Solution : https://service.sap.com/sap/support/notes/682707 (SAP Service marketplace login required)
Key words : 
memory leak reason, symptom nullpointers occur, javaoutofmemory error occurs, program error, longer occur, apply notes 677063, support package 18, support packages 8, simply import, prerequisites
Related Notes : 
       
| 677063 | IPC server crashes and is restarted | 
| 654355 | Update of the SAP JCo version for IPC 3.0 and 4.0 | 
| 620616 | Memory leak when running TTE with big order | 
| 530835 | IPC Support Packages for CRM 3.0, CRM 3.1 and CRM 4.0 | 
| 486061 | How to get patches for CRM Internet Pricing Configurator |