@NonNullApi @NonNullFields
See: Description
| Class | Description | 
|---|---|
| SpelCompiler | A SpelCompiler will take a regular parsed expression and create (and load) a class
 containing byte code that does the same thing as that expression. | 
| SpelExpression | A  SpelExpressionrepresents a parsed (valid) expression that is ready to be
 evaluated in a specified context. | 
| SpelExpressionParser | SpEL parser. |