升级到Java8后，javac仍显示1.7

Question

I'm having issues upgrading from JDK 1.7 -> 1.8 on OSX. The upgrade has completed, but javac still returns 1.7 as the version.

I've downloaded JDK 8_u5 from Oracle's homepage, and run the installer.

I've also taken the following steps, post-install:

> export JAVA_HOME=`/usr/libexec/java_home -v 1.8`  (Executed in my .bashrc file)

> echo $JAVA_HOME
/Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home

> javac -version
javac 1.7.0_21

> $JAVA_HOME/bin/javac -version
javac 1.7.0_21

> $JAVA_HOME/bin/java -version    
java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)

I've gone through and removed Java 1.7 (and all other JDK versions), and then re-run the installer:

> ls /Library/Java/JavaVirtualMachines
jdk1.8.0_05.jdk

Still no use, javac reports the version as 1.7.0_21

> which javac
/usr/bin/javac

> ls -ltra /usr/bin/javac 
[snipped] /usr/bin/javac -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javac

Within that path, Current is a symlink to A . The contents of A/Commands are a series of files (not symlinks).

> cd A/Commands
> ./javac -version
javac 1.7.0_21

> ./java -version
java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)

Edit

Further to the original post, I've done some digging with jenv , as suggested on this answer .

> jenv add /Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home                 
> jenv global oracle64-1.8.0.05
> jenv version
oracle64-1.8.0.05 (set by /Users/martypitt/.jenv/version)

> jenv info java 
Jenv will exec : /Users/martypitt/.jenv/versions/oracle64-1.8.0.05/bin/java

> jenv info javac
Jenv will exec : /Users/martypitt/.jenv/versions/oracle64-1.8.0.05/bin/javac

> javac -version
javac 1.7.0_21

This casts dispersions on my thoughts that this was a random javac lurking in my path, which was somehow getting invoked.

To be sure, I've nuked my Java completely, and tried again:

> cd /Library/Java/JavaVirtualMachines
> ls 
jdk1.7.0_55.jdk 
jdk1.8.0_05.jdk
> sudo rm -rf *  
> ls
<<empty>>
> java -version
java version "1.6.0_65"
> javac -version
javac 1.6.0_65
> which javac
/usr/bin/javac

I then re-downloaded a fresh copy the installer and ran it.

> java -version
java version "1.8.0_05"
> javac -version
javac 1.7.0_21

Update

I tried removing all JDK's, XCode and all developer tools, and re-installed fresh. Same results.

However, I'm still at a loss -- where do I go from here? How do I get javac 1.8 to get installed?

Answer 1

If /usr/libexec/java_home -v 1.8.0_05 --exec javac -version returns the correct version, then your problem is with:

/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK

With a privileged user execute:

cd /System/Library/Frameworks/JavaVM.framework/Versions/
rm CurrentJDK
ln -s /Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/ CurrentJDK

Solution found in Mankeh Blog

---

Also check this answer on Super User for dynamically switching JDK versions.

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Update: I guess I've found the culprit!

Try this:

rm -rf ~/Library/Java/Extensions
sudo rm -rf /Library/Java/Extensions

Solution found in: Java 1.7 on OSX 10.9.2 running as 1.5?

Answer 2

For Windows users:

It is possible, that you have to change your PATH variable. Try to set your "%JAVA_HOME%/bin" as the first entry in the PATH.

So now it looks like this:

 PATH    C:\Program Files\anyprogram;C:\Program Files\...;%JAVA_HOME%\bin

And you change it like this:

 PATH    %JAVA_HOME%\bin;C:\Program Files\anyprogram;C:\Program Files\...

Reason: Any other Program initiates an other Java Version first.

Answer 3

This is (most likely) a bug in the installation process of jre8 .

I am getting the exact same behaviour when navigating to my jre8 folder, which is the one which Windows (in my case) shows by default:

• java version: 1.8.0, runtime environment 1.8.0-b132, hotspot 64-bit JVM 25.0-b70
• javac version: 1.7.0_25

When navigating to the jdk8 directory, it shows the following:

• java version: 1.8.0, runtime environment 1.8.0-b132, hotspot 64-bit JVM 25.0-b70
• javac version: 1.8.0

I did just now notice though that the jre does never ship an javac , so this is an issue in the reference settings in the operating system then I guess.

To fix it, you would need to manually fix the javac reference in your OS.

Answer 4

Maybe you can delete the standard .jar file which in your classpath. When i delete the jar in /Library/Java/Extensions , the problem will be solved. More info : Java compilation error: Mac

Answer 5

Just adding my own experience here, I installed jdk-8u131-macosx-x64 from Oracle. Everything worked perfectly. No JAVA_HOME environment variables were present or needed.

mehboob$ javac -version
javac 1.8.0_131

mehboob$ java -version
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

The /System/Library showed this:

mehboob$ ls -l /System/Library/Frameworks/JavaVM.framework/Versions/
total 64
lrwxr-xr-x  1 root  wheel   10 Oct 17  2013 1.4 -> CurrentJDK
lrwxr-xr-x  1 root  wheel   10 Oct 17  2013 1.4.2 -> CurrentJDK
lrwxr-xr-x  1 root  wheel   10 Oct 17  2013 1.5 -> CurrentJDK
lrwxr-xr-x  1 root  wheel   10 Oct 17  2013 1.5.0 -> CurrentJDK
lrwxr-xr-x  1 root  wheel   10 Oct 17  2013 1.6 -> CurrentJDK
lrwxr-xr-x  1 root  wheel   10 Oct 17  2013 1.6.0 -> CurrentJDK
drwxr-xr-x  8 root  wheel  272 Sep  9  2014 A
lrwxr-xr-x  1 root  wheel    1 Oct 17  2013 Current -> A
lrwxr-xr-x  1 root  wheel   59 Oct 17  2013 CurrentJDK -> /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents

While the /Library/Java had this:

mehboob$ ls -l /Library/Java/
total 8
drwxrwxr-x  2 root  admin   68 Oct 17  2013 Extensions
lrwxr-xr-x  1 root  wheel   48 Oct 17  2013 Home -> /System/Library/Frameworks/JavaVM.framework/Home
drwxr-xr-x  3 root  wheel  102 Jun  9 11:43 JavaVirtualMachines

There was nothing in Extensions, while JavaVirtualMachines only had the jdk1.8.0_131.jdk folder.

This shows that a default installation of JDK works properly with no extra configuration required.

Answer 6

Firstly, you need to download and then install the jdk8( http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html )

Secondly, do some check as follows: Does your system have a not-linked-for-shell use java 8 already? Try this in you terminal (yes, the apostrophes are important):

$ '/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java' -version 

if it shows " java version "1.8.0_131" " , and then you can go to next step.

my screenshot

Thirdly, edit the bash_profile:

$ vi ~/.bash_profile 

and type this:

JAVA_HOME="/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home"
PATH=$JAVA_HOME/bin:$PATH
CLASSPATH=.:$JAVA_HOME/lib
export JAVA_HOME
export CLASSPATH 

save it and quit, then

source ~/.bash_profile 

After the above steps, and check the java version

$ java -version
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)