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I found a scenario that uses com.sun.jndi.toolkit.UrlUtil class in a source cods. I can find this class in rt.jar in Standard Java Distribution. But I cannot find any API documentation for classes in this package. Why these classes are hidden? Are there any drawbacks in using those classes in my code?
Because
com.sun.*is not an API. It’s Sun’s implementation. You shouldn’t rely on these classes, because they are likely to change.