Error analysis and positioning A database cluster is used in the project. When using it, it is found that the project is running and the database has not been operated for a period of time. If the database is operated again after a period of time, the following error will appear on the console. Failed […]
Tag: lifetime
asp.net core series 4 injection service lifetime
1. Lifetime of service For each registered service in the container, you can choose an appropriate service lifetime according to the program application requirements. ASP.NET Core services have three lifetime configurations: (1) Transient: Temporary lifetime, created on each request. This lifetime is suitable for lightweight, stateless services. (2) Scoped: scope lifetime, created once per request. […]
[Learn Rust programming with Xiaojia] 10. Generic Type, Trait and Lifetimes
Series article directory [Learn Rust programming with Xiaojia] 1. Basics of Rust programming [Learn Rust programming with Xiaojia] 2. Use of Rust package management tools [Learn Rust programming with Xiaojia] 3. The basic programming concept of Rust [Learn Rust programming with Xiaojia] 4. Understand the concept of ownership in Rust [Learn Rust programming with Xiaojia] […]
Thread monitoring – deadlocks, lifetimes and CPU usage
Written in front: You don’t need to grasp how to learn knowledge. Many students think that it’s good to learn routines and learn from one example. This is actually still at the level of “skills”. Everyone has to learn to understand the underlying principles and toss on their own, so this is why we have […]
[This “data storage in memory (1)” explains that I can blow it for a lifetime]
She has come, she has come, and she has come with “the storage of data in memory”! ! ! Learning time show time~ ε(*?ω?)_/?:?☆ Article directory Key points of this chapter 1. Data type introduction 1.1 Basic classification of types plastic surgery family floating point family construction type pointer type empty type 2. Storage of […]
The lifetime of a Java thread
The use of java threads 1. Overview of Java Multithreading 1.1, java is inherently multi-threaded A Java program starts to execute from the main() method, and then executes according to the established code logic. It seems that no other threads participate, but in fact Java programs are inherently multi-threaded programs, because the main() method is […]
[Solved] Possibly consider using a shorter maxLifetime value. Workaround
【Phenomenon】 2022-08-24 14:54:49.130 WARN 174160 — [nio-8082-exec-3] com.zaxxer.hikari.pool.PoolBase: HikariPool-1 – Failed to validate connection com.mysql.cj .jdbc.ConnectionImpl@7df9ca28 (No operations allowed after connection closed.). Possibly consider using a shorter maxLifetime value. 2022-08-24 14:54:54.146 WARN 174160 — [nio-8082-exec-3] com.zaxxer.hikari.pool.PoolBase: HikariPool-1 – Failed to validate connection com.mysql.cj.jdbc. ConnectionImpl@7150aa4 (No operations allowed after connection closed.). Possibly consider using a shorter […]