[logn]

SAP owns lots of products and companies and many of those are written in Java, so it's possible you're just not aware it's them. E.g., Crystal Reports.

Also, it's not that companies "rarely buy SAP products" but rather that many of their customers are large corps who are on very long upgrade cycles for boring but essential products. They make a lot of their money from consultants servicing these customers. This isn't the type of thing that you hear about in the news. In recent years they've been trying to grow their mid-market reach.