Solution : https://service.sap.com/sap/support/notes/1131481 (SAP Service marketplace login required)
Key words : 
----------------< changed d038715 jul/17/06 >--------------------------------------------< i028226/d028310 dec/08/05 >-----------------------source release 4, ---------------------< i024101 29/aug/05 >-----------------------------phase detect_start_release_components failsthe phase detect_start_release_components fails, start_j2ee_ep phasethe bootstrap process fails, ---------------------------------------------------------------------- ii/ important general information --------------------< d050980, ---------------------< d028310 aug/07/07 >----------------------------sapjup fails, upgrade phases ----------------------< i024101 oct/21/08 >---------------------------error, upgrade ---------------------< d050445 10/mar/09 >----------------------------ha, scm store user interface, prepare phases ----------------------< i035760 feb/25/08 >----------------------------, upgradefor source release systems
Related Notes : 
       
| 1112766 | READ_PROFILES fails due to wrongly detected source relese | 
| 1102065 | Add. info. on upgrading to SAP NetWeaver 7.0 SR3 Java | 
| 995116 | Backward porting of sapstartsrv for earlier releases | 
| 891510 | SAPJUP: START_J2EE_EP fails | 
| 885167 | Add. info.: Upgrade to SAP NetWeaver 7.0 Java ORACLE | 
| 879691 | Additional info on upgrading to SAP NW 2004s Java (iSeries) | 
| 873624 | Error in phase DETECT_START_RELEASE_COMPONENTS | 
| 865424 | SAPJup User SAP* login error during upgrade | 
| 851229 | Supplements to upgrade for SAP NW 7.0 Java: MaxDB | 
| 828432 | Enabling Microsoft Cluster Support in SAP MMC | 
| 825146 | Add. info. on upgrading to SAP NetWeaver 7.0 on SQL Server | 
| 819876 | DB6: Additional info about upgrade (based) on SAP NW AS 7.0 | 
| 815202 | DB2-z/OS: Additions upgrade to SAP NW AS 7.0 |