Posts tagged ControlPanel

Servers and Java WebGUI problems

posted on 2016-02-29 16:59:00

Often server and device manufacturers do ship their hardware with java-based administration hardware. Even more often, this stuff does not properly work due to your local java install not being up to date or complete. And if your installation is fine, the access to the server in place is restricted by security policies. (...)

Note: this guide is mostly linux specific. For Windows or OSX the steps may differ, even though Java is the same.

Most general steps for using these particular kinds of software are klicking a link, and getting a .jnlp file donwload offered. Afterwards you have to double klick that file, or maybe your system already knows how to open it. Java should start and lets your application run then.

If not, here are solutions to the most common problems.

no java web start application to start

  • no proper programm for running the java application

If you can donwload the .jnlp file, but cannot open it (even though you know you installed java!), it is simply lacking the proper program. Where your java binary is located, there must also exist a javaws binary ("Java Web Start"), which you need to open these files.

Either your system does not use javaws for starting them, but just download and try from the shell:

javaws <filename>.jnlp

Verify it is installed at all:

javaws -version

(All Java programs only use a single dash for their flags, only god knows why.)

app start prohibited due to security policy problems

In your shell, either one of these should work:

# or

Then the Java Control Panel should start.

Do ist

Choose the Security tab, and add your site URL to the Exception Site List. Afterwards your app should start upon reopening the .jnlp file.

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