XalanJ

XalanJ, or Xalan-J, is the Java version of the Xalan XSLT processor maintained by the Apache Software Foundation as part of the Apache XML project. It provides an XSLT 1.0 processor for Java applications, enabling transformation of XML documents into HTML, text, or other XML formats using XSLT stylesheets. XalanJ is designed to integrate with standard Java XML APIs, notably the Java API for XML Processing (JAXP), and can be embedded in Java applications, servlet containers, and other environments that run on the Java platform.

The package includes an optional XSLTC compiler that can translate stylesheets into Java bytecode to improve transformation performance. It interoperates with common XML parsers such as Xerces-J and supports the typical JAXP Transformer, Templates, and TransformerFactory interfaces. The project distributes under the Apache License 2.0, reflecting its open-source nature and permissive terms.

History and status: XalanJ originated as a Java port of the Xalan XSLT processor, with contributions from the Apache Software Foundation and other collaborators. It has been widely distributed and used in Java environments for many years, particularly where XSLT 1.0 processing is required or preferred for compatibility with existing stylesheets. In recent years, development activity has slowed, and some users have migrated to alternative XSLT processors that provide XSLT 2.0 or later capabilities. Despite this, XalanJ remains available in older distributions and continues to be encountered in legacy applications that rely on XSLT 1.0 processing.