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• Object persistence is provided by Hibernate v3.2.6 (v3.6.7 in Grouper 2.1+) (custom hibernate 3.6.7 in Grouper 2.2.0+_, which in turn uses JDBC to connect with a back-end RDBMS.
• DDL is generated by Apache's DdlUtils. Grouper is currently tested against Oracle, MySQL, PostgreSQL, SQL Server but should work with most databases that implement views and are supported by Hibernate. 
• If you are using SQL Server, the packaged JDBC driver for SQL Server along with jTDS 1.2.5 are known to work properly, though SQL server does not have as good of performance as Oracle, MySQL, or postgres.

• Servlet API Version 2.3.
• Known to run properly in Apache Tomcat 6.0. ( Tomcat 8.5 is also an option in the installer.)
• Have not tested/verified other servlet containers.

User Interface - Servlet container, REMOTE_USER via servlet container, or user-installable servlet filter.  
Contributions: Yale CAS authentication filter.
Web Services - Servlet container, HTTP Basic, HTTP Basic with Kerberos, Rampart, or user-installable plug-in.

• JDK v6.0.13 or later. Java8 in the PSP can have scripting problems with the example code. For now stay with Java 7 or 6.
• Minimum permgen memory size: 130M (-XX:MaxPermSize=130M) (needs to be larger if more classes loaded)
• Minimum heap memory size: 500M. (-Xmx500M) (needs to be larger for big deployments)

Ant v1.7.0 or later. Ensure that Ant can process Tomcat tasks by verifying that tools.jar (found in $JAVA_HOME/lib) and catalina-ant.jar (in $TOMCAT_HOME/server/lib) are in the classpath.

• XHTML 1.0
• CSS 2.1
• cookies must be enabled
• javascript must be enabled
• AJAX compatible