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I'm getting this error while trying to compile a K...
# javascript
d
I'm getting this error while trying to compile a Kotlin / JS module that has exports in it (this did not happen before I tried to export all the classes in the library. Also, there are no warnings, only this error. Does anyone know how to track it down?
Copy code
: java.lang.NullPointerException
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.exportClass(ExportModelGenerator.kt:449)
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.exportOrdinaryClass(ExportModelGenerator.kt:253)
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.exportClass(ExportModelGenerator.kt:73)
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.exportDeclaration(ExportModelGenerator.kt:61)
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.generateExport(ExportModelGenerator.kt:37)
	at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.generateExportWithExternals(IrModuleToJsTransformer.kt:192)
	at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.associateIrAndExport(IrModuleToJsTransformer.kt:123)
	at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.makeJsCodeGenerator(IrModuleToJsTransformer.kt:168)
	at org.jetbrains.kotlin.cli.js.K2JsIrCompiler$Ir2JsTransformer.makeJsCodeGenerator(K2JsIrCompiler.kt:156)
	at org.jetbrains.kotlin.cli.js.K2JsIrCompiler$Ir2JsTransformer.compileAndTransformIrNew(K2JsIrCompiler.kt:160)
	at org.jetbrains.kotlin.cli.js.K2JsIrCompiler.doExecute(K2JsIrCompiler.kt:403)
	at org.jetbrains.kotlin.cli.js.K2JSCompiler.doExecute(K2JSCompiler.java:181)
	at org.jetbrains.kotlin.cli.js.K2JSCompiler.doExecute(K2JSCompiler.java:72)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:100)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:46)
	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1486)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
	at java.base/java.lang.reflect.Method.invoke(Method.java:578)
	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:360)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:712)
	at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:598)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:844)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:721)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:720)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.lang.Thread.run(Thread.java:1589)
a
Hey, could you please share the version of the compiler?
c
You should probably report it to https://kotl.in/issue to ensure the team sees it
i
is it a big project with lots and lots of exports? if not I would try adding them one or two at a time and see where you start getting the error, maybe
d
It's a huge project with a lot of exports. The divide and conquer method would be onerous. I might have to do it though.
Compiler version: 1.8.10 Language version: 1.9 API version: 1.9 Target JVM version: 1.8
a
Is it possible for you to try 1.9.0-RC compiler version just to check if the problem exists?
d
Same error
I'll try to see if I can track it down. There's no way for it to spit out exactly where in the code that it's try to compile it's running into this issue?
a
Could you show the error stack for 1.9.0-RC? I could help you to find the place of the error
d
I only have to change the compiler version in the settings, correct? Could it be overwritten elsewhere?
Copy code
e: java.lang.NullPointerException
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.exportClass(ExportModelGenerator.kt:449)
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.exportOrdinaryClass(ExportModelGenerator.kt:253)
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.exportClass(ExportModelGenerator.kt:73)
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.exportDeclaration(ExportModelGenerator.kt:61)
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.generateExport(ExportModelGenerator.kt:37)
	at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.generateExportWithExternals(IrModuleToJsTransformer.kt:192)
	at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.associateIrAndExport(IrModuleToJsTransformer.kt:123)
	at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.makeJsCodeGenerator(IrModuleToJsTransformer.kt:168)
	at org.jetbrains.kotlin.cli.js.K2JsIrCompiler$Ir2JsTransformer.makeJsCodeGenerator(K2JsIrCompiler.kt:156)
	at org.jetbrains.kotlin.cli.js.K2JsIrCompiler$Ir2JsTransformer.compileAndTransformIrNew(K2JsIrCompiler.kt:160)
	at org.jetbrains.kotlin.cli.js.K2JsIrCompiler.doExecute(K2JsIrCompiler.kt:403)
	at org.jetbrains.kotlin.cli.js.K2JSCompiler.doExecute(K2JSCompiler.java:181)
	at org.jetbrains.kotlin.cli.js.K2JSCompiler.doExecute(K2JSCompiler.java:72)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:100)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:46)
	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1486)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
	at java.base/java.lang.reflect.Method.invoke(Method.java:578)
	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:360)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:712)
	at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:598)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:844)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:721)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:720)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.lang.Thread.run(Thread.java:1589)
Identical to before I believe
a
I think you also should to change the compiler version for the "multiplatform" plugin:
Copy code
plugins {
    kotlin("multiplatform") version "1.9.0" // <- here
}
d
kotlin("multiplatform") version Versions.kotlinVersion apply false
Not sure what that exactly means
Looks like there is a file that sets the versions.
val kotlinVersion = "1.8.21" val kotlinCoroutinesVersion = "1.7.1" val kotlinSerializationVersion = "1.5.0" val dokkaVersion = "1.8.10"
I'll try to change kotlin version to 1.9.0
...and same error
This library has multiple modules. The module with the exports builds. Other modules warned me that they needed the 
@OptIn(kotlin.js.ExperimentalJsExport::class)
flag. It's those other modules that are having issues.
a
The stack could be so useful to indicate at least the declaration which created such a crush.
Are there many `object`s with the @JsExport in your project?
d
It doesn't really give me more information. Running with --stacktrace
Copy code
kotlin version: 1.9.0
error message: java.lang.NullPointerException
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.exportClass(ExportModelGenerator.kt:448)
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.exportOrdinaryClass(ExportModelGenerator.kt:252)
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.exportClass(ExportModelGenerator.kt:72)
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.exportDeclaration(ExportModelGenerator.kt:60)
	at org.jetbrains.kotlin.ir.backend.js.export.ExportModelGenerator.generateExport(ExportModelGenerator.kt:36)
	at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.generateExportWithExternals(IrModuleToJsTransformer.kt:189)
	at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.associateIrAndExport(IrModuleToJsTransformer.kt:124)
	at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.makeJsCodeGenerator(IrModuleToJsTransformer.kt:165)
	at org.jetbrains.kotlin.cli.js.K2JsIrCompiler$Ir2JsTransformer.makeJsCodeGenerator(K2JsIrCompiler.kt:136)
	at org.jetbrains.kotlin.cli.js.K2JsIrCompiler$Ir2JsTransformer.compileAndTransformIrNew(K2JsIrCompiler.kt:140)
	at org.jetbrains.kotlin.cli.js.K2JsIrCompiler.doExecute(K2JsIrCompiler.kt:393)
	at org.jetbrains.kotlin.cli.js.K2JSCompiler.doExecute(K2JSCompiler.java:181)
	at org.jetbrains.kotlin.cli.js.K2JSCompiler.doExecute(K2JSCompiler.java:72)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:100)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:46)
	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1497)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
	at java.base/java.lang.reflect.Method.invoke(Method.java:578)
	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:360)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:712)
	at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:598)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:844)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:721)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:720)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.lang.Thread.run(Thread.java:1589)
👀 1
a
By the stack, the problem in some of the 
object
s with the @JsExport annotation
d
Interesting. I'll go through and disable exports on the objects then and see if that helps.
✅ 1
I removed the exports from all the objects (but it did tell me I had to add 
@OptIn(kotlin.js.ExperimentalJsExport::class)
) and it still fails
Does the optin actually export as well?
If I don't do the opt-in it gives me a warning
Hmm... I may have missed some.
Huh. Ok. I resolved one. Let's see where it happened and if I can reproduce it
Ack. I didn't resolve it. Built the wrong module.
a
1.9.0 is out also, have you tried with it ?
d
Yes. Artem mentioned that earlier in the thread.
👌 1
Does 
@OptIn(kotlin.js.ExperimentalJsExport::class)
do an export?
a
No, it should just give an ability to use @JsExport
d
I have a module that has no @JsExport that still fails like this... is it because perhaps it has a dependency on a module that does have an export?
a
It could be
I will try to investigate the problem to fix it as soon as possible. Could you please make a YouTrack ticket on it?
d
Sure.
Done.
a
Also, assign it please on me
d
I don't have permission apparently.
The user is "me". An unfortunate side-effect of my email address.
a
I see, in this case just send me the link to the ticket.
Thank you so much, we will try to do our best to fix it until the next release
d
No problem.
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