MulTEx is a simple, but powerful framework for organizing exceptions and messages in a multi-tier Java software system. It offers the key features: Causal chains/trees as a means to capture low-level error information Redundancy-free stack traces in the case of indirectly caused exceptions Internationalizable message texts and parameters for exceptions Services for reporting an exception with its causal chain/tree onto streams and screens A standard way for writing method bodies with regard to exceptions. MulTEx depends on Java >= 1.4