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Serializing a non-EO in JSON
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Serializing a non-EO in JSON

  • Subject: Serializing a non-EO in JSON
  • From: Pascal Robert <email@hidden>
  • Date: Thu, 05 May 2011 09:56:58 -0400
I'm a bit lost here. I'm trying to encode a ERCalendar object in JSON, and I'm getting problems. That object (coming from ERCalendar2) also have a array that contains EREvent objects.

So I did that:

        JSONSerializer serializer = new JSONSerializer();
        serializer.registerDefaultSerializers();
        serializer.registerSerializer(new ERXBeanSerializer(EREvent.class));
        serializer.registerSerializer(new ERXBeanSerializer(ERCalendar.class));
        serializer.registerSerializer(new NSArraySerializer());

But I'm getting Java heap space errors (see full stack below).

If I don't serialize EREvent, no errors, but the EREvent objects are not serialized. So I guess something make the serializer to go an infinite loop in EREvent, but I don't know what.

Any suggestions?

Stacktrace:

 INFO [er.ajax.json.serializer.ERXBeanSerializer] analyzing er.calendar2.ERCalendar
 INFO [org.jabsorb.serializer.impl.BeanSerializer] analyzing net.fortuna.ical4j.model.Calendar
...
 INFO [org.jabsorb.serializer.impl.BeanSerializer] analyzing java.net.Proxy$Type
 INFO [org.jabsorb.serializer.impl.BeanSerializer] analyzing java.util.concurrent.TimeUnit$1
 INFO [org.jabsorb.serializer.impl.BeanSerializer] analyzing java.util.concurrent.TimeUnit$2
 INFO [org.jabsorb.serializer.impl.BeanSerializer] analyzing java.util.concurrent.TimeUnit$3
 INFO [org.jabsorb.serializer.impl.BeanSerializer] analyzing java.util.concurrent.TimeUnit$4
 INFO [org.jabsorb.serializer.impl.BeanSerializer] analyzing java.util.concurrent.TimeUnit$5
 INFO [org.jabsorb.serializer.impl.BeanSerializer] analyzing java.util.concurrent.TimeUnit$6
 INFO [org.jabsorb.serializer.impl.BeanSerializer] analyzing java.util.concurrent.TimeUnit$7
 WARN [NSLog] <com.webobjects.appserver._private.WOComponentRequestHandler>: Exception occurred while handling request:
com.webobjects.foundation.NSForwardException [java.lang.reflect.InvocationTargetException] null:java.lang.reflect.InvocationTargetException
[2011-5-5 9:1:43 EDT] <WorkerThread0> com.webobjects.foundation.NSForwardException [java.lang.reflect.InvocationTargetException] null:java.lang.reflect.InvocationTargetException
	at com.webobjects.foundation._NSUtilities._explainInstantiationException(_NSUtilities.java:626)
	at com.webobjects.foundation._NSUtilities.instantiateObject(_NSUtilities.java:646)
	at com.webobjects.appserver._private.WOComponentDefinition._componentInstanceInContext(WOComponentDefinition.java:544)
	at com.webobjects.appserver._private.WOComponentDefinition.componentInstanceInContext(WOComponentDefinition.java:642)
	at com.webobjects.appserver.WOApplication.pageWithName(WOApplication.java:2332)
	at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedSession(WOComponentRequestHandler.java:284)
	at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedApplication(WOComponentRequestHandler.java:332)
	at com.webobjects.appserver._private.WOComponentRequestHandler._handleRequest(WOComponentRequestHandler.java:369)
	at com.webobjects.appserver._private.WOComponentRequestHandler.handleRequest(WOComponentRequestHandler.java:442)
	at com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:1687)
	at er.extensions.appserver.ERXApplication.dispatchRequestImmediately(ERXApplication.java:1984)
	at er.extensions.appserver.ERXApplication.dispatchRequest(ERXApplication.java:1949)
	at com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144)
	at com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:226)
	at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
	at com.webobjects.foundation._NSUtilities.instantiateObject(_NSUtilities.java:640)
	... 13 more
Caused by: java.lang.OutOfMemoryError: Java heap space
	at java.util.LinkedList.toArray(LinkedList.java:863)
	at java.util.ArrayList.<init>(ArrayList.java:131)
	at org.jabsorb.serializer.FixUp.<init>(FixUp.java:57)
	at org.jabsorb.serializer.SerializerState.addFixUp(SerializerState.java:74)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:371)
	at org.jabsorb.serializer.impl.ArraySerializer.marshall(ArraySerializer.java:298)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.ArraySerializer.marshall(ArraySerializer.java:298)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.ArraySerializer.marshall(ArraySerializer.java:298)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.ArraySerializer.marshall(ArraySerializer.java:298)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.ArraySerializer.marshall(ArraySerializer.java:298)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.ArraySerializer.marshall(ArraySerializer.java:298)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)

 WARN [NSLog] Ran out of memory, killing this instance
FATAL [er.extensions.appserver.ERXApplication] Ran out of memory, killing this instance
FATAL [er.extensions.appserver.ERXApplication] Ran out of memory, killing this instance
java.lang.OutOfMemoryError: Java heap space
	at java.util.LinkedList.toArray(LinkedList.java:863)
	at java.util.ArrayList.<init>(ArrayList.java:131)
	at org.jabsorb.serializer.FixUp.<init>(FixUp.java:57)
	at org.jabsorb.serializer.SerializerState.addFixUp(SerializerState.java:74)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:371)
	at org.jabsorb.serializer.impl.ArraySerializer.marshall(ArraySerializer.java:298)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.ArraySerializer.marshall(ArraySerializer.java:298)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.ArraySerializer.marshall(ArraySerializer.java:298)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.ArraySerializer.marshall(ArraySerializer.java:298)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.ArraySerializer.marshall(ArraySerializer.java:298)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.ArraySerializer.marshall(ArraySerializer.java:298)
	at org.jabsorb.JSONSerializer.marshall(JSONSerializer.java:385)
	at org.jabsorb.serializer.impl.BeanSerializer.marshall(BeanSerializer.java:235) _______________________________________________
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