I got what he said thats what I have used

  | String evaluate(String expression) {
  |         if (expression==null) {
  |             System.out.println("exp is null");
  |           return null;
  |         }
  |         VariableResolver variableResolver = 
JbpmExpressionEvaluator.getUsedVariableResolver();
  |         System.out.println("resolver is " + variableResolver);
  |         if (variableResolver!=null) {
  |             
  |                 
  |         return (String) JbpmExpressionEvaluator.evaluate(expression, 
executionContext, 
  |                     variableResolver, null);
  |       }
  | 

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