空解除引用强化问题

Question

我正在努力修复代码库中的强化发现，扫描返回空取消引用发现。建议我向 csvWriter 添加空检查，但说实话我并不完全知道这意味着什么。有人能指出我正确的方向吗？谢谢。

    private void writeBadRecordFile() {

        CsvWriter csvWriter = null;

        try {
            badRecordFile = File.createTempFile("BadRecords", ".csv");
            badRecordFile.deleteOnExit();

                FileWriter writer = new FileWriter(badRecordFile);

                csvWriter = new CsvWriter(writer, ',');
                String[] header = {"BIC"};

                csvWriter.writeRecord(header);

                for (String badRecord : badRecords) {

                    csvWriter.write(badRecord);
                    csvWriter.endRecord();
                }

                csvWriter.flush();

            } catch (IOException e) {
                errorMessage = "Bad records were detected in the uploaded file, but the bad record file was not able to be created.";
                e.printStackTrace();

            } finally {

                csvWriter.close();
            }
        }

Answer 1

如果 try 块的前三行失败，则 csvWriter 仍为 null，并且 finally 块运行 csvWriter.close 将抛出 NullPointerException。 linter 建议您

if (csvWriter != null) {
  csvWriter.close();
}

在 finally 块中执行此操作。或者，更好的是，使用 Java 的 try-with-resources 语句完全放弃这个问题。