diff --git a/src/main/java/org/apache/commons/math/stat/clustering/KMeansPlusPlusClusterer.java b/src/main/java/org/apache/commons/math/stat/clustering/KMeansPlusPlusClusterer.java
index db304b45a..2eac5f52b 100644
--- a/src/main/java/org/apache/commons/math/stat/clustering/KMeansPlusPlusClusterer.java
+++ b/src/main/java/org/apache/commons/math/stat/clustering/KMeansPlusPlusClusterer.java
@@ -24,7 +24,6 @@ import java.util.Random;
 
 import org.apache.commons.math.exception.ConvergenceException;
 import org.apache.commons.math.exception.MathIllegalArgumentException;
-import org.apache.commons.math.exception.NullArgumentException;
 import org.apache.commons.math.exception.NumberIsTooSmallException;
 import org.apache.commons.math.exception.util.LocalizedFormats;
 import org.apache.commons.math.stat.descriptive.moment.Variance;
diff --git a/src/test/java/org/apache/commons/math/ConvergenceExceptionTest.java b/src/test/java/org/apache/commons/math/ConvergenceExceptionTest.java
index 93c1ab0bb..cbc3a4582 100644
--- a/src/test/java/org/apache/commons/math/ConvergenceExceptionTest.java
+++ b/src/test/java/org/apache/commons/math/ConvergenceExceptionTest.java
@@ -20,7 +20,6 @@ package org.apache.commons.math;
 
 import java.util.Locale;
 
-import org.apache.commons.math.exception.util.LocalizedFormats;
 import org.junit.Assert;
 import org.junit.Test;
 
diff --git a/src/test/java/org/apache/commons/math/ode/sampling/DummyStepInterpolatorTest.java b/src/test/java/org/apache/commons/math/ode/sampling/DummyStepInterpolatorTest.java
index cc88144b0..126c485a5 100644
--- a/src/test/java/org/apache/commons/math/ode/sampling/DummyStepInterpolatorTest.java
+++ b/src/test/java/org/apache/commons/math/ode/sampling/DummyStepInterpolatorTest.java
@@ -25,7 +25,6 @@ import java.io.ObjectInputStream;
 import java.io.IOException;
 
 import org.apache.commons.math.exception.MathUserException;
-import org.apache.commons.math.exception.util.Localizable;
 import org.apache.commons.math.exception.util.LocalizedFormats;
 import org.apache.commons.math.ode.sampling.AbstractStepInterpolator;
 import org.apache.commons.math.ode.sampling.DummyStepInterpolator;
diff --git a/src/test/java/org/apache/commons/math/special/BetaTest.java b/src/test/java/org/apache/commons/math/special/BetaTest.java
index 85449c44b..d4e4588dd 100644
--- a/src/test/java/org/apache/commons/math/special/BetaTest.java
+++ b/src/test/java/org/apache/commons/math/special/BetaTest.java
@@ -19,7 +19,6 @@ package org.apache.commons.math.special;
 import org.apache.commons.math.TestUtils;
 
 import org.junit.Test;
-import org.junit.Assert;
 
 /**
  * @version $Revision$ $Date$