Log4j2无法使用json配置文件

Question

似乎log4j试图通过XML解析器解析.json配置文件，但是为什么呢？

我通过命令行参数设置log4j配置文件：

-Dlog4j.configurationFile=src/log4j2.json

文件内容：

{
    "configuration": {
        "appenders": {
            "Console": {
                "name": "Console",
                "target": "SYSTEM_OUT",
                "PatternLayout": {
                    "pattern": "%date %thread %logger %message"
                }
            }
        },
        "loggers": {
            "root": {
                "level": "debug",
                "appender-ref": {
                    "ref": "Console"
                }
            }
        }
    }
}

我得到的是：

[Fatal Error] log4j2.json:1:1: Content is not allowed in prolog.
ERROR StatusLogger Error parsing D:\Dev\HDelphiCrawler\src\log4j2.json org.xml.sax.SAXParseException; systemId: file:///D:/Dev/HDelphiCrawler/src/log4j2.json; lineNumber: 1; columnNumber: 1; Content is not allowed in prolog.
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:257)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:348)
    at org.apache.logging.log4j.core.config.xml.XmlConfiguration.<init>(XmlConfiguration.java:140)
    at org.apache.logging.log4j.core.config.xml.XmlConfigurationFactory.getConfiguration(XmlConfigurationFactory.java:44)
    at org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:410)
    ....and so on...
ERROR StatusLogger No logging configuration

我的lib文件夹中的Jar：

• hamcrest-junit-2.0.0.0.jar
• jackson-annotations-2.6.1.jar
• Jackson core-2.6.1.jar
• jackson-databind-2.6.1.jar
• java-hamcrest-2.0.0.0.jar
• junit-4.12.jar
• kotlin-reflect.jar
• kotlin-runtime-sources.jar
• kotlin-runtime.jar
• log4j-api-2.3.jar
• log4j-core-2.3.jar
• log4j-slf4j-impl-2.3.jar

Answer 1

您可以使用system属性log4j.configurationFactory：

-Dlog4j.configurationFactory=org.apache.logging.log4j.core.config.json.JsonConfigurationFactory