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.
Related
When I do ant -version on command line, it says not recognized. Any ideas on how to fix? I'm trying to make a build.xml for a Java project.
You have set JAVA_HOME and ANT_HOME as User environment variable. The path you set is in System environment variable.
You can fix it by many ways. One way will be to define JAVA_HOME and ANT_HOME in System Environment setting.
Another way will be to modify PATH variable in user environment section.
Make sure your JAVA_HOME and ANT_HOME and PATH are set correctly.
ANT_HOME is used by the launcher script for finding the libraries.
JAVA_HOME is used by the launcher for finding the JDK/JRE to use. (JDK is recommended as some tasks require the java tools.) If not set, the launcher tries to find one via the %PATH% environment variable.
PATH is set for user convenience. With that set you can just start ant instead of always typing the/complete/path/to/your/ant/installation/bin/ant.
Set these variables correctly and open a new cmd window (don't use old cmd window, please open new window)
type echo %PATH% , should show java and ant
Open command window(cmd) and type
java -version
If this shows java version , this means java is in your path and working.
finally type ant -version
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.
I want to use elastic search with my PHP application.
after running service install command , I am getting fallowing error.
C:\elasticsearch-0.90.10\bin>service install
JAVA_HOME points to an invalid Java installation (no java.exe found in "C:\Progr
am Files (x86)\Java\jdk1.7.0_25\bin"). Existing...
Open up and Look into the service.bat file:
It searches for:
%JAVA_HOME%\bin\java.exe
hence your %JAVA_HOME% should not include bin in it.
A workaround if you do not have privileges to set up the environmental variables:
open the service.bat file,
a) Remove the line:
if NOT DEFINED JAVA_HOME goto err
b) Replace %JAVA_HOME% with your java jdk path, something like: C:\Program Files\Java\jdk1.7.0_51
Note: This is just a workaround which works all the time.
from your error message we can see your JAVA_HOME points to
C:\Program Files (x86)\Java\jdk1.7.0_25\bin
while it should point to
C:\Program Files (x86)\Java\jdk1.7.0_25
I think the error message is fairly descriptive , you should look in this folder
is java.exe there ? If not then your JAVA_HOME environment variable to point to the correct installation
heres a page showing how to do that
https://confluence.atlassian.com/display/DOC/Setting+the+JAVA_HOME+Variable+in+Windows
1st hit on google.
Either JAVA_HOME points to the wrong location or you don't have Java installed. Check and see if there's an install of Java in the location specified.
Also note that the JAVA_HOME variable should point to the root of the Java install not the /bin folder. This is being added by the program you're executing.
To change the JAVA_HOME variable to test further use the following in the command prompt:
set JAVA_HOME=c:\xxxx
Once you've established the correct value to use this can be permanently changed in Control Panel>>System>>Advanced System Settings>>Advanced>>Environment Variables
set JAVA_HOME=C:\Program Files (x86)\Java
Above must fix the issue, I came across the same issue while installing the elastic search.
i gave a try by giving "bin" part of path but it did not work, so i just give the top folder "java" in path, it worked.
Just to add my own experience.
i was setting JAVA_HOME using tab autocompletion.
It ends up something like "C:\Program files...:" and it didn't work saying that it cannot find the java program. I solved typing the JAVA_HOME path in the set command without using tab completion. The problem was probably related to the " in the env variable
OK, what am I doing wrong, this is driving me nuts.
I am trying to install the latest JDK (1.6.0_23). So, I downloaded it from Oracle's awful site and then ran the installation. I installed it to C:\Java\jdk1.6.0_23
Then, I created a JAVA_HOME User Variable that pointed to C:\Java\jdk1.6.0_23. I then added a piece to the end of my Path environment variable that says %JAVA_HOME%\bin.
However, when I try to simply open a command prompt and run simple java commands, I am told it is not a recognizable command. I have to manually cd into the that bin directory to do anything.
Do I also need a Classpath variable that points to the JRE? I noticed there was a Classpath variable there previously that pointed to jre/lib/QTJava.zip, but I deleted it.
If you have the JDK installed and a JAVA_HOME variable setup, do I still need the JRE in the classpath? I am running Windows 7 and do all of my development in Eclipse.
Maybe the problem is because you set JAVA_HOME as a user variable, but trying to reference it from the PATH which is a system variable (or is it?). You cannot do this, because system variables are evaluated before user variables.
There are two possible solutions:
1. Set JAVA_HOME as a system variable instead
2. Create a new user variable PATH and set %JAVA_HOME%\bin there. The user PATH and the system PATH variables will be concatenated at runtime automatically.
From http://social.answers.microsoft.com/Forums/en-US/vistainstall/thread/48b23109-9fbc-47c5-a5d1-465773f94704
(at the end)
1) Enable 'delayed variable expansion'
in the registry (see
http://batcheero.blogspot.com/2007/06/how-to-enabledelayedexpansion.html)
2) Change the '%' signs around var2 to
'!', e.g. "%var2%" becomes "!var2!"
I've done some limited testing on
Windows 7 and this appears to fix the
problem.
Maybe try that, see if it fixes it (I don't have windows here to try)
Do I also need a CLASSPATH variable that points to the JRE?
Strictly speaking, no. The CLASSPATH variable may be used if you try to run a java class and you don't use the -cp or -jar options.
The CLASSPATH variable doesn't need to point to the JRE. The java.exe command etc all know where to find the JRE's runtime classes. (And they don't look on the CLASSPATH for them anyway.)
For the PATH problem, try running:
C:\Java\jdk1.6.0_23\bin\java.exe -version
If that doesn't work then there's a problem with your actual installation. If it does work, try looking at what JAVA_HOME and PATH are set to in the environment variables of the command shell.
What can I do when I keep receiving the error
'javac' is not recognized as an internal or external command, operable program or batch file
when I want to compile my jar or .class file?
Thanks
Make sure %JAVA_HOME%/bin is on your %PATH% (or $JAVA_HOME on the $PATH in *nix).
It means that it is not in your path. You have the following options:
1) Change to the directory where javac lives before calling it.
2) Use the full path to javac when making the call, e.g. C:\java\jdk1.6.0_12\bin\javac ...
3) Add the javac directory to the PATH environment variable
This just means that javac isn't in your PATH variable.
On Windows, you just have to add the folder that contains javac.exe to the PATH environment variable (Win+Pause/Break).
On Linux/Mac/Unix, just append that directory to $PATH in .bashrc or similar.
The error that you are seeing is generated by Windows, and isn't specific to Java. That error means that you typed a command and Windows could not find the command by that name.
The easiest way of rectifying the situation is to ensure that Java is properly installed in your system's PATH.
First, ensure that you have a JDK installed (and not just a JRE). Your next best bet is to add an environment variable called JAVA_HOME and point it at the base install directory for the version of Java that you installed.
Next, modify your PATH environment variable by prepending the string %JAVA_HOME%\bin; to whatever is already in your PATH. If you look at the contents of that directory, you will see that javac is in there (along with a number of other Java development tools).
You have to install JDK (which includes javac compiler) and ensure that it's in the path. See http://java.sun.com/javase/downloads/index.jsp
Common Error Messages from SUN Tutorial page
Step 4 (Update the PATH variable) of the JDK installation instructions explains what you should do to make it so that you can just type javac in the command prompt window.
The link below gives a step by step explanation on how to set up java_home and path variables.
JAVA_HOME setup
Even if I had
JDK installed
JAVA_HOME defined
%JAVA_HOME%\bin present in my %PATH%
I still had this error. I resolved it by eliminating the JRE from my path variable. It was put before JAVA_HOME, has no javac. It seems Windows can't find javac in JAVA_HOME\bin in this case.
For Windows
Control Panel > System...Then click Advanced System Setting (left pane)...then popup window will open...then click Environment Variables...Then another window will open...click New and add enter information below
Variable name: PATH
Variable value: C:\Program Files\Java\jdk1.7.0_45\bin [*make sure this is the right path for you]
Then it should work
Check whether you have JDK installed; if not installed, Install
If JDK is installed, navigate into the bin folder of the installation, and try to execute javac.
If javac executes, proceed (+:
If javac does not execute, check your system path, and java path, and return to 2 above!