martin-g commented on pull request #321:
URL: https://github.com/apache/tomcat/pull/321#issuecomment-657513641


   @hazendaz Thanks for your comments! See 
https://www.guardsquare.com/en/blog/string-concatenation-java-9-untangling-invokedynamic
 - Java 8 already uses StringBuilder. Java 9+ makes it more flexible but still 
preserves the speed of concatenating strings. But as pointed by others those 
are not hot paths in Tomcat. So this change is mostly for better readability


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