Short desc:
 patch-in-place issue -
    install 7u2 ( from iftw bundle ) over previously installed 7u1 ( from offline bundle ),
   Expected value of
     HKEY_LOCAL_MACHINE/SOFTWARE/JavaSoft/Java Runtime Environment/1.7.0_02/MSI/MODE is "U",
     actual is "C".

   In case of 1.7.0 fcs offline -> 7u1 iftw patch-in-place we've got expected:
     HKEY_LOCAL_MACHINE/SOFTWARE/JavaSoft/Java Runtime Environment/1.7.0_02/MSI/MODE == "U",

   Also in case 1.7.0 fcs offline -> 7u2 iftw patch-in-place we've got expected MODE == "U".

   So only patch-in-place from 7u1 ( offline ) to 7u2 ( iftw ) causes an issue.