Google App Engine / Java上帶有grails timeZoneSelect標記的IllegalAccessException

Question

有人在GAE / J上使用過grails timeZoneSelect標簽嗎？ 我在應用引擎上遇到以下錯誤。 我知道不允許反射，但是錯誤行似乎正在調用簡單的公共函數（inDaylightTime）？ 有誰知道如何解決此問題（缺少硬編碼的時區列表）？

謝謝

Uncaught exception from servlet
org.codehaus.groovy.grails.web.pages.exceptions.GroovyPagesException: Error processing GroovyPageView: Error executing tag : org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Error executing tag : java.lang.IllegalAccessException: Reflection is not allowed on public boolean sun.util.calendar.ZoneInfo.inDaylightTime(java.util.Date)
    at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:97)
    at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:238)
    at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135)
    at com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:235)
    at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5235)
    at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5233)
    at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:24)
    at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:363)
    at com.google.net.rpc.impl.Server$2.run(Server.java:838)
    at com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56)
    at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:536)
    at com.google.net.rpc.impl.Server.startRpc(Server.java:793)
    at com.google.net.rpc.impl.Server.processRequest(Server.java:368)
    at com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:448)
    at com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java:319)
    at com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java:290)
    at com.google.net.async.Connection.handleReadEvent(Connection.java:466)
    at com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:759)
    at com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java:205)
    at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:101)
    at com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java:251)
    at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run(JavaRuntime.java:394)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Error executing tag : org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Error executing tag : java.lang.IllegalAccessException: Reflection is not allowed on public boolean sun.util.calendar.ZoneInfo.inDaylightTime(java.util.Date)

Answer 1

這是特定於動態語言的，這些動態語言使用反射在sun。*對象上調用方法。java.util.TimeZone工廠方法返回的對象； 通過在Java中編寫包裝方法，然后調用該方法，我解決了TimeZone方面的類似限制，以便對sun。*對象的調用不會通過反射進行。

Answer 2

當我嘗試調用TimeZone.getTimeZone（）來獲取TimeZone並通過使用另一個庫Joda Time解決該問題時，我遇到了類似的問題。

http://joda-time.sourceforge.net/index.html

此程序包中的等效時間/日期方法比基礎JDK中的方法更有效。

Answer 3

下面對我有用

public Date getDateWithTimeZone(Date date, String timeZone){
    def tz = TimeZone.getTimeZone(timeZone);
    def cal = Calendar.getInstance()
    cal.setTimeInMillis( date.getTime() )
    cal.setTimeZone( tz )
    def offset = cal.get(Calendar.ZONE_OFFSET)
    date.setTime( date.getTime()+offset )
    return date;
}

Answer 4

這是我所做的Java的一半：

package inonit.google.appengine.runtime;

import java.util.*;

public class Methods {
    public int getTimezoneOffset(String timezone, long time) {
        return TimeZone.getTimeZone(timezone).getOffset(time);
    }
}

我的應用程序不是Grails，而且我對Grails的了解還不足以了解Grails定義的抽象是否可以使調用此類的類變得容易。 但是在我的應用程序中，我只是繼續實例化此對象的本地幫助程序副本，並在需要計算時區偏移量時調用它。