ClassNotFoundException的，即使含有JAR是构建的一部分 [英] ClassNotFoundException, even though the containing JAR is part of the build

问题描述

我得到一个的ClassNotFoundException 上一个类（ HSSFWorkbook ）包含在包含在一个JAR我的身材。

I am getting a ClassNotFoundException on a class (HSSFWorkbook) that is included in a JAR that is included in my build. The JAR is listed in this list (I am using Eclipse):

Project -> Properties -> Java Build Path -> Libraries

我曾尝试删除，然后重新添加，无果。

I have tried removing and adding it again, to no avail.

我的code是如下：

// ...
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
// ...

public class XLSWorkbook {
    private HSSFWorkbook wb = null;

    // ...
    public XLSWorkbook() {
        wb = new HSSFWorkbook();
    }
}

当我尝试实例化 XLSWorkbook 类的异常。我使用的jar Apache的 POI库（是precise：POI-3.8-20120326的.jar）。

And the exception is thrown when I try to instantiate the XLSWorkbook class. The JAR I am using is the POI library from Apache (to be precise: poi-3.8-20120326.jar).

推荐答案

由于 ADT-18 （我不知道的版本），外部JAR库并没有被明确纳入。你应该把它放在库文件夹内。 ADT将提供进口他们为你。所以，你应该删除库项目 - ＆GT;属性 - ＆GT; Java构建路径 - ＆GT;库

Since ADT-18 (I am not sure about the version), external jar libraries have not to be included explicitly. You should put it inside the libs folder . ADT will provide to import they for you. So you should remove the libraries from Project -> Properties -> Java Build Path -> Libraries

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