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From "Vinod Padmanabha Iyer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (JCS-102) JCS.getGroupKeys() always triggers a\ ClassCastException
Date Wed, 11 Nov 2015 11:22:10 GMT

    [ https://issues.apache.org/jira/browse/JCS-102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15000253#comment-15000253
] 

Vinod Padmanabha Iyer commented on JCS-102:
-------------------------------------------

Hi Thomas,
I am not sure if I am supposed to update here. Just let me know if I am not supposed to. I
used the 2.0-beta1 that is the latest i got from the website. Used the below code and I am
getting the same error.

Error:
Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot be cast to
org.apache.commons.jcs.engine.control.group.GroupAttrName
	at org.apache.commons.jcs.access.GroupCacheAccess.getGroupKeys(GroupCacheAccess.java:174)
	at com.informatica.mdmbde.jcs.example.EmployeeManager.<init>(EmployeeManager.java:30)
	at com.informatica.mdmbde.jcs.example.EmployeeManager.main(EmployeeManager.java:62)

Code Snippet:
	private GroupCacheAccess<Object, Object> cache; 
	public EmployeeManager() { 
		try { 
			// Load the cache 
			cache = JCS.getGroupCacheInstance( "empCache" ); 
			// Initialize the cache, Here data can be loaded during initialization 
			cache.putInGroup("123", "group1", new Employee( "Nick", "Detroit.USA", "123" ) ); 
			cache.putInGroup("143", "group1", new Employee( "Ric", "Seattle.USA", "143" ) ); 
			cache.putInGroup("153", "group2", new Employee( "Jhon", "Chicago.USA", "153" ) ); 
			cache.putInGroup("163", "group2", new Employee( "Dan", "Houston.USA", "163" ) ); 
			Iterator iter = cache.getGroupKeys("group1").iterator();
			while (iter.hasNext()) {
				System.out.println("key = " + iter.next());
			}
		} catch( CacheException e ) { 
			e.printStackTrace(); 
		} 
	} 


> JCS.getGroupKeys() always triggers a\ ClassCastException
> --------------------------------------------------------
>
>                 Key: JCS-102
>                 URL: https://issues.apache.org/jira/browse/JCS-102
>             Project: Commons JCS
>          Issue Type: Bug
>          Components: Composite Cache
>    Affects Versions: jcs-2.0-beta-1
>            Reporter: Robert Clark
>            Assignee: Thomas Vandahl
>             Fix For: jcs-2.0-beta-1
>
>
> Using SVN version build Dec 20, 2012:
> This code:
> {code:java}
> JCS<Long, String> jcs = JCS.getInstance("the region");
> jcs.getGroupKeys("the group");
> jcs.putInGroup(Long.valueOf(1), "the group", "some value");
> jcs.getGroupKeys("the group");
> {code}
> will trigger an exception on the *second* getGroupKeys() call (when there is actually
something in the cache)
> {noformat}
> Exception in thread "main" java.lang.ClassCastException: java.lang.Long cannot be cast
to org.apache.jcs.engine.control.group.GroupAttrName
>      [java] 	at org.apache.jcs.access.GroupCacheAccess.getGroupKeys(GroupCacheAccess.java:205)
>      [java] 	at my.sample.code.Main.main(Main.java:108)
> {noformat}



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