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Java

ANTLR Error Handle

In this article, I will show you how ANTLR handles errors by default and how to write your own ANTLR error listener, and all the code involved is in this repo. ANTLR Default Error Behavior ANTLR has great error reporting and error recovery abilities. By default, it would only print

ANTLR Quick Start: Calculator Example

I will show you a simple calculator example built with ANTLR and Java to help you understand basic concepts and rules of ANTLR. All the code shown below is in this repo ANTLR ANTLR(ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating

Add Callback for Spring Transaction

TransactionSynchronization is an interface that enable us to add callbacks for transaction synchronization, such as send message after a successful commit. You can view official information here. I will show the way to use TransactionSynchronization in the following example: By operation defined in afterCommit, after the transaction successfully commit the

Maven Private/Multiple Repository Setup

If your Java project has a private Maven repository, or you have multiple Maven repositories, you need to additionally set up the repository info, otherwise you won't successfully get the dependencies or plugins, and see the following error message: Could not find artifact xxxx in central(https://repo.maven.apache.

@Async Exception Handling in Spring

Override method getAsyncUncaughtExceptionHandler in AsyncConfigurer could custom exception handling for @Async. Source: @Async Exception handling Spring Boot

Guava Multimap Guide

Multimap is one Map implementation from Google Guava library, maps keys to values, similar to Map, but in which each key may be associated with multiple values. You can visualize the contents of a multimap either as a map from keys to nonempty collections of values[1]: * a → 1, 2