diff --git a/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/CheckLocalRepositoryDirCommand.java b/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/CheckLocalRepositoryDirCommand.java
index 0bfd5bfe9..b9bf06d55 100644
--- a/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/CheckLocalRepositoryDirCommand.java
+++ b/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/CheckLocalRepositoryDirCommand.java
@@ -7,6 +7,9 @@
 /** Commands for checking and creating the local repository directory if it doesn't exist. */
 class CheckLocalRepositoryDirCommand {
 
+private CheckLocalRepositoryDirCommand() {
+}
+
   static class CheckParentDirCommand extends AbstractQueryCommand {
 
     private static final CheckParentDirCommand INSTANCE = new CheckParentDirCommand();
diff --git a/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/Ignorable.java b/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/Ignorable.java
index 881e7351f..057033e8d 100644
--- a/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/Ignorable.java
+++ b/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/Ignorable.java
@@ -5,5 +5,8 @@
 
 /** Internal Tag Object for Ignorable Messages */
 class Ignorable {
+  private Ignorable() {
+  }
+  
   public static final Logger LOGGER = LoggerFactory.getLogger(Ignorable.class);
 }
diff --git a/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/POMDocumentFactory.java b/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/POMDocumentFactory.java
index 1614898f4..b80838687 100644
--- a/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/POMDocumentFactory.java
+++ b/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/POMDocumentFactory.java
@@ -17,6 +17,9 @@
  */
 class POMDocumentFactory {
 
+private POMDocumentFactory() {
+}
+
   /**
    * Loads a POM document from the provided input stream.
    *
diff --git a/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/Util.java b/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/Util.java
index 9236adefc..7c384db34 100644
--- a/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/Util.java
+++ b/plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/Util.java
@@ -21,6 +21,9 @@
 /** Common Utilities */
 class Util {
 
+private Util() {
+}
+
   private static final Logger LOGGER = LoggerFactory.getLogger(Util.class);
 
   /** Represents a Property Reference - as a regex */