Question

I am new in ubuntu and have a problem. I can not start RubyMine 4:

kvet@Kvet-Notebook:~/RubyMine-4.0.3/bin$ java -version
java version "1.7.0_03"
OpenJDK Runtime Environment (IcedTea7 2.1.1pre) (7~u3-2.1.1~pre1-1ubuntu2)
OpenJDK 64-Bit Server VM (build 22.0-b10, mixed mode)
kvet@Kvet-Notebook:~/RubyMine-4.0.3/bin$ ./rubymine.sh
OpenJDK Runtime Environment (IcedTea7 2.1.1pre) (7~u3-2.1.1~pre1-1ubuntu2)
OpenJDK 64-Bit Server VM (build 22.0-b10, mixed mode)
OpenJDK 64-Bit Server VM (build 22.0-b10, mixed mode)
WARNING: You are launching the IDE using OpenJDK Java runtime.

         THIS IS STRICTLY UNSUPPORTED DUE TO KNOWN PERFORMANCE AND GRAPHICS PROBLEMS!

NOTE:    If you have both Oracle (Sun) JDK and OpenJDK installed
         please validate either RUBYMINE_JDK, JDK_HOME, or JAVA_HOME environment variable points to valid Oracle (Sun) JDK installation.
         See http://ow.ly/6TuKQ for more info on switching default JDK.

Press Enter to continue.

Error: Could not find or load main class com.intellij.idea.Main

I tried to install openjdk6 and has same error. I dont know what I must do.

Answer 1

I had this recently myself ([ERROR: cannot start RubyMine. No JDK found. JDK Version? + desktop link).

Answer: Install java and check your path:

Download oracle7 jdk at:
http://www.oracle.com/technetwork/java/javase/downloads/java-se-jdk-7-download-432154.html

Follow instructions at:
http://www.webupd8.org/2011/09/how-to-install-oracle-java-7-jdk-in.html e.g.

After downloading java (above): Extract the downloaded Oracle Java JDK archive into your home folder and rename the newly created folder to “java-7-oracle”.

sudo mv its_name java-7-oracle

Install it:

cd
sudo mkdir -p  /usr/lib/jvm/ #just in case
sudo mv java-7-oracle/ /usr/lib/jvm/
sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update
sudo apt-get install update-java
sudo update-java

Check it:

java -version
javac -version