Kotlin does not work. Unable to programming

[Yczo]

Hi, (Thanks in advance)

my first chance was install the Kotlin plugin on eclipse cdt.

Hello World did work:

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fun main(param: Array<String>) {
	println("Hello World")
}

But when I tried to enlarge it to work with val and var:

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fun main(param: Array<String>) {
	println("Hello World 2")
	
	val one: Int = 1
	val two: Int = 2		
	var res: Int = one + two
	
	//println(res)
}

I got the next report:

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ERROR: Cannot access 'java.io.Serializable' which is a supertype of 'kotlin.Int'. Check your module classpath for missing or conflicting dependencies (10, 21)

//------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

My second chance was idea-community (IntelliJ-IDEA).

When I tried to execute it, I got:

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Error occurred during initialization of VM
java.lang.UnsupportedClassVersionError: com/intellij/util/lang/PathClassLoader has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:757)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:419)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:352)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at java.lang.SystemClassLoaderAction.run(ClassLoader.java:2214)
	at java.lang.SystemClassLoaderAction.run(ClassLoader.java:2200)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.lang.ClassLoader.initSystemClassLoader(ClassLoader.java:1450)
	at java.lang.ClassLoader.getSystemClassLoader(ClassLoader.java:1430)

I thought, the issue could be on my jvm version

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$ eselect java-vm list
Available Java Virtual Machines:
  [1]   icedtea-8  system-vm
  [2]   openjdk-bin-8 

I got the same error in icedtea-8 as in the openjdk. Both are the version 8.

Although I have the 11 version installed, it's not displayed by eselect. I wonder why.

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[I] dev-java/openjdk-bin
     Available versions:  
     (8)    8.292_p10^s ~8.302_p08^s
     (11)   11.0.11_p9-r1 (~)11.0.12_p7
       {alsa cups examples +gentoo-vm headless-awt selinux source}
     Installed versions:  8.292_p10(8)^s(12:24:15 05.09.2021)(alsa cups -examples -headless-awt -selinux -source) 11.0.12_p7(11)(12:19:45 05.09.2021)(alsa cups -gentoo-vm -headless-awt -selinux -source)
     Homepage:            https://adoptium.net
     Description:         Prebuilt Java JDK binaries provided by Eclipse Temurin

[I] dev-java/openjdk-jre-bin
     Available versions:  
     (8)    8.292_p10 ~8.302_p08
     (11)   ~11.0.11_p9 (~)11.0.12_p7
       {alsa cups +gentoo-vm headless-awt selinux}
     Installed versions:  11.0.12_p7(11)(12:19:39 05.09.2021)(alsa cups -gentoo-vm -headless-awt -selinux)
     Homepage:            https://adoptium.net
     Description:         Prebuilt Java JRE binaries provided by Eclipse Temurin

Should I install the oracle-jvm?

Any help will be welcomed

[fedeliallalinea]

Although I have the 11 version installed, it's not displayed by eselect. I wonder why.

Because gentoo-vm use flag on dev-java/openjdk:11 is masked, you can umask it using /etc/portage/profile/package.use.mask

[papas]

You dont need to change your system vm, you can download any jdk you want and set your ide to use it. Any library you need you can add it to your project. I use netbeans and intellij with jdk 14.