diff --git a/src/main/java/org/apache/commons/math/optimization/direct/PowellOptimizer.java b/src/main/java/org/apache/commons/math/optimization/direct/PowellOptimizer.java
index 318addeb0..79292a702 100644
--- a/src/main/java/org/apache/commons/math/optimization/direct/PowellOptimizer.java
+++ b/src/main/java/org/apache/commons/math/optimization/direct/PowellOptimizer.java
@@ -17,8 +17,6 @@
 
 package org.apache.commons.math.optimization.direct;
 
-import java.util.Arrays;
-
 import org.apache.commons.math.FunctionEvaluationException;
 import org.apache.commons.math.MaxIterationsExceededException;
 import org.apache.commons.math.analysis.UnivariateRealFunction;
@@ -114,7 +112,7 @@ public class PowellOptimizer
             double alphaMin = 0;
 
             for (int i = 0; i < n; i++) {
-                final double[] d = Arrays.copyOf(direc[i], n);
+                final double[] d = /* Arrays.*/ copyOf(direc[i], n); // Java 1.5 does not support Arrays.copyOf()
 
                 fX2 = fVal;
 
@@ -287,4 +285,18 @@ public class PowellOptimizer
             return valueAtOptimum;
         }
     }
+
+    /**
+     * Java 1.5 does not support Arrays.copyOf()
+     * 
+     * @param source the array to be copied
+     * @param newLen the length of the copy to be returned
+     * @return the copied array, truncated or padded as necessary.
+     */
+     private double[] copyOf(double[] source, int newLen) {
+         double[] output = new double[newLen];
+         System.arraycopy(source, 0, output, 0, Math.min(source.length, newLen));
+         return output;
+     }
+
 }
diff --git a/src/main/java/org/apache/commons/math/util/MultidimensionalCounter.java b/src/main/java/org/apache/commons/math/util/MultidimensionalCounter.java
index 28f673b27..437a8553e 100644
--- a/src/main/java/org/apache/commons/math/util/MultidimensionalCounter.java
+++ b/src/main/java/org/apache/commons/math/util/MultidimensionalCounter.java
@@ -17,7 +17,6 @@
 
 package org.apache.commons.math.util;
 
-import java.util.Arrays;
 import org.apache.commons.math.exception.DimensionMismatchException;
 import org.apache.commons.math.exception.OutOfRangeException;
 import org.apache.commons.math.exception.NotStrictlyPositiveException;
@@ -129,7 +128,7 @@ public class MultidimensionalCounter implements Iterable<Integer> {
          * @return the indices within the multidimensional counter.
          */
         public int[] getCounts() {
-            return Arrays.copyOf(counter, dimension);
+            return /* Arrays.*/ copyOf(counter, dimension); // Java 1.5 does not support Arrays.copyOf()
         }
 
         /**
@@ -164,7 +163,7 @@ public class MultidimensionalCounter implements Iterable<Integer> {
      */
     public MultidimensionalCounter(int ... size) {
         dimension = size.length;
-        this.size = Arrays.copyOf(size, dimension);
+        this.size = /* Arrays.*/ copyOf(size, dimension); // Java 1.5 does not support Arrays.copyOf()
 
         uniCounterOffset = new int[dimension];
 
@@ -286,7 +285,7 @@ public class MultidimensionalCounter implements Iterable<Integer> {
      * @return the sizes of the multidimensional counter in each dimension.
      */
     public int[] getSizes() {
-        return Arrays.copyOf(size, dimension);
+        return /* Arrays.*/ copyOf(size, dimension); // Java 1.5 does not support Arrays.copyOf()
     }
 
     /**
@@ -300,4 +299,18 @@ public class MultidimensionalCounter implements Iterable<Integer> {
         }
         return sb.toString();
     }
+
+    /**
+     * Java 1.5 does not support Arrays.copyOf()
+     * 
+     * @param source the array to be copied
+     * @param newLen the length of the copy to be returned
+     * @return the copied array, truncated or padded as necessary.
+     */
+     private int[] copyOf(int[] source, int newLen) {
+         int[] output = new int[newLen];
+         System.arraycopy(source, 0, output, 0, Math.min(source.length, newLen));
+         return output;
+     }
+
 }