Develop Reference

java -cp/javac doesn't work in cmd prompt

I am trying to run mo program by cmd :
first i try to compile my Main.java by "javac Main.java", after that i have no msg in cmd
second i run "java -cp Main"(Main.class with byte code), after that i have no output in cmd
I tryed reinstall my JDK, but it doesn't help. also when i run "java -version" in cmd i have no output. and no msg.I has set my JAVA_HOME path into JDK dir and set him into my PATH "%JAVA_HOME\bin". what i cant do wrong? Pls help

Your path environment variable for java is not set correctly. You could try to run the command where java and most likely it will return a path that is not correct (or nothing).
Find the correct path where your JDK is installed and run this command to add it to the path vars in cmd:
set PATH=%PATH%;C:\your\path\here\
An example for my system and path would be:
set PATH=%PATH%;C:\Program Files\Java\jdk-11\bin
After setting this path variable, close and reopen your cmd window and try running java -version again.
If it still doesn't show anything then you have to manually change your path variables and remove the old path.

Make sure that you have correctly set the path to the directory in which you have your java installed. For instance mine is settled in D:\Program files\java\jdk-11.0.2
Subsequently I set JAVA_HOME as
Then you open path variable and new entry as following:
Then save all changes. Close all running cmd, start it again and then retry java -version

How to add Maven to the Path variable windows 10?

Then I tried to add it to the path of Windows 10 as below:
Right click on my computer
Properties
Advanced System Setting
Environment Variable
New user variable and added Maven_Home with value:
C:\Users\Dell\Desktop\Selenium Course\apache-maven-3.8.1\bin
Add it to path variable with:
C:\Program Files (x86)\Common Files\Oracle\Java\javapath;%MAVEN_HOME%\bin;
Open cmd and ask for mvn -version in desktop
CMD : 'mvn' is not recognized as an internal or external command, operable program or batch file.
Any help please

Inside System variables add:
Variable name: MAVEN_HOME
Variable value: \apache-maven-3.8.4
Then on your path add:
%MAVEN_HOME%\bin
Don't forget to restart your terminal. Then check if it's working with the command mvn -version.

Javac not recognised even after setting variable path, Windows 10?

I'm getting an error when typing javac in command prompt.
C:\Users\HP>javac
javac is not recognized as an internal or external command, operable program or batch file.
C:\Users\HP>set path
path=C:\Program Files\Java\jdk-10\bin;C:\Program Files\Java\jre-10\bin\javaw.exe;C:\Program Files\Java\jdk-10\bin;C:\Program Files\Java\jre-10\bin;
PATHEXT=C:\Program Files (x86)\Documents;
I have already set Path in both system and user scope environment varible?

You may set 2 system variable from console:
set JAVA_HOME="c:\Program Files\Java\jdk1.8.0_144"
set PATH=%JAVA_HOME%\bin;%PATH%
then your command "javac" will be found.

The PATH variable looks corrupted. Moreover, the PATHEXT variable is totally confused. Their default value in Windows 7/10/2008 (assuming the system drive is C:) should be as follows:
PATH C:\Windows\System32\;C:\Windows\;C:\Windows\System32\Wbem;{plus program paths}
PATHEXT .COM; .EXE; .BAT; .CMD; .VBS; .VBE; .JS ; .WSF; .WSH; .MSC
Check output from SET PATH in a freshly open cmd window. If path and pathext look as above then use (modify directory names to match current Java version):
set "JAVA_HOME=C:\Program Files\Java\jre-9.0.4"
set "PATH=%JAVA_HOME%\bin;%PATH%"
Above setting is temporary (would last only for current cmd session). For persistent solution, there are more tutorials on the net e.g. How To Set Java Path & Java Home Variables (Windows, MacOS, Ubuntu).

Try out the following solutions.
Close your current cmd and Open a new cmd.exe
Restart the computer
NOTE: If cmd is open when you set the environment variables, then, that property will not be available until unless you open new cmd.

On Windows 10, the problem of 'javac is not recognized ...' can be fixed in these 4 steps:
Step 1: Install JDK to specific path (Example: C:\jdk-15)
Step 2: Setup JAVA_HOME environment variable to the installation folder
Windows --> Advanced settings --> Environment variables --> System Variable
--> Add new variable
JAVA_HOME = C:\jdk-15
Step 3: Prefix JAVA_HOME\bin to PATH variable of Windows
Windows --> Advanced settings --> Environment variables --> System Variables
--> Update PATH variable
PATH = JAVA_HOME\bin;..... old value of PATH variable ....
Step 4: Try the javac and java commands in new command window
Note: Already opened command windows will not take the new values of JAVA_HOME or PATH. The test needs to be done in new window opened after the environment variables are changed and saved.
C:\Users\user1> javac -version
C:\Users\user1> java -version

Unable to set Java Path in system variables (Windows 10)

I've tried adding JAVA_HOME with the directory - C:\Program Files\Java\jdk1.8.0_121 to my system variables, and then adding %JAVA_HOME%/bin to Path variable and this didn't work and I receive
'java' is not recognized as an internal or external command, operable
program or batch file.
So I've tried adding C:\Program Files\Java\jdk1.8.0_121; directly to the path variable but I still get the above error. Does anyone have any suggestions please?
Thanks
PS - The image shows me in the command prompt at C:\Program Files\Java\jdk1.8.0_121 trying 'java -version' - I just moved up one dir to test the variable, entering 'java -version' in the bin directory returns the correct info, as you would expect.

Did you try closing that command prompt and reopening it?

In the command line, run the following:
set PATH=%PATH%:C:\Program Files\Java\jdk1.8.0_121\bin
Without exiting the shell, run your java commands
E.g.
java -version
This will surely work.

Windows 7 command line jps not working

Others have asked this question but the answer is usually the same and not helpful to my problem. I installed JDK, and added C:\Program Files\Java\jdk1.7.0_25\bin to the path system variable. I checked, jps.exe is in that directory. I restarted my computer but still have had no luck. When I run jps I get the error:
'jps is not recognized as an internal or external command, operable command or batch file'
When I run C:\Program Files\Java\jdk1.7.0_25\bin\jps.exe on the command line it works fine. Working in Windows 7.

Mildly obvious mistake, but I realize that I had spaces in between the directories in my path and that caused them to not be recognized. So I had %OTHER_PATH%; C:\Program Files\Java\jdk1.7.0_25; %ANOTHER_PATH%, which I just had to switch to %OTHER_PATH%;C:\Program Files\Java\jdk1.7.0_25;%ANOTHER_PATH%

Your JDK bin directory does not exist in PATH variable.
To add this you need to do below steps.
Go to "Control Panel >> System >> Advanced system settings >>
Environment Variables
Click 'Path' from System variables
Click Edit.
Now add the path "C:\Program Files\Java\jdk1.8.0_72\bin"
Now open command window and write jps. It will work now.

In addition to the above solutions, still if you have issue with jps command, Please check whether the default system installed java(JRE) path is already available in the Path variable.
My case i faced the same issue and observed the following path already available in the path variable.
"C:\Program Files (x86)\Common Files\Oracle\Java\javapath"
So I had to change the position(move up) of my new JAVA_HOME path, new JAVA_HOME path is above the default oracle javapath.