Can we install two versions of Java JDK in windows












6















I have created an executable jar developed on java version 8.Jar was opening on double click. But as the oracle apps support only Java 6, I had to install JRE6 but then after JRE6 installation, my executable jar is not opening.



I have set the JDK 8 bin path in Path environment variables. Please suggest a solution for this problem. Why is the jar not opening after two JAVA versions in the system?



JAR should open even if two versions 6 and 8 of java are installed in the system.










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  • 2





    Can we install two versions of Java JDK in windows Yes. Why is the jar not opening after two JAVA versions in system? Because Java 6 can't run Java 8 compiled code, you should be getting an error, and that error should have led you to the solution (recompile your application with Java 6, because Java 8 can run Java 6 compiled code).

    – Elliott Frisch
    1 hour ago











  • Hi Elliott :), Thank you for responding. My application will support only Java 8 and above.Do you have another suggestion?

    – JTechseeker
    1 hour ago











  • If your application will only support Java 8 and above, why have you installed Java 6?

    – Elliott Frisch
    1 hour ago











  • @JTechseeker set default path of your JRE to 6

    – Mustahsan
    1 hour ago











  • @ElliottFrisch : Hi Elliot, We are using oracle ERP instance which require java 6 for opening forms.

    – JTechseeker
    1 hour ago


















6















I have created an executable jar developed on java version 8.Jar was opening on double click. But as the oracle apps support only Java 6, I had to install JRE6 but then after JRE6 installation, my executable jar is not opening.



I have set the JDK 8 bin path in Path environment variables. Please suggest a solution for this problem. Why is the jar not opening after two JAVA versions in the system?



JAR should open even if two versions 6 and 8 of java are installed in the system.










share|improve this question









New contributor




JTechseeker is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
















  • 2





    Can we install two versions of Java JDK in windows Yes. Why is the jar not opening after two JAVA versions in system? Because Java 6 can't run Java 8 compiled code, you should be getting an error, and that error should have led you to the solution (recompile your application with Java 6, because Java 8 can run Java 6 compiled code).

    – Elliott Frisch
    1 hour ago











  • Hi Elliott :), Thank you for responding. My application will support only Java 8 and above.Do you have another suggestion?

    – JTechseeker
    1 hour ago











  • If your application will only support Java 8 and above, why have you installed Java 6?

    – Elliott Frisch
    1 hour ago











  • @JTechseeker set default path of your JRE to 6

    – Mustahsan
    1 hour ago











  • @ElliottFrisch : Hi Elliot, We are using oracle ERP instance which require java 6 for opening forms.

    – JTechseeker
    1 hour ago
















6












6








6








I have created an executable jar developed on java version 8.Jar was opening on double click. But as the oracle apps support only Java 6, I had to install JRE6 but then after JRE6 installation, my executable jar is not opening.



I have set the JDK 8 bin path in Path environment variables. Please suggest a solution for this problem. Why is the jar not opening after two JAVA versions in the system?



JAR should open even if two versions 6 and 8 of java are installed in the system.










share|improve this question









New contributor




JTechseeker is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












I have created an executable jar developed on java version 8.Jar was opening on double click. But as the oracle apps support only Java 6, I had to install JRE6 but then after JRE6 installation, my executable jar is not opening.



I have set the JDK 8 bin path in Path environment variables. Please suggest a solution for this problem. Why is the jar not opening after two JAVA versions in the system?



JAR should open even if two versions 6 and 8 of java are installed in the system.







java






share|improve this question









New contributor




JTechseeker is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




JTechseeker is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 44 mins ago









Mr. Semicolon

6151422




6151422






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Check out our Code of Conduct.









asked 1 hour ago









JTechseekerJTechseeker

314




314




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New contributor





JTechseeker is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






JTechseeker is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.








  • 2





    Can we install two versions of Java JDK in windows Yes. Why is the jar not opening after two JAVA versions in system? Because Java 6 can't run Java 8 compiled code, you should be getting an error, and that error should have led you to the solution (recompile your application with Java 6, because Java 8 can run Java 6 compiled code).

    – Elliott Frisch
    1 hour ago











  • Hi Elliott :), Thank you for responding. My application will support only Java 8 and above.Do you have another suggestion?

    – JTechseeker
    1 hour ago











  • If your application will only support Java 8 and above, why have you installed Java 6?

    – Elliott Frisch
    1 hour ago











  • @JTechseeker set default path of your JRE to 6

    – Mustahsan
    1 hour ago











  • @ElliottFrisch : Hi Elliot, We are using oracle ERP instance which require java 6 for opening forms.

    – JTechseeker
    1 hour ago
















  • 2





    Can we install two versions of Java JDK in windows Yes. Why is the jar not opening after two JAVA versions in system? Because Java 6 can't run Java 8 compiled code, you should be getting an error, and that error should have led you to the solution (recompile your application with Java 6, because Java 8 can run Java 6 compiled code).

    – Elliott Frisch
    1 hour ago











  • Hi Elliott :), Thank you for responding. My application will support only Java 8 and above.Do you have another suggestion?

    – JTechseeker
    1 hour ago











  • If your application will only support Java 8 and above, why have you installed Java 6?

    – Elliott Frisch
    1 hour ago











  • @JTechseeker set default path of your JRE to 6

    – Mustahsan
    1 hour ago











  • @ElliottFrisch : Hi Elliot, We are using oracle ERP instance which require java 6 for opening forms.

    – JTechseeker
    1 hour ago










2




2





Can we install two versions of Java JDK in windows Yes. Why is the jar not opening after two JAVA versions in system? Because Java 6 can't run Java 8 compiled code, you should be getting an error, and that error should have led you to the solution (recompile your application with Java 6, because Java 8 can run Java 6 compiled code).

– Elliott Frisch
1 hour ago





Can we install two versions of Java JDK in windows Yes. Why is the jar not opening after two JAVA versions in system? Because Java 6 can't run Java 8 compiled code, you should be getting an error, and that error should have led you to the solution (recompile your application with Java 6, because Java 8 can run Java 6 compiled code).

– Elliott Frisch
1 hour ago













Hi Elliott :), Thank you for responding. My application will support only Java 8 and above.Do you have another suggestion?

– JTechseeker
1 hour ago





Hi Elliott :), Thank you for responding. My application will support only Java 8 and above.Do you have another suggestion?

– JTechseeker
1 hour ago













If your application will only support Java 8 and above, why have you installed Java 6?

– Elliott Frisch
1 hour ago





If your application will only support Java 8 and above, why have you installed Java 6?

– Elliott Frisch
1 hour ago













@JTechseeker set default path of your JRE to 6

– Mustahsan
1 hour ago





@JTechseeker set default path of your JRE to 6

– Mustahsan
1 hour ago













@ElliottFrisch : Hi Elliot, We are using oracle ERP instance which require java 6 for opening forms.

– JTechseeker
1 hour ago







@ElliottFrisch : Hi Elliot, We are using oracle ERP instance which require java 6 for opening forms.

– JTechseeker
1 hour ago














2 Answers
2






active

oldest

votes


















2














You are facing Backward Compatibility problem,backwards compatibility means that you can run Java 6 program on Java 8 runtime, not the other way around.




You can Run Lower configuration on Higher Configuration not Vice-Versa




There are several reasons for that:




  1. Bytecode is versioned and JVM checks if it supports the version it
    finds in .class files.

  2. Some language constructs cannot be expressed in previous versions of
    bytecode.

  3. There are new classes and methods in newer JRE's which won't work
    with older ones.


If you really, really want (tip: you don't), you can force the compiler to treat the source as one version of Java and emit bytecode for another, using something like this:



javac -source 1.8 -target 1.6 MyClass.java


Source: A program made with Java 8 can be run on Java 7?






share|improve this answer

































    0















    In the short term,

    the answer is yes. Since both JDK files are downloaded as jar fils it will ok to download both jar files. The reason to not opening after two java versions is as @Elliott said: "in the system is Java 6 can't run Java 8 compiled code, you should be getting an error." That's exactly true but the problem is how to use multiple versions of JDK in a single machine.




    Then we have to move on to long term,

    The tricky thing is to manage these multiple JDKs and IDEs. It’s a piece of cake if I just use Eclipse for compiling my code because the IDE allows me to configure multiple versions of Java runtime. Unfortunately (or fortunately), I have to use the command line/shell to build my code. So, it is important that I have the right version of JDK present in the PATH and other related environment variables (such as JAVA_HOME).



    Manually modifying the environment variables every time I want to switch between JDKs, isn’t a happy task. But, thanks to Windows Powershell, I’m able to write a script that can do the heavy lifting for me.



    Basically, what you want to achieve is to set the PATH variable to add the Java bin folder and set the JAVA_HOME environment variable and then launch the correct Eclipse IDE. And, I want to do this with a single command. Let’s do it.




    1. Open a Windows Powershell.

    2. I prefer writing custom Windows scripts in my profile file so that it is available to run whenever I open the shell. To edit the profile, run this command: notepad.exe $profile - the $profile is a special variable that points to your profile file.

    3. Write the below script in the profile file and save it.



    function myIDE{ $env:Path = “C:vraajavajdk7bin;” $env:JAVA_HOME = “C:vraajavajdk7” C:vraaideeclipseeclipse set-location C:vraaworkspacemyproject play }




    function officeIDE{
    $env:Path = "C:vraajavajdk6bin;"
    $env:JAVA_HOME = "C:vraajavajdk6"
    C:officeeclipseeclipse
    }



    1. Close and restart the Powershell.

    2. Now you can issue the command myIDE which will set the proper PATH and environment variables and then launch the Eclipse IDE.


    As you can see, there are two functions with different configurations. Just call the function name that you want to launch from the Powershell command line (myIDE).



    If any issue please put a comment below!






    share|improve this answer
























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      2 Answers
      2






      active

      oldest

      votes








      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      2














      You are facing Backward Compatibility problem,backwards compatibility means that you can run Java 6 program on Java 8 runtime, not the other way around.




      You can Run Lower configuration on Higher Configuration not Vice-Versa




      There are several reasons for that:




      1. Bytecode is versioned and JVM checks if it supports the version it
        finds in .class files.

      2. Some language constructs cannot be expressed in previous versions of
        bytecode.

      3. There are new classes and methods in newer JRE's which won't work
        with older ones.


      If you really, really want (tip: you don't), you can force the compiler to treat the source as one version of Java and emit bytecode for another, using something like this:



      javac -source 1.8 -target 1.6 MyClass.java


      Source: A program made with Java 8 can be run on Java 7?






      share|improve this answer






























        2














        You are facing Backward Compatibility problem,backwards compatibility means that you can run Java 6 program on Java 8 runtime, not the other way around.




        You can Run Lower configuration on Higher Configuration not Vice-Versa




        There are several reasons for that:




        1. Bytecode is versioned and JVM checks if it supports the version it
          finds in .class files.

        2. Some language constructs cannot be expressed in previous versions of
          bytecode.

        3. There are new classes and methods in newer JRE's which won't work
          with older ones.


        If you really, really want (tip: you don't), you can force the compiler to treat the source as one version of Java and emit bytecode for another, using something like this:



        javac -source 1.8 -target 1.6 MyClass.java


        Source: A program made with Java 8 can be run on Java 7?






        share|improve this answer




























          2












          2








          2







          You are facing Backward Compatibility problem,backwards compatibility means that you can run Java 6 program on Java 8 runtime, not the other way around.




          You can Run Lower configuration on Higher Configuration not Vice-Versa




          There are several reasons for that:




          1. Bytecode is versioned and JVM checks if it supports the version it
            finds in .class files.

          2. Some language constructs cannot be expressed in previous versions of
            bytecode.

          3. There are new classes and methods in newer JRE's which won't work
            with older ones.


          If you really, really want (tip: you don't), you can force the compiler to treat the source as one version of Java and emit bytecode for another, using something like this:



          javac -source 1.8 -target 1.6 MyClass.java


          Source: A program made with Java 8 can be run on Java 7?






          share|improve this answer















          You are facing Backward Compatibility problem,backwards compatibility means that you can run Java 6 program on Java 8 runtime, not the other way around.




          You can Run Lower configuration on Higher Configuration not Vice-Versa




          There are several reasons for that:




          1. Bytecode is versioned and JVM checks if it supports the version it
            finds in .class files.

          2. Some language constructs cannot be expressed in previous versions of
            bytecode.

          3. There are new classes and methods in newer JRE's which won't work
            with older ones.


          If you really, really want (tip: you don't), you can force the compiler to treat the source as one version of Java and emit bytecode for another, using something like this:



          javac -source 1.8 -target 1.6 MyClass.java


          Source: A program made with Java 8 can be run on Java 7?







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 42 mins ago

























          answered 1 hour ago









          Common ManCommon Man

          2,09721429




          2,09721429

























              0















              In the short term,

              the answer is yes. Since both JDK files are downloaded as jar fils it will ok to download both jar files. The reason to not opening after two java versions is as @Elliott said: "in the system is Java 6 can't run Java 8 compiled code, you should be getting an error." That's exactly true but the problem is how to use multiple versions of JDK in a single machine.




              Then we have to move on to long term,

              The tricky thing is to manage these multiple JDKs and IDEs. It’s a piece of cake if I just use Eclipse for compiling my code because the IDE allows me to configure multiple versions of Java runtime. Unfortunately (or fortunately), I have to use the command line/shell to build my code. So, it is important that I have the right version of JDK present in the PATH and other related environment variables (such as JAVA_HOME).



              Manually modifying the environment variables every time I want to switch between JDKs, isn’t a happy task. But, thanks to Windows Powershell, I’m able to write a script that can do the heavy lifting for me.



              Basically, what you want to achieve is to set the PATH variable to add the Java bin folder and set the JAVA_HOME environment variable and then launch the correct Eclipse IDE. And, I want to do this with a single command. Let’s do it.




              1. Open a Windows Powershell.

              2. I prefer writing custom Windows scripts in my profile file so that it is available to run whenever I open the shell. To edit the profile, run this command: notepad.exe $profile - the $profile is a special variable that points to your profile file.

              3. Write the below script in the profile file and save it.



              function myIDE{ $env:Path = “C:vraajavajdk7bin;” $env:JAVA_HOME = “C:vraajavajdk7” C:vraaideeclipseeclipse set-location C:vraaworkspacemyproject play }




              function officeIDE{
              $env:Path = "C:vraajavajdk6bin;"
              $env:JAVA_HOME = "C:vraajavajdk6"
              C:officeeclipseeclipse
              }



              1. Close and restart the Powershell.

              2. Now you can issue the command myIDE which will set the proper PATH and environment variables and then launch the Eclipse IDE.


              As you can see, there are two functions with different configurations. Just call the function name that you want to launch from the Powershell command line (myIDE).



              If any issue please put a comment below!






              share|improve this answer




























                0















                In the short term,

                the answer is yes. Since both JDK files are downloaded as jar fils it will ok to download both jar files. The reason to not opening after two java versions is as @Elliott said: "in the system is Java 6 can't run Java 8 compiled code, you should be getting an error." That's exactly true but the problem is how to use multiple versions of JDK in a single machine.




                Then we have to move on to long term,

                The tricky thing is to manage these multiple JDKs and IDEs. It’s a piece of cake if I just use Eclipse for compiling my code because the IDE allows me to configure multiple versions of Java runtime. Unfortunately (or fortunately), I have to use the command line/shell to build my code. So, it is important that I have the right version of JDK present in the PATH and other related environment variables (such as JAVA_HOME).



                Manually modifying the environment variables every time I want to switch between JDKs, isn’t a happy task. But, thanks to Windows Powershell, I’m able to write a script that can do the heavy lifting for me.



                Basically, what you want to achieve is to set the PATH variable to add the Java bin folder and set the JAVA_HOME environment variable and then launch the correct Eclipse IDE. And, I want to do this with a single command. Let’s do it.




                1. Open a Windows Powershell.

                2. I prefer writing custom Windows scripts in my profile file so that it is available to run whenever I open the shell. To edit the profile, run this command: notepad.exe $profile - the $profile is a special variable that points to your profile file.

                3. Write the below script in the profile file and save it.



                function myIDE{ $env:Path = “C:vraajavajdk7bin;” $env:JAVA_HOME = “C:vraajavajdk7” C:vraaideeclipseeclipse set-location C:vraaworkspacemyproject play }




                function officeIDE{
                $env:Path = "C:vraajavajdk6bin;"
                $env:JAVA_HOME = "C:vraajavajdk6"
                C:officeeclipseeclipse
                }



                1. Close and restart the Powershell.

                2. Now you can issue the command myIDE which will set the proper PATH and environment variables and then launch the Eclipse IDE.


                As you can see, there are two functions with different configurations. Just call the function name that you want to launch from the Powershell command line (myIDE).



                If any issue please put a comment below!






                share|improve this answer


























                  0












                  0








                  0








                  In the short term,

                  the answer is yes. Since both JDK files are downloaded as jar fils it will ok to download both jar files. The reason to not opening after two java versions is as @Elliott said: "in the system is Java 6 can't run Java 8 compiled code, you should be getting an error." That's exactly true but the problem is how to use multiple versions of JDK in a single machine.




                  Then we have to move on to long term,

                  The tricky thing is to manage these multiple JDKs and IDEs. It’s a piece of cake if I just use Eclipse for compiling my code because the IDE allows me to configure multiple versions of Java runtime. Unfortunately (or fortunately), I have to use the command line/shell to build my code. So, it is important that I have the right version of JDK present in the PATH and other related environment variables (such as JAVA_HOME).



                  Manually modifying the environment variables every time I want to switch between JDKs, isn’t a happy task. But, thanks to Windows Powershell, I’m able to write a script that can do the heavy lifting for me.



                  Basically, what you want to achieve is to set the PATH variable to add the Java bin folder and set the JAVA_HOME environment variable and then launch the correct Eclipse IDE. And, I want to do this with a single command. Let’s do it.




                  1. Open a Windows Powershell.

                  2. I prefer writing custom Windows scripts in my profile file so that it is available to run whenever I open the shell. To edit the profile, run this command: notepad.exe $profile - the $profile is a special variable that points to your profile file.

                  3. Write the below script in the profile file and save it.



                  function myIDE{ $env:Path = “C:vraajavajdk7bin;” $env:JAVA_HOME = “C:vraajavajdk7” C:vraaideeclipseeclipse set-location C:vraaworkspacemyproject play }




                  function officeIDE{
                  $env:Path = "C:vraajavajdk6bin;"
                  $env:JAVA_HOME = "C:vraajavajdk6"
                  C:officeeclipseeclipse
                  }



                  1. Close and restart the Powershell.

                  2. Now you can issue the command myIDE which will set the proper PATH and environment variables and then launch the Eclipse IDE.


                  As you can see, there are two functions with different configurations. Just call the function name that you want to launch from the Powershell command line (myIDE).



                  If any issue please put a comment below!






                  share|improve this answer














                  In the short term,

                  the answer is yes. Since both JDK files are downloaded as jar fils it will ok to download both jar files. The reason to not opening after two java versions is as @Elliott said: "in the system is Java 6 can't run Java 8 compiled code, you should be getting an error." That's exactly true but the problem is how to use multiple versions of JDK in a single machine.




                  Then we have to move on to long term,

                  The tricky thing is to manage these multiple JDKs and IDEs. It’s a piece of cake if I just use Eclipse for compiling my code because the IDE allows me to configure multiple versions of Java runtime. Unfortunately (or fortunately), I have to use the command line/shell to build my code. So, it is important that I have the right version of JDK present in the PATH and other related environment variables (such as JAVA_HOME).



                  Manually modifying the environment variables every time I want to switch between JDKs, isn’t a happy task. But, thanks to Windows Powershell, I’m able to write a script that can do the heavy lifting for me.



                  Basically, what you want to achieve is to set the PATH variable to add the Java bin folder and set the JAVA_HOME environment variable and then launch the correct Eclipse IDE. And, I want to do this with a single command. Let’s do it.




                  1. Open a Windows Powershell.

                  2. I prefer writing custom Windows scripts in my profile file so that it is available to run whenever I open the shell. To edit the profile, run this command: notepad.exe $profile - the $profile is a special variable that points to your profile file.

                  3. Write the below script in the profile file and save it.



                  function myIDE{ $env:Path = “C:vraajavajdk7bin;” $env:JAVA_HOME = “C:vraajavajdk7” C:vraaideeclipseeclipse set-location C:vraaworkspacemyproject play }




                  function officeIDE{
                  $env:Path = "C:vraajavajdk6bin;"
                  $env:JAVA_HOME = "C:vraajavajdk6"
                  C:officeeclipseeclipse
                  }



                  1. Close and restart the Powershell.

                  2. Now you can issue the command myIDE which will set the proper PATH and environment variables and then launch the Eclipse IDE.


                  As you can see, there are two functions with different configurations. Just call the function name that you want to launch from the Powershell command line (myIDE).



                  If any issue please put a comment below!







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 1 hour ago









                  Mr. SemicolonMr. Semicolon

                  6151422




                  6151422






















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