Im trying to install Java in install but for some reason its not working.
I tried the same way as mentioned in this website-http://www.java.com/en/download/help/linux_install.xml#enable
I see Java installed in my desktop when I try this command,
premvidya#ubuntu:~/Desktop$ ls
jre1.6.0_31 jre-6u31-linux-i586(2).bin jre-6u31-linux-i586.bin
but when I try java - version, I get the following error,
premvidya#ubuntu:~/Desktop$ java -version
The program 'java' can be found in the following packages:
* gij-4.3
* java-gcj-compat-headless
* openjdk-6-jre-headless
* cacao
* gij-4.2
* jamvm
* kaffe
Try: sudo apt-get install
bash: java: command not found
Any help would be appreciated.
Why are you trying to manually install java? There is a repository for this, and it's all managed for you. Uninstall whatever you have put on your system manually and install it via command line.
apt-get cache search java
apt-get cache search jdk
or
start Ubuntu Software Center -> search for java.
Once installed via apt-get, the new java commands will be available immediately in your PATH, so long as you haven't removed anything...
#user1050619
Hi user1050619,
I have come across the solution which will work on any version of Ubuntu definitely keeping other java versions intact.
I have used standalone installation of Java.
For this, please download tar.gz version of Java from
Oracle website.
Suppose, your jdk installation tar file at location /home/don/
don#ubuntu ~ $ tar zxf jdk-7u45-linux-i586.tar.gz
don#ubuntu ~ $ sudo bash
[sudo] password for don:
ubuntu ~ # mv /home/don/jdk1.7.0_45/ /usr/lib/jvm/
ubuntu ~ # cd /usr/lib/jvm/
ubuntu jvm # update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_45/bin/java 3
ubuntu jvm # update-alternatives --config java
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib/jvm/java-7-openjdk-i386/jre/bin/java 1071 auto mode
1 /usr/lib/jvm/java-7-openjdk-i386/jre/bin/java 1071 manual mode
2 /usr/lib/jvm/jdk1.7.0_45/bin/java 3 manual mode
Press enter to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/lib/jvm/jdk1.7.0_45/bin/java to provide /usr/bin/java (java) in manual mode
ubuntu jvm # java -version
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) Server VM (build 24.45-b08, mixed mode)
and you are done here without any hassles.
Happy programming !!
it should be "apt-cache search java6" or just "apt-cache search java". It'll give you a list of all the package related to java. If you want to install sun's java then you download the java-**.bin file like you did and then run "sudo /bin/sh jre-6u31-linux-i586.bin" That'll run the installer from the sun java you downloaded and begin to install. Answer the question and install the package.
Related
I just installed Netbeans using the script on Oracle's website and I'm having some trouble getting it to work. After opening Netbeans I went to open up a simple .java file just to test it out and got this error:
"The JDK is missing and is required to run some Neatbeans modules. Please use the --jdkhome command line option to specify a JDK installation or see http://wiki.netbeans.org/FaqRunningOnJre for more information."
I have OpenJDK, and I'm not sure what's meant by using the --jdkhome command line option. I also visited the wiki and it's about doing a full installation of JDK, which I don't think I should need to do. Any help is appreciated.
I think it's better to use Oracle Java JDK rather than Open JDK if you want to use Netbeans for java development
You can use this link to set Oracle Java JDK in Linux Mint
So, it's better to follow theses instructions (JDK install) prior to Netbeans install and all things will go well.
Steps:
1-Remove OpenJDK installation
sudo apt-get update && apt-get remove openjdk*
2- Download Oracle JDK you want to install (for example JDK 8)
Download the *.tar.gz one.
example for current version: jdk-8u65-linux-x64.tar.gz
3- Extract the file and create a folder where to move it
tar -zxvf jdk-8u65-linux-x64.tar.gz
sudo mkdir -p /opt/java
sudo mv jdk1.8.0_65 /opt/java
4- Make JDK system default
sudo update-alternatives --install "/usr/bin/java" "java"
"/opt/java/jdk1.8.0_65/bin/java" 1
sudo update-alternatives --set java /opt/java/jdk1.8.0_65/bin/java
At this stage, you can start the installation of Netbeans IDE and it will automatically detect your Oracle JDK setting
I tested a short HelloWorld Java example, and I don't have any issue.
Here is the setting JDK view in Netbeans:
If you want to add the JAVA Home dir to your system
Proceed like this
You have to be in root mode and then edit this file: /etc/bash.bashrc
and add:
#JAVA HOME
JAVA_HOME=/opt/java/jdk1.8.0_65
export JAVA_HOME
PATH=$PATH:$JAVA_HOME/bin
export PATH
Reboot your Mint system
Now you'll have javac working in command line...
This is a newly installed centos 6.2 x86_64 I have downloaded java 8u5 rpm for linux to run a .jar file, but I am unable to. I have removed java through terminal through the command "rpm -e jar-1.8.0_05", and have attempted to reinstall it, though I still get the same error. I have also attempted to install java 7u60, but I still get the same error.
I am now on java 8u5, trying to find a fix for this.
Image:
http://i.stack.imgur.com/f0kzk.png
Try running
cd <path to jar file>
/user/java/jre1.8.0_05/bin/java -jar <jarname>
I have installed openproj_1.4-2.deb on my ubuntu. and I'm getting the following err while openinig the same.
Your Java vendor is "Oracle Corporation". To run OpenProj, you need the Sun Java implementation.
The auto-detected Java Runtime used is..
I have tried to fix by editing $HOME/.openproj/run.conf file by updating JAVA_EXE variable. But it is not working.
How can I run openproj on my Linux?
Please help, Thanks in advance.
(sorry for unable to create a new tag, openproj)
Open $HOME/.openproj/run.conf and Change
JAVA_OPTS="-Xms128m -Xmx768m"
To
JAVA_OPTS="-Djava.vendor=Sun -Xms128m -Xmx768m"
then run it, It will work fine.
I'm able to fix this by adding -Djava.vendor="Sun Microsystems Inc." for java command in run_openproj() of /usr/bin/openproj script.
here is the updated function after my change:
run_openproj() {
if [ "$LOG_LEVEL" ] && [ "x$LOG_LEVEL" = "xDEBUG" ]; then
"$JAVA_EXE" $JAVA_OPTS -Djava.vendor="Sun Microsystems Inc." -jar "$OPENPROJ_HOME/openproj.jar" $ARGS > "$LOG_FILE"
else
"$JAVA_EXE" $JAVA_OPTS -Djava.vendor="Sun Microsystems Inc." -jar "$OPENPROJ_HOME/openproj.jar" $ARGS > /dev/null 2>&1
fi
}
I solved it by installing IBM java version. Note the installation directory, by default it is: /opt/ibm/java-x86_64-80/.
Once IBM java is installed it should be configured to be used by OpenProj.
In order to do that run the following command (maybe the installation path should be updated, this is: /opt/ibm/java-x86_64-80/jre/bin/java):
sudo update-alternatives --install /usr/bin/java java /opt/ibm/java-x86_64-80/jre/bin/java 20000
Now check that the configuration has been saved properly, else set it manually with:
sudo update-alternatives --config java
Now check java version with:
java -version
You should get something similar to this:
java version "1.8.0_351"
Java(TM) SE Runtime Environment (build 8.0.7.20 - pxa6480sr7fp20-20221020_01(SR7 FP20))
IBM J9 VM (build 2.9, JRE 1.8.0 Linux amd64-64-Bit Compressed References 20220929_37824 (JIT enabled, AOT enabled)
OpenJ9 - 02180fe
OMR - 48fc32a
IBM - bf759bf)
JCL - 20220922_01 based on Oracle jdk8u351-b10
Now, OpenProj can be executed properly.
If it fails again you may delete the configuration file:
rm ~/.openproj/run.conf
I may have multiple questions here, but ultimately I'm trying to compile and run a Java program that references 3rd party JAR files (on Ubuntu Linux) so I thought it was appropriate to keep it to one question.
I'm trying to get Java JDK 7 properly installed and configured to run a simple program on Ubuntu Linux. I'd like to get instructions from an expert that can help me, at the very least, to run a simple Java program from the command line (perhaps a "Hello World" application?). I've only compiled and run Java programs on Windows in the past, so this is new to me. Last night, I read that you have to be careful of not installing the Open JDK, and to install the Oracle JDK. It appears that Ubuntu 11.10 installs Java Open JDK for you when the OS is installed, among others.
I'm running 32-bit Ubuntu, not 64-bit. So I downloaded this Linux JDK file:
jdk-7u4-linux-i586.tar.gz
I unpacked the tarball into /usr/java and then deleted the *.gz file to save disk space. Some tutorials say to install into /usr/java and some say to install into /usr/lib/jvm, so I just picked one and rolled with it. If you have a suggestion on the appropriate install directory, please let me know what you suggest.
I then checked what Java version was installed (below) with the "java -version" command. It did not find the Oracle JDK.
(1) Why didn't the command list the Oracle JDK package I just installed?
mac#UBUNTU:/usr/lib$ java -version
The program 'java' can be found in the following packages:
* gcj-4.4-jre-headless
* gcj-4.6-jre-headless
* openjdk-6-jre-headless
* gcj-4.5-jre-headless
* openjdk-7-jre-headless
Try: sudo apt-get install <selected package>
mac#UBUNTU:/usr/lib$
(2) Can you help me with the steps necessary to configure this Linux machine to compile a Java program (finish what I just started)?
(3) Can you help me with the steps to compile a *.java file to create the *.class file?
(4) Can you help me run the Java program--the one we just compiled?
(5) Suppose I want to include multiple *.jar files (3rd party assemblies) in my Java program. How does Java know on Linux where to find these files if they are not in the directory running the Java program referencing them? (I'm only familiar with a CLASSPATH in Windows)
Ubuntu is based on Debian and its apt-get utility. apt-get will list only known packages. The one you installed is just a folder lying on your system and apt-get does not even know about it.
It looks like java is not on your path. So either you create a symbolic link to the java binary in one of the folders of your path (type env to see what's in your path variable), or you add the JDK bin directory to your path (see command export). As a last resort, you can type the absolute path to the java binary, but that's just painful.
To compile, you simply use javac (Java compiler). For example javac Test.java. Make sure that javac is also on your path (or use the absolute path to the java compiler)
To run it, type java -cp . Test (don't forget to type the fully qualified name of your class if you put it inside a package, which is recommended)
When you compile or when you run, use the argument -cp followed by the list of jars you want to use (separated by a ':' on Linux and by a ';' on Windows). You may use wildcards in your classpath (like lib/*.jar) but you may also have to escape the wildcard to avoid shell expansion (like this lib/\*.jar).
I am installing java to my Linux machine. Downloading the jre and jdk and extracting them did not help only - I assume some environmental variables are also needed. What all path variables are needed to be set? With which values? Expecting the java installs itself to <installation-dir>?
Depending on your distribution it may be easiest to install from your package manager. On Ubuntu, for example, you can do:
sudo aptitude install open-jdk
Otherwise, usually the sun (oracle) version of java comes with a .bin file which you need to make executable and run as root in order to get java properly installed.
You shouldn't need to set any environment variables to get java to work, although some applications will require you to set JAVA_HOME, JDK_HOME and/or JRE_HOME to point to the java install's bin directory. You can see where your java install is by looking at where the symlink from
/etc/alternatives/java
points.
Most Linux systems use the Gnu Java implementation by default and don't change this if you install an additional JDK. Therefore you need to explicitly make your new Java installation the default Java to be used. You can do so by running sudo update-alternatives --config java.
If you prefer graphical configuration, you can install the "galternatives" package, which lets you configure all those application defaults in a nice little UI.
You just need to make /usr/bin/java point to the java executable in the directory where you had extracted the JRE/JDK.
If you extracted it to, say, /opt/jdk1.6.0_23/bin/java, then you need to create a link like this:
sudo ln -s /opt/jdk1.6.0_23/bin/java /usr/bin/java
Prior to this, you can choose to backup an old java installation by:
sudo mv /usr/bin/java /usr/bin/java_old
Here is how I installed JRE:
Install Sun Java Runtime.
Get the jdk for linux. Go to the root Directory. Use the following commands to install.
./configure
make
make install
PATH .= New Path where Java is installed.
To go to the root directory for UBUNTU use command "sudo". For FEDORA use "su".