java - Log4J - JsonLayout and RollingFileAppender generating invalid JSON -

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i'm trying store logs in json files using log4j (2.6.2). i'm using jsonlayout in rollingfileappender, , it's working long i'm not trying append file has been written previously.

here's code setting layout , appender:

layout<?> layout = jsonlayout.createlayout(config, false, false, false, true, false, true, "[", "]", charset.defaultcharset());  string appenderfilename = "mylogfile-latest.log.json"; string appenderfilepattern = "mylogfile-%i.log.json"; string appendername = "myappender"; appender appender = rollingfileappender.createappender(appenderfilename, appenderfilepattern, "true", appendername, "true", "256", "true",         sizebasedtriggeringpolicy.createpolicy(this.configuration.getlogmaxsize().tostring()),         null, layout, null, "false", "false", null, config);

as said, it's working fine first time i'm writing in log file:

[   {     "timemillis" : 1469620840442,     "thread" : "simpleasynctaskexecutor-43",     "level" : "error",     "loggername" : "mylogger",     "message" : "my log message",     "endofbatch" : false,     "loggerfqcn" : "org.apache.logging.log4j.spi.abstractlogger",     "threadid" : 243,     "threadpriority" : 5   }   , {     "timemillis" : 1469620840442,     "thread" : "simpleasynctaskexecutor-43",     "level" : "debug",     "loggername" : "mylogger",     "message" : "my log message",     "endofbatch" : false,     "loggerfqcn" : "org.apache.logging.log4j.spi.abstractlogger",     "threadid" : 243,     "threadpriority" : 5   } ]

i close appender, etc... , relaunch application, , when i'm writing new logs existing file, here's i'm getting:

[ {   "timemillis" : 1469620840442,   "thread" : "simpleasynctaskexecutor-43",   "level" : "error",   "loggername" : "mylogger",   "message" : "my log message",   "endofbatch" : false,   "loggerfqcn" : "org.apache.logging.log4j.spi.abstractlogger",   "threadid" : 243,   "threadpriority" : 5 } , {   "timemillis" : 1469620840442,   "thread" : "simpleasynctaskexecutor-43",   "level" : "debug",   "loggername" : "mylogger",   "message" : "my log message",   "endofbatch" : false,   "loggerfqcn" : "org.apache.logging.log4j.spi.abstractlogger",   "threadid" : 243,   "threadpriority" : 5 }  ] {     "timemillis" : 1469620840490,     "thread" : "simpleasynctaskexecutor-43",     "level" : "error",     "loggername" : "mylogger",     "message" : "my log message",     "endofbatch" : false,     "loggerfqcn" : "org.apache.logging.log4j.spi.abstractlogger",     "threadid" : 245,     "threadpriority" : 5   }   , {     "timemillis" : 1469620840492,     "thread" : "simpleasynctaskexecutor-43",     "level" : "debug",     "loggername" : "mylogger",     "message" : "my log message",     "endofbatch" : false,     "loggerfqcn" : "org.apache.logging.log4j.spi.abstractlogger",     "threadid" : 245,     "threadpriority" : 5   }  ]

this issue makes impossible parse logs gson fail create list file.

do have idea on how fix issue without doing crappy hack removing ] , replacing comma?

thanks!

the reason why jsonlayout create "well-formed" json document. need put each document in own file (with start , end brackets) true, isn't case here.

you have 2 options:

  1. for jsonlayout, set complete=false (you have true in sample) print out without '[' , ']'. can add these chars before calling gson (as file not have array).
  2. create own jsonlayout (you need extend abstractstringlayout) using simple org.json:json or gson string file.

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