java - 在 Google App Engine 测试服务器 (Java) 上发出 http 请求时出现 SSLHandshakeException

Question

我正在尝试使用 Google App Engine 制作应用程序。部分功能要求我通过 http 从第三方服务器提取日历数据。请务必注意，我连接的服务器不使用 ssl。所以目标 url 只包含“http://”。

无论如何，我在普通 Java 应用程序中编写了一些代码作为概念证明。

    try {

        // Create url
        URL targetUrl = new URL(target);

        // Open the connection
        URLConnection connection = targetUrl.openConnection();

        // Create InputStream
        InputStream inStream = connection.getInputStream();

        // Parse calendar data using iCal4j
        CalendarBuilder builder = new CalendarBuilder();
        theCalendar = builder.build(inStream);

        // Close the connection
        inStream.close();

    } catch(IOException e) {
        e.printStackTrace();
    } catch (ParserException e) {
        e.printStackTrace();
    }

所以我在 Java 应用程序中运行了这段代码，它运行得非常棒。看到它工作后，我决定尝试将相同的代码实现到我在 Google App Engine 项目中创建的测试 servlet 中。但是，在允许它执行后，我收到此错误:

javax.net.ssl.SSLHandshakeException: Could not verify SSL certificate for URL: http://the_url
at com.google.appengine.api.urlfetch.URLFetchServiceImpl.convertApplicationException(URLFetchServiceImpl.java:175)
at com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:45)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.fetchResponse(URLFetchServiceStreamHandler.java:543)
at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getInputStream(URLFetchServiceStreamHandler.java:422)
at java.net.URL.openStream(URL.java:1037)
at com.amftech.website.CalendarServlet.doGet(CalendarServlet.java:36)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:134)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:95)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:508)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

我还注意到在启动服务器时，输出了以下警告:

Jun 12, 2017 2:43:14 PM com.google.appengine.repackaged.com.google.protobuf.UnsafeUtil supportsUnsafeByteBufferOperations
WARNING: platform method missing - proto runtime falling back to safer methods: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "accessClassInPackage.sun.misc")
Jun 12, 2017 2:43:14 PM com.google.appengine.repackaged.com.google.protobuf.UnsafeUtil supportsUnsafeArrayOperations
WARNING: platform method missing - proto runtime falling back to safer methods: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "accessClassInPackage.sun.misc")
Jun 12, 2017 2:43:14 PM com.google.appengine.repackaged.com.google.protobuf.UnsafeUtil supportsUnsafeCopyMemory
WARNING: copyMemory is missing from platform - proto runtime falling back to safer methods.

我不知道这些警告是否意味着什么，但我认为它们可能意味着什么。我的测试服务器设置有问题吗？我的项目设置？我搜索了整个互联网，除了“确保下载证书”之外没有找到任何东西。但是我要连接的服务器甚至不使用 SSL，那么为什么它会提示 SSL 握手？

Answer 1

好的，所以我不确定发生了什么，但我认为我的设置不知何故搞砸了。我能够通过删除 Eclipse、卸载 Google Cloud SDK、卸载 java、在 Eclipse 中重置我的工作区以及重新安装和重新配置所有内容来解决这个问题。所以我希望我能帮助有同样问题的人!