Install JDK 8 manually on Windows

To install the JDK manually on a windows system:

• Download the JDK Executable from Oracle
• Extract the content of the installer exe to an empty folder (e.g. c:\jdk8)
• Extract the extracted tools.zip into the same folder
• Delete the tools.zip after successfull extraction 
• Open a command line and change into the folder (cd c:\jdk8)
• In the extraction directory execute (one line):
  

  for /r %x in (*.pack) do .\bin\unpack200 -r "%x" "%~dx%~px%~nx.jar"

• Set the JAVA_HOME environment variable if required