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  1. JDK
  2. JDK-8249780

NullPointerException when processing a field annotation inside a record class

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    • x86_64
    • linux_ubuntu, windows_10
    • Verified

      ADDITIONAL SYSTEM INFORMATION :
      $ uname -a
      Linux Nelkinda-Blade-Stealth-2 5.4.0-40-generic #44-Ubuntu SMP Tue Jun 23 00:01:04 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
      $ lsb_release -a
      No LSB modules are available.
      Distributor ID: Ubuntu
      Description: Ubuntu 20.04 LTS
      Release: 20.04
      Codename: focal
      $ /opt/java/jdk-14.0.2/bin/javac -version
      javac 14.0.2

      A DESCRIPTION OF THE PROBLEM :
      Given a record class with a constant field,
      And that constant field has an annotation,
      When compiling that class,
      Then the compilation throws an exception.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Create a record class with a field:

      record RecordClass() {
          @SuppressWarnings("foo")
          private static final int FIELD = 42;
      }

      Compile that record class, for example, with javac --enable-preview -source 14 -target 14 RecordClass.java

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      The record is compiled successfully into a class file.
      ACTUAL -
      The compiler throws a NullPointerException with the following stack trace:
      $ javac --enable-preview -source 14 -target 14 *.java
      Note: RecordClass.java uses preview language features.
      Note: Recompile with -Xlint:preview for details.
      An exception has occurred in the compiler (14.0.2). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program, the following diagnostic, and the parameters passed to the Java compiler in your report. Thank you.
      java.lang.NullPointerException
              at jdk.compiler/com.sun.tools.javac.comp.Check.validateAnnotation(Check.java:2912)
              at jdk.compiler/com.sun.tools.javac.comp.Check.validateAnnotations(Check.java:2868)
              at jdk.compiler/com.sun.tools.javac.comp.Annotate.lambda$annotateLater$1(Annotate.java:279)
              at jdk.compiler/com.sun.tools.javac.comp.Annotate.flush(Annotate.java:200)
              at jdk.compiler/com.sun.tools.javac.comp.Annotate.unblockAnnotations(Annotate.java:144)
              at jdk.compiler/com.sun.tools.javac.comp.Annotate.enterDone(Annotate.java:157)
              at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.enterDone(JavaCompiler.java:1752)
              at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:1073)
              at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:936)
              at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:316)
              at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:176)
              at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:57)
              at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:43)
      printing javac parameters to: /home/christian.hujer/git/christianhujer/java-bug-record-field-annotation/javac.20200720_160831.args


      ---------- BEGIN SOURCE ----------
      record RecordClass() {
          @SuppressWarnings("foo")
          private static final int FIELD = 42;
      }

      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      No general workaround is known at this time. In specific situations, like using @SuppressWarnings, tool might offer tool-specific workarounds, for example, using a warning suppression comment instead of the @SuppressWarnings annotation.

      FREQUENCY : always


            vromero Vicente Arturo Romero Zaldivar
            webbuggrp Webbug Group
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              Created:
              Updated:
              Resolved: