Hi,

I get runtime errors when I try to use 
the com.google.protobuf:protobuf-java-util to convert a long to a Timestamp.

I believe the issue is that the protobuf-java-util does not support kotlin

Here's the stacktrace, followed by my build.gradle.kts for the project

    'com.google.protobuf.Timestamp 
com.google.protobuf.Timestamp$Builder.build()'
java.lang.NoSuchMethodError: 'com.google.protobuf.Timestamp 
com.google.protobuf.Timestamp$Builder.build()'
    at com.google.protobuf.util.Timestamps.<clinit>(Timestamps.java:73)
    at nhc.protobuf.util.TimestampsKtKt.toProtoTimestamp(TimestampsKt.kt:7)
    at 
nhc.protobuf.util.TimestampsKtTest.toTimestamp(TimestampsKtTest.kt:16)
    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 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
    at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
    at 
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at 
org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
    at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
    at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
    at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
    at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
    at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
    at 
org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:108)
    at 
org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
    at 
org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:40)
    at 
org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:60)
    at 
org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:52)
    at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method)
    at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at 
org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
    at 
org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at 
org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
    at 
org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
    at jdk.proxy1/jdk.proxy1.$Proxy2.processTestClass(Unknown Source)
    at 
org.gradle.api.internal.tasks.testing.worker.TestWorker$2.run(TestWorker.java:176)
    at 
org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129)
    at 
org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100)
    at 
org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60)
    at 
org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
    at 
org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:113)
    at 
org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:65)
    at 
worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
    at 
worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)


Could not initialize class com.google.protobuf.util.Timestamps
java.lang.NoClassDefFoundError: Could not initialize class 
com.google.protobuf.util.Timestamps
    at 
nhc.protobuf.util.TimestampsKtKt.toMillisTimestamp(TimestampsKt.kt:11)
    at 
nhc.protobuf.util.TimestampsKtTest.toMillisTimestamp(TimestampsKtTest.kt:26)
    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 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
    at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
    at 
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at 
org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
    at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
    at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
    at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
    at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
    at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
    at 
org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:108)
    at 
org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
    at 
org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:40)
    at 
org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:60)
    at 
org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:52)
    at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method)
    at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at 
org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
    at 
org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at 
org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
    at 
org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
    at jdk.proxy1/jdk.proxy1.$Proxy2.processTestClass(Unknown Source)
    at 
org.gradle.api.internal.tasks.testing.worker.TestWorker$2.run(TestWorker.java:176)
    at 
org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129)
    at 
org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100)
    at 
org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60)
    at 
org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
    at 
org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:113)
    at 
org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:65)
    at 
worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
    at 
worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)


My project is configured like this:


   import com.google.protobuf.gradle.id
    
    plugins {
        id("java-library")
        id("org.jetbrains.kotlin.jvm") version "1.8.10"
        id("com.google.protobuf") version "0.9.1"
    }

    java {
        sourceCompatibility = JavaVersion.VERSION_17
        targetCompatibility = JavaVersion.VERSION_17
    }

    kotlin {
        jvmToolchain(17)
    }

    tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
        kotlinOptions.jvmTarget = "17"
    }

    protobuf {
        protoc {
            artifact = "com.google.protobuf:protoc:3.21.9"
        }

        // Generates the java Protobuf-lite code for the Protobufs in this 
project. See
        // 
https://github.com/google/protobuf-gradle-plugin#customizing-protobuf-compilation
        // for more information.
        generateProtoTasks {
            // see 
https://github.com/google/protobuf-gradle-plugin/issues/518
            // see 
https://github.com/google/protobuf-gradle-plugin/issues/491
            ofSourceSet("main").forEach { task ->
                task.builtins {
                    getByName("java") {
                        option("lite")
                    }
                    id("kotlin") {
                        option("lite")
                    }
                }
            }
        }
    }

    dependencies {
        api("com.google.protobuf:protobuf-javalite:3.21.9")
        api("com.google.protobuf:protobuf-kotlin-lite:3.21.9")
        api("com.google.protobuf:protobuf-java-util:3.21.9")
    }

Should I open a bug or a feature request 
on https://github.com/protocolbuffers/protobuf/issues/ ?

Thanks in advance,
Daniele

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