Hi,
this rule has a default severity of "blocker" and it flags uses of java.util.Stream if it's not closed.
However the javadoc for Stream states:
Streams have a close() method and implement AutoCloseable, but nearly all stream instances do not actually need to be closed after use. Generally, only streams whose source is an IO channel (such as those returned by Files.lines(Path, Charset)) will require closing. Most streams are backed by collections, arrays, or generating functions, which require no special resource management. (If a stream does require closing, it can be declared as a resource in a try-with-resources statement.)
I think this rule needs a way to add exceptions (so that Stream can be excluded), or maybe there should be a separate rule for java.util.Stream with a lower default severity.