yu created SLF4J-469:
------------------------
Summary: Potential memory leaks if there is no underlying
implementation
Key: SLF4J-469
URL: https://jira.qos.ch/browse/SLF4J-469
Project: SLF4J
Issue Type: Bug
Affects Versions: 1.7.26
Environment: java 8
slf4j 1.7.26
Reporter: yu
Assignee: SLF4J developers list
Priority: Critical
*If I don't have 'logback' 'log4j'...... Implementation class*
The problem lies in the method
*public static ILoggerFactory getILoggerFactory()*
first Thread1:
{code:java}
if (INITIALIZATION_STATE == UNINITIALIZED) {
init.....
}
{code}
secode Thread2:
{code:java}
case ONGOING_INITIALIZATION:
return SUBST_FACTORY;{code}
obtained "SUBST_FACTORY"，
and obtained "SubstituteLogger"
third:
Thread1:
{code:java}
//init failed cache "NoClassDefFoundError"
INITIALIZATION_STATE = NOP_FALLBACK_INITIALIZATION;
{code}
*The SubstituteLogger obtained by Thread2 will always output the log to the
queue until the memory overflows.*
{code:java}
// code placeholder
synchronized public Logger getLogger(String name) {
SubstituteLogger logger = loggers.get(name);
if (logger == null) {
logger = new SubstituteLogger(name, eventQueue, postInitialization);
loggers.put(name, logger);
}
return logger;
}
public void info(String msg) {
delegate().info(msg);
}
Logger delegate() {
if(_delegate != null) { //_delegate== null forever
return _delegate;
}
if(createdPostInitialization) { createdPostInitialization == false forever
return NOPLogger.NOP_LOGGER;
} else {
return getEventRecordingLogger();
}
}
{code}
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