How do I know if I have JDK installed?
You might have either JRE(Java Runtime Environment) which is required to run java applications on the computer or JDK as shown below. 1. Open command prompt and enter “java –version”. If installed version number is displayed.
How do I know where java is installed Linux?
Linux
- Check if JAVA_HOME is already set , Open Console. …
- Make sure you have installed Java already.
- Execute: vi ~/.bashrc OR vi ~/.bash_profile.
- add line : export JAVA_HOME=/usr/java/jre1.8.0_04.
- save the file.
- source ~/.bashrc OR source ~/.bash_profile.
- Execute : echo $JAVA_HOME.
- Output should print the path.
How do I know if Tomcat is installed on Linux?
Using the release notes
- Windows: type RELEASE-NOTES | find “Apache Tomcat Version” Output: Apache Tomcat Version 8.0.22.
- Linux: cat RELEASE-NOTES | grep “Apache Tomcat Version” Output: Apache Tomcat Version 8.0.22.
How do I know if I have JDK or OpenJDK?
You can write a simple bash script to check this out:
- Open any text editor (preferrably vim or emacs).
- create a file named script.sh (or any name with the . …
- paste the following code in it: #!/bin/bash if [[ $(java -version 2>&1) == *”OpenJDK”* ]]; then echo ok; else echo ‘not ok’; fi.
- save and exit the editor.
Where is OpenJDK installed on Linux?
Red Hat Enterprise Linux installs OpenJDK 1.6 into either /usr/lib/jvm/java-1.6. 0-openjdk-1.6.
How do I find where java is installed?
Open File Explorer (Win⊞ + R, type explorer, hit Enter), and browse for your Java installation folder. It will likely be installed in either Program FilesJava or Program Files (x86)Java on your OS drive. Once you find your Java folder, Open to it.
How do I know if JVM is running on Linux?
You can run the jps command (from the bin folder of JDK if it is not in your path) to find out what java processes (JVMs) are running on your machine. Depends on the JVM and native libs. You may see JVM threads show up with distinct PIDs in ps .
How do I start Tomcat in Linux?
How to Start and Stop Apache Tomcat from the Command Line (Linux)
- Start a Terminal window from the menu bar.
- Type in sudo service tomcat7 start and then hit Enter :
- You will receive the following message indicating the server is started:
How do I know if Apache is installed on Linux?
How to Check the Apache Version
- Open terminal application on your Linux, Windows/WSL or macOS desktop.
- Login to remote server using the ssh command.
- To see Apache version on a Debian/Ubuntu Linux, run: apache2 -v.
- For CentOS/RHEL/Fedora Linux server, type command: httpd -v.