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What causes Backing Bean return null? How to resolve it?

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Hello everyone I'm very new to javaweb and I tried to create my first javaweb project. However when some action were being invoke I received an error. Does anyone can help! Here is what I did:




When tried to run my project what happened were:
1. When i clicked the link from show.xhtml

It output the page but without data being displayed.

but on the url it shows:


1. When i clicked 'Save' button in create.xhtml here is the error i received:

An Error Occurred:

I expand Stack Trace and it displayed

I don't know what makes my null.

Any Help is very much appreciated.
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