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I remembered that yesterday this code runs ok with no match user. But today it fails suddenly. As you can see, The code is the same with the Room findById. If no element, the room will become null and continue to work. For user, I got the NoSuchElementException. Why? Panache.withSession(() ->
Room.<Room>findById(roomId).onItem().invoke(room -> {
if (room == null) {
try {
sharedLogger.getLogger().infof("Room %s doesn't exist", roomId);
session.close();
} catch (IOException e) {
sharedLogger.getLogger().error("Failed to close session", e);
}
return;
} else {
LiveManager.ROOM_MAP.put(roomId, new LiveRoom(sharedLogger.getLogger(), room));
}
UUID uuid = UUID.fromString(id);
User.<User>findById(uuid).onItem().invoke(user -> {
if (user == null) {
System.out.println("null");
} else {
System.out.println(user);
}
}).subscribe().with(r -> {
});
// LiveManager.onClientLogin(roomId, id, name, session, sharedLogger.getLogger());
})).subscribe().with(r -> {
}); |
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Replies: 2 comments 7 replies
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/cc @FroMage (panache), @loicmathieu (panache) |
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OK, chain the Uni. Problem solved. |
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thanks for the answer, I have been reading about these since yesterday but could not find a good doc yet, can you suggest a good page how to use uni with hibernate properyly or good example code in girhub too ? the coede I am dealing with has 4 parallel query on DB with Uni and trying to merge them after and map them to a value object, in first request it is working but in second and further "NoSuchElementException" coming :) |
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If you have 4 uni, you can use |
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And if you have unis with random size you can use this. And then use temp as result uni. Uni<?> temp = Uni.createFrom().voidItem();
for (Uni<?> uni : xxx) {
temp = temp.replaceWith(uni);
} |
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are there any page/website you can suggest for learning uni with hibernate reactive ? |
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https://smallrye.io/smallrye-mutiny/ |
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OK, chain the Uni. Problem solved.