diff --git a/src/test/org/apache/commons/math/ode/nonstiff/ClassicalRungeKuttaIntegratorTest.java b/src/test/org/apache/commons/math/ode/nonstiff/ClassicalRungeKuttaIntegratorTest.java
index 69e92196a..181d772d8 100644
--- a/src/test/org/apache/commons/math/ode/nonstiff/ClassicalRungeKuttaIntegratorTest.java
+++ b/src/test/org/apache/commons/math/ode/nonstiff/ClassicalRungeKuttaIntegratorTest.java
@@ -189,7 +189,7 @@ public class ClassicalRungeKuttaIntegratorTest
       maxError = 0;
     }
     public void handleStep(StepInterpolator interpolator,
-                           boolean isLast) {
+                           boolean isLast) throws DerivativeException {
 
       double[] interpolatedY = interpolator.getInterpolatedState ();
       double[] theoreticalY  = pb.computeTheoreticalState(interpolator.getCurrentTime());
diff --git a/src/test/org/apache/commons/math/ode/nonstiff/EulerStepInterpolatorTest.java b/src/test/org/apache/commons/math/ode/nonstiff/EulerStepInterpolatorTest.java
index cf52b6552..f2e1b4b1e 100644
--- a/src/test/org/apache/commons/math/ode/nonstiff/EulerStepInterpolatorTest.java
+++ b/src/test/org/apache/commons/math/ode/nonstiff/EulerStepInterpolatorTest.java
@@ -37,7 +37,7 @@ import org.junit.Test;
 public class EulerStepInterpolatorTest {
 
   @Test
-  public void noReset() {
+  public void noReset() throws DerivativeException {
 
     double[]   y    =   { 0.0, 1.0, -2.0 };
     double[][] yDot = { { 1.0, 2.0, -2.0 } };
diff --git a/src/test/org/apache/commons/math/ode/nonstiff/GillIntegratorTest.java b/src/test/org/apache/commons/math/ode/nonstiff/GillIntegratorTest.java
index 3034c480e..76bdf1ec8 100644
--- a/src/test/org/apache/commons/math/ode/nonstiff/GillIntegratorTest.java
+++ b/src/test/org/apache/commons/math/ode/nonstiff/GillIntegratorTest.java
@@ -179,9 +179,9 @@ public class GillIntegratorTest
       maxError = 0;
     }
     public void handleStep(StepInterpolator interpolator,
-                           boolean isLast) {
+                           boolean isLast) throws DerivativeException {
 
-      double[] interpolatedY = interpolator.getInterpolatedState ();
+      double[] interpolatedY = interpolator.getInterpolatedState();
       double[] theoreticalY  = pb.computeTheoreticalState(interpolator.getCurrentTime());
       double dx = interpolatedY[0] - theoreticalY[0];
       double dy = interpolatedY[1] - theoreticalY[1];
diff --git a/src/test/org/apache/commons/math/ode/nonstiff/HighamHall54IntegratorTest.java b/src/test/org/apache/commons/math/ode/nonstiff/HighamHall54IntegratorTest.java
index 91108c3be..9174cc41b 100644
--- a/src/test/org/apache/commons/math/ode/nonstiff/HighamHall54IntegratorTest.java
+++ b/src/test/org/apache/commons/math/ode/nonstiff/HighamHall54IntegratorTest.java
@@ -373,10 +373,10 @@ public class HighamHall54IntegratorTest
       maxError = 0;
     }
     public void handleStep(StepInterpolator interpolator,
-                           boolean isLast) {
+                           boolean isLast) throws DerivativeException {
 
       ++nbSteps;
-      double[] interpolatedY = interpolator.getInterpolatedState ();
+      double[] interpolatedY = interpolator.getInterpolatedState();
       double[] theoreticalY  = pb.computeTheoreticalState(interpolator.getCurrentTime());
       double dx = interpolatedY[0] - theoreticalY[0];
       double dy = interpolatedY[1] - theoreticalY[1];
diff --git a/src/test/org/apache/commons/math/ode/nonstiff/ThreeEighthesIntegratorTest.java b/src/test/org/apache/commons/math/ode/nonstiff/ThreeEighthesIntegratorTest.java
index 174392f27..90cd06711 100644
--- a/src/test/org/apache/commons/math/ode/nonstiff/ThreeEighthesIntegratorTest.java
+++ b/src/test/org/apache/commons/math/ode/nonstiff/ThreeEighthesIntegratorTest.java
@@ -174,9 +174,9 @@ public class ThreeEighthesIntegratorTest
     }
 
     public void handleStep(StepInterpolator interpolator,
-                           boolean isLast) {
+                           boolean isLast) throws DerivativeException {
 
-      double[] interpolatedY = interpolator.getInterpolatedState ();
+      double[] interpolatedY = interpolator.getInterpolatedState();
       double[] theoreticalY  = pb.computeTheoreticalState(interpolator.getCurrentTime());
       double dx = interpolatedY[0] - theoreticalY[0];
       double dy = interpolatedY[1] - theoreticalY[1];