LinkageError occurred while loading main class Area_Triangle_Determinants

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Dear fedora users,

I want to generate randomly generated triangles from points as in 

https://www.sanfoundry.com/java-program-compute-area-triangle-using-determinants/

The java program compiles fine but executing it returns an error. I do not understand the error.  

[olivares@fedora mptmp]$ uname -a
Linux fedora 6.4.15-200.fc38.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Sep  7 00:25:01 UTC 2023 x86_64 GNU/Linux
[olivares@fedora mptmp]$ javac Area_Triangle_Determinants.java 
[olivares@fedora mptmp]$ java Area_Triangle_Determinants 
Error: LinkageError occurred while loading main class Area_Triangle_Determinants
	java.lang.UnsupportedClassVersionError: Area_Triangle_Determinants has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0
[olivares@fedora mptmp]$

I had another program called Ulam (3n+1) conjecture, Or Collatz Conjecture and it also fails to run.  

[olivares@fedora mptmp]$ javac Ulam.java 
[olivares@fedora mptmp]$ java Ulam 
Error: LinkageError occurred while loading main class Ulam
	java.lang.UnsupportedClassVersionError: Ulam has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0
[olivares@fedora mptmp]$ 


I have not been able to run theses programs using openjdk ... 

[olivares@fedora mptmp]$ sudo dnf search openjdk
Last metadata expiration check: 1:48:18 ago on Fri 22 Sep 2023 12:55:05 PM CDT.
======================= Name & Summary Matched: openjdk ========================
java-1.8.0-openjdk.x86_64 : OpenJDK 8 Runtime Environment
java-1.8.0-openjdk-demo.x86_64 : OpenJDK 8 Demos
java-1.8.0-openjdk-demo-fastdebug.x86_64 : OpenJDK 8 Demos optimised with full
                                         : debugging on
java-1.8.0-openjdk-demo-slowdebug.x86_64 : OpenJDK 8 Demos unoptimised with full
                                         : debugging on
java-1.8.0-openjdk-devel.x86_64 : OpenJDK 8 Development Environment
java-1.8.0-openjdk-devel-fastdebug.x86_64 : OpenJDK 8 Development Environment
                                          : optimised with full debugging on
java-1.8.0-openjdk-devel-slowdebug.x86_64 : OpenJDK 8 Development Environment
                                          : unoptimised with full debugging on
java-1.8.0-openjdk-fastdebug.x86_64 : OpenJDK 8 Runtime Environment optimised
                                    : with full debugging on
java-1.8.0-openjdk-headless.x86_64 : OpenJDK 8 Headless Runtime Environment
java-1.8.0-openjdk-headless-fastdebug.x86_64 : OpenJDK 8 Runtime Environment
                                             : optimised with full debugging on
java-1.8.0-openjdk-headless-slowdebug.x86_64 : OpenJDK 8 Runtime Environment
     ...: unoptimised with full debugging on
java-1.8.0-openjdk-javadoc.noarch : OpenJDK 8 API documentation
java-1.8.0-openjdk-javadoc-zip.noarch : OpenJDK 8 API documentation compressed
                                      : in a single archive
java-1.8.0-openjdk-openjfx.x86_64 : OpenJDK x OpenJFX connector. This package
     ...: adds symliks finishing Java FX integration to java-1.8.0-openjdk
java-1.8.0-openjdk-openjfx-devel.x86_64 : OpenJDK x OpenJFX connector for FX
     ...: developers. This package adds symliks finishing Java FX integration to
     ...: java-1.8.0-openjdk-devel
java-1.8.0-openjdk-openjfx-devel-fastdebug.x86_64 : OpenJDK x OpenJFX connector
     ...: for FX developers for packages with debugging on and optimisation.
     ...: This package adds symliks finishing Java FX integration to
     ...: java-1.8.0-openjdk-devel-slowdebug
java-1.8.0-openjdk-openjfx-devel-slowdebug.x86_64 : OpenJDK x OpenJFX connector
     ...: for FX developers for packages with debugging on and no optimisation.
     ...: This package adds symliks finishing Java FX integration to
     ...: java-1.8.0-openjdk-devel-slowdebug
java-1.8.0-openjdk-openjfx-fastdebug.x86_64 : OpenJDK x OpenJFX connector for
     ...: packages with debugging on and optimisation. his package adds symliks
     ...: finishing Java FX integration to java-1.8.0-openjdk-fastdebug
java-1.8.0-openjdk-openjfx-slowdebug.x86_64 : OpenJDK x OpenJFX connector for
     ...: packages with debugging on and no optimisation. his package adds
     ...: symliks finishing Java FX integration to java-1.8.0-openjdk-slowdebug
java-1.8.0-openjdk-portable.x86_64 : OpenJDK 8 Runtime Environment portable
                                   : edition
java-1.8.0-openjdk-portable-devel.x86_64 : OpenJDK 8 Development Environment
                                         : portable edition
java-1.8.0-openjdk-portable-devel-fastdebug.x86_64 : OpenJDK 8 Development
     ...: Environment portable edition optimised with full debugging on
java-1.8.0-openjdk-portable-devel-slowdebug.x86_64 : OpenJDK 8 Development
     ...: Environment portable edition unoptimised with full debugging on
java-1.8.0-openjdk-portable-fastdebug.x86_64 : OpenJDK 8 Runtime Environment
     ...: portable edition optimised with full debugging on
java-1.8.0-openjdk-portable-slowdebug.x86_64 : OpenJDK 8 Runtime Environment
     ...: portable edition unoptimised with full debugging on
java-1.8.0-openjdk-portable-sources.x86_64 : OpenJDK 8 full patched sources of
                                           : portable JDK
java-1.8.0-openjdk-slowdebug.x86_64 : OpenJDK 8 Runtime Environment unoptimised
                                    : with full debugging on
java-1.8.0-openjdk-src.x86_64 : OpenJDK 8 Source Bundle
java-1.8.0-openjdk-src-fastdebug.x86_64 : OpenJDK 8 Source Bundle for packages
                                        : with debugging on and optimisation
java-1.8.0-openjdk-src-slowdebug.x86_64 : OpenJDK 8 Source Bundle for packages
                                        : with debugging on and no optimisation
java-11-openjdk.x86_64 : OpenJDK 11 Runtime Environment
java-11-openjdk-demo.x86_64 : OpenJDK 11 Demos
java-11-openjdk-demo-fastdebug.x86_64 : OpenJDK 11 Demos optimised with full
                                      : debugging on
java-11-openjdk-demo-slowdebug.x86_64 : OpenJDK 11 Demos unoptimised with full
                                      : debugging on
java-11-openjdk-devel.x86_64 : OpenJDK 11 Development Environment
java-11-openjdk-devel-fastdebug.x86_64 : OpenJDK 11 Development Environment
                                       : optimised with full debugging on
java-11-openjdk-devel-slowdebug.x86_64 : OpenJDK 11 Development Environment
                                       : unoptimised with full debugging on
java-11-openjdk-fastdebug.x86_64 : OpenJDK 11 Runtime Environment optimised with
                                 : full debugging on
java-11-openjdk-headless.x86_64 : OpenJDK 11 Headless Runtime Environment
java-11-openjdk-headless-fastdebug.x86_64 : OpenJDK 11 Runtime Environment
                                          : optimised with full debugging on
java-11-openjdk-headless-slowdebug.x86_64 : OpenJDK 11 Runtime Environment
                                          : unoptimised with full debugging on
java-11-openjdk-javadoc.x86_64 : OpenJDK 11 API documentation
java-11-openjdk-javadoc-zip.x86_64 : OpenJDK 11 API documentation compressed in
                                   : a single archive
java-11-openjdk-jmods.x86_64 : JMods for OpenJDK 11
java-11-openjdk-jmods-fastdebug.x86_64 : JMods for OpenJDK 11 optimised with
                                       : full debugging on
java-11-openjdk-jmods-slowdebug.x86_64 : JMods for OpenJDK 11 unoptimised with
                                       : full debugging on
java-11-openjdk-portable.x86_64 : OpenJDK 11 Runtime Environment portable
                                : edition
java-11-openjdk-portable-devel.x86_64 : OpenJDK 11 Development Environment
                                      : portable edition
java-11-openjdk-portable-devel-fastdebug.x86_64 : OpenJDK 11 Runtime and
     ...: Development Environment portable edition optimised with full debugging
     ...: on
java-11-openjdk-portable-devel-slowdebug.x86_64 : OpenJDK 11 Runtime and
     ...: Development Environment portable edition unoptimised with full
     ...: debugging on
java-11-openjdk-portable-fastdebug.x86_64 : OpenJDK 11 Runtime Environment
     ...: portable edition optimised with full debugging on
java-11-openjdk-portable-slowdebug.x86_64 : OpenJDK 11 Runtime Environment
     ...: portable edition unoptimised with full debugging on
java-11-openjdk-portable-sources.x86_64 : OpenJDK 11 full patched sources of
                                        : portable JDK
java-11-openjdk-portable-static-libs.x86_64 : OpenJDK 11 libraries for static
                                            : linking - portable edition.
java-11-openjdk-portable-static-libs-fastdebug.x86_64 : OpenJDK 11 libraries for
     ...: static linking - portable edition optimised with full debugging on
java-11-openjdk-portable-static-libs-slowdebug.x86_64 : OpenJDK 11 libraries for
     ...: static linking - portable edition unoptimised with full debugging on
java-11-openjdk-slowdebug.x86_64 : OpenJDK 11 Runtime Environment unoptimised
                                 : with full debugging on
java-11-openjdk-src.x86_64 : OpenJDK 11 Source Bundle
java-11-openjdk-src-fastdebug.x86_64 : OpenJDK 11 Source Bundle for packages
                                     : with debugging on and optimisation
java-11-openjdk-src-slowdebug.x86_64 : OpenJDK 11 Source Bundle for packages
                                     : with debugging on and no optimisation
java-11-openjdk-static-libs.x86_64 : OpenJDK 11 libraries for static linking
java-11-openjdk-static-libs-fastdebug.x86_64 : OpenJDK 11 libraries for static
     ...: linking optimised with full debugging on
java-11-openjdk-static-libs-slowdebug.x86_64 : OpenJDK 11 libraries for static
     ...: linking unoptimised with full debugging on
java-17-openjdk.x86_64 : OpenJDK 17 Runtime Environment
java-17-openjdk-demo.x86_64 : OpenJDK 17 Demos
java-17-openjdk-demo-fastdebug.x86_64 : OpenJDK 17 Demos optimised with full
                                      : debugging on
java-17-openjdk-demo-slowdebug.x86_64 : OpenJDK 17 Demos unoptimised with full
                                      : debugging on
java-17-openjdk-devel.x86_64 : OpenJDK 17 Development Environment
java-17-openjdk-devel-fastdebug.x86_64 : OpenJDK 17 Development Environment
                                       : optimised with full debugging on
java-17-openjdk-devel-slowdebug.x86_64 : OpenJDK 17 Development Environment
                                       : unoptimised with full debugging on
java-17-openjdk-fastdebug.x86_64 : OpenJDK 17 Runtime Environment optimised with
                                 : full debugging on
java-17-openjdk-headless.x86_64 : OpenJDK 17 Headless Runtime Environment
java-17-openjdk-headless-fastdebug.x86_64 : OpenJDK 17 Runtime Environment
                                          : optimised with full debugging on
java-17-openjdk-headless-slowdebug.x86_64 : OpenJDK 17 Runtime Environment
                                          : unoptimised with full debugging on
java-17-openjdk-javadoc.x86_64 : OpenJDK 17 API documentation
java-17-openjdk-javadoc-zip.x86_64 : OpenJDK 17 API documentation compressed in
                                   : a single archive
java-17-openjdk-jmods.x86_64 : JMods for OpenJDK 17
java-17-openjdk-jmods-fastdebug.x86_64 : JMods for OpenJDK 17 optimised with
                                       : full debugging on
java-17-openjdk-jmods-slowdebug.x86_64 : JMods for OpenJDK 17 unoptimised with
                                       : full debugging on
java-17-openjdk-portable.x86_64 : OpenJDK 17 Runtime Environment portable
                                : edition
java-17-openjdk-portable-devel.x86_64 : OpenJDK 17 Development Environment
                                      : portable edition
java-17-openjdk-portable-devel-fastdebug.x86_64 : OpenJDK 17 Runtime and
     ...: Development Environment portable edition optimised with full debugging
     ...: on
java-17-openjdk-portable-devel-slowdebug.x86_64 : OpenJDK 17 Runtime and
     ...: Development Environment portable edition unoptimised with full
     ...: debugging on
java-17-openjdk-portable-fastdebug.x86_64 : OpenJDK 17 Runtime Environment
     ...: portable edition optimised with full debugging on
java-17-openjdk-portable-slowdebug.x86_64 : OpenJDK 17 Runtime Environment
     ...: portable edition unoptimised with full debugging on
java-17-openjdk-portable-sources.x86_64 : OpenJDK 17 full patched sources of
                                        : portable JDK
java-17-openjdk-portable-static-libs.x86_64 : OpenJDK 17 libraries for static
                                            : linking - portable edition.
java-17-openjdk-portable-static-libs-fastdebug.x86_64 : OpenJDK 17 libraries for
     ...: static linking - portable edition optimised with full debugging on
java-17-openjdk-portable-static-libs-slowdebug.x86_64 : OpenJDK 17 libraries for
     ...: static linking - portable edition unoptimised with full debugging on
java-17-openjdk-slowdebug.x86_64 : OpenJDK 17 Runtime Environment unoptimised
                                 : with full debugging on
java-17-openjdk-src.x86_64 : OpenJDK 17 Source Bundle
java-17-openjdk-src-fastdebug.x86_64 : OpenJDK 17 Source Bundle for packages
                                     : with debugging on and optimisation
java-17-openjdk-src-slowdebug.x86_64 : OpenJDK 17 Source Bundle for packages
                                     : with debugging on and no optimisation
java-17-openjdk-static-libs.x86_64 : OpenJDK 17 libraries for static linking
java-17-openjdk-static-libs-fastdebug.x86_64 : OpenJDK 17 libraries for static
     ...: linking optimised with full debugging on
java-17-openjdk-static-libs-slowdebug.x86_64 : OpenJDK 17 libraries for static
     ...: linking unoptimised with full debugging on
java-latest-openjdk.x86_64 : OpenJDK 21 Runtime Environment
java-latest-openjdk-demo.x86_64 : OpenJDK 21 Demos
java-latest-openjdk-demo-fastdebug.x86_64 : OpenJDK 21 Demos optimised with full
                                          : debugging on
java-latest-openjdk-demo-slowdebug.x86_64 : OpenJDK 21 Demos unoptimised with
                                          : full debugging on
java-latest-openjdk-devel.x86_64 : OpenJDK 21 Development Environment
java-latest-openjdk-devel-fastdebug.x86_64 : OpenJDK 21 Development Environment
                                           : optimised with full debugging on
java-latest-openjdk-devel-slowdebug.x86_64 : OpenJDK 21 Development Environment
                                           : unoptimised with full debugging on
java-latest-openjdk-fastdebug.x86_64 : OpenJDK 21 Runtime Environment optimised
                                     : with full debugging on
java-latest-openjdk-headless.x86_64 : OpenJDK 21 Headless Runtime Environment
java-latest-openjdk-headless-fastdebug.x86_64 : OpenJDK 21 Runtime Environment
                                              : optimised with full debugging on
java-latest-openjdk-headless-slowdebug.x86_64 : OpenJDK 21 Runtime Environment
     ...: unoptimised with full debugging on
java-latest-openjdk-javadoc.x86_64 : OpenJDK 21 API documentation
java-latest-openjdk-javadoc-zip.x86_64 : OpenJDK 21 API documentation compressed
                                       : in a single archive
java-latest-openjdk-jmods.x86_64 : JMods for OpenJDK 21
java-latest-openjdk-jmods-fastdebug.x86_64 : JMods for OpenJDK 21 optimised with
                                           : full debugging on
java-latest-openjdk-jmods-slowdebug.x86_64 : JMods for OpenJDK 21 unoptimised
                                           : with full debugging on
java-latest-openjdk-portable.x86_64 : OpenJDK 21 Runtime Environment portable
                                    : edition
java-latest-openjdk-portable-devel.x86_64 : OpenJDK 21 Development Environment
                                          : portable edition
java-latest-openjdk-portable-devel-fastdebug.x86_64 : OpenJDK 21 Runtime and
     ...: Development Environment portable edition optimised with full debugging
     ...: on
java-latest-openjdk-portable-devel-slowdebug.x86_64 : OpenJDK 21 Runtime and
     ...: Development Environment portable edition unoptimised with full
     ...: debugging on
java-latest-openjdk-portable-fastdebug.x86_64 : OpenJDK 21 Runtime Environment
     ...: portable edition optimised with full debugging on
java-latest-openjdk-portable-slowdebug.x86_64 : OpenJDK 21 Runtime Environment
     ...: portable edition unoptimised with full debugging on
java-latest-openjdk-portable-sources.x86_64 : OpenJDK 21 full patched sources of
                                            : portable JDK
java-latest-openjdk-portable-static-libs.x86_64 : OpenJDK 21 libraries for
     ...: static linking - portable edition.
java-latest-openjdk-portable-static-libs-fastdebug.x86_64 : OpenJDK 21 libraries
     ...: for static linking - portable edition optimised with full debugging on
java-latest-openjdk-portable-static-libs-slowdebug.x86_64 : OpenJDK 21 libraries
     ...: for static linking - portable edition unoptimised with full debugging
     ...: on
java-latest-openjdk-slowdebug.x86_64 : OpenJDK 21 Runtime Environment
                                     : unoptimised with full debugging on
java-latest-openjdk-src.x86_64 : OpenJDK 21 Source Bundle
java-latest-openjdk-src-fastdebug.x86_64 : OpenJDK 21 Source Bundle for packages
                                         : with debugging on and optimisation
java-latest-openjdk-src-slowdebug.x86_64 : OpenJDK 21 Source Bundle for packages
                                         : with debugging on and no optimisation
java-latest-openjdk-static-libs.x86_64 : OpenJDK 21 libraries for static linking
java-latest-openjdk-static-libs-fastdebug.x86_64 : OpenJDK 21 libraries for
     ...: static linking optimised with full debugging on
java-latest-openjdk-static-libs-slowdebug.x86_64 : OpenJDK 21 libraries for
     ...: static linking unoptimised with full debugging on
javapackages-bootstrap-openjdk8.noarch : OpenJDK 8 toolchain for Java Packages
                                       : Bootstrap
maven-local-openjdk11.noarch : OpenJDK 11 toolchain for XMvn
maven-local-openjdk17.noarch : OpenJDK 17 toolchain for XMvn
maven-local-openjdk8.noarch : OpenJDK 8 toolchain for XMvn
maven-openjdk11.noarch : OpenJDK 11 binding for Maven
maven-openjdk17.noarch : OpenJDK 17 binding for Maven
maven-openjdk8.noarch : OpenJDK 8 binding for Maven
openjdk-asmtools7-javadoc.noarch : Javadoc for openjdk-asmtools7
prometheus-jmx-exporter-openjdk11.noarch : OpenJDK 11 binding for
                                         : prometheus-jmx-exporter
prometheus-jmx-exporter-openjdk17.noarch : OpenJDK 17 binding for
                                         : prometheus-jmx-exporter
prometheus-jmx-exporter-openjdk8.noarch : OpenJDK 1.8.0 binding for
                                        : prometheus-jmx-exporter
============================ Name Matched: openjdk =============================
openjdk-asmtools.noarch : Set of tools used to assemble / disassemble proper and
                        : improper Java .class files
openjdk-asmtools7.noarch : Set of tools used to assemble / disassemble proper
     ...: and improper Java .class files for JDK version 11 and lesser
[olivares@fedora mptmp]$ 

any suggestions as to why it does not run?  Do I need to use oracle's java?  does openjdk no longer work.
Thank you in advance.

Best Regards,


Antonio 


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