Re: Help please!

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I've recompiled using Java 11 as you mentioned.Now the robot is shown with=
=20
the package name in the robot list.But after selecting it,when I start the=
=20
battle,my robot is not shown in game.

On Wednesday, August 7, 2024 at 12:54:58=E2=80=AFAM UTC+6 fnl wrote:

> It is a very cryptic message at first. It seems that the robot your are=
=20
> trying to run has been compiled with Java class file version 65=20
> <https://stackoverflow.com/questions/9170832/list-of-java-class-file-form=
at-major-version-numbers> which=20
> means *Java 21*.
> But you are running the Robot on a Java version, the supports up to Java=
=20
> class file version 52=20
> <https://stackoverflow.com/questions/9170832/list-of-java-class-file-form=
at-major-version-numbers>=20
> which means up to *Java 8* (aka Java 1.8)
>
> In short this means that you are probably running Robocode with Java 8=20
> from inside IntelliJ, which does not support Java 21, which is many=20
> versions newer.
> I recommend that you switch to a newer JDK (Java Developer Kit), which=20
> should be *version 21* as minimum for running your robot.
> You do this in IntelliJ from the menu: File -> Project Structure... ->=20
> Platform Settings / SDKs. Then you should "Add New SDK" by pressing the=
=20
> plus (+) symbol and select *Download SDK* and select version 21 (or=20
> newer) and choose e.g. Oracle OpenJDK 21, or alternatively *Add SDK* if=
=20
> you already have Java 21 or never installed somewhere on your system.
>
> Alternatively, you can recompile your robot using an older Java version,=
=20
> e.g. Java 11, which is the minimum requirement for running the newest=20
> Robocode version.
>
> I hope this helps? =F0=9F=99=82
> tirsdag den 6. august 2024 kl. 20.37.25 UTC+2 skrev [email protected]:
>
>> [image: Capture1.PNG]
>> I've made my 1st robot in IntelliJ idea but when I open robocode, this=
=20
>> error message is shown. How to fix it?
>
>

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I've recompiled using Java 11 as you mentioned.Now the robot is shown with =
the package name in the robot list.But after selecting it,when I start the =
battle,my robot is not shown in game.<br /><br /><div class=3D"gmail_quote"=
><div dir=3D"auto" class=3D"gmail_attr">On Wednesday, August 7, 2024 at 12:=
54:58=E2=80=AFAM UTC+6 fnl wrote:<br/></div><blockquote class=3D"gmail_quot=
e" style=3D"margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204);=
 padding-left: 1ex;">It is a very cryptic message at first. It seems that t=
he robot your are trying to run has been compiled with <a href=3D"https://s=
tackoverflow.com/questions/9170832/list-of-java-class-file-format-major-ver=
sion-numbers" target=3D"_blank" rel=3D"nofollow" data-saferedirecturl=3D"ht=
tps://www.google.com/url?hl=3Den&amp;q=3Dhttps://stackoverflow.com/question=
s/9170832/list-of-java-class-file-format-major-version-numbers&amp;source=
=3Dgmail&amp;ust=3D1723118921582000&amp;usg=3DAOvVaw0l_yXK-uFn7QOshcsvDQlM"=
>Java class file version 65</a>=C2=A0which means <b>Java 21</b>.<div>But yo=
u are running the Robot on a Java version, the supports up to <a href=3D"ht=
tps://stackoverflow.com/questions/9170832/list-of-java-class-file-format-ma=
jor-version-numbers" target=3D"_blank" rel=3D"nofollow" data-saferedirectur=
l=3D"https://www.google.com/url?hl=3Den&amp;q=3Dhttps://stackoverflow.com/q=
uestions/9170832/list-of-java-class-file-format-major-version-numbers&amp;s=
ource=3Dgmail&amp;ust=3D1723118921582000&amp;usg=3DAOvVaw0l_yXK-uFn7QOshcsv=
DQlM">Java class file version 52</a> which means up to <b>Java 8</b> (aka J=
ava 1.8)<br><br></div><div>In short this means that you are probably runnin=
g Robocode with Java 8 from inside IntelliJ, which does not support Java 21=
, which is many versions newer.<br>I recommend that you switch to a newer J=
DK (Java Developer Kit), which should be <b>version 21</b> as minimum for r=
unning your robot.<br>You do this in IntelliJ from the menu: File -&gt; Pro=
ject Structure... -&gt; Platform Settings / SDKs. Then you should &quot;Add=
 New SDK&quot; by pressing the plus (+) symbol and select <b>Download SDK</=
b> and select version 21 (or newer) and choose e.g. Oracle OpenJDK 21, or a=
lternatively <b>Add SDK</b>=C2=A0if you already have Java 21 or never insta=
lled somewhere on your system.<br><br>Alternatively, you can recompile your=
 robot using an older Java version, e.g. Java 11, which is the minimum requ=
irement for running the newest Robocode version.<br><br>I hope this helps? =
=F0=9F=99=82</div><div class=3D"gmail_quote"><div dir=3D"auto" class=3D"gma=
il_attr">tirsdag den 6. august 2024 kl. 20.37.25 UTC+2 skrev <a href data-e=
mail-masked rel=3D"nofollow">[email protected]</a>:<br></div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0 0 0 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><img alt=3D"Capture1.PNG" width=3D"550px" =
height=3D"13px" src=3D"https://groups.google.com/group/robocode/attach/3b7a=
b209c7115/Capture1.PNG?part=3D0.1&amp;view=3D1"><br>I&#39;ve made my 1st ro=
bot in IntelliJ idea but when I open robocode, this error message is shown.=
 How to fix it?</blockquote></div></blockquote></div>

<p></p>

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/>

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