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Today ARM compiler of OPENJDK, downloaded a version of Big Endian:
https://github.com/vascokk/openjdk8-aarch64_be
Compile an error as follows:
checking for target address size... 64 bits
checking whether byte ordering is bigendian... no
configure: error: The tested endian in the target (little) differs from the endian expected to be found in the target (big)
configure exiting with result code 1
Thus, the default should be little endian