[v0.90.3] java.lang.NoClassDefFoundError issue with FormatCache on Android 6 and lower

[papjul]

As reported by an user in breezy-weather/breezy-weather#1432, xmlutil crashes with the java.lang.NoClassDefFoundError exception on Android 6 and lower. It used to work in v0.90.2.

Let me know if you can't reproduce the issue with a minimum code; I will see if I can help.

[pdvrieze]

@papjul Do you use any minification?

The lambda in the case is a function that creates a cache as needed for threadlocals.

As a workaround it should be possible to disable the cache with:

XML {
  policy = DefaultXmlSerializationPolicy(FormatCache.Dummy)
}

Note that this path should avoid ever reading the default as creates the policy without setting a temporary policy.

[pdvrieze]

Alternatively you may need to inform proguard to keep that class around.

[papjul]

I do use minification on release versions. The report from the user is from the non-minified debug version as we can see from the logs. Also, it's specific to Android versions 6 and lower, so it would affect all versions if it was for this reason, right?

[pdvrieze]

@papjul I suspect this is an issue with code lowering/R8. I've just pushed a workaround that will just use a dummy cache if an error is thrown creating the default cache.