how to fix java.lang.ClassNotFoundException: kotlin.String

Question

I'm trying to load kotlin.String using SystemClassLoader

        inputClassName = String::class.qualifiedName.toString()
        val input = ClassLoader.getSystemClassLoader()
            .loadClass(inputClassName) // here I get error

and I'm getting error. Stack trace:

Exception in thread "main" java.lang.ClassNotFoundException: kotlin.String
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    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 block.execution.Executor.init(Executor.kt:40)
    at block.AppKt.main(App.kt:50)

What am I doing wrong? How can I fix it?

It sounds like you are missing the kotlin dependencies from your runtime classpath. — Stephen C
– Stephen C, Commented May 3, 2020 at 3:40
I'm just curious, why there's a need to load String once there's already String::class? — Mikhail Kopylov
– Mikhail Kopylov, Commented May 3, 2020 at 4:26
@StephenC No, this will happen even if Kotlin dependencies are in the classpath. — Alexey Romanov
– Alexey Romanov, Commented May 3, 2020 at 7:58
@MikhailKopylov this is just a simplified example. I need to dynamically load classes that the users asks for — Alex
– Alex, Commented May 4, 2020 at 14:00

Alexey Romanov · Accepted Answer · 2020-05-03 07:56:16Z

4

kotlin.String doesn't exist as a class which can be loaded, it is mapped to java.lang.String by the compiler. String::class.java.name will give you the actual name of the class.

Of course, as Mikhail Kopylov points out, there is little point loading a class by name of an already loaded class. Maybe to load it in a specific ClassLoader, but String will definitely be loaded by the system class loader anyway.

answered May 3, 2020 at 7:56

Alexey Romanov

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Alexey Romanov Over a year ago

Then consider accepting it (see stackoverflow.com/help/someone-answers).

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