Calling Java method from JSNI

I have a class, for instance :

public class Person {

    private String name;

    public Person(String name) {
        this.name = name;
    }

    public void sayName() {
        System.out.println(name);
    }
}

Does it would be work if i call method like this (or where my ingorance or mistake):

public native void someMethod (Person person) /*-{
    person.sayName();
}-*/;

Solution

From Accessing Java Methods and Fields from JavaScript documentation:

The syntax is:

[instance-expr.]@class-name::method-name(param-signature)(arguments)

instance-expr. : must be present when calling an instance method and must be absent when calling a static method

class-name : is the fully-qualified name of the class in which the method is declared (or a subclass thereof)

param-signature : is the internal Java method signature as specified at JNI Type Signatures but without the trailing signature of the method return type since it is not needed to choose the overload

arguments : is the actual argument list to pass to the called method

Here are JNI Type Signatures:

Type Signature               Java Type
Z                            boolean
B                            byte
C                            char
S                            short
I                            int
J                            long
F                            float
D                            double
L fully-qualified-class ;    fully-qualified-class
[ type                       type[]
( arg-types ) ret-type       method type

For example, the Java method:

long f (int n, String s, int[] arr); 
has the following type signature:

(ILjava/lang/String;[I)J

In your case (no parameters) it would be:

public native void someMethod (Person person) /*-{
    [email protected]::sayName()();
}-*/;

Replace your.package.name with a real package name.