simply about difficult
Java has a caching standard – JCache. This standard is described in the JSR-107 specification. This standardized approach makes it easier to integrate with different tools that perform the same function. Thus, Spring Boot supports JCache integration. Therefore, whatever implementation of JCache we would use, the code remains the same. Some of the common JCache […]
READ MOREFull exception text: Most likely, this error occurs due to the old metrics that came from Spring Boot 1 used together with Spring Boot 2. If you urgently need to start the application, then as a workaround, you can disable one of the metrics modules in this way: find the place in your application where […]
READ MOREFull text exception text: Spring Boot 2 is no longer support MetricsRegistry by default. If you want to continue using the MetricsRegistry for your own purposes, just create a new bean:
READ MOREFirst, let’s figure out how the timeout differs from the deadline. Timeout is relative value, but deadline is absolute. If we take a timeout and a deadline of 5 seconds, and we will write the following line (the code for an example, it will not work if you run it): Then, if you want to […]
READ MOREImagine you are faced with an error like this: The point is that if you create a gRPC channel, you must close it after use. Let’s say you’ve already made a channel like this: After use, it will need to be closed. It is important to wait until it closes; awaitTermination() is used for this:
READ MORESuppose you have code like this in Scala: And you run it like this: And you want to put it in a Scala Object so that IntelliJ IDEA doesn’t highlight the code in red. Firstly, you are going to do smth like that: But when you run the script, nothing happens and spark2-shell just opens. […]
READ MORETo create a Scala project using Maven to manage dependencies in IntelliJ IDEA, you first need to install the Scala plugin: File -> Preferences (Settings) -> Plugins Search Scala in the Marketplace Install it and restart IntelliJ IDEA Next, let’s create a regular Java + Maven project: File -> New -> Project Select Maven -> […]
READ MORESuppose that you have a Kafka Topic with some data, and you connect to it with Kafka Consumer with a new group.id. But this consumer does not read messages from the beginning of the topic. Consumer Config has a specific property auto.offset.reset, which indicates which offset will be assigned to the consumer with the new […]
READ MORESuppose that you have this exception: Most often this happens due to syntax errors in the original JSON. Firstly, check that your source JSON is NOT empty string! Then check your syntax, for example, that you do not have extra space: Or extra commas:
READ MORESuppose you have a class with constants: And you made the static import of this constant in another class: Everything looks good, and IDEA does not show any mistakes (in fact, there are really no errors in code). But Maven suddenly failed building project with cannot find symbol error. This situation can arise because there […]
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