kotlin/TypeCastException when trying to create OkHttpClient object

Question

When i try to create a new OkHttpClient object an Exception get thrown

I'm using OkHttp 3.11.0 and OkIO 2.0.0-RC1.

Exception in thread "main" java.lang.NoClassDefFoundError: kotlin/TypeCastException at okhttp3.ResponseBody.create(ResponseBody.java:210) at okhttp3.internal.Util.(Util.java:60) at okhttp3.OkHttpClient.(OkHttpClient.java:123) at p12.Main.main(Main.java:8) Caused by: java.lang.ClassNotFoundException: kotlin.TypeCastException at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 4 more

Can you provide the code where it goes wrong? – Yoruba Jul 27 '18 at 18:13 — Yoruba, Jul 27 '18 at 18:13

score 14 · Accepted Answer · answered Jul 28 '18 at 00:50

14

Did you add the kotlin stdlib and stdlib-common dependencies to your build? Looks like they're absent.

answered Jul 28 '18 at 00:50

Jesse Wilson

39,078
8
121
128

score 8 · Answer 2 · answered Oct 29 '19 at 16:39

The solution that worked for me (which is mentioned in this github comment) is to add okhttp library itself:

Gradle kotlin DSL:

testImplementation("com.squareup.okhttp3:okhttp:4.2.2")
testImplementation("com.squareup.okhttp3:mockwebserver:4.2.2")

Gradle Groovy DSL:

testImplementation 'com.squareup.okhttp3:okhttp:4.2.2'
testImplementation 'com.squareup.okhttp3:mockwebserver:4.2.2'

score 5 · Answer 3 · answered Aug 01 '18 at 14:43

5

I had the same problem. Add kotlin-stdlib JAR to the build Path

answered Aug 01 '18 at 14:43

Houria

71
7

In case someone hopes to use it by adding a dependency in their `build.gradle` file, this link may be of help. https://mvnrepository.com/artifact/org.jetbrains.kotlin/kotlin-stdlib – Zephaniah Irvine Mar 29 '22 at 19:21

Serhii Povísenko · Answer 4 · 2020-02-07T21:30:42.657

4

It is likely that your project includes the version of okhttp as version 3.x.x, causing the mockwebserver to depend on the wrong version of okhttp which also does not yet contains the transitive dependency on kotlin-stdlib-common.

If you are using Spring Boot along with mockwebserver just add the following property to your pom

<okhttp3.version>4.x.x</okhttp3.version>

edited Feb 07 '20 at 21:30

answered Nov 13 '19 at 14:46

Serhii Povísenko

3,352
1
30
48

score 1 · Answer 5 · answered Apr 22 '21 at 14:48

1

Well, I had the same problem and I added the Kotlin dependency like this:

<dependency>
   <groupId>org.jetbrains.kotlin</groupId>
   <artifactId>kotlin-stdlib</artifactId>
   <version>1.4.32</version>
</dependency>

answered Apr 22 '21 at 14:48

Leonardo Pachon Bolivar

11
1

score 0 · Answer 6 · answered Feb 05 '20 at 06:15

0

In OSGi do not use the kotlin libraries, but the kotlin bundle: https://kotlinlang.org/docs/reference/kotlin-osgi.html

answered Feb 05 '20 at 06:15

dschulten

2,994
1
27
44

kotlin/TypeCastException when trying to create OkHttpClient object

6 Answers6

Linked