Error when using proguard

[Vikviita]

Missing class java.net.http.HttpResponse (referenced from: org.hildan.krossbow.websocket.ktor.HandshakeFailureDetails org.hildan.krossbow.websocket.ktor.HandshakeExceptionsJvmKt.extractHandshakeFailureDetails(java.net.http.WebSocketHandshakeException))
Missing class java.net.http.WebSocketHandshakeException (referenced from: org.hildan.krossbow.websocket.ktor.HandshakeFailureDetails org.hildan.krossbow.websocket.ktor.HandshakeExceptionsJvmKt.extractHandshakeFailureDetails(java.lang.Exception) and 1 other context)

[joffrey-bion]

Did you confirm that you don't get this error when not using proguard?

Are you on Android? Note that if you're trying to use the JDK11's HttpClient, this is not available on Android.

[Vikviita]

yes
this error only when
isMinifyEnabled = true
isShrinkResources = true

I am on android
I use

krossbowKtor ={group = "org.hildan.krossbow", name = "krossbow-websocket-ktor", version.ref = "krossbowKtor" }
stompKtor = {group = "org.hildan.krossbow", name = "krossbow-stomp-core" ,version.ref= "krossbowKtor" }

[Vikviita]

in documentation said
that krossbowKtor ={group = "org.hildan.krossbow", name = "krossbow-websocket-ktor", version.ref = "krossbowKtor" }
does not use HttpResponce from jdk11
why proguard thinks that library referenced on it
?

[joffrey-bion]

Just for the record, it is possible that Ktor uses the JDK11 client if you use the Java engine (see Ktor engines). But here I'm assuming you're using the Android or OkHttp engine, right? This should not be the cause, because it's only broken when proguard is enabled.

What might be happening is that Proguard complains because it doesn't understand that my reference to java.net.http.WebSocketHandshakeException is actually safe (I made sure it worked fine). Is there a way to force it to accept it?

[Vikviita]

It will work if use

-dontwarn java.net.http.HttpResponse -dontwarn java.net.http.WebSocketHandshakeException

In Proguard rules

[joffrey-bion]

Ok great! Good to know.

I'm not sure if there is anything I could do here. We need to extract information from these exceptions when they are thrown (and thus exist on the classpath). This code should never throw at runtime even when the exception class is not on the classpath.

Basically, usages of JDK11 stuff will only be used when using the Ktor Java (JDK11) engine.