How to find where javaw exe is installed

Question

So  for a project I am working on  I need to find out where a javaw exe is located on a user s machine  How do I do that   Assuming that user is on Windows machine   The method that I used is limited to English versions of Windows only  I looked for where the OS is installed  locate the Program Files directory  locate Java  jdk directory  bin  then javaw exe  I know this will not work on non-English versions of Windows     What is the human-language-independent way to do this

User · Answer

To find  javaw exe  in windows I would use  using batch   for  f tokens  2  delims       i in   reg query HKEY CLASSES ROOT jarfile shell open command  ve   do set JAVAW PATH   i   It should work in Windows XP and Seven  for JRE 1 6 and 1 7  Should catch the latest installed version

User · Answer

For the sake of completeness  let me mention that there are some places  on a Windows PC  to look for javaw exe in case it is not found in the path   Still Reimeus  suggestion should be your first attempt    1  Java usually stores it s location in Registry  under the following key  HKLM Software JavaSoft Java Runtime Environement  lt CurrentVersion gt  JavaHome  2  Newer versions of JRE JDK  seem to also place a copy of javaw exe in  C  Windows System32   so one might want to check there too  although chances are  if it is there  it will be found in the path as well    3  Of course there are the  usual  install locations       C  Program Files Java jre  bin     C  Program Files Java jdk  bin     C  Program Files  x86  Java jre  bin     C  Program Files  x86  Java jdk  bin       Note  that for older versions of Windows  XP  Vista      this will only help on english versions of the OS  Fortunately  on later version of Windows  Program Files  will point to the directory regardless of its  display name   which is language-specific     A little while back  I wrote this piece of code to check for javaw exe in the aforementioned places  Maybe someone finds it useful   static protected String findJavaw         Path pathToJavaw   null      Path temp          Check in Registry  HKLM Software JavaSoft Java Runtime Environement  lt CurrentVersion gt  JavaHome        String keyNode    HKLM  Software  JavaSoft  Java Runtime Environment       List lt String gt  output   new ArrayList lt  gt         executeCommand new String     REG    QUERY          keyNode                                             v    CurrentVersion                        output       Pattern pattern   Pattern compile    s CurrentVersion  s   S   s              for  String line   output            Matcher matcher   pattern matcher line           if  matcher find                  keyNode           matcher group 1               List lt String gt  output2   new ArrayList lt  gt                 executeCommand                      new String     REG    QUERY          keyNode                                              v    JavaHome                         output2               Pattern pattern2                        Pattern compile    s JavaHome  s   S   s                      for  String line2   output2                    Matcher matcher2   pattern2 matcher line2                   if  matcher2 find                          pathToJavaw   Paths get matcher2 group 1    bin                                                 javaw exe                        break                                              break                      try           if  Files exists pathToJavaw                 return pathToJavaw toString                    catch  Exception ignored             Check in  C  Windows System32         pathToJavaw   Paths get  C   Windows  System32  javaw exe        try           if  Files exists pathToJavaw                 return pathToJavaw toString                    catch  Exception ignored             Check in  C  Program Files Java jre          pathToJavaw   null      temp   Paths get  C   Program Files  Java        if  Files exists temp             try  DirectoryStream lt Path gt  dirStream                    Files newDirectoryStream temp   jre                   for  Path path   dirStream                    temp   Paths get path toString     bin    javaw exe                    if  Files exists temp                         pathToJavaw   temp                         Don t  break   in order to find the latest JRE version                                                                 if  pathToJavaw    null                    return pathToJavaw toString                            catch  Exception ignored                   Check in  C  Program Files  x86  Java jre          pathToJavaw   null      temp   Paths get  C   Program Files  x86   Java        if  Files exists temp             try  DirectoryStream lt Path gt  dirStream                    Files newDirectoryStream temp   jre                   for  Path path   dirStream                    temp   Paths get path toString     bin    javaw exe                    if  Files exists temp                         pathToJavaw   temp                         Don t  break   in order to find the latest JRE version                                                                 if  pathToJavaw    null                    return pathToJavaw toString                            catch  Exception ignored                   Check in  C  Program Files Java jdk          pathToJavaw   null      temp   Paths get  C   Program Files  Java        if  Files exists temp             try  DirectoryStream lt Path gt  dirStream                    Files newDirectoryStream temp   jdk                   for  Path path   dirStream                    temp   Paths get path toString     jre    bin    javaw exe                    if  Files exists temp                         pathToJavaw   temp                         Don t  break   in order to find the latest JDK version                                                                 if  pathToJavaw    null                    return pathToJavaw toString                            catch  Exception ignored                   Check in  C  Program Files  x86  Java jdk          pathToJavaw   null      temp   Paths get  C   Program Files  x86   Java        if  Files exists temp             try  DirectoryStream lt Path gt  dirStream                    Files newDirectoryStream temp   jdk                   for  Path path   dirStream                    temp   Paths get path toString     jre    bin    javaw exe                    if  Files exists temp                         pathToJavaw   temp                         Don t  break   in order to find the latest JDK version                                                                 if  pathToJavaw    null                    return pathToJavaw toString                            catch  Exception ignored                return  javaw exe        Let s just hope it is in the path

User · Answer

Try this  for  i in  javaw exe  do  echo     PATH i

User · Answer

It worked to me       String javaHome   System getProperty  java home        File f   new File javaHome       f   new File f   bin        f   new File f   javaw exe      or f   new File f   javaws exe      work too     System out println f        exists      f exists

User · Answer

Open a cmd shell   cd    dir javaw exe  s

[java] How to find where javaw.exe is installed?

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