Tipo Vazio

[leonelsanchesdasilva]

Teste:

tipo Vazio
fim

q = Vazio()

Execução:

Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.util.List.iterator()" because "<parameter1>.children" is null
        at br.edu.ifrn.potigol.Listener.exitMembros(Listener.java:463)
        at br.edu.ifrn.potigol.parser.potigolParser$MembrosContext.exitRule(potigolParser.java:1178)
        at org.antlr.v4.runtime.tree.ParseTreeWalker.exitRule(ParseTreeWalker.java:62)
        at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:38)
        at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:36)
        at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:36)
        at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:36)
        at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:36)
        at br.edu.ifrn.potigol.Principal.getListnerFromString(Principal.java:114)
        at br.edu.ifrn.potigol.Principal.getListner(Principal.java:103)
        at br.edu.ifrn.potigol.Principal.main(Principal.java:86)