1. Lack of a proper capacity plan.

2. The Java EE middleware environment specifications are insufficient.

Excessive Java virtual machine garbage collection.

4. Excessive or poor integration with external systems.

5. Lack of proper database SQL tuning and capacity planning.

6. Application-specific performance issues.

1. Thread-safe code issues.

2. Lack of communication API timeout handling.

3. I/O, JDBC, or relational persistence API resource management issues.

4. Lack of proper data caching.

5. Excessive data caching.

6. Excessive logging.

7. Java EE middleware tuning issues.

8. Inadequate proactive monitoring.

9. Hardware saturation on common infrastructure.

10. Network latency.