android - loging with log4j stackoverflow error -

i trying add log statements in code.

using logconfigurator, wrote following code in mainactivity -

    public class mainactivity extends activity {       logger log = logger.getlogger(mainactivity.class);     @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);       logconfigurator logconfigurator = new logconfigurator();      logconfigurator.setfilename(environment.getexternalstoragedirectory()              + file.separator + "myapp" + file.separator + "logs"              + file.separator + "log4j.txt");      logconfigurator.setrootlevel(level.debug);      logconfigurator.setlevel("org.apache", level.error);      logconfigurator.setfilepattern("%d %-5p [%c{2}]-[%l] %m%n");      logconfigurator.setmaxfilesize(1024 * 1024 * 5 * 1024 );      logconfigurator.setimmediateflush(true);      logconfigurator.configure();      log.info("execution of method oncreate started");       mytask mtask = new mytask();      mtask.execute();      log.info("execution of method oncreate ended");    } 

it worked properly. when add

        logger log = logger.getlogger(jsonconversion.class); 

in class named jsonconversion , more classes, following error in logcat

    07-11 04:32:27.693: e/androidruntime(3963): fatal exception: main     07-11 04:32:27.693: e/androidruntime(3963): java.lang.stackoverflowerror     07-11 04:32:27.693: e/androidruntime(3963):     @    org.apache.log4j.categorykey.equals(categorykey.java:47)     07-11 04:32:27.693: e/androidruntime(3963):     @ java.util.hashtable.get(hashtable.java:271)     07-11 04:32:27.693: e/androidruntime(3963):     @ org.apache.log4j.hierarchy.getlogger(hierarchy.java:273)     07-11 04:32:27.693: e/androidruntime(3963):     @ org.apache.log4j.hierarchy.getlogger(hierarchy.java:247)     07-11 04:32:27.693: e/androidruntime(3963):     @ org.apache.log4j.logmanager.getlogger(logmanager.java:228)     07-11 04:32:27.693: e/androidruntime(3963):     @ org.apache.log4j.logger.getlogger(logger.java:117)     07-11 04:32:27.693: e/androidruntime(3963):     @ com.example.news_android_mobile_application_cd.jsonconversion.<init>(jsonconversion.java:25)     07-11 04:32:27.693: e/androidruntime(3963):     @ com.example.news_android_mobile_application_cd.mainactivity.<init>(mainactivity.java:25) 

i have added log4j-1.2.17.jar , android-logging-log4j-1.0.3.jar . can me out ?

well don't know exact answer following might 1 of reasons -

1. there static methods in program, use log in method made them non static , created different objects in different classes, led stackoverflow.
2. i made log variable static , did work !

one more thing, size of file should kept in mind. if size of data written exceeds file size, multiple files created.