Arab traders once ruled the Indian Ocean trade. They traded with various Indian coastal kingdoms, the South-east Asian islands and got as far as the Philippines on their way to the eastern coasts of China. Yet, I've never heard of them interacting with the Japanese. Did they never reach Japan or am I missing something?
Follow up question:
In a Japanese art history class I recently took, it was remarked that glassware from Syria has been found in the collections of medieval Japanese Emperors. Would these be brought by Arabs?
I can't comment on whether or not Arab traders ever reached Japan directly. Not that I know of, but that's not really my area of study and I could easily just not know about it.
Like Teonod already posted, we tend to assume today that a merchant was going to head out and sell directly to consumers. But historically trade networks like the Silk Road and the Indian Ocean trade routes were more often worked by merchants who would transport their goods only partway along the network before they would sell them, and then those goods would be resold multiple times as they traveled further afield. The most famous example of course are Romans buying Chinese silks, even though they certainly weren't buying directly from the Chinese, but there's many other goods that were sold the same way.
While Japan did have outside trade connections (even during the Tokugawa Shogunate!), they got most of their foreign trade through the massive and close-at-hand Chinese markets.