validation时，MongoDB java驱动程序3.0无法捕获exception
我是超级卡住o_0在尝试通过Java驱动程序进行身份validation时，存在捕获exception的问题。 你可能会看到甚至Throwable类都不起作用
private MongoClient mongoClient; private MongoDatabase mongoDatabase; public MongoConnection(String login, String password) { try { mongoClient = new MongoClient(asList(new ServerAddress("localhost"), new ServerAddress("localhost:27017")), singletonList(MongoCredential.createCredential(login, "cookbook", password.toCharArray()))); this.mongoDatabase = mongoClient.getDatabase("cookbook"); } catch (Throwable e) { System.out.println("exception"); } }
仍然没有抓住exception
INFO: Adding discovered server localhost:27017 to client view of cluster Jan 29, 2016 7:46:27 PM com.mongodb.diagnostics.logging.JULLogger log INFO: Exception in monitor thread while connecting to server localhost:27017 com.mongodb.MongoSecurityException: Exception authenticating MongoCredential{mechanism=null, userName='asdasdasdasd', source='cookbook', password=, mechanismProperties={}} at com.mongodb.connection.SaslAuthenticator.authenticate(SaslAuthenticator.java:61) at com.mongodb.connection.DefaultAuthenticator.authenticate(DefaultAuthenticator.java:32) at com.mongodb.connection.InternalStreamConnectionInitializer.authenticateAll(InternalStreamConnectionInitializer.java:99) at com.mongodb.connection.InternalStreamConnectionInitializer.initialize(InternalStreamConnectionInitializer.java:44) at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:115) at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:127) at java.lang.Thread.run(Thread.java:745) Caused by: com.mongodb.MongoCommandException: Command failed with error 18: 'Authentication failed.' on server localhost:27017. The full response is { "ok" : 0.0, "code" : 18, "errmsg" : "Authentication failed." } at com.mongodb.connection.CommandHelper.createCommandFailureException(CommandHelper.java:170) at com.mongodb.connection.CommandHelper.receiveCommandResult(CommandHelper.java:123) at com.mongodb.connection.CommandHelper.executeCommand(CommandHelper.java:32) at com.mongodb.connection.SaslAuthenticator.sendSaslStart(SaslAuthenticator.java:95) at com.mongodb.connection.SaslAuthenticator.authenticate(SaslAuthenticator.java:45)
最新版本的MongoDB java API在一个单独的守护程序监视器线程中抛出连接exception，这就是为什么你无法捕获它 – 运行器在你的堆栈跟踪中： com.mongodb.connection.DefaultServerMonitor $ ServerMonitorRunnable.run
要监视MongoDB客户端的exception，可以添加一个侦听器，允许您对可能发生的任何exception进行操作，并在需要时随时检查连接状态。 您仍然无法捕获这些exception，但至少应该让您的应用程序了解它们。 需要注意的一点是，连接建立（或失败）可能需要一些时间，所以如果您只想创建一次性使用连接，我建议实现一个检查连接的睡眠循环OK和失败/exception状态。 我使用3.3版（ https://api.mongodb.com/java/3.3/ ）编写了这个解决方案：
public class MongoStatusListener implements ServerListener { private boolean available = false; public boolean isAvailable() { return available; } @Override public void serverOpening(ServerOpeningEvent event) {} @Override public void serverClosed(ServerClosedEvent event) {} @Override public void serverDescriptionChanged(ServerDescriptionChangedEvent event) { if (event.getNewDescription().isOk()) { available = true; } else if (event.getNewDescription().getException() != null) { //System.out.println("exception: " + event.getNewDescription().getException().getMessage()); available = false; } } } public MongoClient getMongoClient(String login, String password) { if (mongoClient != null) { return mongoClient; } MongoClientOptions.Builder optionsBuilder = new MongoClientOptions.Builder(); MongoStatusListener mongoStatusListener = new MongoStatusListener(); optionsBuilder.addServerListener(mongoStatusListener); this.mongoClient = new MongoClient(asList(new ServerAddress("localhost"), new ServerAddress("localhost:27017")), singletonList(MongoCredential.createCredential( login, "cookbook", password.toCharArray()) ), optionsBuilder.build()); this.mongoDatabase = mongoClient.getDatabase("cookbook"); return mongoClient; } public boolean isAvailable() { return mongoStatusListener.isAvailable(); }