On Liberty, the dynamic cache service is provided by the Distributed Map Interface for Dynamic Caching feature, distributedMap-1.0, and the Web Response Cache feature, webCache-1.0. The implementation has the following restrictions:

• No cache replication
• Only the high-performance disk caching mode is supported with random and size eviction techniques
• There is no support for Web Services client and server side caching as well as portlet caching in the cachespec.xml file
• Portlet caching and Web Services client and server side caching are not supported in the cachespec.xml file
• Servlet caching of SingleThreadModel servlets is not supported
• Defining cache configuration by using properties files is not supported for JAR files that contain only Enterprise JavaBeans
• Limiting the memory cache sizes in megabytes works only for 32-bit Java Virtual Machines

This rule flags Java code that has references to the following packages:

• com.ibm.websphere.cache
• com.ibm.ws.cache
• com.ibm.wsspi.cache
• com.ibm.websphere.servlet.cache

References to the com.ibm.websphere.cache.webservices package are handled by a different rule, The WebSphere web services APIs are unavailable.

The following APIs and SPIs are not available in Liberty:

• com.ibm.websphere.cache.ServletCache
• com.ibm.wsspi.cache.CacheInstanceResourceBinder
• com.ibm.wsspi.cache.CacheMonitor
• com.ibm.wsspi.cache.ESIStats
• com.ibm.wsspi.cache.ESIStats$ESIServerStats
• com.ibm.wsspi.cache.ESIStats$ESIServerStats$ESIProcessorStats
• com.ibm.wsspi.cache.ESIStats$ESIServerStats$ESIProcessorStats$ESICacheEntryStats

This rule is flagged once per Java class.

For detailed information about dynamic cache on Liberty, see the following resources:

• Liberty:Runtime environment known issues and restrictions
• Dynamic cache in Liberty document
• Distributed Map interface for Dynamic Caching feature documentation
• Web Response Cache feature documentation