Questions tagged [java-8]

Use this tag for questions specific to Java 8 which is version 8 (internal number 1.8) of the Java platform, released on 18 March 2014. In most cases you should also specify the java tag.

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error upon upgrading to tomcat 8 SEVERE: Servlet.service() for servlet jsp threw exception

having trouble in running my upgraded project from tomcat7 to tomcat7/java7 to java8. Im having these errorjava.lang.LinkageError: loader constraint violation: when resolving method "org.apache....
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2answers
43 views

Is use of AtomicInteger for indexing in Stream a legit way?

I would like to get an answer pointing out the reasons why the following idea described below on a very simple example is commonly considered bad and know its weaknesses.I have a sentence of words ...
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votes
1answer
33 views

Is it possible to return map response from Functional interface in java

In the below code,I would like to return map from Functional interface.But I am getting error from the below code. Thanks in Advance.Function< Employee, Map< String, Integer > > ...
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0answers
6 views

Spark Streaming for CompletableFuture

It is possible to do Streaming, from Spark Streaming , on CompletableFuture's processing, for example, we have 3 CompletableFuture as bellows : final CompletableFuture<String> CF_A=...
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1answer
87 views

Java 8 Stream - iterate over multiple lists and concatenate the answer

My issue is the following:I have a ListA and an ENUM. I would like to iterate over ListA and for each element from ListA apply a method get(value) where value is an ENUM. All this processing should ...
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0answers
26 views

How to convert Oozie batch start date property to a UTC format?

I have extracted a batch start date property this way: Configuration conf=new Configuration(false);conf.addResource(new Path(System.getProperty("oozie.action.conf.xml"))); String batchStartDate=...
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0answers
71 views

Is there any performance impact of flipping a null check while using ternary operator [on hold]

I ran out of curiosity & tried finding a lot whether there is any performance difference between following two statementsa !=null ? b : cAnda==null ? c : bAlso, would be great if ...
4
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1answer
56 views

Java 8 currying Function, unable to determine int[] return-type

Let's say we have a lambda Function like this:Function<ArrayList<Integer>, int[]> func1=a->new int[2];What it does isn't really important. The important things are: The input is ...
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1answer
34 views

Why does my date time parsing attempt fail?

I'm parsing the same date in two slightly different formats and I encountered an error that I don't understand.Parsing a string in the standard ISO format is successful:String s="2018-04-...
6
votes
2answers
105 views

Understand the side effect of modifying the backing collection of a stream

I wrote the following code to test the side effect of modifying the backing collection of a streamList<Integer> x=new ArrayList<>(Arrays.asList(1, 11, 21));x.stream().filter(i -> {...
1
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1answer
21 views

Running “Graphviz” viz.js from Java 8 Nashorn Engine

I'm trying to render graphviz from Java 8 (Nashorn engine) on the server, but I get the error:Exception in thread "main" javax.script.ScriptException: ReferenceError: "Promise" is not defined in <...
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votes
2answers
37 views

Logging the conditional outcome in java8 Predicate in a concise manner

I have a code like this:Predicate<String> notNull=input -> (input !=null);Predicate<String> notEmpty=input -> (input.trim().length() > 0);Its being used by my validator ...
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1answer
22 views

Unit Testing Lambda Expressions

I have a method that is shown as below and this in turn call multiple private methods, that I won't be posting here.@Beanpublic CommandLineRunner registerStartersAndReaders(final Vertx vertx, ...
2
votes
1answer
63 views

How to force lambda type to a specific one?

Suppose I have a function with such signature:public static <T> List<Future<T>> invokeAll(Stream<Callable<T>> tasks) {... submit given tasks using executor ...}...
-4
votes
2answers
71 views

Different result when using stream and parallelStream for the reduction of the same array of data?

I used reduce with stream and parallelStream on the same array with same lambda expression, and I expected the same result but the output is different. However, the results are different and I don't ...

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