JCR

The Java Content Repository (JCR) is a specification for a content repository in Java. It defines an API for storing, retrieving, and managing hierarchical content. It is developed through the Java Community Process, with versions including JCR 1.0 (JSR-170) and JCR 2.0 (JSR-283). Core concepts such as nodes, properties, node types, versions, and queries are defined.

The API provides repository, workspace, and session concepts, and supports features such as versioning, access control, observation, locking, and transactions; it supports multiple query languages (SQL2, XPath-like queries) and a pluggable persistence layer.

Implementations include Apache Jackrabbit and its scalable Oak, as well as commercial or vendor-specific repositories used by content management systems like Day CRX, Adobe AEM, and others.

Journal Citation Reports (JCR) is a separate use of the acronym: an annual publication by Clarivate Analytics that provides citation data and metrics such as Journal Impact Factor, ranking by subject category, immediacy index, and eigenfactor. It covers journals indexed in the Web of Science Core Collection and is widely used for evaluating journal influence and for funding or hiring decisions.

The two uses of JCR are unrelated beyond the acronym, and context is required to distinguish them.