English Learning:One of Exception when debuging

Hot Code Replace Failed
Some code changes cannot be hot swapped into a running virtual machine,
such as changing method names or introducing errors into running code.

The current target virtual machine [cn.ncx.wrapperdass.lntegerClass at localhost:51716] from launch [IntegerClass] was unable to replace the running code with the code in the workspace.

It is safe to continue running the application, but you may notice discrepancies when debugging this application.

Reason:
Hot code replace failed - Scheme change not implemented
Do not show error when hot code replace fails
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