如果 derby.jar 位于 Eclipse 工作区中，则无法连接到 Derby 数据库

发布于 2024-12-07 10:47:20 字数 946 浏览 0 评论 0原文

我一直在尝试通过 Eclipse Data Tools Platform 创建 Derby DB，一开始我无法让它工作。无论我做什么，我总是遇到同样的错误：

Could not connect to New Derby.
Error creating SQL Model Connection connection to New Derby. (Error: null)
java.lang.NullPointerException
Error creating JDBC Connection connection to New Derby. (Error: null)
java.lang.NullPointerException

当我尝试这个时包含驱动程序的 derby.jar 文件位于“workspace/myproject/lib”文件夹内。然后我将相同的文件放到我的桌面上，将驱动程序设置为指向我的 derby.jar 的新位置，然后一切都开始自动工作...

我做了一些实验，它碰巧在任何地方都可以工作，除了当我放入其中时我的 Eclipse 工作区文件夹。为什么？

最重要的是：如果我想在不同的机器上部署我的应用程序，我是否需要将 derby.jar 放在我的项目文件夹中（也就是我项目的 .jar 中）？

预先感谢大家

编辑：我已经通过 Eclipse 界面将 derby.jar 添加到项目中，具体方法如下：

第一步

第二步

最后一步

原文

I've been trying to create a Derby DB via Eclipse Data Tools Platform and at the beginning I couldn't manage to get it to work.. no matter what I did, I always got the same error:

Could not connect to New Derby.
Error creating SQL Model Connection connection to New Derby. (Error: null)
java.lang.NullPointerException
Error creating JDBC Connection connection to New Derby. (Error: null)
java.lang.NullPointerException

While I was trying this the derby.jar file containing the driver was inside "workspace/myproject/lib" folder. Then I put the same exact file to my Desktop, set the driver to point to the new location of my derby.jar and all started to work automagically...

I did some experiments and it happens that it works everywhere EXCEPT when I put inside my Eclipse workspace folder. Why?

And most important: if I want to deploy my application on different machines do I need the derby.jar inside my project folder (and thus inside the .jar of my project)?

Thanks in advance to everyone

EDIT: I already added derby.jar to the project through Eclipse interface, here's how:

First step

Second step

Last step

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