Update

examples/nbproject/project.properties

@@ -93,7 +93,7 @@ main.class=TcpExamples.TcpExample1Telnet
 manifest.file=manifest.mf
 meta.inf.dir=${src.dir}/META-INF
 mkdist.disabled=false
-platform.active=default_platform
+platform.active=JDK_22
 run.classpath=\
     ${javac.classpath}:\
     ${build.classes.dir}

examples/nbproject/project.xml

@@ -4,6 +4,7 @@
     <configuration>
         <data xmlns="http://www.netbeans.org/ns/j2se-project/3">
             <name>Networked Graphics MV3500 examples</name>
+            <explicit-platform explicit-source-supported="true"/>
             <source-roots>
                 <root id="src.dir"/>
                 <root id="src.src.dir"/>