Erro com herança e Generics

public class HashtableClosedAddressImpl<T> extends AbstractHashtable<T, LinkedList<T>> {
	
	protected HashFunctionClosedAddressMethod method;
	protected HashFunctionDivisionMethodImpl<T> hashFunction;
	
	// DO NOT DELETE THIS CONSTRUCTOR. ADJUST IT.
	public HashtableClosedAddressImpl(int size, HashFunctionClosedAddressMethod method) {
		
		super(getPrimeAbove(size));
		this.method = method;
		this.hashFunction = new HashFunctionDivisionMethodImpl<T>(this);
		
		//TODO Adjust your constructor here
		// The length of the internal table must be the immediate prime number greater than 
		// the given size. For example, if size=10 then the length must be 11. If size=20, the length 
		// must be 23. You may use the method getPrimeAbove(int size) but you must implement it.
	}
	
	//AUXILIARY
	/**
	 * It returns the prime number that is closest (and greater) to the given number.  
	 */
	static int getPrimeAbove(int number){
		int result = number;
		while(!Util.isPrime(result)){
			result = result + 1;
		}
		return result;
	}
			
	@Override
	public void insert(T element) {
		int hashIndex = ((HashFunctionDivisionMethodImpl<T>) hashFunction).hash(element);
		LinkedList<T> list = table[hashIndex];
		if(list == null){
			table[hashIndex] = new LinkedList<T>();
		}
		list.addFirst(element);
	}

[code]HashtableClosedAddressImpl<Integer>  table = new HashtableClosedAddressImpl<Integer(10,HashFunctionClosedAddressMethod.DIVISION);

table.insert(20);

java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.util.LinkedList;
	at adt.hashtable.HashtableClosedAddressImpl.insert(HashtableClosedAddressImpl.java:40)
	at test.TestHashTableClosedAddress.insertTest(TestHashTableClosedAddress.java:23)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
	at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)