Java Method Overloading

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pierre...@gmail.com

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Apr 20, 2021, 5:34:57 AMApr 20
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I have a model class Item with a Integer value. I builded an app using this model.
For a new particular case, the value should be a Float as well.
So I changed the type of value to Float and regenerate setter/getter. 
In order to not change the current app, I try to create a overloading method : 
public void setValue(Integer value) {
this.value = value.floatValue();
}
At java level, everything seems ok, all compile errors are solved. But at GWT compilation, the call of this method complains with :
            [ERROR] Line 93: The method setValue(Float) in the type Item is not applicable for the arguments (Integer)
 like if GWT doesnot see my method setValue(Integer).
 
 Am I missing something ? Is there a way to make this works without creating a second separate attribute ?
Thanks in advance 

lofid...@gmail.com

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Apr 20, 2021, 12:54:28 PMApr 20
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Could you show me the whole class?

this.value cannot be an Integer...

....

// This won't work in Java - Type mismatch...
private Integer value;

public void setValue(Integer value) {
   this.value = value.floatValue();
}

pierre...@gmail.com

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Apr 21, 2021, 2:50:31 AMApr 21
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The value was an Integer but is now an Float:

private  Float  value;

The "normal" setter is now: 
public void setValue(Float value) {
this.value = value;
}
Then, I added this method  to accomodate the current app   :

public void setValue(Integer value) {
this.value = value.floatValue();
}
Thanks for any hint
Pierre

lofid...@gmail.com

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Apr 21, 2021, 3:44:27 PMApr 21
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Hi,

I could confirm your problem. Here is an example: 


[INFO] --- gwt-maven-plugin:1.0.0:compile (default) @ jsinterop-simple-example ---
[INFO] Compiling module com.github.lofi.Calculator
[INFO]    Errors in com/github/lofi/client/Calculator.java
[INFO]       [ERROR] Line 33: 'void Calculator.setValue(Float)' and 'void Calculator.setValue(Integer)' cannot both use the same JavaScript name 'setValue'.
[INFO]       [WARN] Line 33: [unusable-by-js] Type of parameter 'value' in 'void Calculator.setValue(Float)' is not usable by but exposed to JavaScript.
[INFO]       [WARN] Line 37: [unusable-by-js] Type of parameter 'value' in 'void Calculator.setValue(Integer)' is not usable by but exposed to JavaScript.
[INFO]    [WARN] Suppress "[unusable-by-js]" warnings by adding a `@SuppressWarnings("unusable-by-js")` annotation to the corresponding member.

lofid...@gmail.com

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Apr 21, 2021, 3:47:35 PMApr 21
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I ask on the Gitter channel: https://gitter.im/gwtproject/gwt

Michael Conrad

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Apr 21, 2021, 4:02:48 PMApr 21
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The error reads like you need to mark one the methods as not exported to JS

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lofid...@gmail.com

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Apr 21, 2021, 4:21:57 PMApr 21
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Yes, thanks.

Here is the result, I documented here with examples: https://github.com/lofidewanto/gwt-overloading

Hope this helps,
Lofi

pierre...@gmail.com

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Apr 22, 2021, 2:01:39 AMApr 22
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Thanks a lot, Lofi for your help. My code is similar to your CalculatorNoExport class as I dont use jsInterop.
I tried your example and it's works with the same GWTversion 2.9.0. So for now, I dont have any clue what prevents this to not work in my project.
Of course, it's more complex than your example, I use GWT Material Design for UI and RestyGwt for accessing Rest service ...
Pierre
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