mutual dependent class not working #65

[andrus]

@stariy95 , I was able to address a part of the issue - avoiding failures in the declaration snippet. However an attempt to instantiate one of the declared classes in the following cell still throws. So we need to dig a bit deeper.

new Animal();

java.lang.RuntimeException: java.lang.NoClassDefFoundError, REPL[/](http://localhost:8888/)$JShell$13$Animal
	at org.dflib.jjava.execution.CodeEvaluator.evalSingle(CodeEvaluator.java:144)
	at org.dflib.jjava.execution.CodeEvaluator.eval(CodeEvaluator.java:176)
	at org.dflib.jjava.JavaKernel.evalRaw(JavaKernel.java:337)
	at org.dflib.jjava.JavaKernel.eval(JavaKernel.java:342)
	at org.dflib.jjava.jupyter.kernel.BaseKernel.handleExecuteRequest(BaseKernel.java:383)
	at org.dflib.jjava.jupyter.channels.ShellChannel.lambda$bind$0(ShellChannel.java:64)
	at org.dflib.jjava.jupyter.channels.Loop.lambda$new$0(Loop.java:21)
	at org.dflib.jjava.jupyter.channels.Loop.run(Loop.java:78)
Caused by: jdk.jshell.EvalException: REPL[/](http://localhost:8888/)$JShell$13$Animal
	at .(#31:1)