Hi,

I am new to the license-maven-plugin and am currently playing around with 
the https://www.mojohaus.org/license-maven-plugin/ to try to understand how 
it works.
If possible, my end goal is to (1) download licenses (2) into a

licenses/<SPDX License ID>/LICENSE.txt

subfolder in our project.
The subfolder part (2) can be steered _somewhat_ with the 
licensesOutputDirectory, but I don't see how I could get a <SPDX license 
ID> folder into that path. Is it possible somehow?

Playing around with spdx IDs I found this configuration. 

          <licenseUrlFileNames>
            <spdx/>
          </licenseUrlFileNames>

But when using it I get e.g. this

[ERROR] Failed to execute goal 
org.codehaus.mojo:license-maven-plugin:2.3.0:download-licenses 
(default-cli) on project em-permission-one-common-case: URL 
'http://glassfish.java.net/public/CDDL+GPL_1_1.html' returned content with 
unexpected sha1 '977f24cd0704c80f9558dffcc9ded18d84adf6ea'; expected 
'047abb20f37c1629c82db23d99783e41207c2564'. You may want to (a) re-run the 
current mojo with -Dlicense.forceDownload=true or (b) change the expected 
sha1 in the licenseUrlFileNames entry 'CDDL-1.1-047abb2.html' or (c) split 
the entry so that its URLs return content with different sha1 sums. -> 
[Help 1]

when running

mvn -X license:download-licenses

or 

mvn -X license:download-licenses  -Dlicense.forceDownload=true

My understanding is that the contents of the license from

http://glassfish.java.net/public/CDDL+GPL_1_1.html

has changed compared to what the license-maven-plugin expects. 

Where does the _expected_ sha1 come from?

Is it normal that licenses on these kinds (I suspect they are never 
_supposed_ to be changed..? If a new license version is needed then there 
would be a new URL, right?) of URLs change?

Thanks in advance,
Joachim

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