frida: Error: a(): argument types do not match any of: overload('int', 'int', 'long', 'java.lang.String', 'java.lang.Object')

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I'm trying to call a method with this signature (int, int, long, String, Object) The problem is the last parameter needs to be a String array When I hook it and print its last parameters something like this will be shown:

[Ljava.lang.String@abcd1234;

And If I pass it, the function works fine But when I change it to my custom String array

Like below:

const arrayList = Java.use("java.util.ArrayList")
const myArray = arrayList.$new()

myArray.add("test")
myArray.add("test-1")

const stringArr = myArray.toArray()

this.a(arguments[0], arguments[1], arguments[2], arguments[3], stringArr)

will throw error:

Error: a(): argument types do not match any of:
        .overload('int', 'int', 'long', 'java.lang.String', 'java.lang.Object')
    at X (frida/node_modules/frida-java-bridge/lib/class-factory.js:563)
    at value (frida/node_modules/frida-java-bridge/lib/class-factory.js:967)
    at e (frida/node_modules/frida-java-bridge/lib/class-factory.js:547)
    at <anonymous> (/script1.js:94)
    at <anonymous> (frida/node_modules/frida-java-bridge/lib/vm.js:12)
    at perform (frida/node_modules/frida-java-bridge/index.js:193)
    at ms_bd_c_h_a (/script1.js:99)
    at apply (native)
    at <anonymous> (frida/runtime/message-dispatcher.js:13)
    at c (frida/runtime/message-dispatcher.js:23)

What should I do?

frida reverse-engineering java
1 Answers

In your code you let Frida decide which overloaded method to call based on the arguments. As you have noticed this can get complicated (and even mor if you want to pass null or other ambiguous arguments).

Therefore my recommendation is to first define the method you want to call and then call it:

const cls = Java.use(<name of the class of a>)
const methodA = cls.overload('int', 'int', 'long', 'java.lang.String', '[java.lang.String')
methodA.call(this, arguments[0], arguments[1], arguments[2], arguments[3], stringArr)
user_1509780
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