Upgrade to Kotlin 1.6

[abremora]

Description

Build fails with IntelliJ on Windows with following error:

Compilation failure
[INFO] --- kotlin-maven-plugin:1.4.31:compile (compile) @ spring-vault-core ---
[ERROR] java.lang.ExceptionInInitializerError
	at com.intellij.pom.java.LanguageLevel.<clinit>(LanguageLevel.java:25)
	at com.intellij.core.CoreLanguageLevelProjectExtension.<init>(CoreLanguageLevelProjectExtension.java:26)
	at com.intellij.core.JavaCoreProjectEnvironment.<init>(JavaCoreProjectEnvironment.java:42)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreProjectEnvironment.<init>(KotlinCoreProjectEnvironment.kt:26)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment$ProjectEnvironment.<init>(KotlinCoreEnvironment.kt:121)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment$Companion.createForProduction(KotlinCoreEnvironment.kt:425)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.createCoreEnvironment(K2JVMCompiler.kt:226)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:152)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:52)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:88)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:44)
	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:98)
	at org.jetbrains.kotlin.maven.KotlinCompileMojoBase.execCompiler(KotlinCompileMojoBase.java:228)
	at org.jetbrains.kotlin.maven.K2JVMCompileMojo.execCompiler(K2JVMCompileMojo.java:237)
	at org.jetbrains.kotlin.maven.K2JVMCompileMojo.execCompiler(K2JVMCompileMojo.java:55)
	at org.jetbrains.kotlin.maven.KotlinCompileMojoBase.execute(KotlinCompileMojoBase.java:209)
	at org.jetbrains.kotlin.maven.K2JVMCompileMojo.execute(K2JVMCompileMojo.java:222)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:210)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:156)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:148)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:56)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:305)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:192)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:105)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:957)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:289)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:193)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:567)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:282)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:225)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:406)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347)
	at org.codehaus.classworlds.Launcher.main(Launcher.java:47)
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected void java.util.ResourceBundle.setParent(java.util.ResourceBundle) accessible: module java.base does not "opens java.util" to unnamed module @671ba0dc
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357)
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
	at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
	at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
	at com.intellij.util.ReflectionUtil.makeAccessible(ReflectionUtil.java:252)
	at com.intellij.util.ReflectionUtil.getDeclaredMethod(ReflectionUtil.java:269)
	at com.intellij.DynamicBundle.<clinit>(DynamicBundle.java:22)
	... 40 more

Solution

See:

• https://youtrack.jetbrains.com/issue/IDEA-269342
• https://youtrack.jetbrains.com/issue/KT-47094

Update pom.xml to:

<kotlin.version>1.6.10</kotlin.version>
<kotlin-coroutines.version>1.6.0</kotlin-coroutines.version>

Environment

IntelliJ IDEA 2021.3.1 (Community Edition)
Build #IC-213.6461.79, built on December 28, 2021
Runtime version: 11.0.13+7-b1751.21 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Windows 11 10.0
GC: G1 Young Generation, G1 Old Generation
Memory: 2034M
Cores: 8
Non-Bundled Plugins:
MavenRunHelper (4.19.212.000.1)

Kotlin: 213-1.5.10-release-949-IJ6461.79

[mp911de]

The issue above is an IDE issue and upgrading a project is rarely a good fix. In any case, upgrading to Kotlin 1.6 makes sense on its own.