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在Google App Engine测试服务器上发出http请求时发生SSLHandshakeException（Java）

分类: 技术问答 • 2022-03-31 15:18:21
问题描述：

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。需要注意的是，我要连接的服务器不使用ssl。所以目标网址只包含“http：//”。在Google App Engine测试服务器上发出http请求时发生SSLHandshakeException（Java）

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验证。

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(); 
    }

因此，我在Java应用程序中运行了这段代码，它像一个魅力一样工作。看到它的工作后，我决定尝试将相同的代码放入我在Google App Engine项目中创建的测试servlet中。然而，在允许其执行，我得到这个错误：

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)

我也注意到，在启动服务器，下面的警告被输出：

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，如果这些警告意味着什么，但我认为他们可能。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“确保您下载证书”之外没有发现任何内容。但是我连接的服务器甚至不使用SSL，那么为什么它会抱怨SSL握手呢？

答

好的，我不确定发生了什么，但我认为我的设置被搞乱了。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此问题。所以我希望我能帮助有同样问题的人！

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