I tried the following in cl:
javac Main.java
The shell gives an error that "javac" is not a recognized command. I know for a fact I have the Java Platform installed. What could be wrong?
(I use "cd" to set the directory first)
javac is most likely not on the PATH, and you must give the full path in your command.
Add /bin folder to your environment variables.
How do I set or change the PATH system variable?
Related
I am trying to compile and a sample Helloworld.java file.
I have my jdk installed in C:\Program Files\jdk1.7\bin.
And I have my Helloworld.java in C:\Helloworld.java
I am actually a novice in both powershell and java.
I got some examples from web regarding this but many of them advice to run it like this:
java.exe -classpath $Env:CLASSPATH C:\Helloworld.java
But when I give this in powershell I get an error called 'CLASSPATH' is not defined even after adding it in env variables.
And when I try to compile the code with the following syntax:
$javac C:\Helloworld.java I get an error "javac is not recognised as a token".
So, I am literally lost in this topic . Any step by step procedure to run java programs using powershell for dummies like me will be greatly appreciated.
Setup environment variables in your system.
set JAVA_HOME to C:\Program Files\jdk1.7
add to PATH variable the string %JAVA_HOME%\bin
open new cmd session.
navigate your java source folder.
use javac to compile your java files.
UPDATE:
also if you are experiencing difficulities upon launching an executable via PowerShell check this Microsoft TechNet article
The variables you speak of do not exist in PowerShell as you name them.
The correct variable names are
$Env:JAVA_HOME: C:\jdk1.6.0;
$Env:PATH: C:\jdk1.6.0\bin;.;
$Env:CLASSPATH: C:\jdk1.6.0\lib;.;
As they all must be defined in the ENV: PSDrive
To answer it in a much simpler way , its the path problem .
You probably not have set env variables that's it.
This is how you should set it:
JAVA_HOME: C:\jdk1.6.0;
PATH: C:\jdk1.6.0\bin;.;
CLASSPATH: C:\jdk1.6.0\lib;.;
And later if you open a cmd prompt and type java -version , if you are able to see the java installed version then you are good to go.
I am new at web-services. I am trying to generate the stubs using this command:
wsimport -d ./build -s ./src -p com.ECS.client.jax http://webservices.amazon.com/AWSECommerceService/AWSECommerceService.wsdl -b jaxws-custom.xml
I am getting this error in the cmd:
wsimport is not recognized
My Java environment variable system path is C:\Program Files (x86)\Java\jdk1.7.0. What am I doing wrong?
I resolved this issue by using wsimport from netbeans not from cmd...but I still don't know why I couldn't use it from cmd.
C:\Program Files\Java\jdk1.7.0_60\bin
This is where my jdk is, works for my system:
Go to My computer >> right click and select properties.
On the properties tab select Advanced system settings (Windows 7)
Click enviroment variables
select path and click edit option
add
";C:\Program Files\Java\jdk1.7.0_60\bin"
at the end.
Done.
wsimport and all other java commands are present in jdk bin directory and hence you need to update your PATH variable to include:
"C:\Program Files (x86)\Java\jdk1.7.0\bin"
instead of
"C:\Program Files (x86)\Java\jdk1.7.0"
I offer to create JAVA_HOME path. For example my JAVA_HOME:
JAVA_HOME c:\Java\jdk1.6.0_26\
My java path not include any special character and spacing between characters. Windows Path included this:
%JAVA_HOME%\bin;
or:
c:\Java\jdk1.6.0_26\bin;
Please check your Path. May be included wrong character, another slash, second java path or not included semicolon.
your java path is not set properly. what you can do is.
go to your java bin folder in your cmd prompt like c:\java\jdk.1.7.0\bin and enter your command like wsimport or wsimport -keep -s blahblahblah.
This will work!!!
You can also do this instead of changing the enviroment path variables
'C:\Program Files\Java\jdk1.8.0_60\bin\wsimport.exe'
And simply execute your code like:
'C:\Program Files\Java\jdk1.8.0_60\bin\wsimport.exe' -d ./build -s ./src -p com.ECS.client.jax http://webservices.amazon.com/AWSECommerceService/AWSECommerceService.wsdl -b jaxws-custom.xml
I know this is an old post but I found this solution today and this was the way I solved!
Go to the environment variable. Under system variable choose "PATH" and edit it. In the new dialog box append path till bin folder of jdk. It MUST work.
If you're on linux and can't find wsimport as a default shell command, you might want to install openjdk-devel.
Actually the problem for this issue is system is not finding the java on the path variable. Eventually the command will work after adding the java on your system path variable..
This is the best solution for this problem:
run on your cmd this line:
c:>set path=%path%;C:\Program Files\Java\jdk1.8.0_51\bin
It should work.
I found it on
http://www.skylit.com/javamethods/faqs/javaindos.html
I just delete the entry in path as %JAVA_HOME%\bin and provide the direct path as C:\Program Files\Java\jdk1.8.0_101\bin . I don't know why because previously also it was pointing to same directory only.
I'm trying to compile and run java file using the command line, but it's not working. I've followed the steps on http://introcs.cs.princeton.edu/java/15inout/windows-cmd.html, using the correct file path and a current jdk and I still get javac is not recognized when typing javac -version. What am I doing wrong?
You need to add the folder where javac exists to your PATH. It might not be the same path specified in the given link.
Please follow this link to set PATH and CLASSPATH for java in windows
I am trying to run my java program from command line.
I read an article about setting up classpath, but I get an error of javac is
not recognized as internal or external command. What should I do? (I dont want to set a permanent CLASSPATH)
This is what I have done in my command line
D:\user> set path=%path%;C:\Program Files\Java\1.7.0_07\bin
D:\user> cd testing
D:\user\testing> javac firstProgram.java
'javac' is not recognized as an internal or external command,
operable program or batch file.
Thank you
Assuming that the PATH is correct1, the most likely cause is that you have a JRE installation ... and a JRE doesn't include a java compiler. You need a JDK installation if you want to compile from the command line.
(You can confirm this by looking in the C:\Program Files\Java\1.7.0_07\bin directory to see if it contains a javac.exe file. A JRE won't ...)
Where can I find the Java compiler to download..
You need to download one of the JDK installers; see http://www.oracle.com/technetwork/java/javase/downloads/index.html
1 - I don't think quotes are required in a PATH variable on Windows. At least that's what various examples that Google found for me seem to imply. But I've never really understood the logic behind quoting in Windows ...
Its an issue related to Program Files.
First make sure that your JDK Folder is installed in Program Files or Program Files(x86) or any other folder.
Then you should use the path of bin folder in " ". Because command prompt does break the string at space. When you will write it in " " then it will take is as a whole String.
You try these commands
set path=%path%;"C:\Program Files\Java\1.7.0_07\bin"
or
set path=%path%;"C:\Program Files(x86)\Java\1.7.0_07\bin"
It might help you to get out of this.
Better do it in Environmental variable and check it!
try below command is recognized from command prompt
C:\Program Files\Java\1.7.0_07\bin\javac ab.java
This is just to verify your javac
Here's how you can set the path temporary, meaning if you close and reopen "command prompt" you will have to set the path again.
Assuming the path is C:\Program Files\Java\jdk1.6.0\bin
TYPE IN C:\Program Files\Java\jdk1.6.0\bin AND HIT ENTER
that's it.
The commands D:\user> set path=%path%;C:\Program Files\Java\1.7.0_07\bin works well for me
Adding few more information to this:
Please check the version of JDK and JRE installed on your computer. Recently I faced the same problem even after setting the PATH. It gives the error "javac - command is not recognised"
Solution is there must be similar versions of JDK as well as JRE
E.g.: JDK 1.7.75 along with JRE 1.7.75
The reason is long and boring, but I need to run an Ant script to compile Java 1.5 code from a Java 1.4 app. I keep getting this error, though:
BUILD FAILED
build.xml:16: 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:\j2sdk1.4.2_16\jre"
In my code, I have:
Project p = new Project();
p.setUserProperty("ant.file", buildFile.getAbsolutePath());
p.setProperty("java.home", "C:\Program Files\Java\jdk1.6.0_04");
p.fireBuildStarted();
p.init();
// so on and so forth
but it ignores it. I've also tried p.setUserProperty(String, String), but that doesn't do the trick, either. Is there a way to do it without launching a separate process?
Does the javac task in your buildfile have fork="yes"? If not, then it doesn't matter what the java.home property is set to; ant will attempt to call the javac Main method in the same java process, which from your error is a JRE, not a JDK.
EDIT Try setting the executable property of your javac task to the full path to the javac binary and add compiler="extJavac" to the task.
Shouldn't the backslashes be doubled?
p.setProperty("java.home", "C:\\Program Files\\Java\\jdk1.6.0_04");
Have you set environment variables JAVA_HOME and ANT_HOME properly? If you are setting via code it should work though.
Also check if your %JAVA_HOME%\bin directory %ANT_HOME%\bin should be in the environment variable 'path'.
Your problem seems to be with the %JAVA_HOME%\bin not being present in the envt. variable path though.
Another way to make this work is to add 'tools.jar' to your classpath. The javac compiler is contained within this jar.
java -cp $JAVA_HOME/lib/tools.jar ...
javac option is available in tools.jar. In eclipse, even if your JRE HOME points to a jdk, all the system libraries point to JDK_HOME\jre\lib. There is no tools.jar. You can add tools.jar as an external Jar file. This should solve your issue