Environment variables in javaclasspath.txt

Question

Xeozim 2019-2-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/443285-environment-variables-in-javaclasspath-txt

评论： Yair Altman 2019-2-13

Hi,

I was whether the functionality for modifying the static path via javaclasspath.txt has any compatibility with environment variables.

I can't post code for security reasons, but I have to change a bunch of paths when I install a new version of the java software (delivered from another team), and I'm trying to eliminate as many of these as possible by referencing environment variables so I can just change one of them when the software is updated.

At the moment I have something like this in javaclasspath.txt

D:\somepath\version_number\subpath\to\file.jar

I wasn't sure if the windows syntax

%MY_ENV_VAR%\subpath\to\file.jar

would work, or maybe internal MATLAB syntax

[getenv('MY_ENV_VAR') "subpath\to\file.jar"]

Thanks in advance.

Dave

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Answer 1

Yair Altman 2019-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/443285-environment-variables-in-javaclasspath-txt#answer_360456

I do not believe that you can use env vars in your javaclasspath.txt file, but as workaround, you can programmatically load the necessary Java classes into the static Java classpath inside your Matlab code, as described in https://undocumentedmatlab.com/blog/static-java-classpath-hacks. Doing so enables you to programmatically set the path of the loaded classes.