diff --git a/.travis.yml b/.travis.yml
index 3ca591e..388b244 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,8 @@
 language: java
-sudo: false
 
 jdk:
-  - oraclejdk9
+  - oraclejdk11
   - oraclejdk8
-  - openjdk8
-  - openjdk7
 
 after_success:
   - chmod -R 777 ./travis/after_success.sh
diff --git a/pom.xml b/pom.xml
index c60d811..0742237 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
 
-       Copyright 2012-2017 the original author or authors.
+       Copyright 2012-2018 the original author or authors.
 
        Licensed under the Apache License, Version 2.0 (the "License");
        you may not use this file except in compliance with the License.
@@ -23,7 +23,7 @@
   <parent>
     <groupId>org.mybatis</groupId>
     <artifactId>mybatis-parent</artifactId>
-    <version>30</version>
+    <version>31-SNAPSHOT</version>
     <relativePath />
   </parent>
 
@@ -73,7 +73,7 @@
     <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis</artifactId>
-      <version>3.4.5</version>
+      <version>3.4.6</version>
       <scope>provided</scope>
     </dependency>
 
@@ -93,7 +93,7 @@
     <dependency>
       <groupId>org.junit.vintage</groupId>
       <artifactId>junit-vintage-engine</artifactId>
-      <version>4.12.2</version>
+      <version>5.3.2</version>
       <scope>test</scope>
     </dependency>
   </dependencies>
diff --git a/src/main/java/org/mybatis/caches/memcached/AbstractPropertySetter.java b/src/main/java/org/mybatis/caches/memcached/AbstractPropertySetter.java
index b401238..dbe2d3e 100644
--- a/src/main/java/org/mybatis/caches/memcached/AbstractPropertySetter.java
+++ b/src/main/java/org/mybatis/caches/memcached/AbstractPropertySetter.java
@@ -1,5 +1,5 @@
 /**
- *    Copyright 2012-2017 the original author or authors.
+ *    Copyright 2012-2018 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -25,16 +25,14 @@
 import java.util.Properties;
 
 /**
- * Converts a keyed property string in the Config to a proper Java
- * object representation.
+ * Converts a keyed property string in the Config to a proper Java object representation.
  *
  * @author Simone Tripodi
  */
 abstract class AbstractPropertySetter<T> {
 
   /**
-   * 'propertyName'='writermethod' index of {@link MemcachedConfiguration}
-   * properties.
+   * 'propertyName'='writermethod' index of {@link MemcachedConfiguration} properties.
    */
   private static Map<String, Method> WRITERS = new HashMap<String, Method>();
 
@@ -65,17 +63,19 @@ abstract class AbstractPropertySetter<T> {
   private final Method propertyWriterMethod;
 
   /**
-   * The default value used if something goes wrong during the conversion or
-   * the property is not set in the config.
+   * The default value used if something goes wrong during the conversion or the property is not set in the config.
    */
   private final T defaultValue;
 
   /**
    * Build a new property setter.
    *
-   * @param propertyKey the Config property key.
-   * @param propertyName the {@link MemcachedConfiguration} property name.
-   * @param defaultValue the property default value.
+   * @param propertyKey
+   *          the Config property key.
+   * @param propertyName
+   *          the {@link MemcachedConfiguration} property name.
+   * @param defaultValue
+   *          the property default value.
    */
   public AbstractPropertySetter(final String propertyKey, final String propertyName, final T defaultValue) {
     this.propertyKey = propertyKey;
@@ -91,11 +91,12 @@ public AbstractPropertySetter(final String propertyKey, final String propertyNam
   }
 
   /**
-   * Extract a property from the, converts and puts it to the
-   * {@link MemcachedConfiguration}.
+   * Extract a property from the, converts and puts it to the {@link MemcachedConfiguration}.
    *
-   * @param config the Config
-   * @param memcachedConfiguration the {@link MemcachedConfiguration}
+   * @param config
+   *          the Config
+   * @param memcachedConfiguration
+   *          the {@link MemcachedConfiguration}
    */
   public final void set(Properties config, MemcachedConfiguration memcachedConfiguration) {
     String propertyValue = config.getProperty(propertyKey);
@@ -121,9 +122,11 @@ public final void set(Properties config, MemcachedConfiguration memcachedConfigu
   /**
    * Convert a string representation to a proper Java Object.
    *
-   * @param value the value has to be converted.
+   * @param value
+   *          the value has to be converted.
    * @return the converted value.
-   * @throws Exception if any error occurs.
+   * @throws Exception
+   *           if any error occurs.
    */
   protected abstract T convert(String value) throws Exception;
 
diff --git a/src/main/java/org/mybatis/caches/memcached/BooleanPropertySetter.java b/src/main/java/org/mybatis/caches/memcached/BooleanPropertySetter.java
index 3d98d30..aa1aeb6 100644
--- a/src/main/java/org/mybatis/caches/memcached/BooleanPropertySetter.java
+++ b/src/main/java/org/mybatis/caches/memcached/BooleanPropertySetter.java
@@ -1,5 +1,5 @@
 /**
- *    Copyright 2012-2017 the original author or authors.
+ *    Copyright 2012-2018 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -25,9 +25,12 @@ final class BooleanPropertySetter extends AbstractPropertySetter<Boolean> {
   /**
    * Instantiates a String to Boolean setter.
    *
-   * @param propertyKey the OSCache Config property key.
-   * @param propertyName the {@link MemcachedConfiguration} property name.
-   * @param defaultValue the property default value.
+   * @param propertyKey
+   *          the OSCache Config property key.
+   * @param propertyName
+   *          the {@link MemcachedConfiguration} property name.
+   * @param defaultValue
+   *          the property default value.
    */
   public BooleanPropertySetter(final String propertyKey, final String propertyName, final Boolean defaultValue) {
     super(propertyKey, propertyName, defaultValue);
diff --git a/src/main/java/org/mybatis/caches/memcached/CompressorTranscoder.java b/src/main/java/org/mybatis/caches/memcached/CompressorTranscoder.java
index 6147754..1ef8721 100644
--- a/src/main/java/org/mybatis/caches/memcached/CompressorTranscoder.java
+++ b/src/main/java/org/mybatis/caches/memcached/CompressorTranscoder.java
@@ -1,5 +1,5 @@
 /**
- *    Copyright 2012-2017 the original author or authors.
+ *    Copyright 2012-2018 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -31,8 +31,7 @@
 import org.apache.ibatis.cache.CacheException;
 
 /**
- * The Transcoder that compress and decompress the stored objects using the
- * GZIP compression algorithm.
+ * The Transcoder that compress and decompress the stored objects using the GZIP compression algorithm.
  *
  * @author Simone Tripodi
  */
@@ -113,7 +112,8 @@ public int getMaxSize() {
   /**
    * Unconditionally close an {@link InputStream}.
    *
-   * @param closeable the InputStream to close, may be null or already closed.
+   * @param closeable
+   *          the InputStream to close, may be null or already closed.
    */
   private static void closeQuietly(final Closeable closeable) {
     if (closeable != null) {
diff --git a/src/main/java/org/mybatis/caches/memcached/IntegerPropertySetter.java b/src/main/java/org/mybatis/caches/memcached/IntegerPropertySetter.java
index 657281b..04571e6 100644
--- a/src/main/java/org/mybatis/caches/memcached/IntegerPropertySetter.java
+++ b/src/main/java/org/mybatis/caches/memcached/IntegerPropertySetter.java
@@ -1,5 +1,5 @@
 /**
- *    Copyright 2012-2017 the original author or authors.
+ *    Copyright 2012-2018 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -25,9 +25,12 @@ final class IntegerPropertySetter extends AbstractPropertySetter<Integer> {
   /**
    * Instantiates a String to Integer setter.
    *
-   * @param propertyKey the Config property key.
-   * @param propertyName the {@link MemcachedConfiguration} property name.
-   * @param defaultValue the property default value.
+   * @param propertyKey
+   *          the Config property key.
+   * @param propertyName
+   *          the {@link MemcachedConfiguration} property name.
+   * @param defaultValue
+   *          the property default value.
    */
   public IntegerPropertySetter(final String propertyKey, final String propertyName, final Integer defaultValue) {
     super(propertyKey, propertyName, defaultValue);
diff --git a/src/main/java/org/mybatis/caches/memcached/MemcachedCache.java b/src/main/java/org/mybatis/caches/memcached/MemcachedCache.java
index ae3e375..98a14b2 100644
--- a/src/main/java/org/mybatis/caches/memcached/MemcachedCache.java
+++ b/src/main/java/org/mybatis/caches/memcached/MemcachedCache.java
@@ -1,5 +1,5 @@
 /**
- *    Copyright 2012-2017 the original author or authors.
+ *    Copyright 2012-2018 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -41,7 +41,8 @@ public final class MemcachedCache implements Cache {
   /**
    * Builds a new Memcached-based Cache.
    *
-   * @param id the Mapper id.
+   * @param id
+   *          the Mapper id.
    */
   public MemcachedCache(final String id) {
     this.id = id;
diff --git a/src/main/java/org/mybatis/caches/memcached/MemcachedClientWrapper.java b/src/main/java/org/mybatis/caches/memcached/MemcachedClientWrapper.java
index 9299958..7d97210 100644
--- a/src/main/java/org/mybatis/caches/memcached/MemcachedClientWrapper.java
+++ b/src/main/java/org/mybatis/caches/memcached/MemcachedClientWrapper.java
@@ -1,5 +1,5 @@
 /**
- *    Copyright 2012-2017 the original author or authors.
+ *    Copyright 2012-2018 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -96,7 +96,8 @@ public MemcachedClientWrapper() {
   /**
    * Converts the MyBatis object key in the proper string representation.
    * 
-   * @param key the MyBatis object key.
+   * @param key
+   *          the MyBatis object key.
    * @return the proper string representation.
    */
   private String toKeyString(final Object key) {
@@ -128,7 +129,7 @@ public Object getObject(Object key) {
    * Return the stored group in Memcached identified by the specified key.
    *
    * @param groupKey
-   *            the group key.
+   *          the group key.
    * @return the group if was previously stored, null otherwise.
    */
   private ObjectWithCas getGroup(String groupKey) {
@@ -271,8 +272,10 @@ public void putObject(Object key, Object value, String id) {
   /**
    * Stores an object identified by a key in Memcached.
    *
-   * @param keyString the object key
-   * @param value the object has to be stored.
+   * @param keyString
+   *          the object key
+   * @param value
+   *          the object has to be stored.
    */
   private void storeInMemcached(String keyString, Object value) {
     if (value != null && !Serializable.class.isAssignableFrom(value.getClass())) {
diff --git a/src/main/java/org/mybatis/caches/memcached/MemcachedConfiguration.java b/src/main/java/org/mybatis/caches/memcached/MemcachedConfiguration.java
index f6275f6..f290956 100644
--- a/src/main/java/org/mybatis/caches/memcached/MemcachedConfiguration.java
+++ b/src/main/java/org/mybatis/caches/memcached/MemcachedConfiguration.java
@@ -1,5 +1,5 @@
 /**
- *    Copyright 2012-2017 the original author or authors.
+ *    Copyright 2012-2018 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -36,8 +36,7 @@ final class MemcachedConfiguration {
   private String keyPrefix;
 
   /**
-   * The Connection Factory used to establish the connection to Memcached
-   * server(s).
+   * The Connection Factory used to establish the connection to Memcached server(s).
    */
   private ConnectionFactory connectionFactory;
 
@@ -79,7 +78,8 @@ public String getKeyPrefix() {
   }
 
   /**
-   * @param keyPrefix the keyPrefix to set
+   * @param keyPrefix
+   *          the keyPrefix to set
    */
   public void setKeyPrefix(String keyPrefix) {
     this.keyPrefix = keyPrefix;
@@ -93,7 +93,8 @@ public ConnectionFactory getConnectionFactory() {
   }
 
   /**
-   * @param connectionFactory the connectionFactory to set
+   * @param connectionFactory
+   *          the connectionFactory to set
    */
   public void setConnectionFactory(ConnectionFactory connectionFactory) {
     this.connectionFactory = connectionFactory;
@@ -107,7 +108,8 @@ public List<InetSocketAddress> getAddresses() {
   }
 
   /**
-   * @param addresses the addresses to set
+   * @param addresses
+   *          the addresses to set
    */
   public void setAddresses(List<InetSocketAddress> addresses) {
     this.addresses = addresses;
@@ -121,7 +123,8 @@ public boolean isUsingAsyncGet() {
   }
 
   /**
-   * @param usingAsyncGet the usingAsyncGet to set
+   * @param usingAsyncGet
+   *          the usingAsyncGet to set
    */
   public void setUsingAsyncGet(boolean usingAsyncGet) {
     this.usingAsyncGet = usingAsyncGet;
@@ -135,7 +138,8 @@ public boolean isCompressionEnabled() {
   }
 
   /**
-   * @param compressionEnabled the compressionEnabled to set
+   * @param compressionEnabled
+   *          the compressionEnabled to set
    */
   public void setCompressionEnabled(boolean compressionEnabled) {
     this.compressionEnabled = compressionEnabled;
@@ -149,7 +153,8 @@ public int getExpiration() {
   }
 
   /**
-   * @param expiration the expiration to set
+   * @param expiration
+   *          the expiration to set
    */
   public void setExpiration(int expiration) {
     this.expiration = expiration;
@@ -163,7 +168,8 @@ public int getTimeout() {
   }
 
   /**
-   * @param timeout the timeout to set
+   * @param timeout
+   *          the timeout to set
    */
   public void setTimeout(int timeout) {
     this.timeout = timeout;
@@ -177,7 +183,8 @@ public TimeUnit getTimeUnit() {
   }
 
   /**
-   * @param timeUnit the timeUnit to set
+   * @param timeUnit
+   *          the timeUnit to set
    */
   public void setTimeUnit(TimeUnit timeUnit) {
     this.timeUnit = timeUnit;
@@ -195,9 +202,12 @@ public int hashCode() {
   /**
    * Computes a hashCode given the input objects.
    *
-   * @param initialNonZeroOddNumber a non-zero, odd number used as the initial value.
-   * @param multiplierNonZeroOddNumber a non-zero, odd number used as the multiplier.
-   * @param objs the objects to compute hash code.
+   * @param initialNonZeroOddNumber
+   *          a non-zero, odd number used as the initial value.
+   * @param multiplierNonZeroOddNumber
+   *          a non-zero, odd number used as the multiplier.
+   * @param objs
+   *          the objects to compute hash code.
    * @return the computed hashCode.
    */
   public static int hash(int initialNonZeroOddNumber, int multiplierNonZeroOddNumber, Object... objs) {
@@ -230,8 +240,10 @@ && eq(keyPrefix, other.keyPrefix) && eq(timeUnit, other.timeUnit) && eq(timeout,
   /**
    * Verifies input objects are equal.
    *
-   * @param o1 the first argument to compare
-   * @param o2 the second argument to compare
+   * @param o1
+   *          the first argument to compare
+   * @param o2
+   *          the second argument to compare
    * @return true, if the input arguments are equal, false otherwise.
    */
   private static <O> boolean eq(O o1, O o2) {
diff --git a/src/main/java/org/mybatis/caches/memcached/MemcachedConfigurationBuilder.java b/src/main/java/org/mybatis/caches/memcached/MemcachedConfigurationBuilder.java
index 8d731f0..654d57c 100644
--- a/src/main/java/org/mybatis/caches/memcached/MemcachedConfigurationBuilder.java
+++ b/src/main/java/org/mybatis/caches/memcached/MemcachedConfigurationBuilder.java
@@ -1,5 +1,5 @@
 /**
- *    Copyright 2012-2017 the original author or authors.
+ *    Copyright 2012-2018 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -89,7 +89,8 @@ public MemcachedConfiguration parseConfiguration() {
   /**
    * Parses the Config and builds a new {@link MemcachedConfiguration}.
    *
-   * @param the {@link ClassLoader} used to load the {@code memcached.properties} file in classpath.
+   * @param the
+   *          {@link ClassLoader} used to load the {@code memcached.properties} file in classpath.
    * @return the converted {@link MemcachedConfiguration}.
    */
   public MemcachedConfiguration parseConfiguration(ClassLoader classLoader) {
diff --git a/src/main/java/org/mybatis/caches/memcached/StringPropertySetter.java b/src/main/java/org/mybatis/caches/memcached/StringPropertySetter.java
index 318503f..258679e 100644
--- a/src/main/java/org/mybatis/caches/memcached/StringPropertySetter.java
+++ b/src/main/java/org/mybatis/caches/memcached/StringPropertySetter.java
@@ -1,5 +1,5 @@
 /**
- *    Copyright 2012-2017 the original author or authors.
+ *    Copyright 2012-2018 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -25,9 +25,12 @@ final class StringPropertySetter extends AbstractPropertySetter<String> {
   /**
    * Instantiates an identity String setter.
    *
-   * @param propertyKey the OSCache Config property key.
-   * @param propertyName the {@link MemcachedConfiguration} property name.
-   * @param defaultValue the property default value.
+   * @param propertyKey
+   *          the OSCache Config property key.
+   * @param propertyName
+   *          the {@link MemcachedConfiguration} property name.
+   * @param defaultValue
+   *          the property default value.
    */
   public StringPropertySetter(final String propertyKey, final String propertyName, final String defaultValue) {
     super(propertyKey, propertyName, defaultValue);
diff --git a/src/test/java/org/mybatis/caches/memcached/MemcachedTestCase.java b/src/test/java/org/mybatis/caches/memcached/MemcachedTestCase.java
index 5832c99..4761e02 100644
--- a/src/test/java/org/mybatis/caches/memcached/MemcachedTestCase.java
+++ b/src/test/java/org/mybatis/caches/memcached/MemcachedTestCase.java
@@ -1,5 +1,5 @@
 /**
- *    Copyright 2012-2017 the original author or authors.
+ *    Copyright 2012-2018 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -123,8 +123,8 @@ public void groupShouldContainAllKeys() {
     }
 
     /*
-     * Since each thread will create 'threadTestCount' values there should be ( 'valuesPerThread' * 'threadTestCount' ) elements in the group, independently
-     * of any race condition.
+     * Since each thread will create 'threadTestCount' values there should be ( 'valuesPerThread' * 'threadTestCount' )
+     * elements in the group, independently of any race condition.
      */
     @SuppressWarnings("unchecked")
     Set<String> keys = (Set<String>) cache.getObject(newCache.getId());