javax.json.JsonReader;
-import javax.json.JsonString;
+import java.util.stream.Collectors;
 
 public class PersonBuilder {
     private String jsonString;
@@ -35,11 +30,9 @@ public class PersonBuilder {
 
         JsonArray emailsJson = jsonObject.getJsonArray("emails");
 
-        List<String> emails = new ArrayList<>();
-
-        for (JsonString j : emailsJson.getValuesAs(JsonString.class)) {
-            emails.add(j.getString());
-        }
+        List<String> emails = emailsJson.getValuesAs(JsonString.class).stream()
+          .map(JsonString::getString)
+          .collect(Collectors.toList());
 
         person.setEmails(emails);
 
diff --git a/metrics/pom.xml b/metrics/pom.xml
index df22f1aca6..0829c9a116 100644
--- a/metrics/pom.xml
+++ b/metrics/pom.xml
@@ -17,6 +17,10 @@
         <dep.ver.metrics>3.1.0</dep.ver.metrics>
         <dep.ver.servlet>3.1.0</dep.ver.servlet>
         <dep.ver.junit>4.12</dep.ver.junit>
+
+        <maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
     </properties>
 
     <dependencies>
@@ -52,4 +56,20 @@
             <scope>test</scope>
         </dependency>
     </dependencies>
+
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>$[maven.compiler-plugin.version]</version>
+                <configuration>
+                    <source>${maven.compiler.source}</source>
+                    <target>${maven.compiler.target}</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
 </project>
\ No newline at end of file
diff --git a/spring-all/src/test/java/org/baeldung/springretry/SpringRetryTest.java b/spring-all/src/test/java/org/baeldung/springretry/SpringRetryTest.java
index 2f3411957e..3027d67d9e 100644
--- a/spring-all/src/test/java/org/baeldung/springretry/SpringRetryTest.java
+++ b/spring-all/src/test/java/org/baeldung/springretry/SpringRetryTest.java
@@ -32,9 +32,6 @@ public class SpringRetryTest {
 
     @Test(expected = RuntimeException.class)
     public void givenTemplateRetryService_whenCallWithException_thenRetry() {
-        retryTemplate.execute(arg0 -> {
-            myService.templateRetryService();
-            return null;
-        });
+        retryTemplate.execute(arg0 -> myService.templateRetryService());
     }
 }