Unable to open Java Control Panel, inspite of having Java installed.

ajiten · 04-20-2024, 03:34 AM

Have java installed, and on using the command:

Code:

javaws -viewer

, am unable to open the Java Control Panel; inspite of the command able to open the same, in a youtube video.
Java Control Panel, is not appearing as an option in the 'Start panel' too.

The below is the list of commands, that shows the same.
//have the command 'control.exe' run to open the 'Control Panel', to open 'Programs'//

Code:

 
Microsoft Windows [Version 10.0.19045.4291]
(c) Microsoft Corporation. All rights reserved.

C:\Windows\system32>java -version
java version "20.0.1" 2023-04-18
Java(TM) SE Runtime Environment (build 20.0.1+9-29)
Java HotSpot(TM) 64-Bit Server VM (build 20.0.1+9-29, mixed mode, sharing)

C:\Windows\system32>javac -version
javac 20.0.1

C:\Windows\system32>echo %JAVA_HOME%
D:\Program Files\JAVA\

C:\Windows\system32>control.exe

C:\Windows\system32>javaws -viewer
'javaws' is not recognized as an internal or external command,
operable program or batch file.

C:\Windows\system32>

Edit: My system is a Windows 10 one, sorry for forgetting to specify the same earlier.

NevemTeve · 04-20-2024, 03:47 AM

I would say it is `javacpl.exe` Nonetheless (as far as I know) javaws (i.e. Java Web Start) has been removed from newer java versions.
https://en.wikipedia.org/wiki/Java_Web_Start

The replacement is Iced-Tea-Web: https://en.wikipedia.org/wiki/IcedTea#IcedTea-Web

ajiten · 04-20-2024, 04:05 AM

Quote:

Originally Posted by NevemTeve

I would say it is `javacpl.exe` Nonetheless (as far as I know) javaws (i.e. Java Web Start) has been removed from newer java versions.
https://en.wikipedia.org/wiki/Java_Web_Start

The replacement is Iced-Tea-Web: https://en.wikipedia.org/wiki/IcedTea#IcedTea-Web

Sorry, but asked about a Command-Prompt command; and am unable to find in the 'bin' folder, the 'javacpl.exe' file.

-----------------------

Edit: My system is a Windows 10 one, sorry for forgetting to specify the same earlier.

NevemTeve · 04-20-2024, 05:26 AM

It can be D:\Progra~1\JAVA\bin
It's yourself who can find files on your computer.

ajiten · 04-20-2024, 06:11 AM

Quote:

Originally Posted by NevemTeve

It can be D:\Progra~1\JAVA\bin
It's yourself who can find files on your computer.

Don't know why you are so confident that the exe file: javacpl.exe, must be there in the 'bin' folder.
If you allow screenshot, then could show; but now how to show that the stated exe file is not there, is unclear.

NevemTeve · 04-20-2024, 06:59 AM

Maybe an example could help. (I have a Java8 installed in directory c:\Java8)

Code:

Microsoft Windows [Version 10.0.22000.2777]
(c) Microsoft Corporation. Minden jog fenntartva.

C:\Users\lorinczy>set JAVA_HOME=C:\JAVA8

C:\Users\lorinczy>set PATH=%JAVA_HOME%\BIN;%PATH%

C:\Users\lorinczy>where javacpl.exe
C:\JAVA8\bin\javacpl.exe

C:\Users\lorinczy>javacpl.exe
<after a short delay a window titled 'Java Control Panel' appears>
C:\Users\lorinczy>

NevemTeve · 04-20-2024, 07:24 AM

Googled around a bit, and I have some bad news:

- javacpl.exe exists only in Oracle Java, but only in versions before 11
- it is missing from OpenJDK altogether

The same is true for javaws.exe: it never existed in OpenJDK, and has been deleted from Oracle Java in version 11

The replacement product is Called 'IcedTea-Web', it has a program called 'javaws.exe' and an 'itweb-settings.exe', the latter is similar to the Control Panel.

https://adoptopenjdk.net/icedtea-web.html

Note: the name of the binary is javacpl.exe in Windows, but ControlPanel in Unix. It might have something to do with the 8+3 limit in Dos/Windows3.x

sundialsvcs · 04-21-2024, 08:48 PM

Unfortunately, over many years I have had tremendous issues with "Java." On Windows and on MacOS (OS/X). Control panels and installation/update procedures which "simply didn't work." I've reported these issues as best I could but they still persist.

Also equally irritating (to me ...) is the obvious fact that "Java is a constantly-moving target." The technology doesn't impress me much . . .