common causes of the JEE application performance problems

1  application capacity can not meet the growing business needs,the reasons of causing system crashed  are the following:

a) the overload of Java Heap

b)the increasing CPU utilization causing the degradation  of system performance

2 timeout parameter setting with the external systems.let us take a look at the following graph

from this chart,we can see, if a system involves many business processes with external systems.the client JEE application usually triggers socket connections to read or write data to and from external systems via network ,the connection type can be synchronous
or aysnchronous depending of the implementation of the business demands

so timeout configuration is very crucial to the performance .if the JEE client waits too long ,and many threads will stuck and wait the responses from the external systems.gradually ,i will slow the system.so the reasonal timeout is crucial for the application

3 excessive logging:excessive logging will trigger high IO on server and create the CPU utility

4 database tunning. like the long time task execution ,it will let threads to get stuck .

5 database timeout setting

6 thread safe synchronized

7