如何修复异常：无法实例化SLF4J LoggerFactory？ [英] How to fix exception: Failed to instantiate SLF4J LoggerFactory?

问题描述

我正在尝试使用jena库为语义Web编写一个java Web爬虫。我使用Netbeans构建项目。我收到两个错误：

I am trying to write a java web crawler for semantic web using jena library. I have build project using Netbeans. I am receiving two errors:

1. 无法实例化SLF4J LoggerFactory
   报告的异常：
   java.lang .NoClassDefFoundError：org / apache / log4j / Level

1. Failed to instantiate SLF4J LoggerFactory Reported exception: java.lang.NoClassDefFoundError: org/apache/log4j/Level

无法初始化类com.hp.hpl.jena.rdf.model.impl.ModelCom
org.slf4j.LoggerFactory.bind（LoggerFactory.java:128）

Could not initialize class com.hp.hpl.jena.rdf.model.impl.ModelCom at org.slf4j.LoggerFactory.bind(LoggerFactory.java:128)

我已经包含了 slf4j-api 和 slf4j-log 两个库。

I have included slf4j-api and slf4j-log both libraries.

推荐答案

您还应该包含 log4j 库，因为 slf4j-log4j 只是一个静态绑定器。

You should also include log4j library as slf4j-log4j is just a static binder.

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