Failed to find the generated JsonAdapter constructor

Hey guys!

I have this issue Failed to find the generated JsonAdapter constructor on one of my project. If you have a look into build/generated/source/kapt I can’t find the generated Adapters

sample project to reproduce this issue: https://github.com/NodensN/issue-codegen-moshi

Launch test ApiErrorOperatorTest –> https://github.com/NodensN/issue-codegen-moshi/blob/master/core/src/test/java/io/gmas/issuecodegenmoshi/core/ApiErrorOperatorTest.kt

stacktrace:

java.lang.RuntimeException: Failed to find the generated JsonAdapter constructor for class io.gmas.issuecodegenmoshi.core.network.envelopes.ErrorEnvelope

	at com.squareup.moshi.StandardJsonAdapters.generatedAdapter(StandardJsonAdapters.java:252)
	at com.squareup.moshi.StandardJsonAdapters$1.create(StandardJsonAdapters.java:62)
	at com.squareup.moshi.Moshi.adapter(Moshi.java:130)
	at com.squareup.moshi.Moshi.adapter(Moshi.java:64)
	at io.gmas.issuecodegenmoshi.core.libs.rx.operators.ApiErrorOperator$apply$1.onNext(ApiErrorOperator.kt:35)
	at io.gmas.issuecodegenmoshi.core.libs.rx.operators.ApiErrorOperator$apply$1.onNext(ApiErrorOperator.kt:21)
	at io.reactivex.subjects.PublishSubject$PublishDisposable.onNext(PublishSubject.java:311)
	at io.reactivex.subjects.PublishSubject.onNext(PublishSubject.java:231)
	at io.gmas.issuecodegenmoshi.core.ApiErrorOperatorTest.testErrorResponse(ApiErrorOperatorTest.kt:35)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:131)
Caused by: java.lang.NoSuchMethodException: io.gmas.issuecodegenmoshi.core.network.envelopes.ErrorEnvelopeJsonAdapter.<init>(com.squareup.moshi.Moshi, [Ljava.lang.reflect.Type;)
	at java.lang.Class.getConstructor0(Class.java:3082)
	at java.lang.Class.getDeclaredConstructor(Class.java:2178)
	at com.squareup.moshi.StandardJsonAdapters.generatedAdapter(StandardJsonAdapters.java:239)
	... 36 more

any ideas?

Issue Analytics

State:
Created 5 years ago
Reactions:3
Comments:6 (1 by maintainers)

Top GitHub Comments

3reactions

jdegroot-dsscommented, Jun 18, 2020

@PramodGarg I know this is an old issue but I ran into this problem as well on Moshi 1.9.2 and found a solution:

In my case I have a generic class for responses:

@JsonClass(generateAdapter = true)
data class Response<out T>(val data: T? = null, val errors: List<Error> = listOf())

The generated constructor for the JsonAdapter has the signature ResponseJsonAdapter<T>(moshi: Moshi, types: Array<Type>). When Moshi tries to find this adapter it will need to invoke this constructor with both Moshi and the types parameters. In order to do that it needs to know that the Type for the class is parameterized (see the method generatedAdapter).

Suppose the data is of type UserData which has its own generated adapter, when getting the adapter and (de)serialize the object instead of using:

moshi.adapter<Reponse<UserData>>(Response::class.java) // <-- does not know about the parameter `T` in the Reponse

define a new parameterized type and get the adapter using that Type:

val parameterizedType = Types.newParameterizedType(Response::class.java, UserData::class.java)
moshi.adapter<Reponse<UserData>>(parameterizedType)

And you’re all set! Hope this helps someone.

3reactions

okaymakcommented, Oct 4, 2018

I am having similar issue, only with proguard enabled. I am using moshi.adapter(Types.newParameterizedType(List::class.java, MyClass::class.java)). Looks like I am missing a proguard rule, but cannot figure out what is needed. Using moshi.adapter(MyClass::class.java) works ok with proguard when I don’t need a list, but have to use Types.newParameterizedType to get an adapter for a list of items.

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