在netbeans中清理並構建失敗

Question

我在Netbeans IDE 6.9中創建一個項目。在一個項目中，我有一個接口IBusinessLogic。在第二個項目中，我創建了一個實現IBusinessLogic的類BusinessLogic。在第三個項目中，我正在創建BusienssLogic的對象，並將該對象分配給IBusinessLogic的引用。 我在編寫時沒有出現任何錯誤，但是當我清理並構建第三個項目時，出現以下異常：

incompatible types
found   : com.abc.businesslogic.BusinessLogic
required: com.abc.businesslogic.interfaces.IBusinessLogic
                com.abc.businesslogic.interfaces.IBusinessLogic logic = bl;
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
D:\ProjectsFeb12\Service\nbproject\build-impl.xml:531: The following error occurred while executing this line:
D:\ProjectsFeb12\Service\nbproject\build-impl.xml:261: Compile failed; see the compiler error output for details.
BUILD FAILED (total time: 3 seconds)

據我所知，我可以在超級類型引用中分配子類型的對象，那么此異常必須是IDE的。 我該如何解決？ 我也將所有代碼都移到了一個新項目中，但是沒有起作用。

碼：

package com.abc.workerhandlers;

import com.abc.businesslogic.BusinessLogic;
import com.abc.businesslogic.interfaces.IBusinessLogic;

public class MQ2MQWorker1 {

    MQ2MQWorker1(){}

    public void init(){

                BusinessLogic bl = new BusinessLogic();
                IBusinessLogic logic = bl;  // This line is giving problem
    }
}

當我運行該項目時，它可以完美執行，但是該項目的jar不在dist目錄中創建。

Answer 1

您確定正確的類在類路徑中嗎？ 順便說一句，你不應該寫

 BusinessLogic bl = new BusinessLogic();
IBusinessLogic logic = bl;  // This line is giving problem

而是IBUsinessLogic logic = new BusinessLogic();