Table of Contents SpringBoot application starts org.apache.catalina.LifecycleException Problem Description Cause Analysis Solution 1. Check the resources that the application depends on 2. Check application configuration 3. Check port occupancy 4. Check dependent component version compatibility 5. Check the log files Application scenario example: org.apache.catalina.LifecycleExceptionexception caused by database connection exception SpringBoot application starts org.apache.catalina.LifecycleException When developing […]
Tag: pac
Golang standard library: bytes package – byte slice byte array convenient operation
2.2 bytes – byte slice convenient operation This package defines some convenience operations for manipulating byte slices. Because strings can be represented as []byte, the functions and methods defined by the bytes package are very similar to the strings package, so the explanation will be similar to the strings package and can even be referred […]
Golang standard library: sort package – sorting algorithm
3.1 sort – sorting algorithm This package implements four basic sorting algorithms: insertion sort, merge sort, heap sort, and quick sort. But these four sorting methods are not public, they are only used internally by the sort package. Therefore, when sorting a data set, you do not need to consider which sorting method should be […]
Word2Vec word vector analysis (word similarity) based on the character story of Genshin Impact character Keqing
First get the character text of Keqing: raw_texts = [ “Emperor Yanwang brought prosperity to Liyue Port, and his reputation for governing the world was turned into novels and biographies that people talked about. However, as one of the people closest to God, Keqing seems to be the one who lacks the least awe. \ […]
PureEdgeSim -locationmanager package -MobilityModel file
MobilityModel The main class of the mobility manager module, which generates mobility paths for different edge devices. Current device location protected Location currentLocation; Is the device moving? protected boolean isMobile = false; Minimum pause duration protected double minPauseDuration; Maximum pause duration protected double maxPauseDuration; Maximum movement duration protected double maxMobilityDuration; Minimum movement duration protected double […]
Develop your own R package
This content is excerpted from the R language special section of “Gene Academy VIP Course (Season 2)”. An R package is a collection of functions, documentation and data saved in a standard format. Packages allow us to organize our functions in a well-defined and fully documented way, and make it easy for us to share […]
recycleView (2) Grid, there is spacing in the middle, left, right, top, and bottom have no spacing
1. Function 1. Renderings The top, bottom, right and left of item are all 0 2. Code 1. Key code //Set the spacing between RecycleView items. The upper and lower spacing is 20 for sorting, and the left and right spacing is 20 for sorting. binding.rv.addItemDecoration(object : RecyclerView.ItemDecoration() {<!– –> override fun getItemOffsets(outRect: Rect, view: […]
I am learning OpenCV color space conversion in Vscode
Article directory color 【1】Color space (color gamut) (1) **RGB color space** Conversion to xyz color space Convert RGB color space to XYZ color space Convert XYZ color space to RGB color space (2) **CMYK color space** (3) **HSV** (**Hue, Saturation, Value**) color space (4) **YUV and YCbCr color space** 【2】Color space conversion 2.1 GRAY color […]
Data structure – time complexity and space complexity
1. Algorithm efficiency 1.1 Complexity of algorithm After the algorithm is written into an executable program, it takes time, resources and space to run. ( Memory ) resource . therefore Measuring the quality of an algorithm, generally Measured from two dimensions: time and space , namely time complexity and space complexity. Time complexity mainly measures […]
[Elementary Data Structure] Time Complexity and Space Complexity of Algorithms
Hello readers! Now I will briefly talk about a basic knowledge point in data structure based on C language: the time complexity and space complexity of the algorithm. I hope it will be helpful to you. Table of Contents 1. What is a data structure? 2. What is an algorithm? 3. Time complexity 3.1 The […]