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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ClassNotFoundException on lambda expression inside the method","articleBody":"**Description**\r\n\r\nClassNotFoundException is thrown on concrete execution of a method with lambda expression producing an anonymous class inside.\r\n\r\n**To Reproduce**\r\n\r\n1. Run a project in IntelliJ Idea 2022.1.4 with one of the latest plugin builds from main branch \r\n2. Add the following code:\r\n\r\n```java\r\npublic class A {\r\n\r\n    public interface Driver {\r\n        public int getNumber(int n);\r\n    }\r\n\r\n    public Driver getDriver() {\r\n        return n -\u003e 2 * n - 1 ;\r\n    }\r\n}\r\n```\r\n3. Use plugin to generate tests for getDriver() method.\r\n4. Open the generated test\r\n\r\n**Expected behavior**\r\n\r\nTests are supposed to be generated without errors.\r\n\r\n**Actual behavior**\r\n\r\nThere is an error test with concrete execution failed.\r\n\r\n**Visual proofs (screenshots, logs, images)**\r\n\r\n~~~java\r\n    ///region Errors report for getDriver\r\n\r\n    public void testGetDriver_errors() {\r\n        // Couldn't generate some tests. List of errors:\r\n        // \r\n        // 1 occurrences of:\r\n        // Default concrete execution failed\r\n\r\n    }\r\n    ///endregion\r\n~~~\r\n\r\n\u003cdetails\u003e\r\n\u003csummary\u003eConcrete execution log - expand for details\u003c/summary\u003e\r\n16:44:01.974 ERROR| java.lang.ClassNotFoundException: A$$Lambda$15/993989412\r\n\tat java.net.URLClassLoader.findClass(URLClassLoader.java:387)\r\n\tat java.lang.ClassLoader.loadClass(ClassLoader.java:418)\r\n\tat org.utbot.instrumentation.process.HandlerClassesLoader.loadClass(ChildProcess.kt:63)\r\n\tat java.lang.ClassLoader.loadClass(ClassLoader.java:351)\r\n\tat org.utbot.framework.plugin.api.util.IdUtilKt.getJClass(IdUtil.kt:100)\r\n\tat org.utbot.framework.concrete.UtAssembleModelConstructorsKt.findUtAssembleModelConstructor(UtAssembleModelConstructors.kt:91)\r\n\tat org.utbot.framework.concrete.UtModelConstructor.tryConstructUtAssembleModel(UtModelConstructor.kt:256)\r\n\tat org.utbot.framework.concrete.UtModelConstructor.constructFromAny(UtModelConstructor.kt:247)\r\n\tat org.utbot.framework.concrete.UtModelConstructor.construct(UtModelConstructor.kt:114)\r\n\tat org.utbot.framework.concrete.UtExecutionInstrumentation$invoke$1$1$concreteExecutionResult$1.invoke(UtExecutionInstrumentation.kt:197)\r\n\tat org.utbot.framework.concrete.UtExecutionInstrumentation$invoke$1$1$concreteExecutionResult$1.invoke(UtExecutionInstrumentation.kt:176)\r\n\tat org.utbot.framework.concrete.UtExecutionInstrumentation.withStaticFields(UtExecutionInstrumentation.kt:313)\r\n\tat org.utbot.framework.concrete.UtExecutionInstrumentation.invoke(UtExecutionInstrumentation.kt:176)\r\n\tat org.utbot.framework.concrete.UtExecutionInstrumentation.invoke(UtExecutionInstrumentation.kt:118)\r\n\tat org.utbot.instrumentation.process.ChildProcessKt$setup$2.invoke(ChildProcess.kt:211)\r\n\tat org.utbot.instrumentation.process.ChildProcessKt$setup$2.invoke(ChildProcess.kt:208)\r\n\tat org.utbot.instrumentation.process.ChildProcessKt$measureExecutionForTermination$2$1$1.invoke(ChildProcess.kt:190)\r\n\tat org.utbot.instrumentation.process.ChildProcessKt$measureExecutionForTermination$1.invokeSuspend(ChildProcess.kt:174)\r\n\tat kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)\r\n\tat kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)\r\n\tat kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.common.kt:284)\r\n\tat kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:85)\r\n\tat kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:59)\r\n\tat kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)\r\n\tat kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:38)\r\n\tat kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)\r\n\tat org.utbot.instrumentation.process.ChildProcessKt.measureExecutionForTermination(ChildProcess.kt:171)\r\n\tat org.utbot.instrumentation.process.ChildProcessKt.access$measureExecutionForTermination(ChildProcess.kt:1)\r\n\tat org.utbot.instrumentation.process.ChildProcessKt$measureExecutionForTermination$2$1.invokeSuspend(ChildProcess.kt:188)\r\n\tat kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)\r\n\tat kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)\r\n\tat kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.common.kt:284)\r\n\tat kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:85)\r\n\tat kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:59)\r\n\tat kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)\r\n\tat kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:38)\r\n\tat kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)\r\n\tat org.utbot.instrumentation.process.ChildProcessKt$measureExecutionForTermination$2.invoke(ChildProcess.kt:187)\r\n\tat com.jetbrains.rd.framework.IRdEndpoint$set$1.invoke(TaskInterfaces.kt:182)\r\n\tat com.jetbrains.rd.framework.IRdEndpoint$set$1.invoke(TaskInterfaces.kt:182)\r\n\tat com.jetbrains.rd.framework.impl.RdCall.onWireReceived(RdTask.kt:360)\r\n\tat com.jetbrains.rd.framework.MessageBroker$invoke$2$2.invoke(MessageBroker.kt:57)\r\n\tat com.jetbrains.rd.framework.MessageBroker$invoke$2$2.invoke(MessageBroker.kt:56)\r\n\tat com.jetbrains.rd.framework.impl.ProtocolContexts.readMessageContextAndInvoke(ProtocolContexts.kt:148)\r\n\tat com.jetbrains.rd.framework.MessageBroker$invoke$2.invoke(MessageBroker.kt:56)\r\n\tat com.jetbrains.rd.framework.MessageBroker$invoke$2.invoke(MessageBroker.kt:54)\r\n\tat com.jetbrains.rd.util.threading.SingleThreadSchedulerBase.queue$lambda-3(SingleThreadScheduler.kt:41)\r\n\tat java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)\r\n\tat java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)\r\n\tat java.lang.Thread.run(Thread.java:750)\r\n\r\n\u003c/details\u003e\r\n\r\n\r\n**Environment**\r\n\r\nWindows 10 Pro\r\nJDK 8\r\n","author":{"url":"https://github.com/alisevych","@type":"Person","name":"alisevych"},"datePublished":"2022-09-29T14:06:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/1035/UTBotJava/issues/1035"}