On OS X 10.8.2, I'm using JNA and gstreamer-java (through the Eclipse IDE) to load gstreamer libraries. At first I installed gstreamer using the SDK provided by gstreamer.com. However, I uninstalled this and use Macports to install it.
The SDK's libs were installed to:
/System/Library/Frameworks/GStreamer.framework/Versions/0.10-x64/lib
But that directory no longer exists.
Where Macports installed the libs to:
/opt/local/lib
Now, say I want to set java to know of this location via some environment variable. Is this possible? It seems so, because running this line:
System.out.println( System.getProperty("jna.library.path"));
Shows /System/Library/Frameworks/GStreamer.framework/Versions/0.10-x64/lib. But I cannot for the life of me figure out where that got set. It's not set as a runtime VM argument. My $PATH and $DYLD_LIBRARY_PATH, $LD_LIBRARY_PATH do not have this directory set. They actually have the path I want, /opt/local/lib/ set which has no effect it seems. Running env shows no variables with the Framework path either.
So, jna.library.path. Is it set externally? How can I change it--without setting it at runtime or via java command-line arguments? Zero points for telling me to symlink.
EDIT:
Searching through gstreamer-java's files led me to gstreamer-java.spec, which has this line:
sed -i [...] -e "s,\(run.jvmargs=-Djna.library.path=\).*,\1%{_libdir}:$(pkg-config --variable=pluginsdir gstreamer-0.10),"
Running the contained command pkg-config --variable=pluginsdir gstreamer-0.10 gets me this:
/opt/local/lib/gstreamer-0.10
Which is the correct path for plugins. Further running pkg-config --print-variables gstreamer-0.10 gives me all these:
typelibdir
datarootdir
exec_prefix
pluginsdir
datadir
prefix
libdir
includedir
girdir
toolsdir
Which are all at or under the correct /opt/local/ directory.
Have you tried running outside of Eclipse?
Related
I want to run JMeter test plans from a UNIX server where env variables for java is not set. Its a test server and I dont have access to set that. We have different JDK versions and all are sitting in directories. I need to run my JMeter TestPlans on this server. I went to JDK /bin folder and tired to execute the below command
$ {jmeter-path}/bin/jmeter -nt testplan.jmx -l testresult.jtl
but this says
./bin/java: not found
But if I do simple java -version it shows the version result.Is that something that JMeter needs specifically the java env variable set or it wont run ? I dont have permission to set and I want to run the testplan using the JDK/JRE from its directories. A help would be appreciated. Thanks in advance!
UPDATE:
I think I could work around this by editing the jmeter script file as suggested in the one of the comments. Since my requirement was running the JMeter from a specific server, I could achieve this by editing the JAVA_HOME variable value in the script.
JMeter looks for java executable in system PATH so you have 2 options:
Add bin folder of your JDK or JRE to PATH, something like:
PATH=$PATH:/location/of/your/jbk/bin && export PATH && {jmeter-path}/bin/jmeter -nt testplan.jmx -l testresult.jtl
Or if you have java in PATH just run ApacheJMeter.jar like:
java -jar {jmeter-path}/bin/ApacheJMeter.jar
You might also want to use jmeter.sh wrapper script instead of jmeter, it has some logic regarding java binary location
More information: Get Started With JMeter: Installation & Tests
The official JMeter Getting Started documentation says this:
To install a release build, simply unzip the zip/tar file into the directory where you want JMeter to be installed. Provided that you have a JRE/JDK correctly installed and the JAVA_HOME environment variable set, there is nothing more for you to do.
Based on the symptoms that you reported, I think that you have not set JAVA_HOME correctly. It should be set to an absolute path to your Java installation's top directory.
I'm super new to CS and very unfamiliar with UNIX/Bash vocab.
I'm currently trying to install Maven, and I made a few mistakes by copy pasting old installation instructions (with incorrect version numbers) and now the whole process is so messed up. I first tried to follow the given instructions on the website, that didn't work, then I tried a few other ones, and now I'm worried that I'm left with a mess by following different sets of instructions.
I've reached a point now where if I type in mvn -version I get the following:
The JAVA_HOME environment variable is not defined correctly
This environment variable is needed to run this program
NB: JAVA_HOME should point to a JDK not a JRE
Originally, my JAVA_HOME was set to jdk-install-dir, which still gave me the above error message. I tried redownloading the jdk (version 13.0.1) from Oracle, dragged that file to my home directory, and unzipped it. Then I set my JAVA_HOME to that unzipped file, jdk-13.0.1.jdk, and updated my PATH variable. After all this, I'm still getting this same error message, and I'm not sure what to do.
For the reference, here are what some relevant environment variables are set to (I didn't include irrelevant info from PATH):
~ echo $JAVA_HOME
jdk-13.0.1.jdk
~ echo $PATH
/usr/local/apache-maven/apache-maven-3.6.3/bin:/opt/apache-maven-3.6.3/bin:jdk-install-dir/bin:/usr/local/apache-maven/apache-maven-3.3.9/bin:/opt/apache-maven-3.6.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/allyson/apache-maven-3.6.3/bin:/Users/allyson/apache-maven-3.6.3/bin:jdk-12.0.1.jdk/bin:/Users/allyson/apache-maven-3.6.3/bin:JDK-13.0.1.jdk/bin
~ echo $M2
/usr/local/apache-maven/apache-maven-3.6.3/bin
~ echo $M2_HOME
/Users/allyson/apache-maven-3.6.3
One thing I'm curious about: for the M2 and M2_HOME variables, is it supposed to be that one is in my home directory (/Users/allyson) and one is for /usr/local?
OK, take a deep breath, and we'll walk through this. Each of these environment variables has a purpose, and once you understand what those purposes are, this makes a lot more sense. Mixing tutorials is not necessarily a problem, but you'll want to understand what you're doing, rather than just blindly copy values from the internet.
JAVA_HOME is intended to identify to the system environment where to find a java runtime environment. It needs to be set to the full path of where your JDK has been installed. On windows, this might be C:\Program Files\Java\jdk-13.0.1. On a Linux system, you have a bit more flexibility. Common locations might be /opt/java/jdk-13.0.1 or /usr/local/java/jdk-13.0.1. If you installed your JDK somewhere else, then you need to use that path instead. The message NB: JAVA_HOME should point to a JDK not a JRE refers to a common mistake when installing maven -- maven requires a JDK, not a plain JRE. This error is so common that any time JAVA_HOME points to a folder that isn't a JDK, it prints this warning (even if the folder in question isn't actually a JRE).
M2_HOME is supposed to be set to the full path where maven is installed (i.e. the place where you unzipped it). This more or less helps maven "find itself" if it should need to for whatever reason. Strictly speaking, this one isn't necessary. (It's not set on my system, and maven works fine for me). It's mostly a convenience for setting the next environment variable.
M2 is the full path to the folder where the maven executable is. This will almost always be $M2_HOME/bin, but it's certainly possible to do weird things, and this will let you work around those situations. Obviously, this won't work if you didn't specify $M2_HOME. This one isn't strictly necessary, either, and is mostly a convenient way of setting up the next one.
PATH is where your Linux system looks to find programs to run when you type their name on the command line. For ease of use, you'll want to make sure that the maven and java executables are included somewhere in the : delimited list. Most Linux distributions already have a default PATH set up for you in a shell resource file of some kind. You'll want to refer to their documentation for how to add another entry to the path, but a common idiom would be PATH=$PATH:$M2 (which would append the value of $M2 to the value of $PATH and then store the result back into PATH. If you didn't set up $M2 or $M2_HOME, you'll need to do something else.
So, TL;DR, if you installed your JDK in /opt/java/jdk-13.0.1 and unzipped maven into /opt/maven/apache-maven-3.6.3, your bear minimum working values are:
export JAVA_HOME=/opt/java/jdk-13.0.1
export PATH=$PATH:$JAVA_HOME/bin:/opt/maven/apache-maven-3.6.3/bin
And if you wanted a complete set
export JAVA_HOME=/opt/java/jdk-13.0.1
export M2_HOME=/opt/maven/apache-maven-3.6.3
export M2=$M2_HOME/bin
export PATH=$PATH:$JAVA_HOME/bin:$M2
It's worth noting that most Java IDEs will include a GUI for setting up maven and Java within the IDE (the settings will typically only work within that IDE). It's often much easier for beginners to get up and running that way.
$JAVA_HOME should be a full path, not the dir name.
scream#kafka1:~$ echo $JAVA_HOME
/opt/java/jdk-11.0.5/
scream#kafka1:~$
I'm working on Ubuntu 20, and my own issue was about the jdk version located in the JAVA_HOME variable, which wasn't the right version. This was my trip around that issue:
First, What is the JAVA_HOME value?
$ echo $JAVA_HOME
$ /usr/lib/jvm/jdk-11.0.10
Next question/step, where is the Java app pointing to?
(Source: https://stackoverflow.com/a/42706056/2373421)
$ java -XshowSettings:properties -version 2>&1 > /dev/null | grep 'java.home'
java.home = /usr/lib/jvm/jdk-11.0.12
So, the JAVA_HOME variable wasn't keeping the right value. Let's change that:
$ export JAVA_HOME=/usr/lib/jvm/jdk-11.0.12
The test outcome is right now:
$ mvn -v
Apache Maven 3.8.1 (05c21c65bdfed0f71a2f2ada8b84da59348c4c5d)
Maven home: /opt/apache-maven-3.8.1
Java version: 11.0.12, vendor: Oracle Corporation, runtime: /usr/lib/jvm/jdk-11.0.12
I'm doing this for future me's bc after all the links in StackOverflow, the solution was to check mvn.cmd file on C:\Program Files\Maven\apache-maven-3.6.3\bin...
On line 52 it sets the JDK, but it didn't had the "/bin" where my OpenJDK 15 stored the java.exe
This fixed the issue on Windows 11 but it could serve as an idea for other OS. Hope that it helps!
I'm trying to set up Cordova. When I run cordova build android I receive the following error:
(node:6816) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Failed to run "javac -version", make sure that you have a JDK installed.
You can get it from: http://www.oracle.com/technetwork/java/javase/downloads.
Your JAVA_HOME is invalid: C:\Program Files\Java\jdk1.8.0_161;C:\Program Files\Java\jdk1.8.0_161\bin
However I can run javac -version just fine.
C:\>javac -version
javac 1.8.0_161
I've tried to set JAVA_HOME in various ways: pointing to the root; pointing to the bin folder; set it as a User variable and also a System one; add %JAVA_HOME%\bin to Path (both for User and System) and so on.
I've checked several articles about this issue, and they say that if I'm able to use javac -version then that's supposed to indicate that my environmental variables are set correctly. Even if that's the case, Cordova still doesn't seem to recognize it.
Update
Following Stephen C's instructions, I've reset my variables, yet my error still persists. As you can see in the image I can call javac just fine, and both JAVA_HOME and Path seem to be set in the right way. (Note that actually it is %JAVA_HOME%\bin and not C:\Program Files\Java\jdk1.8.0_161\bin in the Path.)
I think you are confusing JAVA_HOME, PATH and CLASSPATH
The JAVA_HOME variable should be set to the name of a single directory. Not multiple directories with separators. The JAVA_HOME directory is the top directory of your JDK or JRE installation. Not the "bin" directory.
The PATH and CLASSPATH variables consist of a list of paths. For PATH the paths are pathnames for directories. For CLASSPATH the paths are pathnames for directories or JAR / ZIP files (or a particular kind of wildcard).
The PATH is where the shell searches for commands if you use a command name that is a simple name; e.g. java or javac.
`
The CLASSPATH is one of the ways that you can tell Java tools to look cor compiled classes to load, compile against, etcetera.
Your error message says this:
Your JAVA_HOME is invalid:
C:\Program Files\Java\jdk1.8.0_161;C:\Program Files\Java\jdk1.8.0_161\bin
This is wrong for two reasons:
JAVA_HOME should not be a path
C:\Program Files\Java\jdk1.8.0_161\bin is not a Java home. The Java home is C:\Program Files\Java\jdk1.8.0_161 .... probably.
The other thing you may have gotten wrong is that changes to environment variables do not necessarily propagate. For example, if you start a shell and then change an environment variable via the Windows GUI, the change may not propagate to the shell. You may need to exit the shell and restart it to pick up the new value.
If you are unsure, you can run (for example) echo %PATH% to see the current value of PATH in the current shell or script.
UPDATE
According to http://cordova.apache.org/docs/en/7.x/guide/platforms/android/index.html, you need to:
install Android Studio
set the ANDROID_HOME environment variable to the location of your Android SDK installation.
It is also recommended that you add the Android SDK's tools, tools/bin, and platform-tools directories to your PATH.
Remove java.dll from C:\Windows\System32 (if any).
I'm not sure but It may work correctly.
I did have JDK installed, and also put $JDK_HOME/bin on my PATH. However, I still have problem to install Java EE. Could you guys give me some hints? Thanks.
dav#Bruno:~$ ls
[some stuff...]
33511405_3645.jpg glassfish stuff
bea hplip-3.11.12-plugin.run temp
bin hpscan001.png Templates
C03_08.txt java_ee_sdk-6u4-jdk7-linux.sh Tomcat
c4c jdk1.7.0_10 Ubuntu One
[some stuff2...]
dav#Bruno:~$ echo $PATH
/home/dav/jdk1.7.0_10/lib:/usr/share/java:/home/dav/jdk1.7.0_10:/home/dav/jdk1.7.0_10/bin:/home/dav/Fluent.Inc/bin:/home/dav/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/home/dav/jdk1.7.0_10/lib:/usr/share/java
dav#Bruno:~$ sudo sh java_ee_sdk-6u4-jdk7-linux.sh
Could not locate a suitable jar utility.
Please ensure that you have Java 6 or newer installed on your system
and accessible in your PATH or by setting JAVA_HOME
dav#Bruno:~$
I think the problem you're facing is that the PATH variable you're looking at is set for the user 'dav', but because you're sudoing the sh command, the PATH changes to that of root, which probably doesn't contain the JDK.
I think you should try explicitly setting the JAVA_HOME environment variable, try running:
sudo JAVA_HOME=/home/dav/jdk1.7.0_10 sh java_ee_sdk-6u4-jdk7-linux.sh
in case someone still gets frustrated over this:
("Could not locate a suitable jar utility.
Please ensure that you have Java 7 or newer installed on your system
and accessible in your PATH or by setting JAVA_HOME")
First of all make sure you are not using "sudo" to install java ee.
when you use sudo you use a different environment (root, with not necessarily the same
environment variables). in this case (ee installation) sudo is not required.
In other (which ever) cases when root access is required make sure the required user/system variables are set on system level, not (just) on user level.
to set variables at system level instead of user level define the variables in a system level script, i.e. /etc/profile or /etc/profile.d
otherwise, if you are not using SUDO trying to install jee, and still have this "JAVA_HOME not set"-problem, try this:
the cause seems to be the JAVA_HOME variable that can not be found by the install script.
therefore adjust ~/.bashrc to define JAVA_HOME.
JAVA_HOME of course has to point to your oracle java (se/jdk) installation. If you haven't installed it, that's the first thing to do. JAVA_HOME should point at the root directory of the installation (not to the bin directory in it), i.e.:
export JAVA_HOME=/usr/local/jdk1.7.1_02.
Next change path like so:
PATH=$JAVA_HOME:$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
keep the faith
don't let frustrations get the better of you (perhaps making you take it out on your colleagues or loved ones :o )
don't allow stress to build up too much. take a break in time to watch a funny video or
take a stroll to the coffee machine, or have a little chat with that cute person a couple of desks away from you.
You'll need to create an update alternative for the "jar" executable like:
sudo update-alternatives --install "/usr/bin/jar" "jar" "/usr/lib/jvm/jdk1.6.0/bin/jar" 1
Note: You may need to use appropriate path in your case.
I downloaded this Java JDK and installed it.
But when I go to the command prompt to check the version, it says it's not recognized.
Is anyone else experiencing this issue with the latest Java?
I might not have installed the right version. I need the java that works with grails
C:\>java
'java' is not recognized as an internal or external command,
operable program or batch file.
C:\>java -version
'java' is not recognized as an internal or external command,
operable program or batch file.
C:\>
when i do a search on my computer for java, it does not find anything
Windows 2k8 R2 server-
For both java [-option] or %JAVA_HOME% to work in the command line you need the following:
In Control Panel->System and Security->System->Advanced system setting->Advanced->Environment Variables->System Variables
Edit the Path variable and add a ";" after the last value and add the the path to the Java bin directory:
e.g.- C:\Progra~2\Java\jre6\bin\
Add the JAVA_HOME Variable with the value set to the path for the java executable:
e.g.- C:\Progra~2\Java\jre6\bin\java.exe
Press simultaneously the "windows" and "pause" buttons on your keyboard, this will bring up the System Preferences dialog.
In the Advanced tab, find Environment Variables.
Then, in the User (upper) section, create or update the following two variables :
JAVA_HOME = where you put your JDK, eg. C:/Java/SDK
PATH = %JAVA_HOME%/bin
Close the dialogs.
Then, in a new command-line console, try "javac -version" and see if it's detected.
It's important that you use a new console, because environment variables are read only when the console is launched.
Java is typically installed (on Windows) as C:\Program Files\Java\jdk<version>
That installation directory has a subdirectory bin which you need to append to your PATH environment variable via the control panel. Then, the commands like java, javac etc. will be available on the command line.
BTW, the same is true for Grails.
Is the -version flag not recognized, or is the "java" command not recognized? One way to test this is just to type 'java' by itself and run it and see what happens.
If the command is not recognized, make sure that the JDK's install path is in your windows PATH. If not, you won't be able to use any of the java executables from the command prompt. Here's another link that may help out.
You need to manually add the path to javac.exe and java.exe to your operating system path. The Java installation program doesn't do that for you.
You most likely don't have java.exe in your system's PATH variable.
For Linux:
check $PATH and $JAVA_HOME. You can configure it in /etc/environment
From console you can check it like:
$ echo $PATH
For Windows:
My Computer -> Properties -> Advanced -> Environment Variables
Check there PATH.
From console you can check it like:
echo %PATH%
You should have a Java icon in Windows Control Panel. Locate the Java tab and click the View button. That will show you the path to the Java executables.
Last but not least, make sure you have restarted the computer so changes in the PATH variable can take effect.
You installed the JDK. Isn't java.exe part of the JRE? Do you have that installed?
Maybe your system variables in the environment variables are not set properly. Follow the steps in the link below. Finally, make sure the path component in system variables has only one JDK path. Delete other JDK paths that you won't use.
https://docs.oracle.com/javase/tutorial/essential/environment/paths.html
You might have installed a previous or older version of Java so you can just uninstall it and directly download JDK from Java JDK
I was also facing the same issue but when I downloaded and installed the latest version the issue was resolved.
Also uninstall any other Java versions which may be present in the program files.
To get to know other versions which may be present in your computer use Windows File Explorer to go to:
Files > Windows C > Program Files > Java
All the JDK and JRE you have will be listed there. Uninstall any other Java versions other than what you installed. And then make sure you have set the path variable of the JDK.
For me, it was incorrect line in the PATH
(1) Check PATH: Type "Edit System Environment Variables" on the search -> System Properties -> Advance -> Environment Variables -> System variables -> Path
(2) On the list, mine was C:\Program Files (x86)\Common Files\Oracle\Java\javapath so I just add \ at the end (the exe files in the javapath folder)
OS: Windows 10 64 bit
IF you set the PATH and it's not showing up in cmd when you run %PATH%, try restarting your computer.