Is it thread-safe to pool the PreparedStatement?

I just join a project, this existing team member of this project
concern performance a lot so their pool all PreparedStatements into a
map (probably not a nice optimization, but I have no say about that)
when the application start. And then reuse those preparedstatement
again and again.

I haven't get time to check all method call using those
preparedstatement are synchronized properly. If that is not the case,
is it thread-safe to pool the PreparedStatement?

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