Java Log4j 2 JSON 配置
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Log4j 2 JSON Configuration
提问by bblincoe
I have a configuration in XML that I would like to convert to JSON. The JSON version is not being loaded by Log4j and I cannot find any typos. My test code simply logs an ERRORlevel and a DEBUGlevel message. Only ERRORmessages are being displayed and no file output is being generated - I'm assuming the framework falls back to the default initialization instead of the JSON file.
我有一个 XML 配置，我想将其转换为 JSON。Log4j 未加载 JSON 版本，我找不到任何拼写错误。我的测试代码只是记录一个ERROR级别和一个DEBUG级别消息。只ERROR显示消息并且没有生成文件输出 - 我假设框架回退到默认初始化而不是 JSON 文件。
Note: The log4j2-test.json file is on the classpath.
注意：log4j2-test.json 文件位于类路径中。
I'm using apache-log4j-2.0-beta9binary found here.
我正在使用此处找到的apache-log4j-2.0-beta9二进制文件。
The XML configuration is the following:
XML 配置如下：
<?xml version="1.0" encoding="UTF-8"?>
<Configuration name="Test">
<Properties>
<Property name="Directory">${sys:user.home}/logs</Property>
<Property name="Filename">test.log</Property>
</Properties>
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
</Console>
<RollingFile name="File"
fileName="${Directory}/${Filename}"
filePattern="${Directory}/${date:yyyy-MM}/test-%d{MM-dd-yyyy}-%i.log.gz">
<PatternLayout>
<pattern>%d %p %logger{36} [%t] %m%n</pattern>
</PatternLayout>
<Policies>
<SizeBasedTriggeringPolicy size="1 MB"/>
</Policies>
<DefaultRolloverStrategy max="10"/>
</RollingFile>
</Appenders>
<Loggers>
<Root level="debug">
<AppenderRef ref="Console"/>
<AppenderRef ref="File"/>
</Root>
</Loggers>
</Configuration>
and the JSON configuration is:
JSON 配置为：
{
"configuration": {
"name": "Default",
"properties": {
"property": {
"name":"Directory",
"value":"${sys:user.home}/logs"
},
"property": {
"name":"FileName",
"value":"test.log"
}
},
"appenders": {
"Console": {
"name":"Console",
"target":"SYSTEM_OUT",
"PatternLayout": {
"pattern":"%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"
}
},
"RollingFile": {
"name":"File",
"fileName":"${Directory}/${FileName}",
"filePattern":"${Directory}/${date:yyyy-MM}/test-%d{MM-dd-yyyy}-%i.log.gz",
"PatternLayout": {
"pattern":"%d %p %logger{36} [%t] %m%n"
},
"Policies": {
"SizeBasedTriggeringPolicy": {
"size":"1 MB"
}
},
"DefaultRolloverStrategy": {
"max":"10"
}
}
},
"loggers": {
"root": {
"level":"debug",
"appender-ref": {
"ref":"Console"
},
"appender-ref": {
"ref":"File"
}
}
}
}
}
采纳答案by bblincoe
I found a solution to the problem.
我找到了解决问题的方法。
It turns out that the Log4j 2 Configurationdoesn't document all the required dependencies:
事实证明，Log4j 2 配置没有记录所有必需的依赖项：
The JSON support uses the Hymanson Data Processor to parse the JSON files. These dependencies must be added to a project that wants to use JSON for configuration:
<dependency> <groupId>com.fasterxml.Hymanson.core</groupId> <artifactId>Hymanson-core</artifactId> <version>2.8.7</version> </dependency> <dependency> <groupId>com.fasterxml.Hymanson.core</groupId> <artifactId>Hymanson-databind</artifactId> <version>2.8.7</version> </dependency> <dependency> <groupId>com.fasterxml.Hymanson.core</groupId> <artifactId>Hymanson-annotations</artifactId> <version>2.8.7</version> </dependency>
JSON 支持使用 Hymanson 数据处理器来解析 JSON 文件。必须将这些依赖项添加到要使用 JSON 进行配置的项目中：
<dependency> <groupId>com.fasterxml.Hymanson.core</groupId> <artifactId>Hymanson-core</artifactId> <version>2.8.7</version> </dependency> <dependency> <groupId>com.fasterxml.Hymanson.core</groupId> <artifactId>Hymanson-databind</artifactId> <version>2.8.7</version> </dependency> <dependency> <groupId>com.fasterxml.Hymanson.core</groupId> <artifactId>Hymanson-annotations</artifactId> <version>2.8.7</version> </dependency>
回答by Colin D
I believe that I have an additional correction to the JSON configuration that was posted. For me, this part produces problems:
我相信我对发布的 JSON 配置进行了额外的更正。对我来说，这部分会产生问题：
"properties": {
"property": {
"name":"Directory",
"value":"${sys:user.home}/logs"
},
"property": {
"name":"FileName",
"value":"test.log"
}
},
On my setup, this will output ~/logs/${FileName} or ~/${Directory}/test.log, which means that it is only interpolating one of the properties instead of both.
在我的设置中，这将输出 ~/logs/${FileName} 或 ~/${Directory}/test.log，这意味着它只插入属性之一而不是两者。
I concluded from this that the properties were not specified correctly in JSON form. To fix it, I specified the properties as a JSON array
我由此得出结论，未以 JSON 形式正确指定属性。为了修复它，我将属性指定为 JSON 数组
"properties": {
"property": [{
"name":"Directory",
"value":"${sys:user.home}/logs"
},
{
"name":"FileName",
"value":"test.log"
}]
},
With this in place, it seems to fix the problem and correctly outputs to ~/logs/test.log
有了这个，它似乎解决了问题并正确输出到 ~/logs/test.log
My setup is log4j2 2.0.2 on Mac with tomcat 7.0.55
我的设置是带有 tomcat 7.0.55 的 Mac 上的 log4j2 2.0.2
回答by squishy
You have another flaw in there that might catch you, that I've run into with log4j json.
您还有另一个可能会引起您注意的缺陷，我在使用 log4j json 时遇到过。
"appender-ref": {
"ref":"Console"
},
"appender-ref": {
"ref":"File"
}
Try this instead, as it is now, it will only catch one appender.
试试这个，就像现在一样，它只会捕获一个 appender。
"appender-ref": [{
"ref":"Console"
},
{
"ref":"File"
}]
