USD/JPY has rallied with the yen unable to benefit from risk aversion of late because higher oil prices and higher bond yields are encouraging yen shorts to stick to the game plan. Yen shorts from the CFTC data (dated last Tuesday) and they have grown further. Additionally, the yen short in options is currently the biggest ever.
This leaves the yen short position vulnerable to a squeeze and the following charts illustrate the technical bearish bias from a longer-term chart resistance point of view:
The price has broken into fresh territory mid-week, the highest in four years. However, it is moving in on a resistance zone as illustrated above which likely means we will see a correction in due course.
USD/JPY will be expected to struggle as it approaches the post-1990 downtrend which provides huge resistance. If the price can't punch through 115, it will be expected to falter.