I was trying to setup a workspace for modding in Minecraft, and got a error stating that my JAVA_HOME directory was not found. After messing around and installing a new JDK, running Eclipse states that:
"A Java Runtime Enviroment (JRE) or Java Development Kit (JDK)" must be avaiable in order to run Eclipse. No Java virtual Machine was found after searching the following locations: C:\Users\|My Username|\Desktop\Eclipse\jre\bin\javaw.exe
javaw.exe is your current PATH"
I was checking my PATH and JAVA_HOME variables, which where both set to C:\Programm Files(x86)\Java\jdk1.8.0_51
The file eclipse is looking for is the standart directory where java stores its javaw.exe, i.e Java\jdk1.8.0_51\jdk\bin\jawaw.exe, but Eclipse is somehow thinking my path is set to the Eclipse installation directory. Does anyone know how to fix this issue?
It is a bad idea to have JAVA_HOME set to a folder in "c:\program files..." because of the space in the folder name. Whenever this value is used as a command line argument, the receiver would interprete it as two arguments ("C:\program" and "file...").
Move your jdk into a folder without space in the name, and correct your JAVA_HOME variable.
BTW: eclipse resolves first the system PATH variable in order to find a suitable java SDK. It's a good practice, to declare the desired SDK in the eclipse.ini file (in eclipse install-folder). Add there an argument:
....
-vm
C:\JDK8\bin\javaw.exe
-vmargs
-Xms40m
-Xmx384m
Note that the -vm arg and its value must appear on separete lines and must be placed just before the -vmargs argument.
Related
This question already has answers here:
javac is not recognized as an internal or external command in windows 7
(3 answers)
Closed 2 years ago.
My current system config is -
Netbeans 12.0
JDK 14.0.2
Windows 10 (64bit)
I have added the environmental variable in PATH manually i.e. C:\Program Files\Java\jdk-14.0.2\bin.
I tried adding using cmd as well. As well as adding the JAVA_HOME as a new variable with value as C:\Program Files\Java\jdk-14.0.2 .
I have used the set command to do this process i.e. set path = "%path%;"C:\Program Files\Java\jdk-14.0.2\bin". Also, I have used the same command without the set keyword.
Since javah command was deprecated for versions of jdk>8, I have tried to use javac -h command as well.
I have also tried to install JDK v. 8.0.2 instead of the current one.
Although there's no javah.exe file in the bin folder, there is however javac.exe file.
I have uninstalled and reinstalled JDK and Netbeans quite a few times.
I am currently working on JNI with Netbeans IDE and C/C++ plugin. (I have successfully installed Cygwin and necessary extension for the file to build. Although I don't know how they affect this problem, still I thought I should add this).
The command I wish to use with 'javah' is the one used for creating a C header from a Java class i.e. 'javah -o JNIDemoJava.h -classpath JNIDemoJava/build/classes jnidemojava.Main'.
But due to this error, I have been stuck for a few days. Please do assist.
Following way you can set Path variable temporary(it can only be used in the same command line):
You should do it this way:(notice =)
set PATH=C:\Program Files\Java\jdk-14.0.2\bin
And if you set JAVA_HOME variable correctly you can do it this way:
set PATH="%JAVA_HOME%\bin"
For setting this permanently read this post :
https://javatutorial.net/set-java-home-windows-10
We should know the reason for this
Our OS comes with a predefined (built-in)set of tools and utilities. When we try to execute the command e.g. cls in the Windows command line then it is already present in system path variable and os will refer the corresponding binary of cls to execute the command.
However, when we install any third party tool/software then path variable is not updated accordingly.
When we install different versions of java on your system then installations go to different directories. E.g. JDK installation directory for Windows will be
C:\Program Files\Java\jdk1.8.0_161
Similarly, JRE installation directory for Windows will be JDK installation directory for Windows will be
C:\Program Files\Java\jre1.8.0_161
We need to update the path variable of OS to point to the appropriate directory. If we set the path of JDK then it will execute a binary from JDK bin directory.
Solution
we need to update JDK or JRE version specific directory location into PATH Environment variable.
In this case use
set path=C:\Program Files\Java\jdk-14.0.2\bin to set JAVA_PATH
I have installed Java 8 and set my JAVA_HOME and JRE_HOME paths and added %JAVA_HOME% to the start of the path variable.
I created a helloworld.java application and am able to compile it using:
javac helloworld.java
However, when I try to run:
java helloworld
I get the error:
The system cannot find the file C:\ProgramData\Oracle\Java\javapath\java.exe
How can I solve this?
1.Just go to C:\ProgramData\Oracle\Java\javapath\
2.You will find there shortcuts for java.exe,javaw.exe,javaws.exe which are pointing to a location where they actually are not existing now
3.Go to the jre location where you have installed java like C:\Program Files\Java\jre6\bin
You will find java.exe,javaw.exe,javaws.exe
Create shortcuts for these files and replace with the ones which are present in C:\ProgramData\Oracle\Java\javapath.
It works
Just set %JAVA_HOME%/bin to your path variable.
If you are blocked from modifying system variables from command line, but are able to open up an elevated command prompt, then run a command like this:
setx \M JAVA_HOME "C:\Program Files\Java\jdk1.8.0_25"
But of course, change the directory to point to your installed version of java. Note that the JAVA_HOME path does not point into the bin directory, it stops one level above bin.
I was able to solve this issue. To do so I used the advice from this answer:
Java SE Development Kit 8u25 on a 64-bit Windows 8
Set the following user environment variables (== environment variables of type user variables)
•JAVA_HOME : C:\Program Files\Java\jdk1.8.0_25
•JDK_HOME : %JAVA_HOME%
•JRE_HOME : %JAVA_HOME%\jre
•CLASSPATH : .;%JAVA_HOME%\lib;%JAVA_HOME%\jre\lib
•PATH : your-unique-entries;%JAVA_HOME%\bin
(make sure that the longish your-unique-entries does not contain any other references to another Java installation folder.)
Others have asked this question but the answer is usually the same and not helpful to my problem. I installed JDK, and added C:\Program Files\Java\jdk1.7.0_25\bin to the path system variable. I checked, jps.exe is in that directory. I restarted my computer but still have had no luck. When I run jps I get the error:
'jps is not recognized as an internal or external command, operable command or batch file'
When I run C:\Program Files\Java\jdk1.7.0_25\bin\jps.exe on the command line it works fine. Working in Windows 7.
Mildly obvious mistake, but I realize that I had spaces in between the directories in my path and that caused them to not be recognized. So I had %OTHER_PATH%; C:\Program Files\Java\jdk1.7.0_25; %ANOTHER_PATH%, which I just had to switch to %OTHER_PATH%;C:\Program Files\Java\jdk1.7.0_25;%ANOTHER_PATH%
Your JDK bin directory does not exist in PATH variable.
To add this you need to do below steps.
Go to "Control Panel >> System >> Advanced system settings >>
Environment Variables
Click 'Path' from System variables
Click Edit.
Now add the path "C:\Program Files\Java\jdk1.8.0_72\bin"
Now open command window and write jps. It will work now.
In addition to the above solutions, still if you have issue with jps command, Please check whether the default system installed java(JRE) path is already available in the Path variable.
My case i faced the same issue and observed the following path already available in the path variable.
"C:\Program Files (x86)\Common Files\Oracle\Java\javapath"
So I had to change the position(move up) of my new JAVA_HOME path, new JAVA_HOME path is above the default oracle javapath.
I'm new to java and eclipse. I even saw this type of query on this website. But I have applied all those methods and it was also helpful. But when I try to open eclipse, it is not opening:
This is my path for java
C:\Program Files (x86)\Java\jre6
this is where my eclipse is
C:\Users\New folder\eclipse
But when I run the eclipse I'm getting an error
"A java rumtime environment(JRE) or java development kit(JDK) must be
available in order to run eclipse. No java virtual machine was found
after searching the following location: C:\Users\New
folder\eclipse\jre\bin\javaw.exe javaw.exe in your current path"
Please tell me the possible solution.
Thanks in advance!
If you have installed jdk then Eclipse won't have any issue to start. I think you just have installed JRE to run java programs. You need to install JDK.
To check whether you have installed JDK. Check Path C:\Program Files (x86)\Java. Your Java directory should contain directory jdk1.6.., If you don't have this directory there, search it at other places. If you did not find directory then you didn't install JDK.
Download JDK from here.
You should set JAVA_HOME and JRE_HOME variable. http://www.javawebonline.com/java-se-programming/beginners/java_home-jre_home-environment-variables/
And another suggestion is you should move your java home to another location and test your path to java such as
C:\Java\jre6
instead of
C:\Program Files (x86)\Java\jre6.
Go to C:\Users\New folder\eclipse
Open eclipse.ini file with text editor and add the javaw location there
( right after -vm part ) like so:
-vm
C:/Program Files/Java/jdk1.6.0_33/bin/javaw.exe <--- change to your path
-vmargs
Open the command prompt by pressing Windows+r, type cmd and press Enter.
Type javac and check the output.
If it gives all the options and usage, then you have configured the PATH vairables correctly, or else you have not set them up correctly.
Try it by checking the value at the command prompt.
NOTE
You need to open a new command prompt each time you change the environment variables.
If you have two Program Files folder in your C: drive
such as
C:\Program Files
C:\Program Files (x86)
then try to put your java inside
C:\Program Files
instead of C:\Program Files (x86)
It seems you are running 64 bit eclipse in 64 bit operating system. If you are running 64 bit eclipse then you need 64 bit JDK. Please install 64 bit JDK and run eclipse.
When running an ivy resolve via IvyDE in Eclipse, which contains a packager.xml that executes a javac ant task, I get the following:
Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the
classpath. Perhaps JAVA_HOME does not
point to the JDK. It is currently set
to "C:\Program
Files\Java\jdk1.6.0_22\jre"
at org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.getCompiler(CompilerAdapterFactory.java:108)
In eclipse.ini I have
-vm
C:\Program Files\Java\jdk1.6.0_22\bin\javaw.exe
and in Help - About Eclipse - Installation Details - Configuration I see
java.home=C:\Program Files\Java\jdk1.6.0_22\jre
How can I make java.home point to C:\Program Files\Java\jdk1.6.0_22 instead?
Eclipse uses its own javac implementation internally. Therefore for most of the purpose you just need a compatible JRE. But javac task in ANT considers the JAVA_HOME or check for the local path variable. On windows machine as temporary fix you can do:
Open a command prompt
then type
SET path=C:\Program Files\Java\jdk1.6.0_22\;%path% hit enter
then type
<eclipsehome>\eclipse.exe
Now any process spawned from your eclipse will have your JDK version in the path variable.
for a permanent solution..
1. go to advance system setting
2. select advanced tab
3. select environment variables
4. modify the system path variable and JAVA_HOME (if required)
You can do the similar thing for *nix system (just check how to set environment setting on them)
Hope this will work.
UPDATE
The PROJECT classpath isn't the same as the ANT classpath. To set up an Ant classpath, navigate to window->preferences->ant->runtime here check whether the Global Entries points to C:\Program Files\Java\jdk1.6.0_22\lib\tools.jar if not then add it. Normally it works in most of the cases where ant cries for javac task. if it fails then please check whether some other script is not resetting your JAVA_HOME variable and ANT global entries setting.
If IvyDE is not using the ANT bundled with eclipse as plugin (and referring to some standard installation) or if you have defined a environment variable like ANT_HOME then copy
tools.jar file from C:\Program Files\Java\jdk1.6.0_22\lib\ to ANT_HOME\lib.
Also check this previous SO post ( Ant can't find Javac. No matter what I do it always claims JAVA_HOME is "C:\Program Files\Java\jre6" )
UPDATE 2
ok..
Check this page... http://ant.apache.org/ivy/ivyde/history/latest-milestone/preferences.html
Order of the classpath entries: By
default, the classpath container
entries are ordered by order of
declaration in the ivy.xml. When there
are many entries, it can be useful to
have them ordered lexically for
enhanced readability.
Is tools.jar present in ivy.xml? please check once.