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Should I use StringBuilder or StringBuffer for webapps?

I am writing webapp in Java 1.6 and running it in tomcat. Although I don't make any explicit threads, I wonder what happens behind the scenes with Spring and Tomcat. Will I encounter any problems using StringBuilder instead of StringBuffer?

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If you use a local variable, you can safely use StringBuilder. Each thread will receive its own instance.

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This means that your operations with your StringBuffer will be safe, even if you are in a multi-threaded environment [for example, in a web application]. The security of your StringBuffer instance as such is determined by the scope of the variable.

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