Both jsp-api 2.0 and el-api contain the class javax.el.ArrayELResolver At runtime, this behaves like "a box of chocolates" (you never know what you're going to get).
Upgraded jsp-api from 2.0 to 2.2 to avoid shadowing the el-api. http://github.com/droolsjbpm/droolsjbpm-build-bootstrap/commit/651ca67b3 http://github.com/droolsjbpm/jbpm-form-modeler/commit/ed3d2787f http://github.com/droolsjbpm/dashboard-builder/commit/f014f8c1f