Honza-cz opened a new issue, #6311:
URL: https://github.com/apache/netbeans/issues/6311
### Apache NetBeans version
Apache NetBeans 18
### What happened
When using Optional/Stream and other monads, netbeans is not able to extract
method correctly from lambda expression. Input parameters are missing (in some
cases).
I am willing to fix it if you can provide a pointer, which module/java class
is responsible for that.
### How to reproduce
Assume following code:
```
public class ExtractMethodDemo {
public static void main(String[] args) {
String first = "hello";
String second = "world";
System.out.println(
java.util.Optional.ofNullable("-")
.map(t -> first + t + second)
.orElseThrow()
);
}
}
```
I would like to move code `t -> first + t + second` to a new method, some
kind or parametrized factory, so I select it ALT SHIFT M (extract method)
It creates following not compilable method
```
public class ExtractMethodDemo {
public static void main(String[] args) {
String first = "hello";
String second = "world";
System.out.println(java.util.Optional.ofNullable("-")
.map(factory())
.orElseThrow()
);
}
private static Function<String, String> factory() {
return t -> first + t + second;
}
}
```
Function lacks input parameters as `Function<String, String> factory(String
first, String second)`
### Did this work correctly in an earlier version?
No / Don't know
### Operating System
Ubuntu
### JDK
8/17
### Apache NetBeans packaging
Apache NetBeans binary zip
### Anything else
_No response_
### Are you willing to submit a pull request?
Yes
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