Worked on the langchain4j/langchain4j repository to enhance exception handling documentation by adding comprehensive class-level Javadocs to twelve public exception classes. Focused on clarifying the conditions under which each exception is thrown and detailing the implications for retry logic, the work aimed to reduce ambiguity for developers integrating with the library. The changes, implemented in Java, were documentation-only and did not affect runtime behavior, ensuring stability while improving clarity. All updates were verified through unit and integration tests across core modules. This effort supports better onboarding, reduces misconfiguration risks, and enables more reliable retry strategies for downstream users and integrators.