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jvm settings http://www.360doc.com/content/12/1023/16/9615799_243296263.shtml Heap setup -Xms: initial heap size -Xmx: maximum heap size -20: Newsize = n: set younger generation size -20: Newratio = n: set the ratio of young generation to old generation. For example, if it is 3, it means that t ...

Article directory Transformation operator Basic operator 1. map(func) 2. filter(func) 3. flatMap 4. Set operation (union, intersection, distinct) 5. Grouping (groupByKey, reduceByKey, cogroup) 6. Sorting (sortBy, sortByKey) Advanced operator 1. mapPartitionsWithIndex(func) 2. aggregate 3. aggreg ...

Article directory What is ActiveMQ What is JMS? Object model of JMS Message model of JMS Message structure of JMS Message header Message attribute Message body Features of ActiveMQ ActiveMQ installation Make system service Web management platform using ActiveMQ Web management configuration Using ...

The premise is that you buy the certificate first, download it, and open the certificate compression package with 3 files in total   Certificate file: with. crt as the suffix or file type. Certificate chain file: with. crt as the suffix or file type. key file: with. key as the suffix or file type.   Create a new cert directory in the Apache ...

  Request line: Request Method, Request Address and Parameters public class LineServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1. How to get the request String method = request.getMethod( ...

This article is suitable for programmers with programming experience. It is a machine learning "Hello world!" People who don't have much theoretical knowledge should take a detour. Preface Artificial intelligence is undoubtedly one of the hottest technical topics in recent years. The artificial intelligence technology represented b ...

What is Ribbon 　　 Ribbon is a customer service load balancing tool based on HTTP and TCP, which is implemented based on Netflix Ribbon. It is not deployed independently like Spring Cloud service registry, configuration center and API gateway, but it exists in almost every Spring Cloud microservice. Including the declarative service call provi ...

Source code analysis Because spring security social is implemented based on social authentication filter, let's start with social authentication filter When it comes to Filter, there must be a corresponding configuration class SocialAuthenticationFilter is no exception. Its corresponding configuration class is SpringSocialConfigurer. To make ...

Source code of the project: https://github.com/zhuquanwen/mybatis-learn/releases/tag/with-annotation Construction process: Based on the previous article, some processes are not described in detail. The previous source code has been attached. Please refer to the previous article: https://blog.csdn.net/u0 ...

Want to get the most complete and detailed information of the whole network: (1022848328)   JWT generates token with error: secret key byte array cannot be null or empty java.lang.IllegalArgumentException: secret key byte array cannot be null or empty. at io.jsonwebtoken.lang.Assert.notEmpty(Asse ...