Reproducer of raphw/byte-buddy#1732

README.md

@@ -1 +1,22 @@
 # jit-broken-switch-example
+Original discussion in https://github.com/raphw/byte-buddy/issues/1732
+
+ByteBuddy sporadically runs into an "impossible" exception in `net.bytebuddy.dynamic.scaffold.TypeWriter.Default.ValidatingClassVisitor.visitField`.
+This code path can happen just with switch statement skipping all branches including default.
+In general this condition is rare, but running `org.example.App with` `-Xcomp` reliably reproduces this condition on `Java 18-23`.
+
+
+`Exception in thread "main" java.lang.IllegalStateException: Field POOL_NORMAL defines an incompatible default value 0
+at net.bytebuddy.dynamic.scaffold.TypeWriter$Default$ValidatingClassVisitor.visitField(TypeWriter.java:2535)
+at net.bytebuddy.dynamic.scaffold.TypeWriter$Default$ForInlining$WithFullProcessing$RedefinitionClassVisitor.onVisitField(TypeWriter.java:5164)
+at net.bytebuddy.utility.visitor.MetadataAwareClassVisitor.visitField(MetadataAwareClassVisitor.java:278)
+at net.bytebuddy.jar.asm.ClassVisitor.visitField(ClassVisitor.java:356)
+at net.bytebuddy.jar.asm.commons.ClassRemapper.visitField(ClassRemapper.java:169)
+at net.bytebuddy.jar.asm.ClassReader.readField(ClassReader.java:1138)
+at net.bytebuddy.jar.asm.ClassReader.accept(ClassReader.java:740)
+at net.bytebuddy.utility.AsmClassReader$Default.accept(AsmClassReader.java:132)
+at net.bytebuddy.dynamic.scaffold.TypeWriter$Default$ForInlining.create(TypeWriter.java:4039)
+at net.bytebuddy.dynamic.scaffold.TypeWriter$Default.make(TypeWriter.java:2246)
+at net.bytebuddy.dynamic.DynamicType$Builder$AbstractBase$UsingTypeWriter.make(DynamicType.java:4085)
+at net.bytebuddy.dynamic.DynamicType$Builder$AbstractBase.make(DynamicType.java:3769)
+at org.example.App.main(App.java:20)`

settings.gradle

@@ -0,0 +1,14 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ * For more detailed information on multi-project builds, please refer to https://docs.gradle.org/8.11.1/userguide/multi_project_builds.html in the Gradle documentation.
+ */
+
+plugins {
+    // Apply the foojay-resolver plugin to allow automatic download of JDKs
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '0.8.0'
+}
+
+rootProject.name = 'jit-broken-switch-example'
+include('app')