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Is there any way I can combine a list of throwables? I have a list of ListenableFutures, each of which will capture exception (if any) and keep it in a Result instance. Finally, I want to throw an exception if any of the Result of the ListenableFutures contains a throwable. The issue is how to combine multiple throwables, because there could be multiple futures that fail?
List<ListenableFuture<Result>> futureList = new ArrayList<>();
futureList.add(future1);
futureList.add(future2);
futureList.add(future3);
ListenableFuture<List<Result>> future = futureFutures.successfulAsList(futureList);
return Futures.transform(future, new Function<List<Result>, FinalResult>() {
@Override
public FinalResult apply(List<Result> resultList) {
List<Throwable> throwableList = new ArrayList<>();
for (Result result : resultList) {
if (result.getThrowable() != null) {
throwableList.add(result.getThowable());
}
}
if (!throwableList.isEmpty()) {
// Is there something like below that I can combine a list
// of throwables and throw it?
Throwable.propagateList(throwableList); // ?????????
}
.....
return finalResult;
}
},
MoreExecutors.sameThreadExecutor());
447
Java Catch Multiple Exceptions A try block can be followed by one or more catch blocks. Each catch block must contain a different exception handler. So, if you have to perform different tasks at the occurrence of different exceptions, use java multi-catch block.
By handling multiple exceptions, a program can respond to different exceptions without terminating it. In Python, try-except blocks can be used to catch and respond to one or multiple exceptions. In cases where a process raises more than one possible exception, they can all be handled using a single except clause.
Java allows you to catch multiple type exceptions in a single catch block. It was introduced in Java 7 and helps to optimize code. You can use vertical bar (|) to separate multiple exceptions in catch block.
You can't throw two exceptions. I.e. you can't do something like: try { throw new IllegalArgumentException(), new NullPointerException(); } catch (IllegalArgumentException iae) { // ... } catch (NullPointerException npe) { // ... }
There is no exception that means "multiple things went wrong", but there's nothing stopping you from creating one. Exceptions are just objects, and they can have members, including something like List<Throwable> getCauses().
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