NSIS script for java installation

Question

I want to install Java using an NSIS script, but i have to know whether Java is installed or not in the system (Windows). based on the register keys how can we check if Java is installed or not?

Can anybody provide an NSIS script to check Java installation based on registery keys?

Answer 1

I didn't compile it, but I would try following. I chose registry key based on How can I detect the installed Sun JRE on Windows?.

;--------------------------------
;Defines

  !define JavaRegKey 'HKLM "Software\JavaSoft\Java Runtime Environment" ""'

;--------------------------------
;Installer Sections
Section 'Java Runtime' SecJava

  SetOutPath '$TEMP'
  SetOverwrite on
  File 'c:\<yourdir>\javasetup.exe'
  ExecWait '$TEMP\javasetup.exe' $0
  DetailPrint '..Java Runtime Setup exit code = $0'
  Delete '$TEMP\javasetup.exe'

SectionEnd

;--------------------------------
;   Functions
Function .onInit

  ReadRegStr $R0 ${JavaRegKey}
  StrCmp $R0 "" JavaMissing JavaFound

  JavaFound: 
  !insertmacro UnselectSection ${SecJava}
  Goto JavaCheckDone

  JavaMissing:
  !insertmacro SelectSection ${SecJava}

  JavaCheckDone:

FunctionEnd