Exception when writing transactions in Neo4j python driver: "neo4j.exceptions.AuthError: {code: None} {message: None}"

Question

我正在尝试运行文档中提到的示例 - https://neo4j.com/developer/python/#_resources

class HelloWorldExample:

    def __init__(self, uri, user, password):
        self.driver = GraphDatabase.driver(uri, auth=(user, password))

    def close(self):
        self.driver.close()

    def print_greeting(self, message):
        with self.driver.session() as session:
             greeting = session.write_transaction(self._create_and_return_greeting, message)
             print(greeting)

    @staticmethod
    def _create_and_return_greeting(tx, message):
        result = tx.run("CREATE (a:Greeting) "
                    "SET a.message = $message "
                    "RETURN a.message + ', from node ' + id(a)", message=message)
        return result.single()[0]


if __name__ == "__main__":
    greeter = HelloWorldExample("bolt://localhost:7687", "neo4j", "password")
    greeter.print_greeting("hello, world")
    greeter.close()

错误是-

Traceback (most recent call last):
  File "createneodb.py", line 26, in <module>
    greeter.print_greeting("hello, world")
  File "createneodb.py", line 13, in print_greeting
    greeting = session.write_transaction(self._create_and_return_greeting, message)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\work\simple.py", line 435, in write_transaction
    return self._run_transaction(WRITE_ACCESS, transaction_function, *args, **kwargs)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\work\simple.py", line 336, in _run_transaction
    self._open_transaction(access_mode=access_mode, database=self._config.database, metadata=metadata, timeout=timeout)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\work\simple.py", line 271, in _open_transaction
    self._connect(access_mode=access_mode, database=database)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\work\simple.py", line 122, in _connect
    bookmarks=self._bookmarks
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 805, in acquire
    return self._acquire(self.address, timeout)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 660, in _acquire
    connection = self.opener(address, timeout)
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 789, in opener
    **pool_config
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 340, in open
    connection.hello()
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\_bolt4.py", line 98, in hello
    self.fetch_all()
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\__init__.py", line 517, in fetch_all
    detail_delta, summary_delta = self.fetch_message()
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\_bolt4.py", line 271, in fetch_message
    response.on_failure(summary_metadata or {})
  File "C:\Users\omras\AppData\Local\Programs\Python\Python37\lib\site-packages\neo4j\io\_common.py", line 202, in on_failure
    raise AuthError(message)
neo4j.exceptions.AuthError: {code: None} {message: None}

详情：

驱动程序对象和会话对象已成功初始化。然而，问题出在调用 write_transaction 时。我无法理解问题的根源。

Answer 1

我最近遇到了这个错误，最终原因是我的 username/password 出了问题。我在引用的配置文件中把它们弄错了。这令人困惑，因为错误直到我调用 .run() 方法的那一行才出现，即使我在代码的前面建立了会话。

Answer 2

以下是部分答案 — 最初可以设置您的密码，但您可能无法更改它。

要从命令行初始设置密码，运行 sudo /usr/bin/neo4j-admin set-initial-password YOUR_PASSWORD_HERE。
或者，您可以运行对 neo4j 服务器的 curl 请求，如 here 所述。
如果您已经设置了密码，您可能需要删除 auth.ini 文件（关于 here 的更多信息）。
使用 sudo neo4j restart 重新启动服务器，这样它就会接受您的新密码。在 debian 上，如果你不使用 sudo，它就会超时。

就个人而言，我可以设置密码，但现在无法更改。我不确定这是否是一个错误，但命令行和 curl 重置方法都报告成功而无需更改密码，即使在重新启动后也是如此。

Exception when writing transactions in Neo4j python driver: "neo4j.exceptions.AuthError: {code: None} {message: None}"

Exception when writing transactions in Neo4j python driver: "neo4j.exceptions.AuthError: {code: None} {message: None}"

neo4j

neo4j-python-driver