我正在尝试将Java AppEngine从Cloud Endpoints迁移到Cloud Endpoints Framework . 即v1到v2 .
迁移很顺利, endpoints 都可以在新实例上访问 . 并且发现显示了所有方法https://myapp.appspot.com/_ah/api/discovery/v1/apis
但是当我使用https://apis-explorer.appspot.com/apis-explorer作为我的appengine域时,虽然我仍然可以看到API方法,但当我深入研究它们时,我不能再提供params并执行它们 .
查看AppEngine日志,我看到以下ClassCastException
Uncaught exception from servlet
javax.servlet.UnavailableException: java.lang.ClassCastException: com.google.api.server.spi.config.AnnotationBoolean cannot be cast to com.google.api.server.spi.config.AnnotationBoolean
at org.mortbay.jetty.servlet.ServletHolder.makeUnavailable(ServletHolder.java:415)
at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:458)
at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.googlecode.objectify.cache.AsyncCacheFilter.doFilter(AsyncCacheFilter.java:58)
at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:37)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48)
at org.mortbay.jetty.servlet.ServletHandler$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.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:257)
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$RequestHandler.headerComplete(HttpConnection.java:923)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:145)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchServletRequest(JavaRuntime.java:559)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchRequest(JavaRuntime.java:519)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:489)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:453)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:460)
at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:293)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:319)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:311)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:457)
at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:238)
at java.lang.Thread.run(Thread.java:745)
这似乎与尝试在API Explorer中深入研究方法相匹配 . Cloud endpoints v1不会发生这些错误 .
ClassCast意味着AnnotationBoolen已加载到2个不同的类加载器中 . 我自己不是在玩类加载器,所以我认为这是Endpoints v2的新功能 . 我应该做些什么来避免ClassCast?
API Explorer是否不完全支持Cloud Endpoints Framework?
我需要采取一些额外步骤来通过API Explorer for Cloud Endpoints Framework启用方法执行吗?
2 回答
根据Cloud EndPoints框架迁移指南,不再支持这些maven目标 .
见https://cloud.google.com/appengine/docs/standard/java/endpoints/migrating
它 also 看起来像你需要
向您的应用添加Cloud Endpoints API管理 . 见https://cloud.google.com/endpoints/docs/frameworks/java/adding-api-management
生成API配置文件并在部署应用程序之前部署它 . 见https://cloud.google.com/endpoints/docs/frameworks/java/test-deploy
使用...生成客户端库
见https://cloud.google.com/endpoints/docs/frameworks/java/quickstart-frameworks-java
第1步意味着在web.xml中添加以下内容:
您遇到的
ClassCastException
是由于加载旧的SystemServiceServlet
而不是新的EndpointsServlet
. 配置web.xml
进行替换同