Oct 19, 2016 · To setup environment variable just follow some steps from root user: # vi /etc/profile.d/java.sh Add the following lines to the java.sh file-

2) JAVA_HOME variable is short and concise instead of full path to JDK installation directory. 3) JAVA_HOME variable is platform independence i.e. if your startup script uses JAVA_HOME then it can run on Windows and UNIX without any modification, you just need to set JAVA_HOME on respective operating system.

Mar 8, 2012 · Once I've installed the openjdk version of the Java Development Kit on an Ubuntu machine, I use this procedure to create a JAVA_HOME environment variable that doesn't need to be changed after every version upgrade of the openjdk installation.

To access either the current value of a system wide variable or a user variable in Java, see below: String javaHome = System.getenv("JAVA_HOME"); For more information on environment variables see this wikipedia page. Also make sure the environment variable you are trying to read is properly set before invoking Java by doing a: echo %MYENVVAR%

Jul 28, 2024 · Add a user environment variable JAVA_TOOL_OPTIONS with value -Dfile.encoding="UTF-8". This ensures that Java (and tools such as Maven) will run with a Charset.defaultCharset() of UTF-8 (instead of the default Windows-1252).

Jan 23, 2017 · For obtaining only one System Variable use the following code: String sysEnvStr = System.getenv("JAVA_HOME"); If it returns null then make changes in your .bashrc file. Try exporting that particular variable.

Mar 18, 2019 · java -XshowSettings:properties -version This is helpful if you don't have a Java application already running, thus no pid to pass to one of the other commands. If you are seeking the properties of a JVM already running that has properties set via default or set explicitly by command, then use the pid for that JVM found via jps with the jcmd or ...

Aug 14, 2011 · Environment variables are accessible by any process and Java system properties are only accessible by the process they are added to. Also as Bohemian stated, env variables are set in the OS (however they 'can' be set through Java) and system properties are passed as command line options or set via setProperty().

Dec 17, 2009 · On Windows, OpenJDK's get_temp_directory() function makes a Win32 API call to GetTempPath(); this is how on Windows, Java reflects the value of the TMP environment variable. On Linux and Solaris, the same get_temp_directory() functions return a static value of /tmp/.

Nov 22, 2016 · Perhaps there is an effort to deprecate it in Java 8, but the shear number of tools that rely on JAVA_HOME will mandate a need to continue to define the variable for many years yet... – harschware Commented Jun 27, 2015 at 19:41