java - 如何在Windows命令行中正确设置类路径

Question

我已经多次尝试输入命令以从终端正确运行 JAR 文件，并且我 100% 确定所有 JAR 文件等都位于给定路径中，但我不断收到 ClassDefNotFoundException。这与我输入命令的方式有什么关系吗？

C:\Users\ANNA\Downloads>"C:\Program Files\Java\jre1.8.0_45\bin\java.exe" 

-Djava.library.path="C:\Users\ANNA\Downloads\Windows64_Libjitsi\lib\native\windows-64"

-cp 

"C:\Users\ANNA\Downloads\SimplifiedConnectionProvider.jar;C:\Users\ANNA\Downloads\Windows64_Libjitsi" 

Core.PublicService

Exception in thread "main" java.lang.NoClassDefFoundError: org/jitsi/service/lib
jitsi/LibJitsi
at Core.PublicService.<clinit>(PublicService.java:38)
Caused by: java.lang.ClassNotFoundException: org.jitsi.service.libjitsi.LibJitsi

    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)
    ... 1 more

没用。再试一次:

C:\Users\ANNA\Downloads>"C:\Program Files\Java\jre1.8.0_45\bin\java.exe" -Djava.
library.path="C:\Users\ANNA\Downloads\Windows64_Libjitsi\lib\native\windows-64"
-cp C:\Users\ANNA\Downloads\SimplifiedConnectionProvider.jar;C:\Users\ANNA\Downl
oads\Windows64_Libjitsi Core.PublicService

Exception in thread "main" java.lang.NoClassDefFoundError: org/jitsi/service/lib
jitsi/LibJitsi
        at Core.PublicService.<clinit>(PublicService.java:38)
Caused by: java.lang.ClassNotFoundException: org.jitsi.service.libjitsi.LibJitsi

    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)
    ... 1 more

没用。再试一次:

C:\Users\ANNA\Downloads>"C:\Program Files\Java\jre1.8.0_45\bin\java.exe" -Djava.
library.path=C:\Users\ANNA\Downloads\Windows64_Libjitsi\lib\native\windows-64 -c
p C:\Users\ANNA\Downloads\SimplifiedConnectionProvider.jar;C:\Users\ANNA\Downloa
ds\Windows64_Libjitsi Core.PublicService
Exception in thread "main" java.lang.NoClassDefFoundError: org/jitsi/service/lib
jitsi/LibJitsi
        at Core.PublicService.<clinit>(PublicService.java:38)
Caused by: java.lang.ClassNotFoundException: org.jitsi.service.libjitsi.LibJitsi

        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)
        ... 1 more

请注意，类“org.jitsi.service.libjitsi.LibJitsi”实际上位于一个 JAR 文件中，其实际位置位于文件夹“C:\Users\Anna\Downloads\Windows64_Libjitsi”中，这是我尝试在命令行上指定的 JAR 文件。

Answer 1

您已将 JAR 添加到CLASSPATH，而不是包含此 JAR 的文件夹。因此 -cp 参数应该类似于 C:\Users\ANNA\Downloads\SimplifiedConnectionProvider.jar;C:\Users\ANNA\Downloads\Windows64_Libjitsi\the_name_of_the_JAR.jar.