java测试器中的NoClassDefFoundError

Question

class dHeap<T extends Comparable<? super T>> implements dHeapInterface<T>

public dHeap(int heapSize) {
    dVar = 2;
    size = heapSize;
    array = (T[]) new Comparable[heapSize];
    nelems = 0;

}

public class dHeapTester {

private dHeap<Integer> intHeap;
private dHeap<Integer> dHeap;
private dHeap<String> sHeap;


@Before
public void setUp() {

    intHeap = new dHeap<>(5);
    sHeap = new dHeap<>(5);
    dHeap = new dHeap<>(4, 5);

顶级代码是我的类签名和构造函数，底部是我的测试人员。运行测试程序时我得到一个NoClassDefFoundError，它在初始化过程中发生。为什么我收到此错误？ 第三个​​初始化dHeap正在使用第二个构造函数，它选择每个节点所拥有的子节点而不是二进制