src/main/java/org/apache/commons/dbcp2/PoolableCallableStatement.java [87:98]:
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    public void close() throws SQLException {
        // calling close twice should have no effect
        if (!isClosed()) {
            try {
                pool.returnObject(key, this);
            } catch (final SQLException | RuntimeException e) {
                throw e;
            } catch (final Exception e) {
                throw new SQLException("Cannot close CallableStatement (return to pool failed)", e);
            }
        }
    }
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src/main/java/org/apache/commons/dbcp2/PoolablePreparedStatement.java [103:114]:
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    public void close() throws SQLException {
        // calling close twice should have no effect
        if (!isClosed()) {
            try {
                pool.returnObject(key, this);
            } catch (final SQLException | RuntimeException e) {
                throw e;
            } catch (final Exception e) {
                throw new SQLException("Cannot close preparedstatement (return to pool failed)", e);
            }
        }
    }
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