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order This paper mainly studies the reconsume ﹣ later of rocketmq ConsumeConcurrentlyStatus rocketmq-client-4.5.2-sources.jar!/org/apache/rocketmq/client/consumer/listener/ConsumeConcurrentlyStatus.java public enum ConsumeConcurrentlyStatus { /** * Success consumption */ CONSUME_SUCCESS, /** * Failure consumption,lat ...

Overview of Spring Boot Build Anything with Spring Boot: Spring Boot is the starting point for building all Spring-based applications. Spring Boot is designed to get you up and running as quickly as possible, with minimal upfront configuration of Spring. Here's a quote from the website, which probably means that Spring Boot is the starting po ...

I. installation of activeMQ Please refer to the online tutorial for installation steps, which will not be introduced in this article II. Modify the activeMQ configuration file New configuration information of broker schedulerSupport="true" <broker xmlns="http://activemq.apache.org/schema/core" brokerName="localhost" dataDirectory=" ...

1. Background After the new Spring Boot is built, it will bring its own packaging method. Now it is usually packaged into jar package. Of course, you can also pack it into war package, I won't introduce it! This article mainly wants to talk about the self-contained packaging method and assembly packaging method. What are the differences, advant ...

Preface Above How Mybatis XML maps to methods When you talk about result mapping in Mybatis, you need to create objects and assign values to their attributes. To create objects, you use Mybatis's built-in object factory class, DefaultObjectFactory. Of course, Mybatis also provides an extension mechanism that allows users to implement their own ...

order This paper focuses on the access validator of rocketmq AccessValidator rocketmq/acl/src/main/java/org/apache/rocketmq/acl/AccessValidator.java public interface AccessValidator { /** * Parse to get the AccessResource(user, resource, needed permission) * * @param request * @param remoteAddr * @return Plain acce ...

Spark reported an error when submitting the spark job ./spark-shell 19/05/14 05:37:40 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable Setting default log level to "WARN". To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel) ...

order This paper mainly studies the AclClientRPCHook of rocketmq RPCHook rocketmq-remoting-4.5.2-sources.jar!/org/apache/rocketmq/remoting/RPCHook.java public interface RPCHook { void doBeforeRequest(final String remoteAddr, final RemotingCommand request); void doAfterResponse(final String remoteAddr, final RemotingCommand request, ...

In Java, not all types of information can be identified at the compilation stage. Some types of information need to be determined at runtime. This mechanism is called RTTI. In English, it is called Run-Time Type Identification. Runtime type recognition. Does it taste like "knowing and doing as one"?Runtime type recognition is mainly i ...

Sometimes maven is really a hole! Sometimes it prompts invalid LOC header (bad signat ure signature), But sometimes we don't prompt anything, the engineering report is wrong, the situation is more moderate, we don't know that we have met several weird Today, I encountered the first line error of POM prompt. How can it be? No error is reporte ...