java - thymeleaf "Attempting to repost information that was already created"

I have created an app to create blog posts. Now I am attempting to update the application to do CRUD functionality. The original application is still working of which I have included a screen shot.

Blog Home screen

From their I can login and logout or I can create a new post. When I select a given username it should list all the post by username. See below:

Blog posts by username

From here I can select a particular blog post of which will pull up that blog post by username and it. Also,...

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By: StackOverFlow - Thursday, 8 November

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