How to declare a numerical variable in Java that is to hold a digit value with a fixed length of 3 digits always. That is if i input 0, it should be formated to 000, if i input 31 then it should be formated to 032 and if i input 100 then it should remain 100. I need this for
Spring Retryable – Async context
Have an issue with @Retryable in the Async context, I have a service call which is returning a SocketTimeOut exception. This I would have expected to retry 3 times, I do have @EnableRetry, however I am seeing something I little strange in the logs, a sleep interruptedException. Here is part of the stack trace…
Cannot connect to Wildfly
I have just installed Wildfly and I tried to connect it : But gives me follow error : Failed to connect to the controller: The controller is not available at localhost:9990: java.net.ConnectException: WFLYPRT0053: Could not connect to remote+http://localhost:9990. The connection failed: WFLYPRT0053: Could not…
Java strange class cast exception
Could anyone help me understand why in 1 situation I do not have ClassCastException? At least String::trim is not a MagicFunction. Answer So, method references (like String::trim) are a bit weird; unlike most expressions in Java, they don’t really have a type of their own. Something like this: won’…
Is there any java example of verification of JWT for aws cognito API?
I am using aws cognito user pool, after user signed in, I got an id token at my single page application, which is expected, then for each request, I need to verify the id token at my backend rest API, which is in java, the aws doc didn’t mention too much about how to do it. Is there any example
Why does ManagedChannelBuilder not have TLS parameters for making TLS connections to the server?
In this example https://github.com/grpc/grpc-java/blob/master/interop-testing/src/test/java/io/grpc/testing/integration/TlsTest.java you see that the TLS client connection has various TLS parameters such as But my app has thus far used https://github.com/grpc/grpc-java/blob/master/core/src/main/java/io/grpc/M…
Prevent and Detect Deletion of an Open File
My Java program opens a file and slowly writes to the file. When the operation is completed, the program closes the file and moves the file to its final resting place in another directory. The problem is that as the operation is running, another thread in the same Java program deletes the file. Windows will n…
Deserializing a list of ints with Spring WebClient
I’m trying to communicate with a Rest service that returns a simple JSON array of ints, e.g. I have the following code to make the call via WebClient: However, Spring returns me an empty Flux. If I replace the bodyToFlux call with a bodyToMono<List<Int>>, then Spring is able to deserialize t…
RestAssured Post call with body throws an error “java.lang.AssertionError: 1 expectation failed. Expected status code but was .”
If I run the same test on Postman by choosing the post method and content type as json and with the body, it gave the response status code as 200. But my unit test is not passed. In the body, I have tried passing the json string as you see before as well as I tried passing the java object,
Opening a new window on a button click in java
I’m just starting with using interfaces in java, I’m okay with having just one window and that doing what i need. But i now want to link two windows together e.g. Frame 1 opens. user chooses button1 (enter data). Frame 2 opens so user can enter the data. Code for Frame 1: Code for Frame 2: Basical…