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Posted to notifications@groovy.apache.org by "Szymon Stępniak (Jira)" <ji...@apache.org> on 2022/04/04 11:27:00 UTC
[jira] [Created] (GROOVY-10565) JDK 17: Sealed classes inside a package cause Exception in thread "main" java.lang.ClassFormatError: Illegal class name
Szymon Stępniak created GROOVY-10565:
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Summary: JDK 17: Sealed classes inside a package cause Exception in thread "main" java.lang.ClassFormatError: Illegal class name
Key: GROOVY-10565
URL: https://issues.apache.org/jira/browse/GROOVY-10565
Project: Groovy
Issue Type: Bug
Affects Versions: 4.0.1, 4.0.0
Reporter: Szymon Stępniak
I have found an issue with using sealed types that are inside a package. I took the example from the Groovy 4 release notes and I run it successfully - all classes in this example use the default package. However, when I took the same code and I put it in any package (e.g. `example` package), the execution started failing with:
{code:bash}
Exception in thread "main" java.lang.ClassFormatError: Illegal class name "example.Empty" in class file example/Tree
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1012)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:862)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:760)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:681)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:639)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1012)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:862)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:760)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:681)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:639)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
at example.notworking.run(notworking.groovy:20)
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.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:343)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:328)
at groovy.lang.MetaClassImpl.doInvokeMethod(MetaClassImpl.java:1369)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1103)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1009)
at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:610)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:593)
at org.codehaus.groovy.runtime.InvokerHelper.runScript(InvokerHelper.java:413)
at org.codehaus.groovy.runtime.InvokerHelper$runScript.callStatic(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallStatic(CallSiteArray.java:54)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:217)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:240)
at example.notworking.main(notworking.groovy)
{code}
Here is the code that produces this error:
{code:groovy}
package example
import groovy.transform.Canonical
sealed interface Tree<T> {}
@Singleton final class Empty implements Tree {
String toString() { 'Empty' }
}
@Canonical final class Node<T> implements Tree<T> {
T value
Tree<T> left, right
String toString() {
"Node($value, $left, $right)"
}
}
Tree<Integer> tree = new Node<Integer>(42, new Node<>(0, Empty.instance, Empty.instance), Empty.instance)
assert tree.toString() == 'Node(42, Node(0, Empty, Empty), Empty)'
println "IT WORKS!"
{code}
One important note: this error shows up when I use Java 17. If I run the same code with Java 8 or Java 11, all works fine.
I created an exemplary Gradle project that reproduces this issue - https://github.com/wololock/groovy-4-sealed-issue
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