GWT Blobstore 调用 createUploadUrl() 时出错 [英] GWT Blobstore error calling createUploadUrl()

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本文介绍了GWT Blobstore 调用 createUploadUrl() 时出错的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我尝试使用 GWT 将 Blobstore api 用于 appengine...我答应你！我让它工作了几个月，突然间我开始了得到以下错误.. 执行以下行后一个小服务器.

I am attempt to use the Blobstore api for appengine using GWT... I promise you! I had it working for months and suddenly I started get the following errors.. arfter executing the following line from a servelet.

公共类 ImageServiceImpl 扩展 RemoteServiceServlet 实现 ImageService {

public class ImageServiceImpl extends RemoteServiceServlet implements ImageService {

    /**
 * 
 */
private static final long serialVersionUID = 1L;

  // init the blog store service
private BlobstoreService blobService = BlobstoreServiceFactory.getBlobstoreService();
    //private static final Logger log = Logger.getLogger(ImageServiceImpl.class);
    public static final String PATH_TO_DEFAULT_IMAGE = "images/no_photo.jpg";

.....//为简洁起见省略}

. . . . . // omitted for brevity }

    @Override
    public String getUpLoadPath() {
        String url = blobService.createUploadUrl("/n5/doimage");
        return url;
    }

}

初始化 App Engine 服务器2011 年 9 月 19 日晚上 7:28:45 com.google.apphosting.utils.jetty.JettyLogger 信息信息:通过 com.google.apphosting.utils.jetty.JettyLogger 登录到 JettyLogger(null)2011 年 9 月 19 日下午 7:28:45 com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml信息:已成功处理 C:development 5 5warWEB-INF/appengine-web.xml2011 年 9 月 19 日晚上 7:28:45 com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml信息:成功处理 C:development 5 5warWEB-INF/web.xml2011 年 9 月 19 日下午 3:28:47 com.google.appengine.tools.development.DevAppServerImpl 开始信息:服务器运行在 http://localhost:8888/2011 年 9 月 19 日下午 7:34:59 com.google.appengine.tools.development.ApiProxyLocalImpl 日志严重:javax.servlet.ServletContext 日志:调度传入的 RPC 调用时出现异常com.google.gwt.user.server.rpc.UnexpectedException:服务方法public abstract java.lang.String com.six.n5.client.service.ImageService.getUpLoadPath()"引发了意外异常:java.lang.VerifyError:类 com.google.appengine.api.blobstore.BlobstoreServicePb$CreateUploadURLRequest 覆盖最终方法 isInitialized.()Z在 com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:385)在 com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:588)在 com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)在 com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)在 com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)在 javax.servlet.http.HttpServlet.service(HttpServlet.java:637)在 javax.servlet.http.HttpServlet.service(HttpServlet.java:717)在 com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:216)在 com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:141)在 com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:93)在 com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:63)在 com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:122)在 com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:110)在 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)在 com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35)在 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)在 com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58)在 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)在 com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)在 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)在 com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)在 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)在 com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97)在 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)在 org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)在 org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)在 org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)在 org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)在 org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)在 com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)在 org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)在 com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:351)在 org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)在 org.mortbay.jetty.Server.handle(Server.java:326)在 org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)在 org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)在 org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)在 org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)在 org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)在 org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)在 org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)引起:java.lang.VerifyError: class com.google.appengine.api.blobstore.BlobstoreServicePb$CreateUploadURLRequest 覆盖最终方法 isInitialized.()Z在 java.lang.ClassLoader.defineClass1(Native Method)在 java.lang.ClassLoader.defineClass(Unknown Source)在 java.security.SecureClassLoader.defineClass(Unknown Source)在 java.net.URLClassLoader.defineClass(Unknown Source)在 java.net.URLClassLoader.access$100(来源不明)在 java.net.URLClassLoader$1.run(Unknown Source)在 java.net.URLClassLoader$1.run(Unknown Source)在 java.security.AccessController.doPrivileged(Native Method)在 java.net.URLClassLoader.findClass(Unknown Source)在 java.lang.ClassLoader.loadClass(来源不明)在 com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:176)在 java.lang.ClassLoader.loadClass(来源不明)在 com.google.appengine.api.blobstore.BlobstoreServiceImpl.createUploadUrl(BlobstoreServiceImpl.java:43)在 com.google.appengine.api.blobstore.BlobstoreServiceImpl.createUploadUrl(BlobstoreServiceImpl.java:34)在 com.six.n5.server.ImageServiceImpl.getUpLoadPath(ImageServiceImpl.java:153)在 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)在 sun.reflect.NativeMethodAccessorImpl.invoke(来源不明)在 sun.reflect.DelegatingMethodAccessorImpl.invoke(来源不明)在 java.lang.reflect.Method.invoke(Unknown Source)在 com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:100)在 com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)... 39个

Initializing App Engine server Sep 19, 2011 7:28:45 PM com.google.apphosting.utils.jetty.JettyLogger info INFO: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger Sep 19, 2011 7:28:45 PM com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml INFO: Successfully processed C:development 5 5warWEB-INF/appengine-web.xml Sep 19, 2011 7:28:45 PM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml INFO: Successfully processed C:development 5 5warWEB-INF/web.xml Sep 19, 2011 3:28:47 PM com.google.appengine.tools.development.DevAppServerImpl start INFO: The server is running at http://localhost:8888/ Sep 19, 2011 7:34:59 PM com.google.appengine.tools.development.ApiProxyLocalImpl log SEVERE: javax.servlet.ServletContext log: Exception while dispatching incoming RPC call com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract java.lang.String com.six.n5.client.service.ImageService.getUpLoadPath()' threw an unexpected exception: java.lang.VerifyError: class com.google.appengine.api.blobstore.BlobstoreServicePb$CreateUploadURLRequest overrides final method isInitialized.()Z at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:385) at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:588) at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208) at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248) at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:216) at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:141) at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:93) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:63) at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:122) at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:110) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58) at org.mortbay.jetty.servlet.ServletHandler$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.BackendServersFilter.doFilter(BackendServersFilter.java:97) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:351) 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$RequestHandler.content(HttpConnection.java:938) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) Caused by: java.lang.VerifyError: class com.google.appengine.api.blobstore.BlobstoreServicePb$CreateUploadURLRequest overrides final method isInitialized.()Z at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.access$100(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:176) at java.lang.ClassLoader.loadClass(Unknown Source) at com.google.appengine.api.blobstore.BlobstoreServiceImpl.createUploadUrl(BlobstoreServiceImpl.java:43) at com.google.appengine.api.blobstore.BlobstoreServiceImpl.createUploadUrl(BlobstoreServiceImpl.java:34) at com.six.n5.server.ImageServiceImpl.getUpLoadPath(ImageServiceImpl.java:153) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:100) at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569) ... 39 more

推荐答案

我发现了自己的错误！事实证明，这突然失败的原因是因为 FORM 帖子认为这是跨域发布.我正在通过调用 127.0.0.1:8888..etc 来测试网站，但是当我的 Image RPC 被调用以建立上传路径时，它返回到表单 setAction 中，而不是我的机器名称 kmoore-PC:8888..etc127.0.0.1:8888... 因此它返回 null 因为它认为它跨域.

I found my own error! as it turn out the reason this was suddenly failing was because the FORM post thought it was cross domain posting. I was testing the web site by calling 127.0.0.1:8888..etc but when the when my Image RPC was called to establish the upload path, it returned to the form setAction the my machine name kmoore-PC:8888..etc instead of the 127.0.0.1:8888... and hence it returned null because it thought it was crossing domains.

要修复，请单击 url 栏中的 google 框并添加您的计算机名称，然后使用计算机名称而不是 127 来测试您的应用

To fix, click on the google box in url bar and add your computer name and then test you app using the computer name instead of 127

这篇关于GWT Blobstore 调用 createUploadUrl() 时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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