With excitement I downloaded Java 17 today and got a simple record class
public record TestCls(Party producer, Party client, Party server) {}
However when doing mvn compile, it throws me error
Fatal error compiling: javax.lang.model.element.UnknownElementException: Unknown element: "com.xxx.TestCls"
I double checked java -version and it looks right to me:
openjdk version "17" 2021-09-14 OpenJDK Runtime Environment (build 17+35-2724) OpenJDK 64-Bit Server VM (build 17+35-2724, mixed mode, sharing)
Would anyone have a clue? Thanks in advance!
Supplements:
my maven version is 3.5.4.
maven settings in pom file:
<properties>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
I’m using Intellij 2021.1.2 on M1 chip. But I tried mvn compile in terminal and it gives me same error.
The Party class is defined in the same project.
The whole pom file:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.xxx</groupId>
<artifactId>xxx</artifactId>
<version>1.0.1-SNAPSHOT</version>
<name>xxx</name>
<dependencies>
<dependency>
<artifactId>spring-boot-starter</artifactId>
<groupId>org.springframework.boot</groupId>
<scope>provided</scope>
<version>2.5.1</version>
</dependency>
<dependency>
<artifactId>spring-webmvc</artifactId>
<groupId>org.springframework</groupId>
<version>5.3.8</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<version>2.4.2</version>
</dependency>
...
</dependencies>
<properties>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<repositories>
<repository>
<id>maven-snapshots</id>
<url>...</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>maven-releases</id>
<url>...</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<distributionManagement>
<repository>
<id>maven-releases</id>
<url>...</url>
</repository>
<snapshotRepository>
<id>maven-snapshots</id>
<url>...</url>
</snapshotRepository>
</distributionManagement>
</project>
and the stacktrace with mvn compile -e:
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project reporting-event-spring-boot-starter: Fatal error compiling: javax.lang.model.element.UnknownElementException: Unknown element: "com.xxx.TestCls" -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project reporting-event-spring-boot-starter: Fatal error compiling
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:213)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:154)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:146)
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:954)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:568)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
Caused by: org.apache.maven.plugin.MojoExecutionException: Fatal error compiling
at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute (AbstractCompilerMojo.java:796)
at org.apache.maven.plugin.compiler.CompilerMojo.execute (CompilerMojo.java:129)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:154)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:146)
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:954)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:568)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
Caused by: org.codehaus.plexus.compiler.CompilerException: javax.lang.model.element.UnknownElementException: Unknown element: "com.xxx.TestCls"
at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess (JavaxToolsCompiler.java:191)
at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile (JavacCompiler.java:169)
at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute (AbstractCompilerMojo.java:785)
at org.apache.maven.plugin.compiler.CompilerMojo.execute (CompilerMojo.java:129)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:154)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:146)
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:954)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:568)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
Caused by: java.lang.RuntimeException: javax.lang.model.element.UnknownElementException: Unknown element: "com.xxx.TestCls"
at com.sun.tools.javac.api.JavacTaskImpl.invocationHelper (JavacTaskImpl.java:168)
at com.sun.tools.javac.api.JavacTaskImpl.doCall (JavacTaskImpl.java:100)
at com.sun.tools.javac.api.JavacTaskImpl.call (JavacTaskImpl.java:94)
at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess (JavaxToolsCompiler.java:126)
at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile (JavacCompiler.java:169)
at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute (AbstractCompilerMojo.java:785)
at org.apache.maven.plugin.compiler.CompilerMojo.execute (CompilerMojo.java:129)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:154)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:146)
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:954)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:568)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
Caused by: javax.lang.model.element.UnknownElementException: Unknown element: "com.xxx.TestCls"
at javax.lang.model.util.AbstractElementVisitor6.visitUnknown (AbstractElementVisitor6.java:129)
at javax.lang.model.util.ElementKindVisitor6.visitTypeAsRecord (ElementKindVisitor6.java:231)
at javax.lang.model.util.ElementKindVisitor6.visitType (ElementKindVisitor6.java:160)
at com.sun.tools.javac.code.Symbol$ClassSymbol.accept (Symbol.java:1561)
at org.hibernate.validator.ap.ConstraintValidationProcessor.process (ConstraintValidationProcessor.java:119)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor (JavacProcessingEnvironment.java:1023)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs (JavacProcessingEnvironment.java:939)
at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run (JavacProcessingEnvironment.java:1267)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing (JavacProcessingEnvironment.java:1382)
at com.sun.tools.javac.main.JavaCompiler.processAnnotations (JavaCompiler.java:1234)
at com.sun.tools.javac.main.JavaCompiler.compile (JavaCompiler.java:916)
at com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0 (JavacTaskImpl.java:104)
at com.sun.tools.javac.api.JavacTaskImpl.invocationHelper (JavacTaskImpl.java:152)
at com.sun.tools.javac.api.JavacTaskImpl.doCall (JavacTaskImpl.java:100)
at com.sun.tools.javac.api.JavacTaskImpl.call (JavacTaskImpl.java:94)
at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess (JavaxToolsCompiler.java:126)
at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile (JavacCompiler.java:169)
at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute (AbstractCompilerMojo.java:785)
at org.apache.maven.plugin.compiler.CompilerMojo.execute (CompilerMojo.java:129)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:154)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:146)
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:954)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:568)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
[ERROR]
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
Posting ChatGPT’s answer here: It looks like you are using an older version of Maven (3.5.4) that does not support the new features introduced in Java 17, such as records. In order to use Java 17 features with Maven, you will need to use a more recent version of Maven that includes support for Java 17.
You can check the compatibility of Maven versions with Java versions in the Maven documentation [1]. According to the documentation, Maven 3.6.3 and later versions support Java 17.
Therefore, to use Java 17 features with Maven, you will need to upgrade to a more recent version of Maven, such as version 3.6.3 or later. Once you have upgraded to a compatible version of Maven, you should be able to compile and use your record class without encountering the Unknown element error.
[1] https://maven.apache.org/docs/history.html#Java_Versions
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Answer
Clearly it would be safer to upgrade the version of Maven and the maven-compiler-plugin as recommended in the comments. Nevertheless the interesting part in the compiler error stack trace is:
Caused by: javax.lang.model.element.UnknownElementException: Unknown element: "com.xxx.TestCls"
at javax.lang.model.util.AbstractElementVisitor6.visitUnknown (AbstractElementVisitor6.java:129)
at javax.lang.model.util.ElementKindVisitor6.visitTypeAsRecord (ElementKindVisitor6.java:231)
at javax.lang.model.util.ElementKindVisitor6.visitType (ElementKindVisitor6.java:160)
at com.sun.tools.javac.code.Symbol$ClassSymbol.accept (Symbol.java:1561)
at org.hibernate.validator.ap.ConstraintValidationProcessor.process (ConstraintValidationProcessor.java:119)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor (JavacProcessingEnvironment.java:1023)
It seems to me that org.hibernate.validator.ap.ConstraintValidationProcessor is invoking a visitor that is of type ConstraintAnnotationVisitor which itself extends AbstractElementVisitor which in turn extends ElementKindVisitor8. The latter is coming from the JDK and seems targeting Java 8 source, whereas records appear to be supported by AbstractElementVisitor14.
This leads me to doubt that this could be an issue in hibernate-validator’s ConstraintAnnotationVisitor which does not support records? Maybe an issue on their GitHub repo with a more complete reproduction would help more.