feat: remove printStackTrace from exception handlers

[Copilot]

The codebase was printing stacktraces to System.err before re-throwing exceptions, implementing the "log and throw" anti-pattern. This forced stacktraces into console output even when callers intentionally ignored specific exceptions.

Changes

• Removed e.printStackTrace() calls from 4 exception handlers in JDBCBaseAdapter.java:
  • savePolicy()
  • addPolicies()
  • removePolicies()
  • updatePolicy()

Before:

} catch (SQLException e) {
    conn.rollback();
    
    e.printStackTrace();  // Forces output to System.err
    throw e;
}

After:

} catch (SQLException e) {
    conn.rollback();
    throw e;  // Caller decides how to handle
}

Exceptions are still thrown and can be logged by callers at the appropriate level.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Do not print stacktrace</issue_title>
<issue_description>"Log and throw" is considered an anti-pattern, because an exception should not be handled multiple times and it can lead to duplicate log entries.
(Also printing directly to System.err without using a logging facade is not nice ...)

In my opinion this line (and 3 more like it in the same file) should be removed:

jdbc-adapter/src/main/java/org/casbin/adapter/JDBCBaseAdapter.java

Line 379 in 490645a

e.printStackTrace();

In my case, I want to ignore a certain exception - which works fine - but I still see the satcktrace in the output, which I would not like to see.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Do not print stacktrace #83

---

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[hsluoyz]

@tangyang9464 @imp2002 please review

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.33%. Comparing base (490645a) to head (834c8dd).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #84   +/-   ##
=======================================
  Coverage   73.33%   73.33%           
=======================================
  Files           3        3           
  Lines          90       90           
  Branches       26       26           
=======================================
  Hits           66       66           
  Misses         13       13           
  Partials       11       11           

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