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It ultimately resolves to the JRE version that has been selected as the default using the update-alternatives command. The jre entry in that directory is a symbolic link. I understand that "jre-1.7.0","jre-1.8.0" are different versions, but how about the difference between "jre" and "jre-1.7.0"? However, Java 7 is end-of-life, so Java 8 is advisable. It says that Tomcat 8.5.x requires Java 7 or later. The Apache Tomcat versions page lists the Java versions that are compatible for various Tomcat versions. # Systemd unit file for tomcatĭescription=Apache Tomcat Web Application ContainerĮnvironment=CATALINA_PID=/temp/tomcat.pidĮnvironment=CATALINA_HOME=Įnvironment=CATALINA_BASE=Įnvironment='CATALINA_OPTS=-Xms512M -Xmx1024M -server -XX:+UseParallelGC'Įnvironment='JAVA_OPTS=true =file:/dev/./urandom'ĮxecStart=/bin/startup.sh I am now trying to install Tomcat 8.5.55 in CentOS 7.I am asking this question because, when I create tomcat service file, there is a line which specifies the JAVA_HOME, and I couldn't figure out whether to give "jre" or "jre-1.7.0" or "jre-1.8.0" in this path. It is an open source implementation of JavaSE and this includes JDK.

It is only including JRE and does not include JDK, only installing the JRE part from the open JDK. It is only including JRE and does not include JDK jre-1.7.0-openjdk

The difference I found from jre-1.7.0 and jre-1.8.0 is that this jre is including "jjs" which is a javascript library which is depreciated now jre-1.7.0 It is only including JRE and does not include JDK

Is a sybolic link pointing to /etc/alternatives/jre My query what is the difference of these versions, and which should be specifed during installation of Tomcat8.5.55. Lrwxrwxrwx 1 root root 29 jre-openjdk -> /etc/alternatives/jre_openjdk Lrwxrwxrwx 1 root root 35 jre-1.8.0-openjdk -> /etc/alternatives/jre_1.8.0_openjdk Lrwxrwxrwx 1 root root 27 jre-1.8.0 -> /etc/alternatives/jre_1.8.0 Lrwxrwxrwx 1 root root 35 jre-1.7.0-openjdk -> /etc/alternatives/jre_1.7.0_openjdk Lrwxrwxrwx 1 root root 27 jre-1.7.0 -> /etc/alternatives/jre_1.7.0 Terminal Screenshot lrwxrwxrwx 1 root root 21 jre -> /etc/alternatives/jre After I installed JDK for Linux X64 (8u181-b13), the directory of /usr/lib/jvm included the following symbolic link of jre's.