UNKNOWN (Java SE 9 & JDK 9 )

java.lang.Object
- java.lang.Throwable
- - java.lang.Exception
  - - java.lang.RuntimeException
    - - org.omg.CORBA.SystemException
      - org.omg.CORBA.UNKNOWN

All Implemented Interfaces:

Serializable
```
public final class UNKNOWN
extends SystemException
```
This exception is raised if an operation implementation throws a non-CORBA exception (such as an exception specific to the implementation's programming language), or if an operation raises a user exception that does not appear in the operation's raises expression. UNKNOWN is also raised if the server returns a system exception that is unknown to the client. (This can happen if the server uses a later version of CORBA than the client and new system exceptions have been added to the later version.)
It contains a minor code, which gives more detailed information about what caused the exception, and a completion status. It may also contain a string describing the exception.
See the section Minor Code Meaning to see the minor codes for this exception.
See also documentation on Java IDL exceptions.

Field Summary
- Fields inherited from class org.omg.CORBA.SystemException
  completed, minor

Constructor Summary

Constructors
Constructor	Description
`UNKNOWN()`	Constructs an `UNKNOWN` exception with a default minor code of 0, a completion state of CompletionStatus.COMPLETED_NO, and a null description.
`UNKNOWN(int minor, CompletionStatus completed)`	Constructs an `UNKNOWN` exception with the specified minor code and completion status.
`UNKNOWN(String s)`	Constructs an `UNKNOWN` exception with the specified description message, a minor code of 0, and a completion state of COMPLETED_NO.
`UNKNOWN(String s, int minor, CompletionStatus completed)`	Constructs an `UNKNOWN` exception with the specified description message, minor code, and completion status.

Method Summary
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
- Methods inherited from class org.omg.CORBA.SystemException
  toString
- Methods inherited from class java.lang.Throwable
  addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace

- Constructor Detail
  - UNKNOWN
```
public UNKNOWN()
```
    Constructs an UNKNOWN exception with a default minor code of 0, a completion state of CompletionStatus.COMPLETED_NO, and a null description.
  - UNKNOWN
```
public UNKNOWN(String s)
```
    Constructs an UNKNOWN exception with the specified description message, a minor code of 0, and a completion state of COMPLETED_NO.
    
    Parameters:
    
    s - the String containing a detail message
  - UNKNOWN
```
public UNKNOWN(int minor,
               CompletionStatus completed)
```
    Constructs an UNKNOWN exception with the specified minor code and completion status.
    
    Parameters:
    
    minor - the minor code
    
    completed - the completion status
  - UNKNOWN
```
public UNKNOWN(String s,
               int minor,
               CompletionStatus completed)
```
    Constructs an UNKNOWN exception with the specified description message, minor code, and completion status.
    
    Parameters:
    
    s - the String containing a description message
    
    minor - the minor code
    
    completed - the completion status