要进入大学课程，我需要使用命令行执行 JNPL 文件（因为 Chrome 或 Firefox 无法播放音频）：
user@computer:~$ sudo javaws '/home/user/Downloads/CiscoWebExServlet'
不幸的是，我没有进入会议，而是收到了一个错误：
证据在这里：图片
另外，这是我尝试加载文件时的终端消息：
user@computer:~$ sudo javaws '/home/user/Downloads/CiscoWebExServlet'
[sudo] password for user: ****
selected jre: /usr/lib/jvm/default-java
WARNING: package javax.jnlp not in java.desktop
冰茶正在初始化，当它最终加载时，我在终端中收到以下消息：
Unable to use Firefox's proxy settings. Using "DIRECT" as proxy type.
sun.misc.Launcher not found. Running jdk9 or higher? Using unsecure BootClassLoader
Codebase matches codebase manifest attribute, and application is signed. Continuing. See: http://docs.oracle.com/javase/7/docs/technotes/guides/jweb/security/no_redeploy.html for details.
Starting application [JDownload] ...
Sep 16, 2020 2:01:54 PM JDownload main
INFO: Webex java-service JNLP application start...
Sep 16, 2020 2:01:54 PM JDownload getCommandLine
INFO: Webex java-service JNLP application parameters:
aHR0cHM6Ly91bmlhbmRlcy53ZWJleC5jb20vdW5pYW5kZXMvam1mX3dlYi5waHA/QVQ9VEMmY29uZmlkPTE3MjU1OTY1NjQwMTUxMTM1MyZ1aWQ9LTg5ODI5NzEyJmZsYWc9MHwwJmpubHA9MSZlbWFjPVNESlRTd0FBQUFTVkF4bU9KVEUxRFRmX3ZFUkE1SGFWT1QxeDFYLTVUTE96aU5FMUJQQnItQTI=, https://uniandes.webex.com/client/T33L/javaclient/training/, .webex, T33_TC
JDownload version 2020.06.04.4006.0200
Java version: 11.0.8
Java home: /usr/lib/jvm/java-11-openjdk-amd64
OS name: Linux
OS arch: amd64
OS version: 5.4.0-47-generic
[JDownload]getParameter: pname = ParmArchive return
https://uniandes.webex.com/client/T33L/javaclient/training/
[JDownload]Decode: str=https://uniandes.webex.com/client/T33L/javaclient/training/ return
https://uniandes.webex.com/client/T33L/javaclient/training/
[JDownload]Java Client Service home: https://uniandes.webex.com/client/T33L/javaclient/training/
[JDownload]getParameter: pname = GpcProductRoot return
.webex
[JDownload]Decode: str=.webex return
.webex
[JDownload]getParameter: pname = GpcProductVersion return
T33_TC
[JDownload]Decode: str=T33_TC return
T33_TC
[JDownload]Production home: /root/.webex/T33_TC
[utils.CKit]### cache put key=JAPPLET_INST
value=JDownload[panel0,0,0,0x0,invalid,layout=java.awt.BorderLayout,rootPane=javax.swing.JRootPane[,0,0,0x0,invalid,layout=javax.swing.JRootPane$RootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777673,maximumSize=,minimumSize=,preferredSize=],rootPaneCheckingEnabled=true]
XXX Failed to request URL: https://uniandes.webex.com/uniandes/jmf_web.php?AT=TC&confid=172559656401511353&uid=-89829712&flag=0|0&jnlp=1&emac=SDJTSwAAAASVAxmOJTE1DTf_vERA5HaVOT1x1X-5TLOziNE1BPBr-A2
Sep 16, 2020 2:01:55 PM JDownload run
SEVERE: Failed to download client parameter!
utils.JCKit$WbxJCStartError: Failed to download client parameter!
at utils.JCKit.initJCKit(JCKit.java:182)
at JDownload.initJCKit(JDownload.java:443)
at JDownload.run(JDownload.java:239)
at java.base/java.lang.Thread.run(Thread.java:834)
编辑#1：今天之前，老师直接从互联网浏览器创建了 WebEx 会议（运行良好），但是他遇到了连接问题，因此大学本身决定采取另一种替代方案（即我无法直接从浏览器打开的方案）。
编辑＃2：当我关闭错误对话框时，我收到：
Sep 16, 2020 2:26:08 PM JDownload destroy
INFO: destroy.
java.lang.Exception: destroy debug
at JDownload.destroy(JDownload.java:1137)
at JDownload.onAppError(JDownload.java:1343)
at JDownload.run(JDownload.java:380)
at java.base/java.lang.Thread.run(Thread.java:834)
Sep 16, 2020 2:26:08 PM JDownload destroy
INFO: destroy...