Netbeans User 2019 created NETBEANS-3967:
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Summary: Hint about dereferencing null pointer is wrong
Key: NETBEANS-3967
URL: https://issues.apache.org/jira/browse/NETBEANS-3967
Project: NetBeans
Issue Type: Bug
Components: editor - Hints & Annotations, java - Hints
Affects Versions: 11.2, 11.3
Environment: OpenJDK 11.0.2
Reporter: Netbeans User 2019
public static void main(String[] args) {
Optional.ofNullable(getValue())//as instance of java.util.Optional
.map((o)->o instanceof String ? ((String)o).substring(0) : o.toString());
}
private static Object getValue() {
return "";
}
o.toString() show hint about dereferencing possible null pointer, but this is
not possible in that case as check is ensured by optional. In example is used
"String" for simplification, but in more abstract case you want to get value
one way if it is instance of anything and other way from "o" if it is not
instance of that type.
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