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IllegalAccessException with grails timeZoneSelect tag on google app engine/java

Answer 1

+1 A:

This is specific to dynamic languages which use reflection to invoke methods on the sun.* objects returned by java.util.TimeZone factory methods; I worked around a similar limitation in the TimeZone stuff by writing a wrapper method in Java and then calling that method, so that the invocations on the sun.* objects wouldn't be via reflection.

David P. Caldwell 2010-01-18 00:41:55

Can you provide an example of this technique?

aldrin 2010-01-18 03:04:00

Answer 2

A:

Here's the Java half of what I did:

package inonit.google.appengine.runtime;

import java.util.*;

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

My application isn't Grails, and I don't know enough about Grails to know whether the abstractions defined by Grails would make it easy to call into a class like this one or not. But in my app I just went on to instantiate a local helper copy of this object and call into it when I needed to calculate timezone offsets.

David P. Caldwell 2010-01-18 18:16:58

Answer 3

+1 A:

I had a similar problem when I tried to call TimeZone.getTimeZone() to get a TimeZone and worked around this one by using a different library, Joda Time.

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

There are equivalent time/date methods in this package that work better than those in the underlying JDK.

Feargal 2010-01-21 14:25:02

Answer 4

A:

Hi, the below works for me

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;
}

Jonathan 2010-09-05 12:59:50

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IllegalAccessException with grails timeZoneSelect tag on google app engine/java

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