使用Smack 4.1的XMPP客户端在登录期间给出NullPointerException [英] XMPP client using Smack 4.1 giving NullPointerException during login

问题描述

我正在尝试使用Smack 4.1.0-rc3来实现连接到ejabberd xmpp服务器的java xmpp客户端。我使用以下代码连接到服务器。

  XMPPTCPConnectionConfiguration connConfig = XMPPTCPConnectionConfiguration 
 .builder（）
 .setServiceName（example.com）
 .setHost（192.168.56.101）
 .setPort（5222）
 .setCompressionEnabled（false）
 .setSecurityMode（SecurityMode） .disabled）
 .setHostnameVerifier（new HostnameVerifier（）{
 public boolean verify（String arg0，SSLSession arg1）{
 return true; 
} 
}）
 .setUsernameAndPassword（user，pass）.build（）; 
 
 connection = new XMPPTCPConnection（connConfig）; 
 connection.connect（）; 
 connection.login（）; 
  

执行'connection.login（）'时，我收到以下NullPointerException。

  org.jivesoftware.smack.util.stringencoder中线程main的异常java.lang.NullPointerException 
。 Base64.encode（Base64.java:64）
 at org.jivesoftware.smack.util.stringencoder.Base64.encode（Base64.java:60）
 at org.jivesoftware.smack.util.stringencoder。 Base64.encodeToString（Base64.java:42）
 at org.jivesoftware.smack.sasl.SASLMechanism.authenticate（SASLMechanism.java:199）
 at org.jivesoftware.smack.sasl.SASLMechanism.authenticate（ SASLMechanism.java:169）
 at org.jivesoftware.smack.SASLAuthentication.authenticate（SASLAuthentication.java:236）
 at org.jivesoftware.smack.tcp.XMPPTCPConnection.loginNonAnonymously(XMPPTCPConnection.java:365） 
 at org.jivesoftware.smack.AbstractXMPPConnection.login（AbstractXMPPConnection.java:452）
 at org.jivesoftware.smack.AbstractXMPPConnection.login（AbstractXMPPConnection.java:410）
 at org.org .oodlezz.unio.jabber.client.XmppClient.connect（XmppClient.java:88）
 org.org.oodlezz.unio.ja bber.client.Client.main（Client.java:32）
  

我做错了什么码？你能否指点一下使用Smack 4.1.0-rc3的正确例子？

解决方案

此页面上的其他答案有部分答案，但尝试他们我弄清楚真正缺少的是对smack-java7库的依赖。添加此依赖项会导致调用初始化程序，设置base64encoder，因此NullPointerException消失。

在Android上，用smack-android替换smack-java7。 / p>

I am trying to use Smack 4.1.0-rc3 for implementing a java xmpp client which connects to a ejabberd xmpp server. I am using the following code for connecting to the server.

    XMPPTCPConnectionConfiguration connConfig =    XMPPTCPConnectionConfiguration
            .builder()
            .setServiceName("example.com")
            .setHost("192.168.56.101")
            .setPort(5222)
            .setCompressionEnabled(false)
            .setSecurityMode(SecurityMode.disabled)
            .setHostnameVerifier(new HostnameVerifier() {
                public boolean verify(String arg0, SSLSession arg1) {
                    return true;
                }
            })
            .setUsernameAndPassword(user, pass).build();

    connection = new XMPPTCPConnection(connConfig);
    connection.connect();
    connection.login();

While executing the 'connection.login()' i am getting the following NullPointerException.

Exception in thread "main" java.lang.NullPointerException
at org.jivesoftware.smack.util.stringencoder.Base64.encode(Base64.java:64)
at org.jivesoftware.smack.util.stringencoder.Base64.encode(Base64.java:60)
at org.jivesoftware.smack.util.stringencoder.Base64.encodeToString(Base64.java:42)
at org.jivesoftware.smack.sasl.SASLMechanism.authenticate(SASLMechanism.java:199)
at org.jivesoftware.smack.sasl.SASLMechanism.authenticate(SASLMechanism.java:169)
at org.jivesoftware.smack.SASLAuthentication.authenticate(SASLAuthentication.java:236)
at org.jivesoftware.smack.tcp.XMPPTCPConnection.loginNonAnonymously(XMPPTCPConnection.java:365)
at org.jivesoftware.smack.AbstractXMPPConnection.login(AbstractXMPPConnection.java:452)
at org.jivesoftware.smack.AbstractXMPPConnection.login(AbstractXMPPConnection.java:410)
at org.org.oodlezz.unio.jabber.client.XmppClient.connect(XmppClient.java:88)
at org.org.oodlezz.unio.jabber.client.Client.main(Client.java:32)

Am I doing something wrong in the code? Can you please point me towards a proper example for using Smack 4.1.0-rc3?

解决方案

The other answers on this page have parts of the answer, but trying them I figured out what is really missing is the dependency on smack-java7 library. Adding this dependency causes the initializers to be called, the base64encoder to be set, and so this NullPointerException disappears.

On Android, replace smack-java7 with smack-android.

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