How to give java path in ubuntu

I am facing problem setting up java path while installing mysql database in my ubuntu PC. The procedure shows the following and i hav no idea for setting the java path

Error: /usr/lib/jvm/java-1.7.0-openjdk-amd64/bin/java not found or not a valid JDK
Type the full pathname of a JDK installation (or Ctrl-C to quit), the path will be stored in /home/devkrishna/.sqldeveloper/4.1.0/product.conf
/usr/lib/jvm/java-1.8.0-openjdk-amd64
Error: Java home /usr/lib/jvm/java-1.8.0-openjdk-amd64/bin/java is not a JDK.
Running SQL Developer under a JRE is not supported.

If this Java VM is actually a full JDK installation, add
'SetSkipJ2SDKCheck true' to one of the following files.
Otherwise specify a different Java JDK location with a
SetJavaHome directive in one of the following files:
/home/devkrishna/.sqldeveloper/4.1.0/product.conf
/opt/sqldeveloper/sqldeveloper/bin/sqldeveloper.conf

• Open terminal (Ctrl+Alt+t)

• Type

  sudo gedit .bashrc 
  

• Enter password of ubuntu user
• Go to last line of the file

• Type below code in new line

  export JAVA_HOME=enter_java_path_here
  export PATH=$JAVA_HOME/bin:$PATH
  eg: export JAVA_HOME=/home/pranav/jdk1.8.0_131
      export PATH=$JAVA_HOME/bin:$PATH
  

• Save the file

• Type

  source ~/.bashrc
  

  in terminal

• Done