Github user mmiklavc commented on the issue:
https://github.com/apache/metron/pull/1251
> Should the resolver throw if there is a call after it is closed?
> or just return nothing? Do we have a test for that? Either way we should.
What do you think of a no-op on multiple invocations of close? This would
be consistent with the `Closeable` interface.
```
/**
* Closes this stream and releases any system resources associated
* with it. If the stream is already closed then invoking this
* method has no effect.
...
*/
public void close() throws IOException;
```
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