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[BUG] Lombok 1.18.46 fails on JDK 27: ClassNotFoundException com.sun.tools.javac.tree.EndPosTable #4072
Description
Describe the bug
Lombok 1.18.46 does not work on JDK 27. LombokProcessor.init() throws ExceptionInInitializerError, caused by a ClassNotFoundException for com.sun.tools.javac.tree.EndPosTable, which was removed in JDK 27:
- JDK 26: https://github.com/openjdk/jdk/blob/jdk26/src/jdk.compiler/share/classes/com/sun/tools/javac/tree/EndPosTable.java
- JDK 27: https://github.com/openjdk/jdk/blob/jdk27/src/jdk.compiler/share/classes/com/sun/tools/javac/tree/EndPosTable.java (404)
Since this happens during processor initialization, all compilation fails — including files with no Lombok annotations.
To Reproduce
Example.java:
import lombok.Getter;
public class Example {
@Getter private String name;
}javac -proc:full -cp lombok.jar Example.java
An annotation processor threw an uncaught exception.
Consult the following stack trace for details.
java.lang.ExceptionInInitializerError
at lombok.javac.apt.LombokProcessor.placePostCompileAndDontMakeForceRoundDummiesHook(LombokProcessor.java:174)
at lombok.javac.apt.LombokProcessor.init(LombokProcessor.java:96)
at lombok.core.AnnotationProcessor$JavacDescriptor.want(AnnotationProcessor.java:160)
at lombok.core.AnnotationProcessor.init(AnnotationProcessor.java:213)
at lombok.launch.AnnotationProcessorHider$AnnotationProcessor.init(AnnotationProcessor.java:64)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$ProcessorState.<init>(JavacProcessingEnvironment.java:633)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$DiscoveredProcessors$ProcessorStateIterator.next(JavacProcessingEnvironment.java:757)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:852)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1183)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1304)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1265)
Caused by: java.lang.ClassNotFoundException: com.sun.tools.javac.tree.EndPosTable
at java.base/java.lang.ClassLoader.findClass(ClassLoader.java:685)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:569)
at lombok.launch.ShadowClassLoader.loadClass(ShadowClassLoader.java:565)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:502)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:479)
at java.base/java.lang.Class.forName(Class.java:469)
at lombok.javac.Javac.getMethod(Javac.java:260)
at lombok.javac.Javac.<clinit>(Javac.java:223)
... 16 more
No class file is produced.
Expected behavior
Example.java compiles and Example gets a generated getName(), as it does on JDK 26 and earlier.
Version info (please complete the following information):
- Lombok version: 1.18.46
- Platform: javac,
javac 27(openjdk version "27" 2026-09-15, build27+35-2325,openjdk-27_macos-aarch64_bin.tar.gzfrom download.java.net), macOS aarch64
Additional context
- JDK 25 and 26 are unaffected; the same file compiles and the getter is generated.
- Also fails under Gradle 9.7 with a Java 27 toolchain.
Reacted by Jasper de Vries
Activity
Rawi01 commentedon Aug 23, 2026
Thanks for the report.
This is caused by this PR and requires multiple changes in lombok.
danishnawab commentedon Aug 24, 2026
@Rawi01 I made an attempt to resolve this problem: https://github.com/projectlombok/lombok/pull/4074/changes
Disclosure: I used AI to help understand the existing code base as well as brainstorm various design choices.
rzwitserloot commentedon Aug 27, 2026
Seems like the end pos table thing that @danishnawab fixed was the only holdup; we already updated the ASM dep earlier.
edge release with the JDK27 update is live. We intend to push that out as lombok v1.18.48 soon (before the release of JDK27 proper on 2026-09-15).
Support JDK27: end positions moved from EndPosTable to JCTree.endpos
mmoayyed commentedon Sep 2, 2026
Wanted to confirm that JDK 27 builds with the latest Lombok version now pass for my builds. Thank you all for handling this ahead of the actual JDK release.