I installed jdk-14.0.1_windows-x64_bin.exe from https://www.oracle.com/java/technologies/javase-jdk14-downloads.html.
I added C:\Program Files\Java\jdk-14.0.1\bin to my PATH and JAVA_HOME variables.
After this I start a new command prompt and type java -version, and I see the list below, but I don't see java version "14.0.1", why not?
java version "1.8.0_251" Java(TM) SE Runtime Environment (build 1.8.0_251-b08)
Java HotSpot(TM) 64-Bit Server VM (build 25.251-b08, mixed mode)
I already checked this post.
when you add a new version of Java to your PATH to use it as default you should also make sure that it is the only one in your PATH.
in this case, you already had Java 8 in your PATH and it was being used as default instead of the new Java 14, so the solution is to remove Java 8 from the PATH.
Related
I use macOS Sierra. When I do:
java -version
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-468-11M4833)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-468, mixed mode)
it seems that my java version is 1.6.0.
But when I look at System Preferences I find that my version is Java 8 Update 144. I want to use an R package that needs Java >=8.0. What have I done wrong?
The Java found in your command line is the one used to compile when using command line, first, try export JAVA_HOME=$(/usr/libexec/java_home -v 1.8) then check if the correct version shows up using java -version if not reinstall the newest java and run the command again
JShell is a REPL for Java. To use additional classes outside the default JRE it contains a /classpath command to add a path to the current classpath.
Is there however a way to view the current classpath within the JShell environment?
Note that I'm using the following early release:
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+111)
Java HotSpot(TM) 64-Bit Server VM (build 9-ea+111, mixed mode)
The /env command, without arguments, will list your environmental settings, including classpath.
I recently updated my java version to "Java 8 update 77".
As far as i know, this is the newest version...
My Java Control Panel prints the same information,
but when i switch to terminal to verify the java version:
java -version
it outputs:
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)
When i type:
/Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java -version
it prints correctly:
java version "1.8.0_77"
Java(TM) SE Runtime Environment (build 1.8.0_77-b03)
Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode)
So, did i anything wrong?
Why are there two different versions listed ?
Thanks and Greetings!
When Java is updated, it doesn't override the older version. It keeps the older version and also installs new version.
You have to change your $JAVA_HOME environment variable if you want to use new version.
This Link May help
Open the terminal. Type...
nano ~/.bash_profile
Search for export JAVA_HOME. When you find the line, comment it out by placing a # in front of the line.
Type on the next line...
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_77.jdk/Contents/Home
assuming that is where the jdk is. Press ctrl+o, ctrl+x.
Type source ~/.bash_profile. And you should be all set.
The second option that you have written about is where you are checking the java applet plugin version which does not need to be the same as the jdk runtime environment.
To make your .bash_profile future proof, you can try this
export JAVA_HOME="$(/usr/libexec/java_home)"
I setup Java 6 to be used by all other application. Normal setup with JAVA_HOME, JRE_HOME, etc. This is working fine.
I have another application that needs Java 7. I downloaded Java 7.exe and extraced tools.zip from it to a folder. Now I am trying to check the version going to the bin folder. When I type in java -version, I get the following error.
error occurred during initialization of vm
java/lang/noclassdeffounderror java/lang/object
where as java -fullversion shows Java 7. It looks like even though I am in the bin folder where Java.exe exists, it still getting the one from PATH?!?!
How do I use the java.exe from a folder ignoring the one from PATH?
You need much more than java to run java. You need all the rt.jar and lib which come with Java. It sounds like you are missing some part of the JRE or it can't find your JRE.
I suggest you re-install the version you need and run it using the full path name like
c:\>"c:\Program Files\Java\jdk1.7.0_60\bin\java" -version
java version "1.7.0_60"
Java(TM) SE Runtime Environment (build 1.7.0_60-b19)
Java HotSpot(TM) 64-Bit Server VM (build 24.60-b09, mixed mode)
c:\>"c:\Program Files\Java\jdk1.8.0_45\bin\java" -version
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)
By using the full path name you can use any specific version from any directory.
Eclipse complains: JRE version is 1.6.0; version 1.7.0 or later is needed to run Google Plugin for Eclipse.
In the Terminal, java concurs:
> java -version
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)
But in System Preferences \ Java \ the Java Control Panel says Your system has the recommended version of Java: Java 7 Update 51
and points to /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java.
Eclipse preferences show that the installed JRE is at:
/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
To point Eclipse to Java 7 (1.7.0), it's enough to change the preference:
What is the source of the discrepancy in Java versions? Is this an instance of having different PATHs between the command-line Mac and the windowed-Mac?
Edit
If I edit /usr/local/adt-bundle-mac-x86_64/eclipse/Eclipse.app/Contents/MacOS/eclipse.ini by adding
-vm
"/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java"
Eclipse refuses to start.
And yet this is indeed 1.7:
> "/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java" -version
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
If you want to be certain of the JVM that is used to run Eclipse, you need to specify it in your eclipse.ini file, according to these instructions.
Installing this update might fix your problem:
http://support.apple.com/kb/dl1572