Cannot resolve symbol 'Void'

Question

At the head of my class (I am taking over a project from someone else), I have the following:

using Java.Util;
using Object = Java.Lang.Object;
using Void = Java.Lang.Void;

Void, is showing in red, with a "Cannot resolve symbol 'Void'" and cannot see what I may be missing.

I have checked the PC where this came from (and the application does build on that one) and have installed the same (yes, I saw, newer, but specifically installed the "same" items) Java items:

Java 7 Update 45
Java 6 Update 31
Java SE Development Kit 6 Update 31

This hasn't made any change.

I have checked the 'References' branch of the project and everything is showing the same (in fact, I cannot see a specific reference to Java anywhere)

Any help would be appreciated to sort this.

Please understand that I am not looking to change the code; just to get the code (as is) to compile without error.

[Update]

When I type out Java.Lang. the intellisense does not show Void in the dropdown list

[Further Update]

This project is tied to the development for a tablet; for which I hadn't installed some of the development software - installing these has resolved the issue and I can only assume that the Java namespace is buried within the software. Whilst there's no specific answer in the responses, most of the comments have certainly helped to steer me in the right direction.

`Void` is not a thing in Java; `void` is a thing. BTW, I don't see how you can get it to compile when it is incorrect. — Bob Dalgleish, Jan 09 '14 at 10:39
@VibhorBhardwaj - The code compiles without this error on the PC from where it came, so there should be no need to change the "code"; the issue must be with something that is not installed on my PC, referenced or configured incorrectly, which is what I need to resolve. — Sean, Jan 09 '14 at 10:45
@V4Vendetta - Yes, with no effect. Also, as far as I know, there would be no need to use "Clean", if you use "ReBuild" (a ReBuild includes the Clean) — Sean, Jan 09 '14 at 10:50
@VibhorBhardwaj - could you advise where I would check that Java is added to the build path? — Sean, Jan 09 '14 at 10:52
@SeanAnderson Better remove the Java tag because this is specific to the C# development environment, and with the Java tag you are just attracting attention (and misguided advice!) of Java specialists. You should also name the technology by which you "import" Java into a C# project. — Marko Topolnik, Jan 09 '14 at 10:57
You can't use Java classes from a C# project, at least not directly... are you using something like [IKVM.NET](http://www.ikvm.net/) ? — Thomas Levesque, Jan 09 '14 at 11:05
If its the right hand one.. then you have a reference problem. It cannot find the type in the namespace you've provided. It still looks awfully weird.. — Simon Whitehead, Jan 09 '14 at 11:18
refer to this http://stackoverflow.com/questions/10839042/what-is-the-difference-between-java-lang-void-and-void and this http://stackoverflow.com/questions/2352447/what-is-the-need-of-void-class-in-java posts — Ricardo Appleton, Jan 09 '14 at 12:24
You should probably specify __in the question__ that this is C#, not Java. The context seems very important here. — Niels Abildgaard, Jan 13 '14 at 15:07

Lex Li · Answer 1 · 2014-02-07T05:50:24.923

There are several possible ways a C# project consuming Java bits,

Microsoft J#, which has been dead for a long time.
IKVM.NET, which originates from Mono.
dot42, a C# to Android compiler, which compiles C# to Android.
Xamarin.Android (aka Mono.Android).

Based on the fragment you pasted I think you might be opening a Xamarin.Android project in Visual Studio, as the using clauses match,

http://androidapi.xamarin.com/?link=N%3aJava.Util

http://androidapi.xamarin.com/?link=T%3aJava.Lang.Void

http://androidapi.xamarin.com/?link=T%3aJava.Lang.Object

Thus, you need to have Xamarin.Android completely installed on this machine. What you have (JRE and JDK) is obviously not enough.

dot42 does not have Java.Lang.Void and Java.Lang.Object, http://docs.dot42.com/Reference/NS.Java.Lang

score 0 · Answer 2 · edited May 23 '17 at 12:15

0

I think these links would be helpful for you.

What is the difference between java.lang.Void and void? http://docs.oracle.com/javase/7/docs/api/java/lang/class-use/Void.html

edited May 23 '17 at 12:15

Community

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answered Jan 13 '14 at 14:23

Seyed Hamed Shams

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This would imply a change to code; as commented this was not about correcting code, it was about getting an application to compile (which it was doing on another PC) – Sean Jan 14 '14 at 14:41

score 0 · Answer 3 · answered Jan 22 '14 at 22:19

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FAIL:

using Java.Lang.Void;
import Java.Lang.Void;

SUCCESS:

import java.lang.Void;

answered Jan 22 '14 at 22:19

TheRed__

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score -2 · Answer 4 · edited Jan 09 '14 at 19:31

-2

You have to use import instead of using.

import Java.Util.*;
Object blah = new Java.Lang.Object;

If you want to create an object that is null, do this:

Object obj = new Object();

If you want to add data set it equal to data such as a number.

obj = 7;

edited Jan 09 '14 at 19:31

poy

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answered Jan 09 '14 at 19:28

CrazyJohnny

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As discussed in the comments, this isn't Java. – Paul Bellora Jan 09 '14 at 19:37
But no one answered it as a response. – CrazyJohnny Jan 09 '14 at 19:39
Yes, because neither your answer nor "it's not Java" is a solution for this question. It's about getting that C# code to compile, with those using directives as they are. – grexter89 Jan 10 '14 at 12:43
Seemed to me like he was trying to program in java. Everything in his post relates to java. If you think he was trying to program in C# then you are wrong. – CrazyJohnny Jan 10 '14 at 19:10
I can confirm (as per the [Further Updates] in my original post; that this was resolved by installing some missing components. For clarification on the commnets: +grexter89 was correct that it was about getting C# code to compile (without making code changes) and +CrazyJohnny it is not code written in Java. – Sean Jan 14 '14 at 14:40
Sounds like you solved your problem!? You should post it as an answer to this question, so that other people with a similar problem can quickly get help here. – grexter89 Jan 15 '14 at 13:44

Cannot resolve symbol 'Void'

4 Answers4