High CPU due to Richfaces HashMap.get() infinite loop

Issue

• An application running on a 3 node cluster after running normally for some time, suddenly one node CPU spikes to 80% and stays like that.
• The threads using CPU have stack traces like the following:

"http-0.0.0.0-8080-1" daemon prio=10 tid=0x00002aaaaf78a000 nid=0x27ff runnable [0x0000000049fae000]
   java.lang.Thread.State: RUNNABLE
     at java.util.HashMap.get(HashMap.java:303)
     at org.ajax4jsf.component.UIDataAdaptor.restoreChildState(UIDataAdaptor.java:965)
     at org.ajax4jsf.component.UIDataAdaptor.restoreChildState(UIDataAdaptor.java:984)
     at org.ajax4jsf.component.UIDataAdaptor.restoreChildState(UIDataAdaptor.java:943)
     at org.ajax4jsf.component.UIDataAdaptor.setRowKey(UIDataAdaptor.java:361)
     at org.ajax4jsf.component.UIDataAdaptor.iterate(UIDataAdaptor.java:1029)
     at org.ajax4jsf.component.UIDataAdaptor.encodeAjaxChild(UIDataAdaptor.java:496)
...