Content autocomplete in spring tool suite 4

问题:

The autocomplete for content is not working in spring tool suite 4. I have checked the settings

enter image description here

Could anyone tell me how to solve this.

For Example:

if I enter Math. -> and press ctrl + space for suggestions it show no default templates.

回答1:

In the Auto Activation section fill in Auto activation triggers for Java:

abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ._