Packages com.google.errorprone.annotations and javax.annotation are not visible when built with Guava as dependency with jigsaw

I can’t build my project that uses Guava without getting these errors:

[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /D:/Development/tmp/target/generated-sources/annotations/com/example/ImmutableExample.java:[5,29] package com.google.errorprone.annotations is not visible
  (package com.google.errorprone.annotations is declared in the unnamed module, but module tmp does not read it)
[ERROR] /D:/Development/tmp/target/generated-sources/annotations/com/example/ImmutableExample.java:[6,29] package com.google.errorprone.annotations is not visible
  (package com.google.errorprone.annotations is declared in the unnamed module, but module tmp does not read it)
[ERROR] /D:/Development/tmp/target/generated-sources/annotations/com/example/ImmutableExample.java:[10,13] package javax.annotation is not visible
  (package javax.annotation is declared in the unnamed module, but module tmp does not read it)
[ERROR] /D:/Development/tmp/target/generated-sources/annotations/com/example/ImmutableExample.java:[11,13] package javax.annotation is not visible
  (package javax.annotation is declared in the unnamed module, but module tmp does not read it)
[ERROR] /D:/Development/tmp/target/generated-sources/annotations/com/example/ImmutableExample.java:[12,13] package javax.annotation is not visible
  (package javax.annotation is declared in the unnamed module, but module tmp does not read it)
[ERROR] /D:/Development/tmp/target/generated-sources/annotations/com/example/ImmutableExample.java:[13,24] package javax.annotation.concurrent is not visible
  (package javax.annotation.concurrent is declared in the unnamed module, but module tmp does not read it)
[ERROR] /D:/Development/tmp/target/generated-sources/annotations/com/example/ImmutableExample.java:[14,24] package javax.annotation.concurrent is not visible
  (package javax.annotation.concurrent is declared in the unnamed module, but module tmp does not read it)
[INFO] 7 errors 
[INFO] -------------------------------------------------------------

Here’s my MCVE project crafted specially to show the issue at hand:

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  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>

  <artifactId>tmp</artifactId>
  <groupId>com.example</groupId>
  <version>1.0.0-SNAPSHOT</version>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.1</version>
        <configuration>
          <release>11</release>
          <annotationProcessorPaths>
            <annotationProcessorPath>
              <groupId>org.immutables</groupId>
              <artifactId>value</artifactId>
              <version>2.8.8</version>
            </annotationProcessorPath>
          </annotationProcessorPaths>
        </configuration>
      </plugin>
    </plugins>
  </build>

  <dependencies>
    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
      <version>29.0-jre</version>
    </dependency>
    <dependency>
      <groupId>org.immutables</groupId>
      <artifactId>value</artifactId>
      <version>2.8.8</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>

</project>

src/main/java/module-info.java

module tmp {
	requires org.immutables.value;
}

src/main/java/com/example/Example.java

package com.example;

import org.immutables.value.Value;
import org.immutables.value.Value.Style.ImplementationVisibility;

@Value.Immutable
@Value.Style(visibility = ImplementationVisibility.PACKAGE)
public abstract class Example {
}

The obvious workaround is to change the module-info.java to add the following:

	requires com.google.errorprone.annotations;
	requires jsr305;

But that’s absolutely not a fix.

Simply having guava as a dependency makes this issue happen if I use modules. Removing the Guava dependency makes the issue disappear.

Please fix this by checking whether those modules are already required (in the module-info.java) at compile time. If they are not: don’t write those annotations so they are not compiled.

[elucash]

BTW when using separate annotation processing path, why not use only annotations module on the regular compilation path?

<!-- regular dependency, not the one in build/plugins -->
<dependency>
  <groupId>org.immutables</groupId>
  <artifactId>value-annotations</artifactId>
  <version>2.8.8</version>
  <scope>provided</scope>
</dependency>

requires org.immutables.value.annotations;

[elucash]

definitely, requires static is even better