"The numeric type is further divided into a numerical tower, with subtypes complex, real, rational and integer. (Note that these subtypes are not disjoint; in fact each type is a subset of the previous one). While it is not required that a Scheme implementation support the entire numerical tower, most implementations do. In addition to these traditional properties, Scheme numbers may have the property of "exactness". Integers and rational numbers are exact. An arithmetic operation involving numbers one or more of which is inexact has an inexact result.[1]"
In other words, some implementation of real numbers of scheme is imprecise.
Besides, I don't think Java has such problem.
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