Re: Classcastexception _EOCheapMutableArray

Sat, 08 Dec 2007 12:11:12 -0800 

Hello;

I turned debugging on and got the stack trace.

 dwtm
Error: java.lang.ClassCastException: com.webobjects.eocontrol._EOCheapCopyMutableArray 
Reason:         com.webobjects.eocontrol._EOCheapCopyMutableArray
Stack trace:    
File    Line#   Method  Package
WOToManyRelationship.java 345 updateSourceObject com.webobjects.woextensions WOToManyRelationship.java 421 setSelections com.webobjects.woextensions 
NativeMethodAccessorImpl.java   NA      invoke0         sun.reflect
NativeMethodAccessorImpl.java   39      invoke  sun.reflect
DelegatingMethodAccessorImpl.java       25      invoke  sun.reflect
Method.java     585     invoke  java.lang.reflect
NSKeyValueCoding.java   688     setMethodValue  com.webobjects.foundation
NSKeyValueCoding.java   1175    setValueInObject        
com.webobjects.foundation
NSKeyValueCoding.java   1293    takeValueForKey         
com.webobjects.foundation
WOComponent.java        1550    takeValueForKey         com.webobjects.appserver
NSKeyValueCoding.java   519     takeValueForKey         
com.webobjects.foundation
NSValidation.java 733 validateTakeValueForKeyPath com.webobjects.foundation WOComponent.java 1273 validateTakeValueForKeyPath com.webobjects.appserver WOKeyValueAssociation.java 71 setValue com.webobjects.appserver._private WOBrowser.java 153 _fastTakeValuesFromRequest com.webobjects.appserver._private WOBrowser.java 168 takeValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 81 takeChildrenValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 89 takeValuesFromRequest com.webobjects.appserver._private WOConditional.java 41 takeValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 81 takeChildrenValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 89 takeValuesFromRequest com.webobjects.appserver._private 
WOComponent.java        914     takeValuesFromRequest   com.webobjects.appserver
WOComponentReference.java 97 takeValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 81 takeChildrenValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 89 takeValuesFromRequest com.webobjects.appserver._private WOComponentContent.java 20 takeValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 81 takeChildrenValuesFromRequest com.webobjects.appserver._private WOGenericContainer.java 17 takeValuesFromRequest com.webobjects.appserver._private 
WOComponent.java        914     takeValuesFromRequest   com.webobjects.appserver
WOComponentReference.java 97 takeValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 81 takeChildrenValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 89 takeValuesFromRequest com.webobjects.appserver._private WOComponentContent.java 20 takeValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 81 takeChildrenValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 89 takeValuesFromRequest com.webobjects.appserver._private WOConditional.java 41 takeValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 81 takeChildrenValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 89 takeValuesFromRequest com.webobjects.appserver._private 
WOComponent.java        914     takeValuesFromRequest   com.webobjects.appserver
AbstractSubComponent.java 89 takeValuesFromRequest com.psgs.dodig.dwtm WOComponentReference.java 97 takeValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 81 takeChildrenValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 89 takeValuesFromRequest com.webobjects.appserver._private WOForm.java 70 takeValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 81 takeChildrenValuesFromRequest com.webobjects.appserver._private WODynamicGroup.java 89 takeValuesFromRequest com.webobjects.appserver._private 
WOComponent.java        914     takeValuesFromRequest   com.webobjects.appserver
WOSession.java  1139    takeValuesFromRequest   com.webobjects.appserver
WOApplication.java 1350 takeValuesFromRequest com.webobjects.appserver WOComponentRequestHandler.java 189 _dispatchWithPreparedPage com.webobjects.appserver._private WOComponentRequestHandler.java 287 _dispatchWithPreparedSession com.webobjects.appserver._private WOComponentRequestHandler.java 322 _dispatchWithPreparedApplication com.webobjects.appserver._private WOComponentRequestHandler.java 358 _handleRequest com.webobjects.appserver._private WOComponentRequestHandler.java 435 handleRequest com.webobjects.appserver._private 
WOApplication.java      1306    dispatchRequest         com.webobjects.appserver
SPApplication.java      210     dispatchRequest         com.webobjects.security
Application.java        124     dispatchRequest         com.psgs.dodig.dwtm
WOWorkerThread.java     173     runOnce         
com.webobjects.appserver._private
WOWorkerThread.java     254     run     com.webobjects.appserver._private
Thread.java     613     run     java.lang

Thanks

Don
On Dec 8, 2007, at 1:40 PM, Don Lindsay wrote:


Hello Chuck;

All I get is :

Application:     dwtm
Error: java.lang.ClassCastException: com.webobjects.eocontrol._EOCheapCopyMutableArray 
Reason:         
Stack trace:    
File    Line#   Method  Package
NA : Non applicable, JIT activated

No stack trace at all.  I don't know why.

Don
On Dec 8, 2007, at 12:51 PM, Chuck Hill wrote:



On Dec 8, 2007, at 8:26 AM, Don Lindsay wrote:


Hello;
I recently picked up an old application from about a year ago. When I click save on any of my edit pages I get a classcastexception in WOComponentRequestHandler while handing java.lang.ClassCastException: com.webobjects.eocontrol._EOCheapCopyMutableArray. 

The code that is executed is very basic when save is clicked:

try{
WXDebug.println(20,"AbstractPage.java:saveChanges(): getting editing context"); 
        ec = session().defaultEditingContext();
WXDebug.println(20,"AbstractPage.java:saveChanges(): Saving changes to the editing context"); 
        ec.saveChanges();
} catch( Exception e) {
WXDebug.println(10, "An Error Occurred in AbstractPage.java:saveChanges() error:"+e.getMessage()); errorMessage = "An Error Occurred While Saving, changes may not have saved!: " + e.getMessage(); 
        e.printStackTrace();


Do we get to see the stack trace?  This is a guessing game?



} finally {
WXDebug.println(25,"AbstractPage.java:saveChanges(): return page to user"); 
        WXDebug.println(25,"**AbstractPage.java:saveChanges(): Done");
        return this;
}

Has anyone else seen this?
OK, I will guess. When you write _EOCheapMutableArray you probably mean _EOCheapCopyMutableArray. Copying and pasting exception messages and stack traces is soooo much more useful than transcribing and misspelling them. Just a hint.
_EOCheapCopyMutableArray is used by EOF to implement to-many relationships. If you are getting a class cast: 

1. You have a bug in your code (if only we had the stack trace...)
2. There is a bug in that to many component you are using (stack trace...) 3. You are violating the EOF Commandments and EOF is in a confused state http://wiki.objectstyle.org/confluence/display/WO/EOF-Using+EOF-The +EOF+Commandments 

Chuck


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