With the latest update port 2.2.0 it came with subversion 1.8 which I don't need it right now. After googling for a while, here's how to downgrade.
$port installed subversionThe following ports are currently installed:
subversion @1.7.8_1
subversion @1.7.8_2
subversion @1.7.9_1
subversion @1.7.10_1
subversion @1.8.1_3 (active)
$port installed subversion-*The following ports are currently installed:
subversion-javahlbindings @1.7.9_0
subversion-javahlbindings @1.7.10_0
subversion-javahlbindings @1.8.1_2 (active)
$port installed serf*The following ports are currently installed:
serf1 @1.1.1_0
serf1 @1.2.0_0
serf1 @1.2.0_0+universal
serf1 @1.2.1_0+universal
serf1 @1.3.1_0 (active)
serf1 @1.3.1_0+universal
** If there's not serf1 installed, execute "sudo port install serf1" to install it.
Execute this command to downgrade to Subversion 1.7 with java-hl support
$sudo port activate subversion @1.7.10_1 subversion-javahlbindings @1.7.10_0 serf1 @1.2.0_0
note: the version number might different than mine.
To check if we already able to use subversion 1.7 ; execute this command
$svn help | lessusage: svn <subcommand> [options] [args]
Subversion command-line client, version 1.7.10.
Type 'svn help <subcommand>' for help on a specific subcommand.
Reference: comment#1 in downgrading-subversion-from-1-8-to-1-7-in-macports
“The only true wisdom is knowing that you know nothing.”