Enthuware

I think it is necessary to add valid "session" parameter to explanation to make it clear that "taglib" is the correct answer.

The explanation has been updated.
Thank you for your feedback!

Explanation under isThreadSafe:

The JSP standard allows multiple instances of a JSP to exist for JSPs that are not thread safe. This enables the container to handle requests more efficiently .

However, the JSP spec says regarding isThreadSafe:

Indicates the level of thread safety implemented in the page. If false then the JSP container shall dispatch multiple outstanding client requests, one at a time, in the order they were received, to the page implementation for processing.

It seems the spec is mandating the container to serialize access against a single JSP servlet instance? This goes against what the Servlet spec says regarding SingleThreadModel, which allows implementation to serialize OR create multiple instances.