The thing is i have jdk1.6.0_45, jdk1.7.0_09 installed on my computer.
Normally i use JDK7 as my work environment with following system variable setting:
JAVA_HOME=C:\Program Files\Java\jdk1.7.0_09;
classpath=%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;
path=%JAVA_HOME%\bin;
And when i execute java -version in cmd, it displays the version correctly:
java version "1.7.0_09"
Java(TM) SE Runtime Environment (build 1.7.0_09-b05)
Java HotSpot(TM) 64-Bit Server VM (build 23.5-b02, mixed mode)
Here i encounter a problem, i need to switch to JDK6 for another project. So i changed system variable JAVA_HOME to C:\Program Files\Java\jdk1.6.0_45, i supposed that it should works for the new setting. But actually not, when i executed java -version, it still shows the currently using jdk is 1.7.0_09.
Is this alright?
Finally i found what the problem is.
There is a java.exe(which is jdk7) under system32 folder.
The full path system variable is path=C:\Windows\system32;%JAVA_HOME%\bin;. Which means the unexpected java7 will always be the selected version on my computer even i have specified another version(like jdk6). It might came along with some browser plugin/applet. When i removed this java.exe, everything goes fine.
Related
its showing below details while checking 'java -version' in CMD
java version "11.0.15" 2022-04-19 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.15+8-LTS-149)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.15+8-LTS-149, mixed mode)
I am getting below response in Eclipse while using 'System.getProperty("java.version")'
Java Version is: 17.0.2
The CMD uses the PATH environment variable to search for executables (java.exe). The executable is searched in the directories listed in that variable, in the given order. The first one found, is the one that is executed.
Eclipse uses its own settings:
the JRE used to start Eclipse can be specified in the eclipse.ini file; if not specified there, the OS default will be used (usually the same as the CMD, see above);
the JRE used to execute an application inside Eclipse, is specified by the Run/Debug configurations (Run-Run Configurations.../Run-Debug Configurations...), the respective project properties (Project-Properties) and Eclipse preferences (Window-Preferences-Java-Installed JREs).
When I chose "Use Default Workspace JRE" inside Java Build Path->JRE System Library it is showing Java 11.0.15 in eclipse
Recently I copied Netbeans 8.2 to new computer and unfortunately the java path are different from previous. My machine running on Windows 10 x64. And when I running netbeans64.exe on bin folder than two popups appear
cannot locate java installation in specified jdkhome:C:\Users\root\Workspace\root\idk\java\jdk\1.8\bin\
After that, I choose to use default version, than another popup appear
cannot find java 1.8 or higher
I've follow instruction to change on /etc/netbeans.conf as below
netbeans_jdkhome="C:\Users\root\Workspace\root\idk\java\jdk\1.8\bin\"
But it doesn't works. I can assuring you that inside the folder contains java.exe which is version 1.8
java version "1.8.0_152"
Java(TM) SE Runtime Environment (build 1.8.0_152-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.152-b16, mixed mode)
I had registered that path above on System Environment Variables
I have tried to use parameter --jdkhome but still got the same result.
What wrong with my Netbeans? Any other suggestion?
Thanks
jdkhome should point to the root of the JDK folder, not the bin folder inside it.
So it should be:
netbeans_jdkhome="C:\Users\root\Workspace\root\idk\java\jdk\1.8\"
or
--jdkhome C:\Users\root\Workspace\root\idk\java\jdk\1.8
I want to make a python-android-app using this software. I have installed java JDK, when i run java -version i get:
java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)
However running the line python android.py installsdk from witin rapt directory (as described in the tutorial) tells me that i have no JDK:
I'm compiling a short test program, to see if you have a working JDK
on your system.
I was unable to use javac to compile a test file. If you haven't
installed the Java Development Kit yet, please download it from:
http://www.oracle.com/technetwork/java/javase/downloads/index.html
The JDK is different from the JRE, so it's possible you have Java
without having the JDK. Without a working JDK, I can't continue.
You need to set your jdk to be accesible, and within path / java home :)
Here help from google:
To set JAVA_HOME environment variable, do the following: Launch
Terminal by pressing Ctrl + Alt + T on your keyboard. Depending on
where you installed your Java, you will need to provide the full path.
For this example, I installed Oracle JDK 7 in the
/usr/lib/jvm/java-7-oracle directory.Aug 13, 2012
I have problem to use maven from ubuntu server 13.10 64bit.
I am getting following error (even when I type mvn -version):
Error: JAVA_HOME is not defined correctly.
We cannot execute /usr/lib/jvm/jdk//bin/java
But when I type java -version I get:
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)
I have no idea where can be the problem, especially because I have used maven without any problems before I've installed hadoop 2.2.
Thank you in advance for any help.
It appears that the Hadoop instructions and/or start up script modifies the JAVA_HOME environment variable in the shell.
Unless this change is made permanent by changing one of the many configuration files - like $HOME/.profile - it only influences the shell in which you have observed the problem.
I am trying to setup Android build environment for my Mac 10.8.3
I dont understand, Apple provide instructions on how to revert mac back to Java 1.6 here :
http://support.apple.com/kb/HT5559?viewlocale=en_US&locale=en_US
They are clear instructions that I followed.
Yet when I still get the following :
unknown-98:fe:94:3f:92:ce:~ newuser$ java -version
java version "1.7.0_13"
Java(TM) SE Runtime Environment (build 1.7.0_13-b20)
Java HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode)
Please please help me solve this problem.
The Mac comes with, and occasionally updates, JDKs 1.4 through 1.6. You can see the versions you have installed in this directory:
/System/Library/Frameworks/JavaVM.framework/Versions
This is how you change the JDK
1. Command Line Java
My Java is coming from /usr/bin/java, which points off to one of the versions in the 'Versions' dir described above. To change the version of the JDK you're getting here, use the Java Preferences application under Applications -> Utilities -> Java:
You can drag the JDK you'd like to the top and it should be reflected immediately from the command line:
hostname% java -version
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b06-284)
Java HotSpot(TM) 64-Bit Server VM (build 1.5.0_16-133, mixed mode)
hostname% java -version
java version "1.6.0_07"
Java(TM) SE Runtime Environment (build 1.6.0_07-b06-153)
Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_07-b06-57, mixed mode)
2. Scripts and Applications That Use Java
Generally, other built-in applications or one that you install will use the JAVA_HOME environment variable to pick a JDK. By default, you won't have this set, and Mac-specific versions of startup scripts will usually create one by using the CurrentJDK link in the Java 'Versions' directory. The steps to add environment variables are documented in this article, but I can save you a little time. Create a directory .MacOSX in your home directory and add a file called environment.plist. Here are the entire contents of my ~/.MacOSX/environment.plist file:
<!-- When changing this, also run Java Preferences and change there. -->
<key>JAVA_HOME</key>
<string>/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home</string>
With this value set, all processes started as you will have JAVA_HOME available to them. Since this file is read when you log in, you'll have to log out/in once after you create or edit this file.
Special case: NetBeans
The IDE I use is NetBeans, but the following idea probably applies to other large applications as well. When NetBeans is installed, it will pick a JDK to use and hard code it in a properties file. If you want it to rely on the JAVA_HOME that you're now setting in environment.plist, you just need to edit one file. Edit this file:
/Applications/NetBeans/NetBeans\ 6.5.app/Contents/Resources/NetBeans/etc/netbeans.conf
..and you can set the JDK by changing this line:
netbeans_jdkhome=$JAVA_HOME
Note that, as the netbeans.conf file points out, you can always force a different JDK to be used by specifying it on the command line when starting the IDE. For your copying and pasting pleasure, here is the command to use to start it from terminal (I'm giving the 'help' option in this case). If you're using a different version, autocomplete ought to help with the version part of the path:
/Applications/NetBeans/NetBeans\ 6.5.app/Contents/MacOS/netbeans
--help
Recap
To recap, you can switch JDKs for your whole system by using the Java Preferences application along with changing the value in your environment.plist file. To switch on the fly, use the Preferences app and set a new value for JAVA_HOME in whatever terminal you're using, though some apps like NetBeans will still pick up the system value and you should specify the desired JDK on the command line.
Resources where I found this solution: https://blogs.oracle.com/bobby/entry/switching_jdks_on_mac