Why I obtain this FileNotFoundException when I try to use log4j to write into a file?

Question

I am absolutly new using log4j and I have the following problem.

I am trying to print the logging line into a file named log.out.

So I create the following log4j.properties configuration file:

# Define the root logger with appender file
log4j.rootLogger = DEBUG, FILE

# Define the file appender
log4j.appender.FILE=org.apache.log4j.FileAppender
log4j.appender.FILE.File=${log}/log.out

# Define the layout for file appender
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.conversionPattern=%m%n

The problem is that, when I perform my application and when it incurs in a logging operation, something like this:

logger.debug("INTO main()");

I obtain the following exception into the console (the error message related to the log.out file is access denied (in italian Accesso negato):

log4j:ERROR setFile(null,true) call failed.
java.io.FileNotFoundException: \log.out (Accesso negato)
        at java.io.FileOutputStream.open(Native Method)
        at java.io.FileOutputStream.<init>(Unknown Source)
        at java.io.FileOutputStream.<init>(Unknown Source)
        at org.apache.log4j.FileAppender.setFile(FileAppender.java:289)
        at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:163)
        at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:2
56)
        at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.j
ava:132)
        at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.j
ava:96)
        at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigura
tor.java:654)

and don't write nothing into my log.out file (that I have created manually). This log.out file is at the same level of the performed jar file that represent my application.

Why? What am I missing? How can I solve this issue?

Tnx

Answer 1

I think $log is empty and it's trying to create a file on root and you are running program as a normal user. give it a check.