[Solved] Convert Map to List with new java 8 streams

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As already mentioned in a comment by the user “soon”, this problem can be easily solved with flatMap and map:

List<TestSession> list = mapList.entrySet().stream()
    .flatMap(e1 -> e1.getValue().stream()
        .map(e2 -> new TestSession(e1.getKey(), e2.getKey(), e2.getValue())))
    .collect(Collectors.toList());

solved Convert Map to List with new java 8 streams