Using environment variable in Java

[darangho]

Hi All,

I am trying to extract a full path from a certain environment variable.

What if there is an environment vaiable called CATALINA_HOME
how can I extract a full path of the environment from java?

I am trying to use a filewriter object to create a file,

for example,

FileWriter writer = new FileWriter("%CATALINA_HOME%\\test.csv");
writer.append("test");
writer.close();

but it is not recognizing the environment variable.

Thank you.

[jwenting]

Of course it isn't.
You need to first get the value of that variable from the environment yourself, and then use that to construct the actual path to write to.

[HansWurst]

Perhaps

String variable = System.getenv("MY_ENV_VARIABLE");

might be useful.