I am building a standalone application and I'd like to use log4j 1.2 to append logs from different classes to a JTextarea, some of you might say this is not ideal because this would couple the UI and low level logging together, but this application is simply a practice, and I'd like to try all kinds of approach.
I have created some test class outside the application just to test log4j before I put it into the actual app, these are the codes what I have done,
The custom appender
log4j.properties file which I have put under resources folder, same level as src folder
problems I have now and I dont know how to resolve as following,
If I run the UI class like these, I would get a NullPointException and only the first log would be logged both into the text area and eclipse console
The PropertyConfigurator doesnot configure layout properly if I changed the requiresLayout method in JTextArea to return true, it'd be null, I believe that'd be the reason I am getting NPE, but I am so confused about how I could resolve this
If I changed this line "log4j.rootLogger=INFO, stdout, textarea" in the property file to "log4j.rootLogger=textarea", all testing log can be appended to textarea but the console prompts the following error msg - log4j:WARN No appenders could be found for logger (testing.Hello).
log4j:WARN Please initialize the log4j system properly.
If I add the Help logger to configuration file as changing the line to "log4j.rootLogger=INFO, stdout, textarea, Help" then add all layout and ConversionPattern lines for logger Help, it gives me NPE
What I want to achieve is, all logs in different classes should be able to be appended to textarea properly, using log4j.properties for configuration. I have been trying for days, since I work long hours during the day and only be able to work on my project at nights. Any help for these matters would be greatly appreciated.