An introduction to the SpringSource Tool Suite Error Analysis. SpringSource Tool Suite (STS) provides the best and most complete set of Eclipse-based tools for building Spring-powered applications that run on the major application server platforms, including Apache Tomcat, SpringSource tc Server, SpringSource dm Server, IBM WebSphere, Oracle WebLogic, and JBoss. STS incorporates a task-focused user interface to speed development, architecture review tools to guide developers toward best practices and runtime error analysis with automated resolution lookup to help developers solve problems in running applications.