Warum log4j2 hat nicht funktioniert?

Question

Das ist meine Projektstruktur:

build.gradle

apply plugin: 'java' 
apply plugin: 'eclipse' 
apply plugin: 'idea' 

jar { 
    baseName = 'dcv_crawler_engine' 
    version = '1.0.0-SNAPSHOT' 
} 


repositories { 
    jcenter() 
} 

dependencies {  
    compile 'edu.uci.ics:crawler4j:4.2' 
    compile 'org.apache.logging.log4j:log4j-api:2.5' 

    testCompile 'junit:junit:4.12' 
    testCompile 'edu.uci.ics:crawler4j:4.2' 
    testCompile 'org.apache.logging.log4j:log4j-api:2.5' 
} 

EntryPoint.java

package com.dcvsolution.crawler; 

import edu.uci.ics.crawler4j.crawler.CrawlConfig; 
import edu.uci.ics.crawler4j.crawler.CrawlController; 
import edu.uci.ics.crawler4j.fetcher.PageFetcher; 
import edu.uci.ics.crawler4j.robotstxt.RobotstxtConfig; 
import edu.uci.ics.crawler4j.robotstxt.RobotstxtServer; 

import org.apache.logging.log4j.LogManager; 
import org.apache.logging.log4j.Logger; 

public class EntryPoint { 

    /** 
    * For logging. 
    */ 
    private static final Logger logger = LogManager.getLogger(); 

    public static void main(String[] args) throws Exception { 

     logger.info("Bat dau crawling."); 

     String crawlStorageFolder = "/data/crawl/root"; 
     int numberOfCrawlers = 7; 

     CrawlConfig config = new CrawlConfig(); 
     config.setCrawlStorageFolder(crawlStorageFolder); 

     /* 
     * Instantiate the controller for this crawl. 
     */ 
     PageFetcher pageFetcher = new PageFetcher(config); 
     RobotstxtConfig robotstxtConfig = new RobotstxtConfig(); 
     RobotstxtServer robotstxtServer = new RobotstxtServer(robotstxtConfig, pageFetcher); 
     CrawlController controller = new CrawlController(config, pageFetcher, robotstxtServer); 

     /* 
     * For each crawl, you need to add some seed urls. These are the first 
     * URLs that are fetched and then the crawler starts following links 
     * which are found in these pages 
     */ 
     controller.addSeed("http://www.ics.uci.edu/~lopes/"); 
     controller.addSeed("http://www.ics.uci.edu/~welling/"); 
     controller.addSeed("http://www.ics.uci.edu/"); 

     /* 
     * Start the crawl. This is a blocking operation, meaning that your code 
     * will reach the line after this only when crawling is finished. 
     */ 
     logger.info("Bat dau crawling."); 
     controller.start(MyCrawler.class, numberOfCrawlers);   

    } 

} 

MyCrawler.java

log4j2.properties

log4j.rootLogger=DEBUG, stdout 

mir Hilfe warum log4j nicht funktioniert?

Answer 1

Sie benötigen die log4j-api und log4j-Core-Abhängigkeit.

Derzeit haben Sie nur die API-Abhängigkeit. Fügen Sie diese auf Ihre Kompilierung Abhängigkeiten:

'org.apache.logging.log4j:log4j-core:2.5'