JVM Young generation's minor GC log field is unknown

Error in a program run times:

[GC (Allocation Failure) [Psyounggen:2336K,288K(2560K)] 8274K - 6418K(9728K), 0.0112926 secs][times:user=0.06 sys=0.00, real=0.01 secs]

Psyounggen: Indicates the type of GC, young generation's GC

2336K: Indicates the size of young generation space before GC occurs

288K: Indicates the size of young generation space after GC has occurred.

2560K: Indicates the size of the whole young generation

8274K: Indicates the size of the heap before GC occurs

6418K: Indicates the size of the heap after GC has occurred

9728K: Indicates the size of the entire heap

0.0112926:minor GC Time consuming