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------- Original Message -------
On Tuesday, September 26th, 2023 at 12:03 PM, Samuel Sieb <sam...@sieb.net>
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
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