I recently downloaded the latest version of the Spring Tool Suite (STS) on my Mac device and when I created the first Spring Web Services tool, I realized I was not able to make use of the autocomplete for Java code nor the Spring Annotations,
Fix:Go to Preferences.. -> Java -> Editor -> Content Assist -> Auto Activation and replace the below line in "Auto Activation trigger for Java",
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ._
Click Apply and close!

https://github.com/spring-projects/sts4/issues/82
https://github.com/spring-projects/sts4/issues/510
https://stackoverflow.com/questions/53129538/content-autocomplete-in-spring-tool-suite-4
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