Question: what is the difference between java_home and jre_home?
Answer: The JRE_HOME variable is used to specify location of a JRE. The JAVA_HOME variable is used to specify location of a JDK. Using JAVA_HOME provides access to certain additional startup options that are not allowed when JRE_HOME is used. If both JRE_HOME and JAVA_HOME are specified, JRE_HOME is used.