UnsupportedTemporalTypeException when formatting Instant to String

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I’m trying to format an Instant to a String using the new Java 8 Date and Time API and the following pattern:

Instant instant = ...;
String out = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").format(instant);

Using the code above I get an exception which complains about an unsupported field:

java.time.temporal.UnsupportedTemporalTypeException: Unsupported field: YearOfEra
    at java.time.Instant.getLong(Instant.java:608)
    at java.time.format.DateTimePrintContext.getValue(DateTimePrintContext.java:298)
    ...

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