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Operating Systems Linux Fedora Fedora: Uninstall Java JDK 1.8 and install Oracle Java 1.7.15 Post 303009957 by Peasant on Friday 22nd of December 2017 11:59:23 PM
Old 12-23-2017
No need to uninstall anything.

Install the required oracle java using rpm.
Using alternatives command as superuser one can change the default java used.

Bare in mind, that perhaps some programs on the system rely on open java, so above change could affect those.

One could also download only required oracle java as compressed archive with all binaries and libraries required.
Create a user on the system which will utilize that java environment.
Unpack the archive under /opt/orajava (for instance)
As root, chown /opt/orajava to user created.
Setup required java options in user home directory profile file (JAVA_HOME etc.)
Configure kernel parameters for that user, depending on the application requirements/load (if applicable, defaults are often ok).

Above setup will have no effect on the system other then running new processes/code (load) under user created above and consuming disk space required.

Hope that helps
Regards
Peasant.
 

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java-functions(7)						RPM Java packaging						 java-functions(7)

NAME
java-functions - Functions library for Java applications. Written for the JPackage Project <http://www.jpackage.org/>: SYNOPSIS
set_jvm() Set the java virtual machine. Use a JAVA_HOME if defined, or try to find it from java command set_classpath() Set the classpath - this functions requires a valid JAVA_HOME, JAVACMD, and JAVA_LIBDIR. JARs could be specified as an argument, or via ADDITIONAL_JARS variable. set_javacmd() set the JAVACMD variable. Options should be passed via JAVACMD_OPTS variable. set_flags() set FLAGS variable. They could be specified as an argument, or via ADDITIONAL_FLAGS variable. set_options() set OPTIONS variable. They could be specified as an argument, or via ADDITIONAL_OPTIONS variable. run() run the application. It executed a following command. If VERBOSE is defined, then it prints the command to stdout. exec $JAVACMD $FLAGS -classpath $CLASSPATH $OPTIONS $MAIN_CLASS "$@" set_jvm_dirs() set JVM-related directories (JVM_LIBDIR, JAVA_VERSION, JAVAVER_LIBDIR and JAVAVER_JNIDIR variables). Requires a correct JAVA_LIBDIR, JAVA_HOME and JAVA_CMD. link_jar_repository() links a jar repository. Options could be found in build-jar-repository(1) find_jar() finds a specific extention (jar or directory). Requires a correct JAVA_LIBDIR, JAVAVER_LIBDIR and JVM_LIBDIR. Used by find-jar(1) com- mand. do_find_jar() core routine used by find_jar() check_java_env() checks java environment - the JAVA_HOME, JAVACMD, JAVA_LIBDIR, JNI_LIBDIR variables. DESCRIPTION
This is a library of generic shell functions which should be used on jpackage.org compatible distributions. FILES
/use/share/java-utils/java-functions shell script functions library for Java applications /etc/java/java.conf system-wide Java configuration file ~/.java/java.conf user's Java configuration SEE ALSO
Regular Manual Pages build-jar-repository(1) find-jar(1) java.conf(5) jpackage-utils(7) AUTHORS
Guillaume Rousse <guillomovitch@sourceforge.net> Ville Skytta <scop at jpackage.org> David Walluck <david@jpackage.org> Nicolas Mailhot <Nicolas.Mailhot at laPoste.net> REPORTING BUGS
Report bugs using JPackage Bugzilla (http://www.jpackage.org/bugzilla/) jpackage-utils 1.7.5 February 2009 java-functions(7)
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