Use Java 6 API for exception construction

Use multi-catch

Author: garydgregory

commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/MatrixUtils.java

@@ -692,14 +692,8 @@ public static void deserializeRealVector(final Object instance,
                 instance.getClass().getDeclaredField(fieldName);
             f.setAccessible(true);
             f.set(instance, vector);
-        } catch (NoSuchFieldException nsfe) {
-            IOException ioe = new IOException();
-            ioe.initCause(nsfe);
-            throw ioe;
-        } catch (IllegalAccessException iae) {
-            IOException ioe = new IOException();
-            ioe.initCause(iae);
-            throw ioe;
+        } catch (NoSuchFieldException | IllegalAccessException e) {
+            throw new IOException(e);
         }
     }
 
@@ -798,14 +792,8 @@ public static void deserializeRealMatrix(final Object instance,
                 instance.getClass().getDeclaredField(fieldName);
             f.setAccessible(true);
             f.set(instance, matrix);
-        } catch (NoSuchFieldException nsfe) {
-            IOException ioe = new IOException();
-            ioe.initCause(nsfe);
-            throw ioe;
-        } catch (IllegalAccessException iae) {
-            IOException ioe = new IOException();
-            ioe.initCause(iae);
-            throw ioe;
+        } catch (NoSuchFieldException | IllegalAccessException nsfe) {
+            throw new IOException(nsfe);
         }
     }
 

commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/ode/nonstiff/DormandPrince853StepInterpolator.java

@@ -449,9 +449,7 @@ public void writeExternal(final ObjectOutput out)
         // save the local attributes
         finalizeStep();
     } catch (MaxCountExceededException mcee) {
-        final IOException ioe = new IOException(mcee.getLocalizedMessage());
-        ioe.initCause(mcee);
-        throw ioe;
+        throw new IOException(mcee.getLocalizedMessage(), mcee);
     }
 
     final int dimension = (currentState == null) ? -1 : currentState.length;

commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/ode/sampling/AbstractStepInterpolator.java

@@ -555,9 +555,7 @@ protected void writeBaseExternal(final ObjectOutput out)
         // finalize the step (and don't bother saving the now true flag)
         finalizeStep();
     } catch (MaxCountExceededException mcee) {
-        final IOException ioe = new IOException(mcee.getLocalizedMessage());
-        ioe.initCause(mcee);
-        throw ioe;
+        throw new IOException(mcee.getLocalizedMessage(), mcee);
     }
   }