We present jpf-logic. It is an extension of Java PathFinder (JPF), a model checker for Java apps. Our extension jpf-logic provides a framework to check properties expressed in temporal logics such a linear temporal logic (LTL) and computation tree logic (CTL). To support a logic in our framework, one has to implement a parser for the logic, one has to develop a hierarchy of classes that represent the abstract syntax of the logic and implement a transformation from parse trees of formulas to the corresponding abstract syntax trees, and one has to implement a model checking algorithm that takes as input an abstract syntax tree of a formula and a partial transition system. The latter represents a model of the Java app. All three components have been implemented for CTL. The first two have been implemented for LTL.