Is there a replacement for the garbage collection JVM args in Java 11?

user_3553550 0
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In Java 11 a number of JVM args relating to GC logging are not supported anymore. What, if anything, can they be replaced with, if we still want to use GC logging? In particular, this relates to the following JVM args: 

-Xlog:gc:work/logs/gc.log
-XX:+PrintGCTimeStamps
-XX:+PrintGCDateStamps
-XX:+PrintGCDetails
-XX:+PrintGCApplicationStoppedTime
-XX:+UseGCLogFileRotation
-XX:NumberOfGCLogFiles
-XX:GCLogFileSize

Thanks.

java-11 garbage-collection logging java
3 Answers

List of your <arguments, current mapping, reasons> is as follows:

-XX:+PrintGCTimeStamps    
-XX:+PrintGCDateStamps    ==>  decoration options
                               -Xlog:::time,level,tags

-XX:+PrintGCDetails       ==>  -Xlog:gc*

-XX:+PrintGCApplicationStoppedTime ==> -Xlog:safepoint

Note: PrintGCApplicationConcurrentTime and PrintGCApplicationStoppedTime are logged on the same tag and not separated in the new logging.

-XX:+UseGCLogFileRotation
-XX:NumberOfGCLogFiles    
-XX:GCLogFileSize          ==>  output options
                                -Xlog::::filecount=5,filesize=1024

The bits that are handled by the framework do require tweaking

Reference: The documentation I've referred to and request you to follow for such migration details.

user_17461180

BTW, although the NumberOfGCLogFiles and GCLogFileSize options are gone in Java 11, it is still possible to set rolling file size and count. For example:

java -Xlog:gc*,safepoint:gc.log:time,uptime:filecount=100,filesize=128K ...
user_10076310

It does print date with time

-Xlog:gc*:verbose_gc.log:time

[2019-05-13T14:01:03.356+0530] Heap region size: 1M
[2019-05-13T14:01:03.357+0530] Using G1

NOTE :- JDK 11 been used

user_41346830
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