SpotBugs.

commons-math-neuralnet/src/main/java/org/apache/commons/math4/neuralnet/oned/NeuronString.java

@@ -184,4 +184,11 @@ public class NeuronString {
             network.addLink(network.getNeuron(size - 1), network.getNeuron(0));
         }
     }
+
+    /**
+     * Prevent finalizer attack (cf. "SpotBugs").
+     */
+    protected final void finalize() {
+        // Do nothing.
+    }
 }

commons-math-neuralnet/src/main/java/org/apache/commons/math4/neuralnet/sofm/util/ExponentialDecayFunction.java

@@ -80,4 +80,11 @@ public class ExponentialDecayFunction implements LongToDoubleFunction {
     public double applyAsDouble(long numCall) {
         return a * Math.exp(-numCall * oneOverB);
     }
+
+    /**
+     * Prevent finalizer attack (cf. "SpotBugs").
+     */
+    protected final void finalize() {
+        // Do nothing.
+    }
 }

commons-math-neuralnet/src/main/java/org/apache/commons/math4/neuralnet/sofm/util/QuasiSigmoidDecayFunction.java

@@ -82,4 +82,11 @@ public class QuasiSigmoidDecayFunction implements LongToDoubleFunction {
     public double applyAsDouble(long numCall) {
         return scale * sigmoid.applyAsDouble((double) numCall);
     }
+
+    /**
+     * Prevent finalizer attack (cf. "SpotBugs").
+     */
+    protected final void finalize() {
+        // Do nothing.
+    }
 }

commons-math-neuralnet/src/main/java/org/apache/commons/math4/neuralnet/twod/NeuronSquareMesh2D.java

@@ -815,4 +815,11 @@ public class NeuronSquareMesh2D
             return mean;
         }
     }
+
+    /**
+     * Prevent finalizer attack (cf. "SpotBugs").
+     */
+    protected final void finalize() {
+        // Do nothing.
+    }
 }

commons-math-neuralnet/src/main/java/org/apache/commons/math4/neuralnet/twod/util/LocationFinder.java

@@ -101,4 +101,11 @@ public class LocationFinder {
     public Location getLocation(Neuron n) {
         return locations.get(n.getIdentifier());
     }
+
+    /**
+     * Prevent finalizer attack (cf. "SpotBugs").
+     */
+    protected final void finalize() {
+        // Do nothing.
+    }
 }