LinkageError occurred while loading main class Area_Triangle_Determinants

[olivares33561]

Dear fedora users,

I want to generate randomly generated triangles from points as in 

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

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 


Sent from ProtonMail, encrypted email based in Switzerland.

Sent with Proton Mail secure email.

[Samuel Sieb]

On 9/22/23 12:45, olivares33561 via users wrote:
>  Dear fedora users,
>  
>  I want to generate randomly generated triangles from points as in
>  
>  https://www.sanfoundry.com/java-program-compute-area-triangle-using-deter...
>  
>  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 
Looks like the compiler you're running is newer than the runtime you're 
using.
What do "javac --version" and "java --version" show?
What does "rpm -qa | grep openjdk" show?

[olivares33561]

>  > [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
>  
>  
>  Looks like the compiler you're running is newer than the runtime you're
>  using.
>  What do "javac --version" and "java --version" show?
>  What does "rpm -qa | grep openjdk" show?
>  _______________________________________________ 
[olivares@fedora mptmp]$ javac --version
javac 21
[olivares@fedora mptmp]$ java --version
openjdk 17.0.8 2023-07-18
OpenJDK Runtime Environment (Red_Hat-17.0.8.0.7-1.fc38) (build 17.0.8+7)
OpenJDK 64-Bit Server VM (Red_Hat-17.0.8.0.7-1.fc38) (build 17.0.8+7, mixed mode,
sharing)
[olivares@fedora mptmp]$ rpm -qa | grep openjdk
java-17-openjdk-headless-17.0.8.0.7-1.fc38.x86_64
java-latest-openjdk-headless-21.0.0.0.35-1.rolling.fc38.x86_64
java-latest-openjdk-21.0.0.0.35-1.rolling.fc38.x86_64
java-latest-openjdk-devel-21.0.0.0.35-1.rolling.fc38.x86_64
[olivares@fedora mptmp]$ 

Best Regards,


Antonio

[Samuel Sieb]

On 9/26/23 06:03, olivares33561 via users wrote:
> >> [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
> >
> >
> > Looks like the compiler you're running is newer than the runtime you're
> > using.
> > What do "javac --version" and "java --version" show?
> > What does "rpm -qa | grep openjdk" show?
> > _______________________________________________
>  
>  [olivares@fedora mptmp]$ javac --version
>  javac 21
>  [olivares@fedora mptmp]$ java --version
>  openjdk 17.0.8 2023-07-18
>  OpenJDK Runtime Environment (Red_Hat-17.0.8.0.7-1.fc38) (build 17.0.8+7)
>  OpenJDK 64-Bit Server VM (Red_Hat-17.0.8.0.7-1.fc38) (build 17.0.8+7, mixed mode,
> sharing) 
So there's the problem.  You're compiling with 21, but running it with 
17.  You could try adding "--release 17" to the javac command when you 
compile or switch the default java to 21 using the alternatives command. 
  Or directly specify the 17 compiler when you compile.

[olivares33561]

Sent from ProtonMail, encrypted email based in Switzerland.

Sent with Proton Mail secure email.

------- Original Message -------
On Tuesday, September 26th, 2023 at 12:03 PM, Samuel Sieb <samuel(a)sieb.net&gt; wrote:


>  On 9/26/23 06:03, olivares33561 via users wrote:
>  
>  > > > [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
>  > > 
>  > > Looks like the compiler you're running is newer than the runtime
> you're
>  > > using.
>  > > What do "javac --version" and "java --version" show?
>  > > What does "rpm -qa | grep openjdk" show?
>  > > _______________________________________________
>  > 
>  > [olivares@fedora mptmp]$ javac --version
>  > javac 21
>  > [olivares@fedora mptmp]$ java --version
>  > openjdk 17.0.8 2023-07-18
>  > OpenJDK Runtime Environment (Red_Hat-17.0.8.0.7-1.fc38) (build 17.0.8+7)
>  > OpenJDK 64-Bit Server VM (Red_Hat-17.0.8.0.7-1.fc38) (build 17.0.8+7, mixed mode,
> sharing)
>  
>  
>  So there's the problem. You're compiling with 21, but running it with
>  17. You could try adding "--release 17" to the javac command when you
>  compile or switch the default java to 21 using the alternatives command.
>  Or directly specify the 17 compiler when you compile.
>  _______________________________________________ 
Dear Sir,

Thank you for your help.

[olivares@fedora mptmp]$ rpm -qa | grep openjdk
java-17-openjdk-headless-17.0.8.0.7-1.fc38.x86_64
java-latest-openjdk-headless-21.0.0.0.35-1.rolling.fc38.x86_64
java-latest-openjdk-21.0.0.0.35-1.rolling.fc38.x86_64
java-latest-openjdk-devel-21.0.0.0.35-1.rolling.fc38.x86_64
[olivares@fedora mptmp]$ javac Ulam.java --release 17
[olivares@fedora mptmp]$ java Ulam 
Enter any Number
23
Given Number is : 23
You are begining with number 23

70	35	106	53	160	80	40	20	10	5	
16	8	4	2	1	

Ulam count is 15
[olivares@fedora mptmp]$

Is there a better way to avoid doing this, ie removing java 17 and forcing 21 ?  or vice
versa to avoid this.  I had not encountered this before in previous versions of Fedora it
just worked!  Now I have to specify.  What would be the best thing to do? and make it work
correctly.


Best Regards,



Antonio

[Samuel Sieb]

On 9/26/23 10:21, olivares33561 via users wrote:
>  Is there a better way to avoid doing this, ie removing java 17 and
> forcing 21 ?  or vice versa to avoid this.  I had not encountered this before in previous
> versions of Fedora it just worked!  Now I have to specify.  What would be the best thing
> to do? and make it work correctly. 
You could try removing 17 if nothing else depends on it.
You could remove the rolling 21 release devel and install the 17 devel. 
You could switch the default java to 21/rolling using the alternatives 
command.

[olivares33561]

Sent from ProtonMail, encrypted email based in Switzerland.

Sent with Proton Mail secure email.

------- Original Message -------
On Tuesday, September 26th, 2023 at 12:44 PM, Samuel Sieb <samuel(a)sieb.net&gt; wrote:


>  On 9/26/23 10:21, olivares33561 via users wrote:
>  
>  > Is there a better way to avoid doing this, ie removing java 17 and forcing 21 ? or
> vice versa to avoid this. I had not encountered this before in previous versions of Fedora
> it just worked! Now I have to specify. What would be the best thing to do? and make it
> work correctly.
>  
>  
>  You could try removing 17 if nothing else depends on it.
>  You could remove the rolling 21 release devel and install the 17 devel.
>  You could switch the default java to 21/rolling using the alternatives
>  command.
>  _______________________________________________ 
Interesting problem I have: 

[olivares@fedora mptmp]$  sudo dnf remove java-17-openjdk-headless
Dependencies resolved.
================================================================================
 Package                      Arch   Version                     Repo      Size
================================================================================
Removing:
 java-17-openjdk-headless     x86_64 1:17.0.8.0.7-1.fc38         @updates 205 M
Removing dependent packages:
 libreoffice-calc             x86_64 1:7.5.6.2-1.fc38            @updates  26 M
 libreoffice-emailmerge       x86_64 1:7.5.6.2-1.fc38            @updates  25 k
 libreoffice-graphicfilter    x86_64 1:7.5.6.2-1.fc38            @updates 1.0 M
 libreoffice-impress          x86_64 1:7.5.6.2-1.fc38            @updates 1.7 M
 libreoffice-writer           x86_64 1:7.5.6.2-1.fc38            @updates  12 M
 unoconv                      noarch 0.9.0-11.fc38               @fedora  250 k
Removing unused dependencies:
 Box2D                        x86_64 2.4.1-9.fc38                @fedora  243 k
 autocorr-en                  noarch 1:7.5.6.2-1.fc38            @updates 286 k
 clucene-contribs-lib         x86_64 2.3.3.4-45.20130812.e8e3d20git.fc38
                                                                 @fedora  386 k
 clucene-core                 x86_64 2.3.3.4-45.20130812.e8e3d20git.fc38
                                                                 @fedora  2.0 M
 google-carlito-fonts         noarch 1.103-0.21.20130920.fc38    @fedora  2.6 M
 google-crosextra-caladea-fonts
                              noarch 1:1.002-0.15.20130214.fc38  @fedora  251 k
 hyphen-en                    noarch 2.8.8-19.fc38               @fedora  104 k
 libabw                       x86_64 0.1.3-12.fc38               @fedora  271 k
 libcdr                       x86_64 0.1.7-12.fc38               @fedora  845 k
 libcmis                      x86_64 0.5.2-20.fc38               @fedora  1.1 M
 libe-book                    x86_64 0.1.3-30.fc38               @fedora  482 k
 libeot                       x86_64 0.01-28.fc38                @fedora   77 k
 libepubgen                   x86_64 0.1.1-15.fc38               @fedora  386 k
 libetonyek                   x86_64 0.1.10-9.fc38               @fedora  2.5 M
 libexttextcat                x86_64 3.4.6-6.fc38                @fedora  458 k
 libfreehand                  x86_64 0.1.2-20.fc38               @fedora  441 k
 liblangtag                   x86_64 0.6.4-3.fc38                @fedora  223 k
 liblangtag-data              noarch 0.6.4-3.fc38                @fedora  2.1 M
 libmspub                     x86_64 0.1.4-27.fc38               @fedora  408 k
 libmwaw                      x86_64 0.3.21-6.fc38               @fedora  6.7 M
 libnumbertext                x86_64 1.0.11-2.fc38               @fedora  752 k
 libodfgen                    x86_64 0.1.8-8.fc38                @fedora  753 k
 liborcus                     x86_64 0.17.2-8.fc38               @fedora  1.6 M
 libpagemaker                 x86_64 0.0.4-20.fc38               @fedora  163 k
 libqxp                       x86_64 0.0.2-21.fc38               @fedora  326 k
 libreoffice-core             x86_64 1:7.5.6.2-1.fc38            @updates 302 M
 libreoffice-filters          x86_64 1:7.5.6.2-1.fc38            @updates   0  
 libreoffice-gtk3             x86_64 1:7.5.6.2-1.fc38            @updates 2.3 M
 libreoffice-gtk4             x86_64 1:7.5.6.2-1.fc38            @updates 2.1 M
 libreoffice-help-en          x86_64 1:7.5.6.2-1.fc38            @updates  27 M
 libreoffice-langpack-en      x86_64 1:7.5.6.2-1.fc38            @updates 172 k
 libreoffice-ogltrans         x86_64 1:7.5.6.2-1.fc38            @updates 326 k
 libreoffice-opensymbol-fonts noarch 1:7.5.6.2-1.fc38            @updates 438 k
 libreoffice-pdfimport        x86_64 1:7.5.6.2-1.fc38            @updates 588 k
 libreoffice-pyuno            x86_64 1:7.5.6.2-1.fc38            @updates 1.7 M
 libreoffice-ure              x86_64 1:7.5.6.2-1.fc38            @updates 6.7 M
 libreoffice-x11              x86_64 1:7.5.6.2-1.fc38            @updates 610 k
 libreoffice-xsltfilter       x86_64 1:7.5.6.2-1.fc38            @updates 4.3 M
 librevenge                   x86_64 0.0.5-4.fc38                @fedora  757 k
 libstaroffice                x86_64 0.0.7-10.fc38               @fedora  2.3 M
 libvisio                     x86_64 0.1.7-18.fc38               @fedora  680 k
 libwpd                       x86_64 0.10.3-16.fc38              @fedora  728 k
 libwpg                       x86_64 0.3.3-15.fc38               @fedora  166 k
 libwps                       x86_64 0.4.13-2.fc38               @fedora  2.1 M
 libzmf                       x86_64 0.0.2-29.fc38               @fedora  185 k
 lpsolve                      x86_64 5.5.2.0-31.fc38             @fedora  1.2 M
 mariadb-connector-c          x86_64 3.3.5-1.fc38                @updates 580 k
 mariadb-connector-c-config   noarch 3.3.5-1.fc38                @updates 497  
 mythes                       x86_64 1.2.5-2.fc38                @fedora   28 k
 mythes-en                    noarch 3.0-35.fc38                 @fedora   21 M
 raptor2                      x86_64 2.0.15-37.fc38              @fedora  576 k
 rasqal                       x86_64 0.9.33-22.fc38              @fedora  887 k
 redland                      x86_64 1.0.17-33.fc38              @fedora  517 k
 xmlsec1-nss                  x86_64 1.2.37-2.fc38               @fedora  206 k
 zxing-cpp                    x86_64 1.2.0-9.fc38                @fedora  1.2 M

Transaction Summary
================================================================================
Remove  62 Packages

Freed space: 654 M
Is this ok [y/N]:

I guess I will need to just use your advice and leave it as it is.  I do not want to
remove libreoffice.  I use it.  Thanks to all who have explained how to deal with this
issue.  I had not encountered it before but was afraid to ask.


Best Regards,


Antonio

[Samuel Sieb]

On 9/26/23 11:12, olivares33561 via users wrote:
>  Transaction Summary
>  ================================================================================
>  Remove  62 Packages
>  
>  Freed space: 654 M
>  Is this ok [y/N]:
>  
>  I guess I will need to just use your advice and leave it as it is.  I do not want to
> remove libreoffice.  I use it.  Thanks to all who have explained how to deal with this
> issue.  I had not encountered it before but was afraid to ask. 
You could still try the alternatives option.
"alternatives --config java"

[Michael Hennebry]

On Tue, 26 Sep 2023, Samuel Sieb wrote:

>  On 9/26/23 11:12, olivares33561 via users wrote:
> > Transaction Summary
> > ================================================================================
> > Remove  62 Packages
> > 
> > Freed space: 654 M
> > Is this ok [y/N]:
> > 
> > I guess I will need to just use your advice and leave it as it is.  I do 
> > not want to remove libreoffice.  I use it.  Thanks to all who have 
> > explained how to deal with this issue.  I had not encountered it before but 
> > was afraid to ask.
>
>  You could still try the alternatives option.
>  "alternatives --config java" 
How would that work?
It seems to me he has no version 17 compiler
to go with the version 17 virtual machine.
If he has a version 21 virtual machine,
he could just soft link java21 to it.

-- 
Michael   hennebry(a)mail.cs.ndsu.NoDak.edu
"Occasionally irrational explanations are required"  --  Luke Roman

[Samuel Sieb]

On 9/26/23 15:47, Michael Hennebry wrote:
>  On Tue, 26 Sep 2023, Samuel Sieb wrote:
>  
> > On 9/26/23 11:12, olivares33561 via users wrote:
> >> Transaction Summary
> >> ================================================================================
> >> Remove  62 Packages
> >>
> >> Freed space: 654 M
> >> Is this ok [y/N]:
> >>
> >> I guess I will need to just use your advice and leave it as it is.  I 
> >> do not want to remove libreoffice.  I use it.  Thanks to all who have 
> >> explained how to deal with this issue.  I had not encountered it 
> >> before but was afraid to ask.
> >
> > You could still try the alternatives option.
> > "alternatives --config java"
>  
>  How would that work?
>  It seems to me he has no version 17 compiler
>  to go with the version 17 virtual machine.
>  If he has a version 21 virtual machine,
>  he could just soft link java21 to it. 
That's basically what my suggestion does.  I'm not saying to change the 
compiler.  The command I gave him gives the option to set the default 
"java" command to be the 21 version.  Note the difference between 
"javac" and "java".

[Michael Hennebry]

On Tue, 26 Sep 2023, olivares33561 via users wrote:

>  [olivares@fedora mptmp]$ rpm -qa | grep openjdk
>  java-17-openjdk-headless-17.0.8.0.7-1.fc38.x86_64
>  java-latest-openjdk-headless-21.0.0.0.35-1.rolling.fc38.x86_64
>  java-latest-openjdk-21.0.0.0.35-1.rolling.fc38.x86_64
>  java-latest-openjdk-devel-21.0.0.0.35-1.rolling.fc38.x86_64
>  [olivares@fedora mptmp]$ javac Ulam.java --release 17
>  [olivares@fedora mptmp]$ java Ulam 
>  Is there a better way to avoid doing this, ie removing java 17 and
> forcing 21 ?  or vice versa to avoid this.  I had not encountered this before in previous
> versions of Fedora it just worked!  Now I have to specify.  What would be the best thing
> to do? and make it work correctly. 
I'd expect that within any sensible system,
the java compiler and the java
virtual machine would be compatible.
The package java-17... seems to be an outlier and
seems to be where the java virtual machine is coming from.
If another package has a headless virtual machine,
you might want to get rid of java-17... .

-- 
Michael   hennebry(a)mail.cs.ndsu.NoDak.edu
"Occasionally irrational explanations are required"  --  Luke Roman