为什么这个 javac: File Not Found 错误?

问题描述

在 CentOS 5 linux 上使用一些基本的 java 应用程序，我将 classpath 设置为指向 home/pathToJava/bin，其中包含 javac 和 java

Working with some basic java apps on CentOS 5 linux and I have my classpath set to point to home/pathToJava/bin which contains javac and java

并且我在 home/pathToFolderA/src

和home/pathToFolderB/gen-java

当我在 home/pathToFolderA/src 中运行 javac 和 java 时，一切正常

When I run javac and java in home/pathToFolderA/src everything works perfectly

但是当我在 fileName.java 上的 home/pathToFolderB/gen-java 中运行 javac 时，我得到一个文件未找到错误，具体

But when I run javac from within home/pathToFolderB/gen-java on fileName.java I get a file not found error, specifically

javac: file Not found: fileName.java
Usage: javac <options> <source files>

为什么会发生这种情况?

Why could this be happening?

感谢大家的帮助

推荐答案

您不应该将 classpath 设置为指向您的 JDK bin 目录——而应该是 PATH 环境变量，它与类路径有不同的用途.(类路径定义了一个包含已编译 Java .class 代码的 jar 和目录列表；PATH 变量定义了一个路径列表，当在当前目录中找不到它们时，shell 需要在其中查找和定位要执行的程序——所以如果你键入例如 zip -- 它会查看 PATH 中定义的所有目录并找出 zip 程序位于 /usr/bin)其次，如果你想从两个目录编译源代码，你需要指定:

You shouldn't set your classpath to point to your JDK bin directory -- instead it should be the PATH environment variable, which serves a different purpose to classpath. (The classpath defines a list of jars and directories containing compiled Java .class code; the PATH variable defines a list of paths where the shell needs to look and locate programs to execute when they are not found in the current directory -- so if you type for instance zip -- it would look in all the directories defined in PATH and figure out that zip program is located under /usr/bin)Secondly if you want to compile sources from both directory you need to specify:

• 来源所在的所有路径(home/pathToFolderA/src 和 home/pathToFolderB/gen-java)
• 编译后的.class文件生成路径
• 在类路径中指定您可能在源文件中使用的任何库

总结起来就是这样编译:

To sum it up, it would be something like this to compile:

javac -d /home/pathToFolderWithResultsOfCompilation -classpath /path/to/some.jar:/path/to/another.jar home/pathToFolderA/src/*.java home/pathToFolderB/gen-java/*.java

并运行您编译的程序:

java -classpath /path/to/some.jar:/path/to/another.jar:/home/pathToFolderWithResultsOfCompilation full.name.of.your.Java

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