How can I find all instances and objects in my code that are not closed?

Question

My team has quite a huge amount of code. Recently I have found some objects that weren't closed properly.
How can i find all the instances that are not closed or not inside a try-with-resources block?
Some objects like Statement, ResultSet are not showing warning messages for it, even.

Is there an extension tool for showing all this occurrences?
I'm using Eclipse.

Answer 1

Static code analysis tools like Sonar should find all those occurrences and warn you about them.
IDEA IntelliJ's inspection profiles also includes some rules for that (Settings > Editor > Inspections > Java > Resource management issues, or just filter by "close" inside Inspections).

I see that you're using Eclipse. You can probably install the FindBugs Eclipse plugin, which includes a couple of rules to check if resources are properly closed.