Illegal field name when trying to compile with a javax.swing.Action

[David Alayachew]

Hello Core Libs Dev Team,

I tried to compile the attached project, and got the following error.

Exception in thread "main" java.lang.ClassFormatError: Illegal field name
"" in class ToDoList$2
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1027)
at
java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
at
java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:862)
at
java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:760)
at
java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:681)
at
java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:639)
at
java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
at ToDoList.main(ToDoList.java:73)

Attached is the zip. StackOverflow was not much help, so I thought I would
reach out here.

Thank you all for your time and help!
David Alayachew
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