ClassNotFoundException after upgrading okhttp to 5.3.2

[hibell]

We are seeing a ClassNotFoundException after upgrading okhttp from 4.12.0 to 5.3.2. As v4 hasn't had a release since 2023/10, we'd like to upgrade to v5. The CNFE looks to happen because the IBM Cloud Java SDK is using an internal okhttp class that was removed in v5.

java.lang.NoClassDefFoundError: okhttp3.internal.Util
    at com.ibm.cloud.sdk.core.http.InputStreamRequestBody.writeTo(InputStreamRequestBody.java:101)
    at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.kt:66)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:126)
    at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.kt:34)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:126)
    at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.kt:101)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:126)
    at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.kt:85)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:126)
    at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.kt:74)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:126)
    at com.ibm.cloud.sdk.core.http.RetryInterceptor.intercept(RetryInterceptor.java:103)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:126)
    at okhttp3.internal.connection.RealCall.getResponseWithInterceptorChain$okhttp(RealCall.kt:226)
    at okhttp3.internal.connection.RealCall.execute(RealCall.kt:178)
    at com.ibm.cloud.sdk.core.service.BaseService$IBMCloudSDKServiceCall.execute(BaseService.java:601)
    ...internal classes omitted...
    at java.base\/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
    at java.base\/java.lang.reflect.Method.invoke(Unknown Source)
    at org.jboss.weld.injection.StaticMethodInjectionPoint.invoke(StaticMethodInjectionPoint.java:95)
    at org.jboss.weld.injection.StaticMethodInjectionPoint.invoke(StaticMethodInjectionPoint.java:85)
    at org.jboss.weld.injection.MethodInvocationStrategy$DefaultMethodInvocationStrategy.invoke(MethodInvocationStrategy.java:144)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:330)
    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:308)
    at org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:286)
    at jakarta.enterprise.inject.spi.ObserverMethod.notify(ObserverMethod.java:142)
    at org.jboss.weld.util.Observers.notify(Observers.java:166)
    at org.jboss.weld.event.ObserverNotifier.notifyAsyncObserver(ObserverNotifier.java:415)
    at org.jboss.weld.event.ObserverNotifier.lambda$notifyAsyncObservers$5(ObserverNotifier.java:358)
    at org.jboss.weld.event.ObserverNotifier.lambda$createSupplier$8(ObserverNotifier.java:442)
    at org.jboss.weld.security.spi.SecurityServices.lambda$getSecurityContextAssociator$0(SecurityServices.java:80)
    at org.jboss.weld.event.ObserverNotifier.lambda$createSupplier$9(ObserverNotifier.java:438)
    at java.base\/java.util.concurrent.CompletableFuture$AsyncSupply.run(Unknown Source)
    at com.ibm.ws.threading.internal.PolicyTaskFutureImpl.run(PolicyTaskFutureImpl.java:762)
    at com.ibm.ws.threading.internal.PolicyExecutorImpl.runTask(PolicyExecutorImpl.java:1341)
    at com.ibm.ws.threading.internal.PolicyExecutorImpl$AsyncTask.run(PolicyExecutorImpl.java:220)
    at java.base\/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.base\/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.base\/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: okhttp3.internal.Util
    at com.ibm.ws.classloading.internal.AppClassLoader.findClassCommonLibraryClassLoaders(AppClassLoader.java:786)
    at com.ibm.ws.classloading.internal.AppClassLoader.findClass(AppClassLoader.java:384)
    at com.ibm.ws.classloading.internal.AppClassLoader.findOrDelegateLoadClass(AppClassLoader.java:726)
    at com.ibm.ws.classloading.internal.AppClassLoader.loadClass(AppClassLoader.java:618)
    at com.ibm.ws.classloading.internal.AppClassLoader.loadClass(AppClassLoader.java:587)
    at java.base\/java.lang.ClassLoader.loadClass(Unknown Source)
    ... 42 more