maven_sourcepath_bug.sh

#!/bin/sh
 
#
# I'd expect the following to fail, but it works because javac will implicitly load A.java
# from src/main/java passed as -sourcepath.
# That wouldn't happen if javac was called with a dummy -sourcepath; sourcepath is not needed
# as Maven already computes the exact list of source files to compute.
# Proof by example: uncomment the `compilerArgs` and run `mvn clean compile` again
#
 
mkdir -p src/main/java/foo/bar
echo '
<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/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>
  <groupId>test</groupId>
  <artifactId>test</artifactId>
  <version>1.0-SNAPSHOT</version>

  <build>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.2</version>
        <configuration>
          <excludes>
            <exclude>**/A.*</exclude>
          </excludes>
<!-- Uncomment to workaround bug: -->
<!--
          <compilerArgs>
            <arg>-sourcepath</arg>
            <arg>:</arg>
          </compilerArgs>
-->
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>
' > pom.xml
echo '
package foo.bar;

abstract class A {
}
' > src/main/java/foo/bar/A.java;
echo '
package foo.bar;

class B extends A {
}
' > src/main/java/foo/bar/B.java;

mvn compile