Exception in thread "main" java.lang.NoClassDefFoundError: kotlin/TypeCastException

Support
1

I got the below error:

Hasans-Air:read-pdf hasan$ java -cp pdf.jar hasan.pdf.MainKt
Hello Kotlin
Exception in thread "main" java.lang.NoClassDefFoundError: kotlin/TypeCastException
	at hasan.pdf.MainKt.main(main.kt:5)
	at hasan.pdf.MainKt.main(main.kt)
Caused by: java.lang.ClassNotFoundException: kotlin.TypeCastException
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:604)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
	... 2 more
Hasans-Air:read-pdf hasan$

While running the command:

$ java -cp pdf.jar hasan.pdf.MainKt

My Kotlin code is:

// main.kt
package hasan.pdf

fun main(){
    println("Hello Kotlin")
    ReadPdf.main()
}

And

// ReadPdf.kt
package hasan.pdf

import org.apache.pdfbox.pdmodel.PDDocument
import org.apache.pdfbox.text.PDFTextStripper
import org.apache.pdfbox.text.PDFTextStripperByArea

import java.io.File
import java.io.IOException

object ReadPdf {

    @Throws(IOException::class)
    @JvmStatic
    fun main() {

        PDDocument.load(File("HasanResume.pdf")).use { document ->

            document.javaClass

            if (!document.isEncrypted) {

                val stripper = PDFTextStripperByArea()
                stripper.sortByPosition = true

                val tStripper = PDFTextStripper()

                val pdfFileInText = tStripper.getText(document)
                //System.out.println("Text:" + st);

                // split by whitespace
                val lines = pdfFileInText.split("\\r?\\n".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
                for (line in lines) {
                    println(line)
                }
            }
        }
    }
}

And

// build.gradle.kts
import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    java
    kotlin("jvm") version "1.3.50"
}

group = "hasan.pdf"
version = "1.0-SNAPSHOT"

repositories {
    mavenCentral()
}

dependencies {
    implementation(kotlin("stdlib-jdk8"))
    implementation("org.apache.pdfbox:pdfbox:2.0.17")
    testCompile("junit", "junit", "4.12")
}

configure<JavaPluginConvention> {
    sourceCompatibility = JavaVersion.VERSION_1_8
}
tasks.withType<KotlinCompile> {
    kotlinOptions.jvmTarget = "1.8"
}
2

That means that kotlin.TypeCastException isn’t on the classpath (or in pdf.jar).

You should either add the kotlin std libs jar to the class path or create a fat jar with all the classes you need.

3

mm, how to do both options?

1 Like
4

as for fat jar: it should suffice to change:

implementation(kotlin(“stdlib-jdk8”))

to:

compile(kotlin(“stdlib-jdk8”))

in my project I have:

dependencies { compile “org.jetbrains.kotlin:kotlin-stdlib-jdk8”
}