Fix #107 when we grow the original array, use the same Class that was specified during construction.

hikaricp-java6/src/main/java/com/zaxxer/hikari/util/FastList.java

@@ -25,6 +25,7 @@ import java.lang.reflect.Array;
  */
 public final class FastList<T>
 {
+   private final Class<?> clazz;
    private T[] elementData;
    private int size;
 
@@ -36,6 +37,7 @@ public final class FastList<T>
    public FastList(Class<?> clazz)
    {
       this.elementData = (T[]) Array.newInstance(clazz, 32);
+      this.clazz = clazz;
    }
 
    /**
@@ -47,6 +49,7 @@ public final class FastList<T>
    public FastList(Class<?> clazz, int capacity)
    {
       this.elementData = (T[]) Array.newInstance(clazz, capacity);
+      this.clazz = clazz;
    }
 
    /**
@@ -64,7 +67,7 @@ public final class FastList<T>
          final int oldCapacity = elementData.length;
          final int newCapacity = oldCapacity << 1;
          @SuppressWarnings("unchecked")
-         final T[] newElementData = (T[]) Array.newInstance(element.getClass(), newCapacity);
+         final T[] newElementData = (T[]) Array.newInstance(clazz, newCapacity);
          System.arraycopy(elementData, 0, newElementData, 0, oldCapacity);
          newElementData[size - 1] = element;
          elementData = newElementData;

hikaricp-java6/src/test/java/com/zaxxer/hikari/TestFastList.java

@@ -74,4 +74,31 @@ public class TestFastList
             Assert.assertSame(verifyList.get(i), list.get(i));
         }
     }
+
+    @Test
+    public void testPolyMorphism1()
+    {
+       class Foo implements Base2 {
+          
+       }
+
+       class Bar extends Foo {
+          
+       }
+
+       FastList<Base> list = new FastList<>(Base.class, 2);
+       list.add(new Foo());
+       list.add(new Foo());
+       list.add(new Bar());
+    }
+
+    interface Base
+    {
+       
+    }
+
+    interface Base2 extends Base
+    {
+       
+    }
 }

hikaricp/src/main/java/com/zaxxer/hikari/util/FastList.java

@@ -25,6 +25,7 @@ import java.lang.reflect.Array;
  */
 public final class FastList<T>
 {
+   private final Class<?> clazz;
    private T[] elementData;
    private int size;
 
@@ -36,6 +37,7 @@ public final class FastList<T>
    public FastList(Class<?> clazz)
    {
       this.elementData = (T[]) Array.newInstance(clazz, 32);
+      this.clazz = clazz;
    }
 
    /**
@@ -47,6 +49,7 @@ public final class FastList<T>
    public FastList(Class<?> clazz, int capacity)
    {
       this.elementData = (T[]) Array.newInstance(clazz, capacity);
+      this.clazz = clazz;
    }
 
    /**
@@ -64,7 +67,7 @@ public final class FastList<T>
          final int oldCapacity = elementData.length;
          final int newCapacity = oldCapacity << 1;
          @SuppressWarnings("unchecked")
-         final T[] newElementData = (T[]) Array.newInstance(element.getClass(), newCapacity);
+         final T[] newElementData = (T[]) Array.newInstance(clazz, newCapacity);
          System.arraycopy(elementData, 0, newElementData, 0, oldCapacity);
          newElementData[size - 1] = element;
          elementData = newElementData;

hikaricp/src/test/java/com/zaxxer/hikari/TestFastList.java

@@ -74,4 +74,31 @@ public class TestFastList
             Assert.assertSame(verifyList.get(i), list.get(i));
         }
     }
+
+    @Test
+    public void testPolyMorphism1()
+    {
+       class Foo implements Base2 {
+          
+       }
+
+       class Bar extends Foo {
+          
+       }
+
+       FastList<Base> list = new FastList<>(Base.class, 2);
+       list.add(new Foo());
+       list.add(new Foo());
+       list.add(new Bar());
+    }
+
+    interface Base
+    {
+       
+    }
+
+    interface Base2 extends Base
+    {
+       
+    }
 }