These Exception types were used by the old character encoders/decoders in sun.misc, that have since been removed, see 8144479 [1]. There is no reason to keep these old Exception types.
$ hg rm src/java.base/share/classes/sun/misc/CEFormatException.java $ hg rm src/java.base/share/classes/sun/misc/CEStreamExhausted.java -Chris. [1] https://bugs.openjdk.java.net/browse/JDK-8146771
