Java 如何添加 jar 文件并使用命令提示符进行编译？（错误：发生 JNI 错误，请检查您的安装）
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How to add jar files and compile using command prompt? (Error: A JNI error has occured,Please Check your Installation)
提问by Pratik
I forked one project from github and when i want to run it gives error. I added org.jsonjar file to jdk\liband also set the Path variable to it. I compiled code but it got no errors but when i run it i get exception as follows : (and I am running it using command prompt)
我从 github 分叉了一个项目，当我想运行它时出错。我向其中添加了org.jsonjar 文件，jdk\lib并为其设置了 Path 变量。我编译了代码，但没有错误，但是当我运行它时，我得到如下异常：（我使用命令提示符运行它）
Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.NoClassDefFoundError: org/json/JSONExceptio n at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Unknown Source) at java.lang.Class.privateGetMethodRecursive(Unknown Source) at java.lang.Class.getMethod0(Unknown Source) at java.lang.Class.getMethod(Unknown Source) at sun.launcher.LauncherHelper.validateMainClass(Unknown Source) at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source) Caused by: java.lang.ClassNotFoundException: org.json.JSONException at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source)... 7 more
Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.NoClassDefFoundError: org/json/JSONExceptio n at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Unknown Source) at java.lang.Class.privateGetMethodRecursive(Unknown Source) at java.lang.Class.getMethod0(Unknown Source) at java.lang.Class.getMethod(Unknown Source) at sun.launcher.LauncherHelper.validateMainClass(Unknown Source) at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source) Caused by: java.lang.ClassNotFoundException: org.json.JSONException at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source)……还有 7 个
采纳答案by ankhzet
Add required jar to classpath like this:
将所需的 jar 添加到类路径，如下所示：
For *nix-like systems:
export CLASSPATH=<path-to-app>/myapp.jar:<path-to-app>/lib/json.jar:. java MyAppFor Windows:
set CLASSPATH=<path-to-app>/myapp.jar;<path-to-app>/lib/json.jar;. java MyApp
对于 *nix 类系统：
export CLASSPATH=<path-to-app>/myapp.jar:<path-to-app>/lib/json.jar:. java MyApp对于 Windows：
set CLASSPATH=<path-to-app>/myapp.jar;<path-to-app>/lib/json.jar;. java MyApp
...or via manifest:
...或通过清单：
Manifest-Version: 1.0
Main-Class: MyApp
Class-Path: /lib/json.jar
