MVEL is used to evaluate the simple expression, user defined functions, MVEL supported expressions like if else, ternary conditions.

Pseudo code:

public class expressionResolver{

MapVariableResolverFactory functionFactory = new MapVariableResolverFactory();
ParserContext parserContext = new ParserContext();

if( config has "function"){
 MVEL.eval(function, functionFactory);
}else {
   // read name and values from config
   // <update type="String" name="colO" value="colO.concat(colR)" />
  Serializable compiledExpr = MVELpileExpression(value, parserContext);

  VariableResolverFactory rowResolver = new MapVariableResolverFactory(runtimeVars);
  rowResolver.setNextFactory(functionFactory);

  Object result = MVEL.executeExpression(expr.getCompiledExpr(), rowResolver);
}
}

Here when I have undefined function in my config file, which is been called, that should be caught during compilation and not during execution.

For eg: Here multiplyByThree is called where def has multiplyByTwo, this is caught during execution, but ideally it should be caught at compilation.

<function name="multiplyByTwo" value="def multiplyByTwo(x) { x * 2; }" />
<add type="Integer" name="multiply" value="multiplyByThree(colC))"/>

Kindly suggest any MVEL API is there which can help to capture the undefined function call during compilation.