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I have a app where my users input a HTML template with SimpleTemplateEngine notation, and execute this template with code above, in a Java Class:

new SimpleTemplateEngine().createTemplate(templateStr).make(map).toString()

and I obtain this error:

groovy.lang.GroovyRuntimeException: Could not instantiate custom Metaclass for class: java.util.ArrayList. Reason: java.lang.NoSuchMethodException: groovy.runtime.metaclass.java.util.ArrayListMetaClass.<init>(groovy.lang.MetaClass)

I observe that error occurrs in a loop in a java.util.ArrayLIst in a JPA Entity loaded by Hibernate:

<%for(int k=0; k< Registro[i].listUsers.size();k++){%>

HTML CODE

<%}%>

Anyone can help me? I no have more ideas about this error... Thanks!

Igor
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1 Answers1

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I'm guessing that the part Registro[i] is for getting the value of a static property which name is held under the variable i (or at least that is what will happen) unless the getAt(String) method has been overloaded on Registro.

Either way I also guess that returns an object that has a listUsers property that should be at least a Collection.

Maybe the problem is with the initialization of said listUsers property.

Some Registro code could be used for better understanding.

Alfergon
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  • The list is initialized like a ArrayList. I don't believe that is the problem. – Igor Sep 27 '13 at 18:16
  • The problem ocurrs when I use a java.lang.String or a java.util.List not instantiate like a LinkedList. – Igor Sep 27 '13 at 18:23