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    Type:Bug 
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    Resolution: Fixed
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    Priority:Normal 
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    Affects Version/s: 5.9.0
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    Component/s: None
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    None
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        None
Steps to Reproduce
run test case is.keikai.serialization.serializeSpreadsheet()
Current Result
java.io.NotSerializableException: io.keikai.model.impl.WorkbookProtectionImpl
	at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1185)
...
Expected Result
no error
Debug Information
- WorkbookProtectionImpl is a new class since 5.8.0