passing environment variable to a java class in command line

Question

I have a necessity to read some properties from a file located in local etc/myconfig-config/ folder. I need to give this file path in the command line. I have given it as mentioned below. But there is an error and it displays like

Error: Could not find or load main class test-tool.jar.

the command given is

java  -cp -DconfigDir=/etc/myconfig-config/ test-tool.jar 
service.ScriptGenerator $clinic_count $client_files_count

can anybody please help me to resolve this.

thanks

Note that you are wanting to read a property at runtime, not an environment (System.getProperty("xxx") vs System.getenv("xxx")). — trebor
– trebor, Commented Aug 2, 2022 at 1:27

Community · Accepted Answer · 2023-06-13 10:01:47Z

20

Try giving following command,

java -DconfigDir=/etc/myconfig-config/ -cp test-tool.jar service.ScriptGenerator $clinic_count $client_files_count

Note that the given parameters should be accessed from code as follow:

System.getProperty("configDir")

edited Jun 13, 2023 at 10:01

CommunityBot

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answered Jun 17, 2015 at 10:57

Sathish

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5 Comments

Dilan Over a year ago

It work Sathish but when I put System.getenv("configDir") it prints null. Could you give a solution to this.... thanks

Sathish Over a year ago

Hi, use System.getProperty("configDir") insteadof getenv() method.

Dilan Over a year ago

Thanks a lot Sathish it works.... I ask this question if it is not a disturbance to u. When I run it through IDE the System.getenv("configDir") works fine. But when i run it through terminal using above command the System.getProperty("configDir") working fine.. I cannot think why is this...

Sathish Over a year ago

You are welcome Dilan, I did not get what is not working. Can you please explain? I'll try to help if i know the answer. Thanks !

Özgün Over a year ago

What dilan suggests set a SystemProperty in your JVM. Not an environment variable. Hence you cannot use it in your code via "getenv()" method. See this blog post to understand better how those two variables work for java applications homeofthewizard.github.io/secrets_in_java

Asif · Accepted Answer · 2020-11-23 11:01:01Z

4

Try this command

export VARNAME='variable-value'

Then run your Java main class from the same command line.

answered Nov 23, 2020 at 11:01

Asif

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Comments

Aakash · Accepted Answer · 2015-06-17 10:57:53Z

1

Your command should be like

java  -cp test-tool.jar -DconfigDir=/etc/myconfig-config/ service.ScriptGenerator $clinic_count $client_files_count

answered Jun 17, 2015 at 10:57

Aakash

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