Question

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How do I change my default Java directory?

rated 0 times [ 1] [ 0] / answers: 1 / hits: 4698 / 1 Year ago, mon, march 6, 2023, 11:55:57

I am new to Ubuntu and am trying to set up Java to run and compile programs.
As I am very fresh, I am not sure how to tell which version I am using but file /sbin/init returns:

    ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=0x7aa29ded613e503fb09fb75d94026f3256f01e7a, stripped

The problem I have is when it comes to running the Java programs. Although the programs compile they don't seem to run. I used this guide:
http://www.wikihow.com/Install-Oracle-Java-on-Ubuntu-Linux

And everything seems fine until I go to run the program I get this error message:

    bash: /usr/bin/java: No such file or directory

Java is supposed to be run from /usr/local/java and the /etc/profile has:

    JAVA_HOME=/usr/local/java/jdk1.7.0_45

    PATH=$PATH:$HOME/bin:$JAVA_HOME/bin

    JRE_HOME=/usr/local/java/jre1.7.0_45

    PATH=$PATH:$HOME/bin:$JRE_HOME/bin

    export JAVA_HOME

    export JRE_HOME

    export PATH

I'm sure I'm missing something really simple. Thanks in advance.

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hamostic

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2 Years ago

answered 1 Year ago oreera · Accepted Answer

After recently installing Oracle Java following the same instructions, I ran into a similar error. The link to the java executable appears to be missing in your /usr/bin.
To resolve this, I would manually create the link:

$ sudo ln -s /etc/alternatives/java /usr/bin/java

You may have to change /etc/alternatives/java to point to the correct location, but this is the default based on the instructions you followed.