Solution : https://service.sap.com/sap/support/notes/1131483 (SAP Service marketplace login required)
Key words : 
---------------------< i024101 29/aug/05 >-----------------------------phase detect_start_release_components failsthe phase detect_start_release_components fails, prepare phases ----------------------< i035760 feb/25/08 >----------------------------source release sap web, start_j2ee_ep phasethe bootstrap process fails, java vm permanent space settingif, java vm permanent space settingsfeb/25/08, -----------------------< d031901 nov/02/05 >---------------------------free space requirements, upgrade phases ----------------------< i024101 oct/21/08 >---------------------------error, ----------------------------------------------------------------------ii/ important general information --------------------< d050980, current java vm setting, upgradefor source release systems
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