[LOG4J2-3092] JSON Template Layout JsonWriter formattableBuffer Memory leak

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.14.0, 2.14.1
• Fix Version/s: 3.0.0, 2.15.0
• Component/s: JsonTemplateLayout
• Assignee: Volkan Yazici
• Reporter: xmh51
• Created: 19/May/21 06:36
• Updated: 27/Jul/21 06:44
• Resolved: 04/Jun/21 09:01

Description

JSON Template Layout

1 use recycler is queue or threadLocal

2 JsonWriter formattableBuffer receive big string

3 the StringBuilder inner char array  expansion and length never getting smaller

 

E.g.:

 

public Object test() {
    StringBuilder sb=new StringBuilder();
    for(int i=0;i<10;i++){
        for(int j=0;j<10;j++){
            sb.append(UUID.randomUUID());
        }
        log.info(""+sb+sb);
    }
    return "success";
}

 

 

 

Issue Links

• is duplicated by: LOG4J2-3129 Memory Leak in JsonTemplateLayout