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Pressing the enter key receive extra invalid data

 
albert kao
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Posts: 252
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Pressing the enter key at the jsp page receive extra invalid data at the ProdController.java.
The alertgroupStr receive "unack" as expected.
However, I do not understand why alertgroupStr receive the extra invalid "null" later.
Debug log:
11:14:52,187 DEBUG com.systems.monitoring.war.ProdController:54 - alertgroupStr unack
...
11:14:52,187 DEBUG com.systems.monitoring.war.ProdController:54 - alertgroupStr null

ProdController.java:


Jsp page:
 
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