Have a look at this...
I had the same issue. I added an extra property named <property name="RowsPerPollingInterval" value="5"/> in the JCA file of polling adapter and it worked. In my case, I am using
<property name="MaxRaiseSize" value="5"/> and <property name="MaxTransactionSize" value="5"/> . Hope, it will work for 100 too as defined in your JCA file.
Also make sure that you have added property viz. <property name="singleton" many="false">true</property> in composite.xml for that JCA file.
Best of Luck.