frida-go fails with "Java API not available" on Frida 16.6.6

[ilCollez]

Hi, I'm experiencing an issue when using frida-go with Frida 16.6.6.

If I run the following command from the CLI, everything works as expected, and my script is loaded correctly:

frida -U -l /path/to/script.js -f <package>

However, when trying to achieve the same using the attached Go script, the application crashes with the following error:

{"type":"error","description":"Error: Java API not available","stack":"Error: Java API not available\n    at _checkAvailable (frida/node_modules/frida-java-bridge/index.js:296)\n    at perform (frida/node_modules/frida-java-bridge/index.js:201)\n    at <anonymous> (/frida-go.js:10)\n    at apply (native)\n    at <anonymous> (frida/runtime/core.js:51)","fileName":"frida/node_modules/frida-java-bridge/index.js","lineNumber":296,"columnNumber":1}

I'm using the latest versions of:

• frida-tools 16.6.6
• frida-server 16.6.6
• frida-go 0.12.1

Is there anything I might be missing, or is this a known issue?

This is the Go script I'm using:

Go Script

package main

import (
	"log"
	"os"

	frida "github.com/frida/frida-go/frida"
)

func main() {
	if len(os.Args) < 3 {
		log.Fatalf("Usage: %s <device-id> <path/to/script.js> <package>", os.Args[0])
	}

	deviceId := os.Args[1]
	scriptPath := os.Args[2]
	packageName := os.Args[3]

	log.Printf("Launching %s with %s\n", packageName, scriptPath)

	// Get Frida manager
	manager := frida.NewDeviceManager()
	devices, err := manager.EnumerateDevices()
	if err != nil {
		log.Fatalf("failed to enumerate device due to %v", err)
	}

	var device frida.DeviceInt
	for _, dev := range devices {
		if dev.ID() == deviceId {
			device = dev
			break
		}
	}

	if device == nil || device.ID() == "" {
		log.Fatalf("no device found with id %s", deviceId)
	}

	log.Printf("Connected to %s\n", device.ID())

	opts := frida.NewSpawnOptions()

	// Spawn the target app
	pid, err := device.Spawn(packageName, opts)
	if err != nil {
		log.Fatalf("Failed to spawn process: %v", err)
	}

	// Attach to the process
	session, err := device.Attach(pid, nil)
	if err != nil {
		log.Fatalf("Failed to attach to process: %v", err)
	}

	// Load the script
	scriptData, err := os.ReadFile(scriptPath)
	if err != nil {
		log.Fatalf("Failed to read script file: %v", err)
	}

	script, err := session.CreateScript(string(scriptData))
	if err != nil {
		log.Fatalf("Failed to create script: %v", err)
	}

	script.On("message", func(msg string) {
		log.Printf("Frida Message: %s", msg)
	})

	// Load the script into the target process
	err = script.Load()
	if err != nil {
		log.Fatalf("Failed to load script: %v", err)
	}

	device.Resume(pid)
}

Thanks in advance! 😊

[NSEcho]

Hey, to be honest I have no idea why that is happening as the code looks okay to me. Could you add one more line to keep the loop running

r := bufio.NewReader(os.Stdin)
r.ReadLine()

[ilCollez]

Hey, the behaviour is the same but I keep getting the error mentioned above (Java API not available ecc..), I don't really know what's going on