This image shows four boxes at the top, from left to right: BPEL Engine, Database, JTA, and Cache. Vertical lines are attached to the bottoms of each box. Below the boxes are several horizontal lines. There is a horizontal line labeled JPA with an arrow pointing from the BPEL Engine box to the Database box. There is a horizontal line labeled alterCompletion with an arrow pointing from the JTA box to the BPEL Engine box. There is a horizontal line labeled put with an arrow pointing from the BPEL Engine box to the Cache box.