[jbpm-dev] ask for help!

Dear memmbers of JBPM Community: i write this letter to ask for some examples about jbpm,i'm a java developer in xi'an ,China.my work is to do workfow and other persistence work.i work in a company that produce software for Electric company to manage their materials,and the boss let me learn jbpm for their further use,i surf to find demos about that,but in vain,i dont know how to start my thread to learn that,can you give me some ways to learn that,thank you !