diff --git a/acme4j-client/src/main/java/org/shredzone/acme4j/Identifier.java b/acme4j-client/src/main/java/org/shredzone/acme4j/Identifier.java
index e128947a..6d4b3a63 100644
--- a/acme4j-client/src/main/java/org/shredzone/acme4j/Identifier.java
+++ b/acme4j-client/src/main/java/org/shredzone/acme4j/Identifier.java
@@ -183,7 +183,7 @@ public class Identifier implements Serializable {
 
     @Override
     public boolean equals(Object obj) {
-        if (obj == null || !(obj instanceof Identifier)) {
+        if (!(obj instanceof Identifier)) {
             return false;
         }
 
diff --git a/acme4j-it/src/main/java/org/shredzone/acme4j/it/BammBammClient.java b/acme4j-it/src/main/java/org/shredzone/acme4j/it/BammBammClient.java
index 751d68f4..7ab6f801 100644
--- a/acme4j-it/src/main/java/org/shredzone/acme4j/it/BammBammClient.java
+++ b/acme4j-it/src/main/java/org/shredzone/acme4j/it/BammBammClient.java
@@ -14,7 +14,7 @@
 package org.shredzone.acme4j.it;
 
 import java.io.IOException;
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.Objects;
 
 import org.apache.http.HttpResponse;
@@ -86,7 +86,7 @@ public class BammBammClient {
     public void dnsAddARecord(String domain, String ip) throws IOException {
         JSONBuilder jb = new JSONBuilder();
         jb.put("host", domain);
-        jb.array("addresses", Arrays.asList(ip));
+        jb.array("addresses", Collections.singletonList(ip));
         sendRequest("add-a", jb.toString());
     }