Title: Message Title
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Initially reported in this thread:
http://dspace.2283337.n4.nabble.com/More-enterprise-deployment-questions-td4670528.html
The DSpace XMLUI seems to respond with a 500 response (rather than a proper 404) for some invalid paths which begin with "/static".
It only seems to occur for URLs of this format:
[dspace-xmlui-url]/static/*/*.js
[dspace-xmlui-url]/static/*/*.css
[dspace-xmlui-url]/static/*/*.json
In other words, the XMLUI path must start with "/static/", and it must end with either ".js", ".css" or ".json". So, it's a very specific URL structure that throws this 500 response (all others will return 404 responses). Here's some examples from the demo.dspace.org server:
The underlying error IS BENIGN. Essentially, what is going on here is that we have some special processing to allow institutions to easily add custom _javascript_ or CSS files to their themes. Those custom files become available on the "/static" path. See this line in the sitemap.xmap:
https://github.com/DSpace/DSpace/blob/master/dspace-xmlui/src/main/webapp/sitemap.xmap#L645
Currently, if someone attempts to reference a .js/.css/.json file which does NOT exist, DSpace code is unfortunately is throwing a Java NullPointerException (as it's failing to check if the requested file actually exists). Here's the line where the NullPointerException is thrown:
https://github.com/DSpace/DSpace/blob/master/dspace-xmlui/src/main/java/org/dspace/app/xmlui/cocoon/ConcatenationReader.java#L174
While this error is annoying, and the 500 response is incorrect, it is benign. No _javascript_ is being executed by DSpace. It's just an error where the underlying Java code is not checking for a possible "null" result (which only occurs when the requested *.js/*.css/*.json file is not found).
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