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If only one exception is thrown, either during opening, processing, or closing of the files, the exception will be printed after "thrown exception:". If an exception is thrown during processing, and a second exception is thrown while trying to close either file, the second first exception will be printed after "thrown exception:", and the first second exception will be printed after "suppressed exception:".
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Failing to correctly handle all failure cases when working with closeable resources may result in some resources not being closed or in important exceptions being masked, possibly resulting in a denial of service. Note that failure to use a try-with-resources statement cannot be considered a security vulnerability in and of itself because it is possible to write a correctly structured group of nested try-catch-finally blocks guarding the resources that are in use (see ERR05-J. Do not let checked exceptions escape from a finally block). That said, failure to correctly handle such error cases is a common source of vulnerabilities. Use of a try-with-resources statement mitigates this issue by guaranteeing that the resources are managed correctly and that exceptions are never masked.
Automated Detection
| Tool | Version | Checker | Description | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Parasoft Jtest |
| CERT.ERR54.CLFIN | Avoid using finally block for closing resource only | ||||||
| SonarQube |
| S2093 |
Bibliography
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