Configure Ice in android studio

amos

**Hello,
1- I am trying to setup an android project using ice. Unfortunately I can not get it work. I get this error:
**
A problem was found with the configuration of task ':app:compileSlice' (type 'SliceTask').
- In plugin 'com.zeroc.gradle.ice-builder.slice' type 'com.zeroc.gradle.icebuilder.slice.SliceTask' property 'timestamps' is missing an input or output annotation.

• Try:
  Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Exception is:
  org.gradle.internal.execution.WorkValidationException: A problem was found with the configuration of task ':app:compileSlice' (type 'SliceTask').

  • In plugin 'com.zeroc.gradle.ice-builder.slice' type 'com.zeroc.gradle.icebuilder.slice.SliceTask' property 'timestamps' is missing an input or output annotation.

  Reason: A property without annotation isn't considered during up-to-date checking.

  Possible solutions:

  1. Add an input or output annotation.
  2. Mark it as @Internal.

**2- In my build gradle file i add:
**

plugins {
    id  'com.android.application'

    id "com.zeroc.gradle.ice-builder.slice" version "1.4.7"
}
dependencies {

    implementation 'com.zeroc:ice:3.7.4'

    }

**
3- Here is my client implementation code
**

  try(com.zeroc.Ice.Communicator communicator = com.zeroc.Ice.Util.initialize())
        {
            // #base = ic.stringToProxy("SimplePrinter:tcp -h 192.168.154.161 -p 10000")

            com.zeroc.Ice.ObjectPrx base = communicator.stringToProxy("SimplePrinter:default -p 10000");
           // com.zeroc.Ice.ObjectPrx base = communicator.stringToProxy("SimplePrinter:tcp -h 192.168.65.161 -p 10000");

            com.example.asr.Demo.PrinterPrx printer = com.example.asr.Demo.PrinterPrx.checkedCast(base);
            if(printer == null)
            {
                throw new Error("Invalid proxy");
            }
            printer.printString("Hello World!");
        }

amos

This is for my middleware project at Avignon University and I am running out of time.
Thank your for your help.

xdm

You should update the builder version from 1.4.7 to 1.5.0

https://plugins.gradle.org/plugin/com.zeroc.gradle.ice-builder.slice

amos

Thanks for your help, there is no more errors when compiling but I am trying to print a simple text message using a real android device and it is not working. Here is my implementation:

 try(com.zeroc.Ice.Communicator communicator = com.zeroc.Ice.Util.initialize())
        {

            // #base = ic.stringToProxy("SimplePrinter:tcp -h 192.168.154.161 -p 10000")

            //com.zeroc.Ice.ObjectPrx base = communicator.stringToProxy("SimplePrinter:default -p 10000");
            com.zeroc.Ice.ObjectPrx base = communicator.stringToProxy("SimplePrinter:tcp -h 10.120.25.162 -p 10000");

            Log.d("Ice","This code is executed");

            com.example.asr.Demo.PrinterPrx printer = com.example.asr.Demo.PrinterPrx.checkedCast(base);

           Log.d("Ice","This line is not executed");

            if(printer == null)
            {
                Log.d("Adapter","2");

                throw new Error("Invalid proxy");
            }

            Log.d("Ice","This part is not excuted");

            printer.printString("Hello World!");

            Log.d("Adapter","Print String works");

        }catch(Exception e){
           Log.d("Exeption","ice failed");

           System.out.println(e);
       }

Could you please help me?

Thank you!!

xdm

The checkedCast operation does a remote produce call, if the device cannot contact the remote endpoint it could take some time to get a failure, You should add an invocation timeout to ensure this can report a failure in a timely manner, enabling network and protocol tracing is also helpful to debug issues like this:

InitializationData initData = new InitializationData();
initData.properties = Util.createProperties();
initData.properties.setProperty("Ice.Trace.Network", "3");
initData.properties.setProperty("Ice.Trace.Protocol", "1");

 try(com.zeroc.Ice.Communicator communicator = com.zeroc.Ice.Util.initialize(initData))
 {

     ...

    com.zeroc.Ice.ObjectPrx base = communicator.stringToProxy("SimplePrinter:tcp -h 10.120.25.162 -p 10000");
    base.ice_invocationTimeout(2000); // 2 seconds
    ...
 }

amos

When debugging I find this: System.out: com.zeroc.Ice.SocketException

amos

I/System.out: java.net.SocketException: Operation not permitted

xdm

Seems like your application manifest is missing the permissions to access the network, see https://github.com/zeroc-ice/ice-demos/blob/f362b7f0115134659e092a35b1eec7d503b234a9/java/android/hello/src/main/AndroidManifest.xml#L7-L11

Those are better documented in Android documentation.

amos

Hello, it works now, but there is an other issue. The app closed unexpectedly when i launch it on my phone. I do not have any idea about this issue.

amos

Here is my server configuration.

try:
    ic = Ice.initialize(sys.argv)
    adapter = ic.createObjectAdapterWithEndpoints(
    "SimplePrinterAdapter", "tcp  -p 10000")
    object = PrinterI()
    adapter.add(object, ic.stringToIdentity("SimplePrinter"))
    adapter.activate()
    ic.waitForShutdown()
except:
    traceback.print_exc()
    status = 1

if ic:
    # Clean up
    try:
        ic.destroy()
    except:
        traceback.print_exc()
        status = 1

Android client:

 try(com.zeroc.Ice.Communicator communicator = com.zeroc.Ice.Util.initialize())
        {
            // #base = ic.stringToProxy("SimplePrinter:tcp -h 192.168.154.161 -p 10000")

            //com.zeroc.Ice.ObjectPrx base = communicator.stringToProxy("SimplePrinter:default -p 10000");
            Log.d("Ice","This code is executed");

            com.zeroc.Ice.ObjectPrx base = communicator.stringToProxy("SimplePrinter:tcp -h 192.168.248.161 -p 10000");
            Log.d("Ice","This code is executed");

            com.example.asr.Demo.PrinterPrx printer = com.example.asr.Demo.PrinterPrx.checkedCast(base);
            Log.d("Ice","This line is not executed");

            if(printer == null)
            {
                Log.d("Adapter","2");

                throw new Error("Invalid proxy");
            }
            Log.d("Ice","This part is not executed");

            printer.printString("Hello World!");
            Log.d("Adapter","Print String works");

        }catch(Exception e){
            Log.d("Exception","ice failed");

            System.out.println(e.getMessage());
        }

At the end the printer is null when i using a real android device. By using an other client from an other computer it works fine.But it does not work when using my android real device.

xdm

does it work with android simulator? does the checked cast return a null proxy or throws an exception?

amos

It returns a null proxy.

amos

It does not work with emulator.

xdm

If checkedCast returns null it means the target object doesn't implement the given interface, this could happen if there is a mismatch between the client and server definitions.

But in your example it reads

Log.d("Ice","This line is not executed");

If this is not executed then checkedCast must be throwing an exception.

amos

Yes this line is executed. But printer always returns null.