Smack sendStanza function return AssertionError after upgrading Android Gradle Plugin to 4.1

Smack Smack Support
1

Hi
After upgrading gradle version to 7.3.3 and gradle plugin to 7.2.1 my app start to get this exception

java.lang.AssertionError
at org.jivesoftware.smack.AbstractXMPPConnection.sendStanza(AbstractXMPPConnection.java:686)

This is the relevant part in AbstractXMPPConnection.java:

 @Override
    public void sendStanza(Stanza stanza) throws NotConnectedException, InterruptedException {
        Objects.requireNonNull(stanza, "Stanza must not be null");
        assert (stanza instanceof Message || stanza instanceof Presence || stanza instanceof IQ);

My app only crashes when i upgrade gradle version and only in debug mode this happend so i searched and find this change and i think this is the problem

Assertions in debug builds

When you build the debug version of your app using Android Gradle plugin 4.1.0 and higher, the built-in compiler (D8) will rewrite your app’s code to enable assertions at compile time, so you always have assertion checks active.

So do you have any idea how i can prevent this problem?
Thanks

2

Which Smack version is this?

3

I’m using version 4.3.2
After I updated smack to the latest version, nothing changed and the problem still exists

4

Next step would be to find out the type of the stanza instance that is triggering the assertion. To do so, attach a debugger, create a breakpoint for AssertionErrors and inspect the stanza insance that is causing the assertion to trigger to find out its type.

5

I create custom stanza like this

object : Stanza() {
            override fun toXML(enclosingNamespace: String?) = ""
            override fun toString() = ""
        }

This stanza works in release mode and there is no problem, but in debug mode it creates an assertion error

6

Well, Smack users are not supposed to create their own subclasses of Stanza. Smack provides sufficient extension interfaces allowing users to put “their” XML on the XMPP wire.

7

Sorry i couldn’t find any documentation about this extension interfaces to implement my xml, can you send a link or any example how to implement it

8

First I would need to know what you are trying to achieve.

9

My xml is about querying an archive and it look like this:

<iq type='set' id='juliet1'>
  <query xmlns='urn:xmpp:mam:2'>
    <x xmlns='jabber:x:data' type='submit'>
      <field var='FORM_TYPE' type='hidden'>
        <value>urn:xmpp:mam:2</value>
      </field>
      <field var='with'>
        <value>juliet@capulet.lit</value>
      </field>
    </x>
  <set xmlns='http://jabber.org/protocol/rsm'>
                         <max>10</max>
                         <before>$lastId</before>
                       </set>
  </query>
</iq>
10

Any reason why you don’t use Smack’s MAM API from smackx.mam then? :slight_smile:

1 Like
11

Thanks for your reply, it worked for me.
Is there a general solution for all xmls?

12

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