/usr/share/netbeans/java5/modules/ext/junit-3.8.2.jar.external is in libnb-java5-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.
1 2 3 | CRC:857334496
URL:m2:/junit:junit:3.8.2:jar
URL:http://repo1.maven.org/maven2/junit/junit/3.8.2/junit-3.8.2.jar
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