A DESCRIPTION OF THE PROBLEM :
the following code:
private final void tryPresize(int size) {
        int c = (size >= (MAXIMUM_CAPACITY >>> 1)) ? MAXIMUM_CAPACITY :
            tableSizeFor(size + (size >>> 1) + 1); //
        int sc;
......

tableSizeFor(size + (size >>> 1) + 1); use load-factor of 2/3, not the documented default of 3/4.
please refer another Bug: https://bugs.openjdk.java.net/browse/JDK-8202422