/usr/share/netbeans/platform13/modules/ext/junit-4.8.2.jar.external is in libnb-platform13-java 7.0.1+dfsg1-5ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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URL:m2:/junit:junit:4.8.2:jar
URL:http://repo1.maven.org/maven2/junit/junit/4.8.2/junit-4.8.2.jar
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