Question

Here is sample code that throws a Servlet Exception as invalid expression error.

data Types are thus:

boolean: bean1.isValid1
boolean: bean1.isValid2
boolean: bean1.isValidSubCondn

String: bean2.StringData1 
String: bean2.StringData2 

want to use this inside JSTL tag:

 <x:div id="someID" 
               rendered='#{!bean1.isValid1 || bean1.isValid2 ? (bean1.isValidSubCondn ? bean2.StringData1.matches("^a|^b") : bean2.StringData2.matches("^c|^d") ) : "true"}'>

Now if this works, I would like to add a method call instead of doing the RegEx check within the JSP itself. That doesn’t work either – probably has to do with the same syntax issue.

[ServletException in:/beanName.jsp] 
 Invalid expression:
  '${!bean1.booleanProperty1 && bean1.booleanProperty2? (beanInstance.booleanProperty3 ? beanName.methodName1(bean2.stringProperty) : beanName.methodName1(bean3.stringProperty) ) :'true'}'' 

My JSP code is thus:

   <x:div id="something" rendered="#{not bean1.booleanProperty1 or (bean1.booleanProperty2 ? (beanInstance.booleanProperty3 ? beanName.methodName1(bean2.stringProperty) : beanName.methodName1(bean3.stringProperty) )) :true}"> 

This doesn’t work either:

   <x:div id="something" rendered="#{!bean1.booleanProperty1 || bean1.booleanProperty2 ? (beanInstance.booleanProperty3 ? beanName.methodName1(bean2.stringProperty) : beanName.methodName1(bean3.stringProperty) ) :true}"> 

The beanName.methodName1 is thus:

public boolean methodName1(String stringValuex) {
    if(stringValuex.matches("^A|^B"))
        { return true; }

   return false; 
 }

alternatively, I tried using the getter/setter method approach in the bean class, to get and set the property. Doesn’t work in the JSP either. Not sure how to resolve.
I need to perform a validation using a bean data of another class to display certain results.

Here is the setter/getter approach, need to figure out how to use this, then, in the JSP validation.

   <x:div id="something" rendered="#{!bean1.booleanProperty1 and bean1.booleanProperty2 ? (beanInstance.booleanProperty3 ? beanName.booleanFieldName(bean2.stringProperty) : beanName.booleanFieldName(bean3.stringProperty) ) : true}"> 

beanName.java class

 private boolean booleanFieldName = false;
   public boolean getbooleanFieldName() {
        return this.booleanFieldName;
    }

    public void setbooleanFieldName(String valueToTest) {
         if(valueToTest.matches("^a|^A"))
            { this.booleanFieldName= true;
            }
        this.booleanFieldName= false; 
    }

Answer 1

You can’t mix types in a ternary, and you are mixing booleanwithString“true”`.

Try this, replacing "true" with true:

rendered='#{!bean1.isValid1 || bean1.isValid2 ? (bean1.isValidSubCondn ? bean2.StringData1.matches("^a|^b") : bean2.StringData2 .matches("^c|^d") ) : true}'>