Objectify를 사용하는 GWT의 NullPointerException

Question

내 GWT (Java) 응용 프로그램에 Objectify를 사용하고 있습니다.

오류가 발생합니다 (아래 스택 추적).

이 예외의 원인을 제안 할 수 있습니까? 내가 객관화 (V 4 - objectify-4.0b1.jar).

java.lang.NullPointerException 
at com.googlecode.objectify.impl.CacheControlImpl.getExpirySeconds(CacheControlImpl.java:25) 
at com.googlecode.objectify.cache.EntityMemcache.getAll(EntityMemcache.java:207) 
at com.googlecode.objectify.cache.CachingAsyncDatastoreService.get(CachingAsyncDatastoreService.java:253) 
at com.googlecode.objectify.impl.engine.LoadEngine$Round.fetchPending(LoadEngine.java:172) 
at com.googlecode.objectify.impl.engine.LoadEngine$Round.execute(LoadEngine.java:118) 
at com.googlecode.objectify.impl.engine.LoadEngine.execute(LoadEngine.java:258) 
at com.googlecode.objectify.impl.translate.LoadContext.done(LoadContext.java:53) 
at com.googlecode.objectify.impl.engine.LoadEngine$Round$2.postExecuteHook(LoadEngine.java:147) 
at com.googlecode.objectify.util.ResultCache.now(ResultCache.java:33) 
at com.googlecode.objectify.impl.engine.LoadEngine$Round$1.nowUncached(LoadEngine.java:75) 
at com.googlecode.objectify.util.ResultCache.now(ResultCache.java:30) 
at com.googlecode.objectify.impl.ref.StdRef.get(StdRef.java:57) 
at com.googlecode.objectify.impl.cmd.QueryImpl$3.translate(QueryImpl.java:382) 
at com.googlecode.objectify.impl.cmd.QueryImpl$3.translate(QueryImpl.java:379) 
at com.googlecode.objectify.util.TranslatingQueryResultIterable$1.translate(TranslatingQueryResultIterable.java:31) 
at com.googlecode.objectify.util.TranslatingIterator.next(TranslatingIterator.java:35) 
at com.l3.rnlgpc.server.DAO.CaseDAO.getCases(CaseDAO.java:189) 
at com.l3.rnlgpc.server.manager.CaseManager.getCases(CaseManager.java:52) 
at com.l3.rnlgpc.server.manager.ExportManager.export(ExportManager.java:49) 
at com.l3.rnlgpc.server.servlet.export.ExportCaseToCSV.doGet(ExportCaseToCSV.java:49) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) 
at com.googlecode.objectify.cache.AsyncCacheFilter.doFilter(AsyncCacheFilter.java:59) 
at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:49) 
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:35) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:57) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) 
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) 
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) 
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) 
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) 
at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:266) 
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
at org.mortbay.jetty.Server.handle(Server.java:326) 
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) 
at org.mortbay.jetty.HttpConnection$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:146) 
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:439) 
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:483) 
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:490) 
at com.google.tracing.TraceContext.runInContext(TraceContext.java:777) 
at com.google.tracing.TraceContext$DoInTraceContext.runInContext(TraceContext.java:754) 
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:345) 
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:337) 
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:487) 
at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251) 
at java.lang.Thread.run(Thread.java:722) 

Answer 1

을 사용하고

이이 link에 본사를 둔 objectfy에 버그가있다.

이것은 버그입니다. 곧 수정 될 예정입니다. 미안합니다. 제프

여기 객관화 4를 사용

설명대로 모델을 등록 할 필요가 있음을 해결하기 , 나는이 코드 줄 쓴

:

MyModel 모델 = ofy.load을 () .type (MyModel.class) .id (42) .get();

는 단순히

ObjectifyService.register (MyModel.class)와 레지스터 MyModel 깜빡; Objectify 3에서 "Class MyModel에 이 등록되지 않았습니다."또는 이와 비슷한 예외가 발생하지만 Objectify 4는 NullPointerException을 발생시킵니다.