[OFBIZ-7810] Enforce noninstantiability to UelUtil class

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Trunk
• Fix Version/s: 16.11.01
• Component/s: framework
• Sprint: Community Day 2 - 2016, OFBiz Community Day (May 2020)
• Assignee: Arun Patidar
• Reporter: Arun Patidar
• Created: 15/Jul/16 15:32
• Updated: 05/Aug/16 15:41
• Resolved: 05/Aug/16 15:41

Description

• Make class as final.
• Add a private constructor.
• Make following protected variable as private

      protected static final ExpressionFactory exprFactory = JuelConnector.newExpressionFactory();
      protected static final ELResolver defaultResolver = new ExtendedCompositeResolver()
  

• Make following protected classes as private and do related changes for variables in them;

      protected static class BasicContext extends ELContext
      protected static class ReadOnlyContext extends ELContext
         protected static class ReadOnlyVariableMapper extends VariableMapper
      protected static class BasicVariableMapper extends VariableMapper
      protected static class ReadOnlyExpression extends ValueExpression
      protected static class BasicValueExpression extends ValueExpression
      protected static class ExtendedCompositeResolver extends CompositeELResolver
      protected static class ExtendedListResolver extends ListELResolver
      protected static class ExtendedMapResolver extends MapELResolver