Is SpelExpression in spring-el thread safe?

Question

Expression exp = parser.parseExpression("myParam.getValue()");

Is the Expression class thread safe? I would like to store it in global cache, like ConcurrentHashMap to avoid compilation with every access.

Answer 1

Well Expression is an interface, not a class. But, yes, if your parser is a standard SpelExpressionParser, the resulting SpelExpression implementation is thread-safe. In general, evaluation contexts are too, as long as you don't mutate them (e.g. changing variables, functions) while being used.