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当我可以在类路径中清楚地看到文件时，为什么Java编译器说我的文件不在类路径中？

[英]Why does the Java compiler say my file was not found in the class path when I can clearly see it in the class path?

原文 2012-01-23 07:35:25 2 2 java

I am using java -classpath $CLASSPATH ... , where $CLASSPATH has been set to /file1path/file1:/file2path/file2 and so on. 我正在使用java -classpath $CLASSPATH ... ，其中$CLASSPATH已设置为/file1path/file1:/file2path/file2 ，依此类推。 Despite this, Java complains that file1 is not found. 尽管如此，Java抱怨找不到file1 。 I tried to set -Dfile1=file:///fullpath/file1 , but it still says it cannot find the file. 我试图设置-Dfile1=file:///fullpath/file1 ，但是它仍然说找不到文件。 Is there any reason why this might happen other than that I am not seeing a simpler problem like a typo or something (which I have checked for many times)? 除了我没有看到像打字错误之类的更简单的问题（我已经检查了很多次）之外，是否有其他原因会导致这种情况发生？

More specifically, this.getClass().getClassLoader().getResourceAsStream(configurationFileName) is returning null . 更具体地说， this.getClass().getClassLoader().getResourceAsStream(configurationFileName)返回null 。

The file that is not being found is a configuration file (.properties), not a JAR file. 找不到的文件是配置文件（.properties），而不是JAR文件。

2 个解决方案

You set a classpath to point to a directory containing something or an archive containing resources. 您将classpath设置为指向包含内容的目录或包含资源的档案。 I don't believe you can add a resource directly to the classpath . 我不相信您可以直接将资源添加到classpath 。

Try setting your classpath to /file1path instead of /file1path/file1 尝试将classpath设置为/file1path而不是/file1path/file1

The classpath should specify the directory where your package hierarchy rooted. 类路径应指定软件包层次结构所在的目录。

package org.djna, file system : C:/myhome/javastuff/org/djna/Myclass.java 包org.djna，文件系统： C:/myhome/javastuff/org/djna/Myclass.java

classpath is set to c:/myhome/javastuff classpath设置为c:/myhome/javastuff

If you are trying to open files from your application using getResourceAsStream() or some such the the details of the path depend on whether or not the filename has a leading / . 如果您尝试使用getResourceAsStream()或类似方法从应用程序中打开文件，则路径的详细信息取决于文件名是否以/开头。 Read the docs caefully and all will become clear. 仔细阅读文档，一切都会变得清晰。