diff --git a/src/main/java/org/apache/commons/math/optimization/direct/MultivariateFunctionMappingAdapter.java b/src/main/java/org/apache/commons/math/optimization/direct/MultivariateFunctionMappingAdapter.java
index be4eed31d..45cf13a98 100644
--- a/src/main/java/org/apache/commons/math/optimization/direct/MultivariateFunctionMappingAdapter.java
+++ b/src/main/java/org/apache/commons/math/optimization/direct/MultivariateFunctionMappingAdapter.java
@@ -22,7 +22,6 @@ import org.apache.commons.math.analysis.UnivariateFunction;
 import org.apache.commons.math.analysis.function.Logit;
 import org.apache.commons.math.analysis.function.Sigmoid;
 import org.apache.commons.math.exception.DimensionMismatchException;
-import org.apache.commons.math.exception.MathIllegalArgumentException;
 import org.apache.commons.math.exception.NumberIsTooSmallException;
 import org.apache.commons.math.util.FastMath;
 import org.apache.commons.math.util.MathUtils;
@@ -92,7 +91,7 @@ public class MultivariateFunctionMappingAdapter implements MultivariateFunction
      * @param upper upper bounds for each element of the input parameters array
      * (some elements may be set to {@code Double.POSITIVE_INFINITY} for
      * unbounded values)
-     * @exception MathIllegalArgumentException if lower and upper bounds are not
+     * @exception DimensionMismatchException if lower and upper bounds are not
      * consistent, either according to dimension or to values
      */
     public MultivariateFunctionMappingAdapter(final MultivariateFunction bounded,
@@ -151,8 +150,7 @@ public class MultivariateFunctionMappingAdapter implements MultivariateFunction
 
     }
 
-    /** 
-     * Map an array from bounded to unbounded.
+    /** Map an array from bounded to unbounded.
      * @param point bounded value
      * @return unbounded value
      */
@@ -174,6 +172,8 @@ public class MultivariateFunctionMappingAdapter implements MultivariateFunction
      * set up at construction and calls the underlying function using
      * the bounded point.
      * </p>
+     * @param point unbounded value
+     * @return underlying function value
      * @see #unboundedToBounded(double[])
      */
     public double value(double[] point) {
@@ -181,19 +181,19 @@ public class MultivariateFunctionMappingAdapter implements MultivariateFunction
     }
 
     /** Mapping interface. */
-    private static interface Mapper {
+    private interface Mapper {
 
         /** Map a value from unbounded to bounded.
          * @param y unbounded value
          * @return bounded value
          */
-        public double unboundedToBounded(double y);
+        double unboundedToBounded(double y);
 
         /** Map a value from bounded to unbounded.
          * @param x bounded value
          * @return unbounded value
          */
-        public double boundedToUnbounded(double x);
+        double boundedToUnbounded(double x);
 
     }
 
@@ -259,12 +259,12 @@ public class MultivariateFunctionMappingAdapter implements MultivariateFunction
         public double unboundedToBounded(final double y) {
             return upper - FastMath.exp(-y);
         }
-        
+
         /** {@inheritDoc} */
         public double boundedToUnbounded(final double x) {
             return -FastMath.log(upper - x);
         }
-        
+
     }
 
     /** Local class for lower and bounds mapping. */
diff --git a/src/main/java/org/apache/commons/math/optimization/direct/MultivariateFunctionPenaltyAdapter.java b/src/main/java/org/apache/commons/math/optimization/direct/MultivariateFunctionPenaltyAdapter.java
index 94be71122..10cb622e8 100644
--- a/src/main/java/org/apache/commons/math/optimization/direct/MultivariateFunctionPenaltyAdapter.java
+++ b/src/main/java/org/apache/commons/math/optimization/direct/MultivariateFunctionPenaltyAdapter.java
@@ -19,7 +19,6 @@ package org.apache.commons.math.optimization.direct;
 
 import org.apache.commons.math.analysis.MultivariateFunction;
 import org.apache.commons.math.exception.DimensionMismatchException;
-import org.apache.commons.math.exception.MathIllegalArgumentException;
 import org.apache.commons.math.exception.NumberIsTooSmallException;
 import org.apache.commons.math.util.FastMath;
 import org.apache.commons.math.util.MathUtils;
@@ -117,7 +116,7 @@ public class MultivariateFunctionPenaltyAdapter implements MultivariateFunction
      * unbounded values)
      * @param offset base offset of the penalty function
      * @param scale scale of the penalty function
-     * @exception MathIllegalArgumentException if lower bounds, upper bounds and
+     * @exception DimensionMismatchException if lower bounds, upper bounds and
      * scales are not consistent, either according to dimension or to bounadary
      * values
      */
@@ -157,6 +156,7 @@ public class MultivariateFunctionPenaltyAdapter implements MultivariateFunction
      * a replacement value using the offset and scale if bounds are
      * violated, without calling the function at all.
      * </p>
+     * @param point unbounded point
      * @return either underlying function value or penalty function value
      */
     public double value(double[] point) {
diff --git a/src/main/java/org/apache/commons/math/optimization/linear/SimplexTableau.java b/src/main/java/org/apache/commons/math/optimization/linear/SimplexTableau.java
index d96c9167b..b116ef7b3 100644
--- a/src/main/java/org/apache/commons/math/optimization/linear/SimplexTableau.java
+++ b/src/main/java/org/apache/commons/math/optimization/linear/SimplexTableau.java
@@ -409,7 +409,7 @@ class SimplexTableau implements Serializable {
           Integer basicRow = getBasicRow(colIndex);
           if (basicRow != null && basicRow == 0) {
               // if the basic row is found to be the objective function row
-              // set the coefficient to 0 -> this case handles unconstrained 
+              // set the coefficient to 0 -> this case handles unconstrained
               // variables that are still part of the objective function
               coefficients[i] = 0;
           } else if (basicRows.contains(basicRow)) {