Solution : https://service.sap.com/sap/support/notes/534867 (SAP Service marketplace login required)
Key words : 
terms threads kernel max_thread_proc reason, /hpux/onlinedocs/939/kcparms/kcparam, standard hp-ux command, run sap j2ee engine, symptom j2ee server crashes, hp-ux kernel control, specifynkthread >= max_thread_proc #nodes + max, sap j2ee engine, hp-ux documentation, unix kernel restricts
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