Memcache Java API / expiration time issue

[Ryan Boyce]

We're running memcached 1.1 server, and using Java memcached client 
API.  Suddenly after storing data variables onto server, we'd receive an
exception in retrieving variables back: 
 
#############################################
com.danga.MemCached.MemCachedClient Tue Nov 09 01:04:20 PST 2004 - ++++ 
ClassNot
FoundException thrown while trying to deserialize for key: userObj
com.danga.MemCached.MemCachedClient Tue Nov 09 01:04:20 PST 2004 - ++++ 
exception thrown while trying to get object from cache for key: userObj
com.danga.MemCached.MemCachedClient Tue Nov 09 01:04:20 PST 2004 - +++ 
failed while trying to deserialize for key: userObj
java.io.IOException: +++ failed while trying to deserialize for key:
userObj
        at 
com.danga.MemCached.MemCachedClient.loadItems(MemCachedClient.java:10
84)
        at
com.danga.MemCached.MemCachedClient.get(MemCachedClient.java:850)
        at
com.danga.MemCached.MemCachedClient.get(MemCachedClient.java:816)
        at _test__jsp._jspService(_test__jsp.java:61)
 
com.danga.MemCached.SockIOPool Tue Nov 09 01:04:20 PST 2004 - ++++ 
SockIOPool shutting down...
com.danga.MemCached.SockIOPool Tue Nov 09 01:04:20 PST 2004 - ++++ 
closing all internal pools.
com.danga.MemCached.SockIOPool Tue Nov 09 01:04:20 PST 2004 - ++++ 
SockIOPool finished shutting down.
#########################################
 
While standard Java objects like Integer can still be retrievied 
correctly, the expiration set and replace commands do not work
correctly: 
 a call to memClient.set(key, var, expireTime) would immediately expire
the variable.  I found that out by immediately calling get on that 
variable: 
 
MemCachedClient mc = new MemCachedClient();
 
String numberKey = "numberKey";
Integer num = (Integer)mc.get(numberKey);
if ( num == null )
{
    num = new Integer(49);
    out.println("Cached number "+ num +" is NOT found "+ (new 
java.util.Date()) );
    Calendar later = Calendar.getInstance();
    later.add(Calendar.MINUTE, 5);
    java.util.Date laterTime = later.getTime();
    out.println("Storing number "+ num +" : "+ mc.set(numberKey, num) );
    //out.println("  expiring at "+ laterTime );
 
    num = (Integer)mc.get(numberKey);
    out.println("search number back again: "+ num );
}
else
{
    out.println("Cached number "+ num +" is found "+ (new 
java.util.Date()) );
    Calendar later = Calendar.getInstance();
    later.add(Calendar.HOUR, 1);
    java.util.Date laterTime = later.getTime();
    //out.println("set number "+ num +" : "+ mc.set(numberKey, num, 
laterTime) +" expiring at "+ laterTime );
   
    num = new Integer( num.intValue() + 1 );
    out.println("replace number "+ num +" : "+ mc.replace(numberKey, 
num, laterTime ) +" to new value "+ num.intValue() +" expiring "+ 
laterTime);
 
    num = (Integer)mc.get(numberKey);
    out.println("search number back again: "+ num );
}
 
#### Codes
####################################################
#### Output
 
( 1st call )
Cached number 49 is NOT found Tue Nov 09 01:11:02 PST 2004 Storing
number 49 : true search number back again: 49
 
( 2nd call )
Cached number 49 is found Tue Nov 09 01:10:48 PST 2004
set number 49 : true expiring at Tue Nov 09 01:11:48 PST 2004 search
number back again: null
 
 
 
Thank You,
Ryan Boyce
Visit www.ioffer.com
An easier way to buy and sell
 
 
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