无法解决 java NoClassDefFoundError 但一切看起来都正确......有什么想法吗？

发布于 2024-10-02 01:58:56 字数 755 浏览 0 评论 0原文

如果我没有提供足够的信息或者我不清楚任何事情，请提前抱歉，这是我第一次尝试使用 .bat 和 .config 文件。

我正在使用一款学术软件，并尝试添加和运行我自己的组件。系统使用配置文件来启动系统所需的组件（类）列表，使用如下代码：

semaine.components = \
eu.semaine.examples.swimmer.SwimmerDisplay| \

系统正确运行并且指定的组件被初始化。

我使用以下代码将自己的组件添加到现有组件列表中：

eu.semaine.examples.TestPackage.MyTest| \

但是出现以下错误：

java.lang.NoClassDefFoundError:eu/semaine/examples/TestPackage/MyTest（错误名称：TestPackage/MyTest）

我环顾四周，在我看来，我没有做任何通常会导致此错误的事情，例如我的类名与其存储的文件名匹配（公共类MyTest存储在MyTest.java中），MyTest位于package TestPackage 并且文件结构中的文件夹也被命名为TestPackage。

任何想法或建议将不胜感激。

原文

sorry in advance if I don't give enough information or if I'm unclear about anything, this is my first foray into using .bat and .config files.

I'm using a piece of academic software and am trying to add and run my own components. the system uses a config file to launch a list of components (classes) required for the system using code like this:

semaine.components = \
eu.semaine.examples.swimmer.SwimmerDisplay| \

the system runs correctly and the specified components are initialised.

I add my own component to the list of existing components using the following code:

eu.semaine.examples.TestPackage.MyTest| \

however I get the following error:

java.lang.NoClassDefFoundError:eu/semaine/examples/TestPackage/MyTest (wrong name: TestPackage/MyTest)

I've had a look around and it seems to me that I'm not doing any of the things which usually cause this error, e.g. my class name matches the file name it is stored in (public class MyTest is stored in MyTest.java), MyTest is in the package TestPackage and the folder in the file structure is also named TestPackage.

any ideas or advice would be greatly appreciated.

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笔芯 2024-10-09 01:58:56

您已要求

eu.semaine.examples.TestPackage.MyTest

但说您已将该文件放置在名为 TestPackage 的目录中。

仔细查看批处理文件中指定的类路径。我的猜测是，对于初始冲突，您有一个像这样的目录层次结构，植根于指定的类路径，

eu
  semaine
    examples
        swimmer
           SwimmerDisplay

在说 eu.semaine.examples.TestPackage.MyTest 您说该包将是“eu.semaine.examples.TestPackage”并且目录层次结构现在将是

eu
  semaine
    examples
        swimmer
           SwimmerDisplay.class
        TestPackage
           MyTest.class

我认为你打算改为：

eu
  semaine
    examples
        swimmer
           SwimmerDisplay.class
TestPackage
  MyTest.class

并说该类不是

TestPackage.MyTest

[

eu.semaine.examples.TestPackage.MyTest

顺便说一句，我同意正常约定不是将包名称大写，但我不相信 Java 从大写推断和语义.]

You have asked for

eu.semaine.examples.TestPackage.MyTest

but say that you have placed the file in a directory called TestPackage.

Look carefully at the classpath specified in your batch file. My guess is that you have a directory hierarchy like this for the initial clash, rooted at that specified classpath

eu
  semaine
    examples
        swimmer
           SwimmerDisplay

in saying eu.semaine.examples.TestPackage.MyTest you are saying that the package will be "eu.semaine.examples.TestPackage" and the directory hierarchy will now be

eu
  semaine
    examples
        swimmer
           SwimmerDisplay.class
        TestPackage
           MyTest.class

I think you intend instead:

eu
  semaine
    examples
        swimmer
           SwimmerDisplay.class
TestPackage
  MyTest.class

and to say that the class is just

TestPackage.MyTest

not

eu.semaine.examples.TestPackage.MyTest

[In passing I agree that normal convention is not to capitalise package names, but I don't beleive that Java infers and semantic from the capitalisation.]

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