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Tag: java-8
Java 8 edit stream elements
I need to filter and modify the values of the filtered object. The logic that must be filtered is given below. I have tried it like this. But how can we set the value of isUpdated = true using java 8? Answer Base on the logic given, findFirst should be used as you stop after the first instance is found.
Jackson 2.11.4: Set Default Value For Missing JSON field
I have the below JSON below is the POJO and I need to have both the constructors because if there is no choiceType in json I need to default it to Yes, if choiceType in json exists with null value then it should not default to Yes And my goal is to have a list of choices when the above
Sort List of Values in a Map in descending order
I have a Map with List of Doubles. unsorted map contents: {A=[0.02, 0.03], B=[0.0, 0.01], C=[0.01, 0.0], D=[0.05, 1.03], E=[1.01, 0.03]} I need to sort in descending order for List(0). I have tried the below logic but its sorting in ascending order. Actual output: {B=[0.0, 0.01], C=[0.01, 0.0], A=[0.02, 0.03]…
How to make a class’s constructor unit testable when its instantiating a Guice module in it?
I have the below mentioned class in a library module, which the clients will use to interact with database. I have a public constructor that takes a parameter from the user of this library, but the problem with this is that, its a Guice module getting instantiated inside this constructor. So when I try to wri…
Java Streams return throws error Unexpected return value
I am quite new to Java streams and I am trying to implement a method using the streams but when I try to return the value it’s throwing me the error Unexpected return value. I just wanted to know what am I doing wrong. Following is the return within the Arrays.stream value which is throwing the error: H…
How to get file name having particular content in it using java?
Here I am trying to read a folder containing .sql files and I am getting those files in an array, now my requirement is to read every file and find particular word like as join if join is present in the file return filename or else discard , someone can pls help me with this .. Answer You can search
incompatible types: bad return type in lambda expression | void is not a functional interface
I am going through Java 8 Feature and using Jshell to explore it. I tried to run the below command: But it failed with the below error: I didn’t get exactly what’s the issue Consumer takes one argument and return nothing. Same I am doing here by passing 1 arg str and printing. So what’s the …
Java 8 Optional: combine two possibly null object
I have to ensure if two values are non null. When the first and second have non null values, pass first as argument to second. If one of them are null value, then return false. This can be done in the following piece of code: It can also be done in short form: I was wondering how to do this
Consumer does not read messages from the Kafka topic (Akka Stream Kafka)
We use Akka Stream Kafka for producing and consuming messages and Strimzi Kafka cluster. Here are the versions if matters: After a refactoring message consumer stopped working. We do have messages in the topic, but consumer just waits endlessly. Here is the log fragment: Some more points: Schema registry prop…