code: protected synchronized void clear()
                      throws ObjectManagerException
      {
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.entry(this, cclass
                          , "clear"
                              );
          // All ManagedObjects are new sequence number up to initialSequenceNumber are reserved.
          sequenceNumber = initialSequenceNumber;
          allocationAllowed = true;
  
          inMemoryTokens = new WeakValueConcurrentHashMap(concurrency);
  
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.exit(this, cclass
                         , "clear"
                              );
      }
docs: /*
  (non-Javadoc)
  
  @see com.ibm.ws.objectManager.ObjectStore#clear()