java – Should I add both JAVA_HOME and JRE_HOME in environmental variable, PATH?

java – Should I add both JAVA_HOME and JRE_HOME in environmental variable, PATH?

This answer explains all the steps with screenshots and examples

Better Use the 8.3 directory-format. In fact No spaces, ever.

1. JAVA_HOME – your JDK folder
   C:Program FilesJavajdk1.6.0_45 == C:PROGRA~1JavaJDK16~1.0_4
C:Program FilesJavajdk1.7.0_71 == C:PROGRA~1JavaJDK17~1.0_7
C:Program FilesJavajdk1.8.0_25 == C:PROGRA~1JavaJDK18~1.0_2
C:Program FilesJavajdk1.9.0 == C:PROGRA~1JavaJDK19~1.0

2. JRE_HOME
C:Program FilesJavajre6 == C:PROGRA~1Javajre6
C:Program FilesJavajre7 == C:PROGRA~1Javajre7
C:Program FilesJavajre1.8.0_25 == C:PROGRA~1JavaJRE18~1.0_2
C:Program FilesJavajre1.9.0 == C:PROGRA~1JavaJRE19~1.0

3. Addition to PATH – best practice!

   • USE WINDOWS+R
   • Enter C:Windowssystem32systempropertiesadvanced.exe

   • Add ;C:ProgramDataOracleJavajavapath; to the end of PATH
     (System Variables not User Variables).
     

   • Click OK, explore to C:ProgramDataOracleJava and rename javapath folder (from C:ProgramDataOracleJavajavapath) to javapath_old.

   • Create new folder named javapath.
   • Start CMD and browse into (the now empty) C:ProgramDataOracleJavajavapath.

   • Run to create symbolic links:

     1. ln -s C:Program FilesJavajre7binjava.exe java.exe
     2. ln -s C:Program FilesJavajre7binjavaw.exe javaw.exe
     3. ln -s C:Program FilesJavajre7binjavaws.exe javaws.exe
        
   • Done with PATH and *_HOME, now lets continue with the Windows Registry.

4. Open up you preferred registry editor (Registry Workshop is the best), browse HKEY_LOCAL_MACHINESOFTWAREJavaSoftJava Development Kit notice all installed versions are shown as keys, double click CurrentVersion (REG_SZ value) and modify its data to your preferred SDK version, mine is 1.7 (For Android Studio)
   

5. Do the same for HKEY_LOCAL_MACHINESOFTWAREJavaSoftJava Runtime Environment (with CurrentVersion)
   

6. Close down java-based programs such as eclipse or IntelliJ,

   • Open up task-manager- processes tab,
   • Look for explorer.exe, cmd.exe and java(*something*).exe programs,
   • Right-click eache and click End Task (not End Process-Tree!)
   • Click File➩New Task➩enter explorer.exe
     .

The changes youve done above were applied successfully
No need to reboot, no need to log-off/on again.

You really do not need to add JRE_HOME to the system variables. Tomcat looks for JAVA_HOME or JRE_HOME to get itself start. This is because tomcat require some java library to get itself started. Tomcat will provide additional debugging functionality if Jdk is provided instead of Jre. Additional details here

Adding {JAVA_HOME_DIR}/bin to your path would enable to access java from anywhere.

java – Should I add both JAVA_HOME and JRE_HOME in environmental variable, PATH?

Try this…

For Java,

In the User variables, add PATH value is C:Program FilesJavajdk1.8.0_25bin;

For Tomcat

In the System variables, add JAVA_HOME value is C:Program FilesJavajdk1.8.0_25

Now classpath has been set to your machine. You can access java from anywhere in your machine.

After Done this, Go to Command Prompt and go to ApacheTomcat*x.x and move to bin folder,,

Start the Server

startup.bat

For check Tomcat running status, Go to your browser, and Paste the URL,

http://localhost:8080/

Stop the Server

shutdown.bat