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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"regression in 20.0 on LambdaFetchingSupport , Kotlin data class, Spring boot","articleBody":"I am trying to upgrade the library from 18.0 to 20.0 today and found below regression.\r\n\r\n**Describe the bug**\r\nThe LadmbdaFetchingSupport has a regression that causeS this error:\r\n```\r\njava.lang.ClassCastException: part.to.namespace.Xxx incompatible with part.to.namespace.Xxx\r\n\tat graphql.schema.PropertyFetchingImpl.getPropertyValue(PropertyFetchingImpl.java:76) ~[graphql-java-20.0.jar:na]\r\n\tat graphql.schema.PropertyDataFetcherHelper.getPropertyValue(PropertyDataFetcherHelper.java:22) ~[graphql-java-20.0.jar:na]\r\n\tat graphql.schema.PropertyDataFetcher.getImpl(PropertyDataFetcher.java:131) ~[graphql-java-20.0.jar:na]\r\n```\r\n\r\n**To Reproduce**\r\nEnvironment: Java 17, Kotlin 1.8.0,\r\nlast known good library version: 19.3\r\n\r\n```java\r\n// This works\r\nobject.getClass().getDeclaredMethods()[0].invoke(object)\r\n// This doesn't work\r\nLambdaFetchingSupport.createGetter(object.getClass(), \"id\").get().apply(object)\r\n```\r\n\r\nI wasn't able to re-produce the error with the exact same class in Junit environement. \r\nTwo different things maybe related when I check the `object.getClass()`\r\n\r\nIn Junit, the class loader is ClassLoaders$AppClassLoader\r\nIn application , it is RestartClassLoader from Spring.\r\n\r\n```\r\n// This work\r\nProtectionDomain  (file:/C:/dev/asterisk/app/build/classes/kotlin/main/ \u003cno signer certificates\u003e)\r\n jdk.internal.loader.ClassLoaders$AppClassLoader@2089d901\r\n \u003cno principals\u003e\r\n java.security.Permissions@fe1776a3 (\r\n (\"java.io.FilePermission\" \"C:\\dev\\asterisk\\app\\build\\classes\\kotlin\\main\\-\" \"read\")\r\n (\"java.lang.RuntimePermission\" \"exitVM\")\r\n)\r\n// This doesn't work\r\nProtectionDomain  (file:/C:/dev/asterisk/app/build/classes/kotlin/main/ \u003cno signer certificates\u003e)\r\n org.springframework.boot.devtools.restart.classloader.RestartClassLoader@d8afcbba\r\n \u003cno principals\u003e\r\n java.security.Permissions@f41df67b (\r\n (\"java.net.SocketPermission\" \"localhost:0\" \"listen,resolve\")\r\n (\"java.lang.RuntimePermission\" \"accessClassInPackage.com.sun.beans.*\")\r\n (\"java.lang.RuntimePermission\" \"accessClassInPackage.com.apple.*\")\r\n (\"java.lang.RuntimePermission\" \"accessClassInPackage.com.sun.java.swing.plaf.*\")\r\n (\"java.lang.RuntimePermission\" \"accessClassInPackage.com.sun.beans\")\r\n (\"java.util.PropertyPermission\" \"java.specification.version\" \"read\")\r\n (\"java.util.PropertyPermission\" \"java.vm.vendor\" \"read\")\r\n (\"java.util.PropertyPermission\" \"path.separator\" \"read\")\r\n (\"java.util.PropertyPermission\" \"os.version\" \"read\")\r\n (\"java.util.PropertyPermission\" \"java.vendor.url\" \"read\")\r\n (\"java.util.PropertyPermission\" \"java.vm.name\" \"read\")\r\n (\"java.util.PropertyPermission\" \"java.vm.specification.version\" \"read\")\r\n (\"java.util.PropertyPermission\" \"os.name\" \"read\")\r\n (\"java.util.PropertyPermission\" \"java.version\" \"read\")\r\n (\"java.util.PropertyPermission\" \"os.arch\" \"read\")\r\n (\"java.util.PropertyPermission\" \"java.specification.vendor\" \"read\")\r\n (\"java.util.PropertyPermission\" \"java.vm.specification.name\" \"read\")\r\n (\"java.util.PropertyPermission\" \"file.separator\" \"read\")\r\n (\"java.util.PropertyPermission\" \"line.separator\" \"read\")\r\n (\"java.util.PropertyPermission\" \"java.vm.specification.vendor\" \"read\")\r\n (\"java.util.PropertyPermission\" \"java.specification.name\" \"read\")\r\n (\"java.util.PropertyPermission\" \"java.vendor\" \"read\")\r\n (\"java.util.PropertyPermission\" \"java.vm.version\" \"read\")\r\n (\"java.util.PropertyPermission\" \"java.class.version\" \"read\")\r\n (\"java.io.FilePermission\" \"C:\\dev\\asterisk\\app\\build\\classes\\kotlin\\main\\-\" \"read\")\r\n (\"java.io.FilePermission\" \"C:\\dev\\asterisk\\app\\build\\classes\\kotlin\\main\\-#plus\" \"read\")\r\n)\r\n```\r\n\r\n","author":{"url":"https://github.com/ntf","@type":"Person","name":"ntf"},"datePublished":"2023-03-16T17:55:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/3121/graphql-java/issues/3121"}