登录时 Smack 4.2.0 NullPointerException

Question

我对使用 Smack 还是个新手 API。我在尝试登录时遇到此异常。

这是我的代码：

XMPPTCPConnectionConfiguration configuration = XMPPTCPConnectionConfiguration.builder()
                .setUsernameAndPassword(username, password)
                .setXmppDomain(domain)
                .setHostAddress(InetAddress.getByName(host))
                .setPort(port)
                .build();
XMPPTCPConnection connection = new XMPPTCPConnection(configuration);
connection.connect();
connection.login();

这是我的日志：

Exception in thread "main" java.lang.NullPointerException
at java.util.Collections$UnmodifiableCollection.<init>(Collections.java:1026)
at java.util.Collections$UnmodifiableSet.<init>(Collections.java:1128)
at java.util.Collections.unmodifiableSet(Collections.java:1118)
at org.jivesoftware.smack.ConnectionConfiguration.getEnabledSaslMechanisms(ConnectionConfiguration.java:476)
at org.jivesoftware.smack.SASLAuthentication.selectMechanism(SASLAuthentication.java:359)
at org.jivesoftware.smack.SASLAuthentication.authenticate(SASLAuthentication.java:191)
at org.jivesoftware.smack.tcp.XMPPTCPConnection.loginInternal(XMPPTCPConnection.java:385)
at org.jivesoftware.smack.AbstractXMPPConnection.login(AbstractXMPPConnection.java:491)
at org.jivesoftware.smack.AbstractXMPPConnection.login(AbstractXMPPConnection.java:448)
at Main.main(Main.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

Answer 1

案件结案。起初，我只使用 smack core 和 smack tcp 作为库。事实证明，在我的案例中，您需要使用 smack sasl 作为库。下载 smack here 并将 smack sasl jar 作为库复制到 libs 文件夹中。

登录时 Smack 4.2.0 NullPointerException

Smack 4.2.0 NullPointerException when logging in

java

nullpointerexception

xmpp

smack

sasl