错误：“setFile（null，false）调用失败”使用log4j时

问题描述

我在项目的源文件夹中添加了 log4j.properties 文件，但我仍然收到log4j：错误。

I have added log4j.properties file in source folder of project but I am still getting a log4j:error.

这是我的Log4j.properties文件：

Here is my Log4j.properties file:

    .rootCategory=DEBUG, R, O
    # Stdout
    log4j.appender.O=org.apache.log4j.ConsoleAppender
    log4j.appender.O=log44j.log
    # File
    log4j.appender.R=org.apache.log4j.RollingFileAppender
    log4j.appender.R.File=log4j.log

    # Control the maximum log file size
    log4j.appender.R.MaxFileSize=100KB

    # Archive log files (one backup file here)
    log4j.appender.R.MaxBackupIndex=1

    log4j.appender.R.layout=org.apache.log4j.PatternLayout
    log4j.appender.O.layout=org.apache.log4j.PatternLayout

    log4j.appender.R.layout.ConversionPattern=[%d{ISO8601}]%5p%6.6r[%t]%x - %C.%M(%F:%L) - %m%n
    log4j.appender.O.layout.ConversionPattern=[%d{ISO8601}]%5p%6.6r[%t]%x - %C.%M(%F:%L) - %m%n

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

    # Define the file appender
    log4j.appender.FILE=org.apache.log4j.FileAppender
    log4j.appender.FILE.File=logs/${file.name}
    log4j.appender.FILE.Append=false

    # Define the layout for file appender
    log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
    log4j.appender.FILE.layout.conversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

    log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout

这是我得到的Java异常：

Here is the Java exception that I am getting:

log4j:ERROR setFile(null,false) call failed.
java.io.FileNotFoundException: logs (Access is denied)
    at java.io.FileOutputStream.open(Native Method)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:194)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:116)
    at org.apache.log4j.FileAppender.setFile(FileAppender.java:294)
    at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:165)
    at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:307)
    at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:172)
    at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:104)
    at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:809)
    at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:735)
    at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:615)
    at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:502)
    at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:547)
    at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:483)
    at org.apache.log4j.LogManager.<clinit>(LogManager.java:127)
    at org.apache.log4j.Logger.getLogger(Logger.java:104)
    at lib.Dashboard.Reports.<init>(Reports.java:34)
    at testcases.AmazonDashboard.TC_DB17.main(TC_DB17.java:54)
AmazonDashboardTC_DB17Exception in thread "main" java.lang.NullPointerException
    at testcases.AmazonDashboard.TC_DB17.main(TC_DB17.java:131)

请告诉我，如何解决此异常，因为我已尝试将我的属性文件放在根文件夹中，现在我已将其放在源文件夹中，但在这两种情况下我都得到了上述异常。

Please let me know, how to resolve this exception, as I have tried placing my properties file in root folder and now I have placed in source folder but in both cases I got the above exception.

推荐答案

我怀疑变量 $ {file.name} 未正确替换。因此， log4j.appender.FILE.File 的值变为 logs / 。因此，Java尝试创建一个名为 logs / 的日志文件，但可能它是一个现有目录，因此您将获得异常。

I suspect that the variable ${file.name} is not substituted correctly. As a result, the value of log4j.appender.FILE.File becomes logs/. As such, Java tries to create a log file named logs/, but probably it is an existing directory, so you get the exception.

作为快速补救措施，请将 log4j.appender.FILE.File 设置更改为按绝对路径指向文件，例如 /tmp/mytest.log 。你不应该得到例外。

As a quick remedy, change the log4j.appender.FILE.File setting to point to file by absolute path, for example /tmp/mytest.log. You should not get an exception.

之后你可以继续调试为什么 $ {file.name} 是在运行时环境中未正确替换。

After that you can proceed to debugging why ${file.name} is not replaced correctly in your runtime environment.

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