Log4j 2 JSON Configuration

I found a solution to the problem.

It turns out that the Log4j 2 Configuration doesn't document all the required dependencies:

The JSON support uses the Jackson 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.jackson.core</groupId>    <artifactId>jackson-core</artifactId>    <version>2.8.7</version></dependency><dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-databind</artifactId>    <version>2.8.7</version></dependency><dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-annotations</artifactId>    <version>2.8.7</version></dependency>

I believe that I have an additional correction to the JSON configuration that was posted. For me, this part produces problems:

  "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.

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

    "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

My setup is log4j2 2.0.2 on Mac with tomcat 7.0.55

You have another flaw in there that might catch you, that I've run into with log4j json.

"appender-ref": {    "ref":"Console"},"appender-ref": {    "ref":"File"}

Try this instead, as it is now, it will only catch one appender.

"appender-ref": [{    "ref":"Console"},{    "ref":"File"}]