Object cannot be cast to class retrofit2.ServiceMethod

[swankjesse]

I ran into this with Retrofit 2.10.

java.lang.ClassCastException: class java.lang.Object cannot be cast to class retrofit2.ServiceMethod (java.lang.Object is in module java.base of loader 'bootstrap'; retrofit2.ServiceMethod is in unnamed module of loader 'app')
	at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:246)
	at retrofit2.Retrofit$1.invoke(Retrofit.java:177)
	at jdk.proxy3/jdk.proxy3.$Proxy139.addPullRequestLabel(Unknown Source)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at misk.client.ClientInvocationHandler.invoke(ClientInvocationHandler.kt:125)
	at jdk.proxy3/jdk.proxy3.$Proxy139.addPullRequestLabel(Unknown Source)
	at com.squareup.cash.treelot.github.PullRequestMaker.addLabels(PullRequestMaker.kt:237)

[swankjesse]

I had misconfigured my method, but rather than a helpful error message I got a Retrofit internal crash. I think we need to make loadServiceMethod handle the case where parseAnnotations throws.

[JakeSteam]

Error message is seemingly fixed in later versions, but in case anyone gets the same problem: The issue is probably in your API definition.

For me I had (simplified, notice the missing }):

@GET("/myapi/{value1}/{value2/{value3}")
    suspend fun myApiCall(
        @Path("value1") value1: String,
        @Path("value2") value2: String,
        @Path("value3") value3: String
    ): Response<MyResponse>