信任锚认证路径没有找到。
解决方法:增加setSecurityMode()方法。
XMPPTCPConnectionConfiguration.Builder configBuilder = XMPPTCPConnectionConfiguration.builder();
configBuilder.setHost("192.168.1.222");
configBuilder.setPort(5222);
configBuilder.setServiceName("192.168.1.222");
configBuilder.setSecurityMode(ConnectionConfiguration.SecurityMode.disabled);
final AbstractXMPPConnection connection =
new XMPPTCPConnection(configBuilder.build());