Java Firebase 错误 "NoClassDefFoundError: org/apache/http/conn/ssl/StrictHostnameVerifier"

Question

我有一个非常简单的 servlet 程序，可以在谷歌应用程序引擎上正常运行。现在，当我添加 firebase 对象以进行子值更新调用时，它在 appengine 和本地 apache tomcat 上显示服务器错误 500，它还显示一些错误。这是我的代码

package com.example.appengine.helloworld;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.firebase.client.Firebase;
import com.firebase.client.FirebaseException;

@SuppressWarnings("serial")
public class HelloServlet extends HttpServlet {

  @Override
  public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException,FirebaseException  {


    PrintWriter out = resp.getWriter();
    out.println("Hello, world");
    Firebase fire = new Firebase("https://fiery-fire-0.firebaseio.com/");
    fire.child("hello").setValue("Nothing is in here");   
  }
}

这是在apache tomcat上运行时出现的错误

    Exception in thread "TubeSockReader-1" java.lang.NoClassDefFoundError: org/apache/http/conn/ssl/StrictHostnameVerifier
    at com.firebase.tubesock.WebSocket.verifyHost(WebSocket.java:287)
    at com.firebase.tubesock.WebSocket.createSocket(WebSocket.java:271)
    at com.firebase.tubesock.WebSocket.runReader(WebSocket.java:306)
    at com.firebase.tubesock.WebSocket.access$000(WebSocket.java:30)
    at com.firebase.tubesock.WebSocket$2.run(WebSocket.java:108)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.apache.http.conn.ssl.StrictHostnameVerifier
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1854)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1703)
    ... 6 more

在谷歌应用程序引擎上运行它时，它只是说

Error: Server Error

The server encountered an error and could not complete your request.
Please try again in 30 seconds.

请帮助我!

Answer 1

您的 http 客户端库版本似乎没有(现已弃用)类 StrictHostnameVerifier。

https://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache/http/conn/ssl/StrictHostnameVerifier.html

尝试手动包含 httpclient 4.0.1 而不是“最新”(尽管根据文档它应该出现在 4.5.1 中)。