[jira] [Created] (NETBEANS-3755) "Can use functional operations" hint creates uncompilable code with nested loops (Unexpected return value)

[dennis lucero (Jira)]

dennis lucero created NETBEANS-3755:
---------------------------------------

             Summary: "Can use functional operations" hint creates uncompilable 
code with nested loops (Unexpected return value)
                 Key: NETBEANS-3755
                 URL: https://issues.apache.org/jira/browse/NETBEANS-3755
             Project: NetBeans
          Issue Type: Bug
          Components: java - Hints
    Affects Versions: 11.2
         Environment: OpenJDK 13+33
            Reporter: dennis lucero


Consider this code:
{code:java}
private static boolean deepContains(
        final String needle,
        final Collection<Collection<String>> haystack) {
    for (final Collection<String> hay : haystack) {
        for (final String check : hay) {
            if (check.equals(needle)) {
                return true;
            }
        }
    }
    return false;
}
{code}
NetBeans suggests to replace the outer loop with with a functional operation, 
resulting in
{code:java}
private static boolean deepContains(
        final String needle,
        final Collection<Collection<String>> haystack) {
    haystack.forEach((hay) -> {
        for (final String check : hay) {
            if (check.equals(needle)) {
                return true;
            }
        }
    });
    return false;
}
{code}
This does not compile. Error messages:
 For the outer loop:
{quote}incompatible types: unexpected return value
{quote}
For the inner loop:
 
{quote}for-each not applicable to expression type
required: array or java.lang.Iterable
found: T
where T is a type-variable:
T extends Object declared in interface Iterable
{quote}



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