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Interview Questions: Spring Expression Language

June 12, 2013
Qns-1: What are the features of Spring Expression Language?
Ans: Find the few features of Spring Expression Language
Literal expressions
Boolean and relational operators
Regular expressions
Class expressions
Accessing properties, arrays, lists, maps
Method invocation
Relational operators
Assignment
Calling constructors
Qns-2: What classes are used for Expression Evaluation in Spring?
Ans: Find the code snippet for expression evaluation.
ExpressionParser expPar = new SpelExpressionParser();
Expression exp = expPar.parseExpression("'Hi, My Name is Ram'");
String message = (String) exp.getValue();
 
Qns-3: What is the role of EvaluationContext in Spring?
Ans: EvaluationContext helps to resolve properties, methods, fields in an expression. EvaluationContext also helps in type conversion.
Qns-4: How many ways expression supports to define bean definitions?
Expression supports in both way
a. XML based configuration
b. Annotation-based configuration
Qns-5: What is the role of #this and #root variables in Spring Expression?
Ans: #this refers to the current evaluation object.
#root refers to the root context object.
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