Details zu den Änderungen unter http://www.gwtproject.org/release-notes.html. Toll ist die Unterstützung von Java 8.

• Started using ES6 Maps when available for HashMap/HashSet that yields up 3x performance improvements.
• Partial support for Java 8 standard library APIs (see below for full list).
• Source level set to Java 8.
• Static and default methods in interfaces aren’t visible to generators. If you want to take advantage of those Java-8isms, you’re encouraged to switch to an annotation processor. This could break existing build if an interface is changed to turn a non-default method into a default method.

• Emulate java.io.UncheckedIOException.
• Emulate Optional<T> and its int, long, double variants.
• Emulate Objects.requireNonNull() with message Supplier.
• Fix Math.min/max(float/double) emulation behavior.
• Emulate Character.isBmpCodePoint().
• Emulate CharSequence.chars().
• Emulate java.lang.SecurityException.
• Emulate Java 8 API of
• java.util.Arrays,
• java.util.ArrayDeque,
• java.math.BigInteger,
• java.util.BitSet,
• java.util.Comparator,
• java.util.function,
• java.util.Iterator,
• java.lang.Iterable,
• java.util.IntSummaryStatistics/LongSummaryStatistics/DoubleSummaryStatistics
• java.util.Collection/Lists/Queues,
• java.util.Map,
• java.util.logging.Logger,
• java.util.PrimitiveIterator,
• java.util.Spliterator,
• java.util.stream,
• java.util.StringJoiner

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