The reference code:
Blip rootBlip = wavelet.getRootBlip();
log.warning(rootBlip.getChildBlipIds().size());
Then get the following exception:
java.lang.NullPointerException
at com.google.wave.api.impl.BlipImpl.getChildBlipIds(BlipImpl.java:
170)
It seems the getChildBlipIds() doesn't work on rootBlip, also append()
can't work on rootBlip.
If we use a non-root blip to test the getChildBlipIds(); it will be
successful.
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