The Java Real-Time Optimized (RTO) messaging API (also referred to as solclientj) is a low-latency Java Native Interface (JNI) wrapper for the C API.

Message Exchange Patterns

The Java RTO API supports all common message exchange patterns.

  • Publish / Subscribe
  • Point to Point
  • Request / Reply


The Java RTO API supports all common API features.

  • Connection management to Solace PubSub+ message brokers
  • Addition and removal of topic subscriptions
  • Sending and receiving messages Direct and Guaranteed messages
  • Extensive support for logging and customizing through property parameters
  • Request/reply messaging support Session Transactions
  • SolCache Client API support
  • Queue browsing

The Java RTO API does not currently support the following features.

  • Topic dispatch
  • XA Transactions