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https://issues.apache.org/jira/browse/MCOMPILER-348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16544570#comment-16544570
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Karl Heinz Marbaise commented on MCOMPILER-348:
-----------------------------------------------
If I try to compile the state (https://github.com/vandekeiser/wires.git) of the
branch {{MCOMPILER_ISSUE2}} (Commit: 10bfe27e260f5947e83f24c9c2f40c967a4837ea)
I get the following:
{noformat}
[INFO] --- maven-compiler-plugin:3.7.0:testCompile (default-testCompile) @
clientmod ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to
/Users/kama/ws-git-so/wires/clientmod/target/test-classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR]
/Users/kama/ws-git-so/wires/clientmod/src/test/java/qux/DerivedTest.java:[3,11]
package api does not exist
[ERROR]
/Users/kama/ws-git-so/wires/clientmod/src/test/java/qux/DerivedTest.java:[11,13]
cannot find symbol
symbol: class Base
location: class qux.DerivedTest
[INFO] 2 errors
[INFO] -------------------------------------------------------------
{noformat}
> Can't make test-scoped dependencies work with Java 9 modules
> ------------------------------------------------------------
>
> Key: MCOMPILER-348
> URL: https://issues.apache.org/jira/browse/MCOMPILER-348
> Project: Maven Compiler Plugin
> Issue Type: Bug
> Affects Versions: 3.7.0
> Environment: $ mvn -version
> Apache Maven 3.5.4 (1edded0938998edf8bf061f1ceb3cfdeccf443fe;
> 2018-06-17T20:33:14+02:00)
> Maven home: G:\software\apache-maven-3.5.4-bin\apache-maven-3.5.4
> Java version: 9.0.4, vendor: Oracle Corporation, runtime: C:\Program
> Files\Java\jdk-9.0.4
> Default locale: fr_FR, platform encoding: Cp1252
> OS name: "windows 7", version: "6.1", arch: "amd64", family: "windows"
> Reporter: foo bar
> Priority: Major
> Labels: Java9, jigsaw, scope, test
>
> h1. In short
> With Java 9 if I declare both the test-scoped dependency and the Java 9
> modules the test doesn't compile anymore (mvn clean install output):
> {code:java}
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-compiler-plugin:3.7.0:testCompile
> (default-testCompile) on project clientmod: Compilation failure
> [ERROR]
> /G:/projets/wires/wires/wires/clientmod/src/test/java/client/test/DerivedTest.java:[8,22]
> cannot access api.Base
> [ERROR] class file for api.Base not found
> {code}
>
> h1. Explanation of the 2 modules, and what fails
> I have a java 9 maven project with 2 modules: {{apimod}} and {{clientmod}}.
> Module {{clientmod}} depends on module {{apimod}} (those modules are both
> Maven modules and Java 9 modules).
> Also, i want module {{clientmod}} to be able to reuse not only production
> code from {{apimod}}, *but also test code*. This is a common pattern, that I
> used many times with Java 8. With Java 9 (it's the same with Java 10) it also
> works fine, as long as i don't declare module-info.java (that is, as long as
> I don't run with the module system).
> But as soon as I do, enabling the test dependency seems to disable the
> production dependency: {{api.Base}} (an {{src/main}} class of module
> {{apimod}}) is no longer visible from {{qux.DerivedTest}} (an {{src/test}}
> class of module {{clientmod}}). The test doesn't compile anymore. (_Note that
> every class is in a different package to eliminate split packages as a cause
> of the problem_)
> This is with: Java 9.0.4 (it's the same with Java 10), Maven 3.5.3,
> maven-compiler-plugin 3.7.0
>
> h1. A project to reproduce the issue
> h2. The code
> I "dichotomized" the issue with a failing test in a branch:
> {code:java}
> git clone https://github.com/vandekeiser/wires.git
> git checkout MCOMPILER_ISSUE2
> mvn clean install{code}
> -> BUILD FAIL (compilation error in the test of {{clientmod}})
> h2. The Maven test-scoped dependency
> I want module {{clientmod}} to be able to reuse not only production code from
> {{apimod}} but also test code. With Maven you do it like that
> ({{clientmod/pom.xml}}):
> {code:java}
> <dependency>
> <groupId>fr.cla</groupId>
> <artifactId>apimod</artifactId>
> <version>${project.version}</version>
> <classifier>tests</classifier>
> <scope>test</scope>
> </dependency>
> {code}
> h2. The Java 9 modules
> {code:java}
> module apimod {
> exports api;
> }
> module clientmod {
> requires apimod;
> }
> {code}
> h2. The failure when trying to enable both module systems
> With Java 9 if I declare both the test-scoped dependency and the Java 9
> modules the test doesn't compile anymore ({{mvn clean install}} output):
> {code:java}
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-compiler-plugin:3.7.0:testCompile
> (default-testCompile) on project clientmod: Compilation failure
> [ERROR]
> /G:/projets/wires/wires/wires/clientmod/src/test/java/client/test/DerivedTest.java:[8,22]
> cannot access api.Base
> [ERROR] class file for api.Base not found
> {code}
> h1. My analysis so far
> h2. It works if i remove the test-scope dependency
> If i comment the test-dependency, {{mvn clean install}} passes:
> {code:java}
> DerivedTest /*extends BaseTest*/
> {code}
> {code:java}
> <!--Comment the following to make mvn clean install pass (but then you can't
> have DerivedTest extends BaseTest)-–>
> <!--<dependency>-->
> <!--<groupId>fr.cla</groupId>-->
> <!--<artifactId>apimod</artifactId>-->
> <!--<version>${project.version}</version>-->
> <!--<classifier>tests</classifier>-->
> <!--<scope>test</scope>-->
> <!--</dependency>-->
> {code}
>
> h2. Trying to pass explicit module flags to the JVM
> After asking here:
> [https://stackoverflow.com/questions/50122838/cant-make-maven-test-scoped-dependencies-work-with-java-9-nor-10-modules]
> I tried the following flags to move {{apimod-1.0-SNAPSHOT-tests.jar}} from
> {{--module-path}} to {{--patch-module clientmod}}, it compiles but then
> surefire fails so it must not be right either (anyway passing all those flags
> is fragile):
> {code:java}
> <!--This makes the test compile even with the test-scoped dependency
> present, but then surefire fails (so probably those flags are incorrect
> too)-->
> <compilerArgs>
> <arg>--module-source-path=./*/src/main/java;./*/src/test/java/;</arg>
> <arg>
>
> --source-path=/G/projets/wires/wires/wires/apimod/src/main/java;/G/projets/wires/wires/wires/apimod/src/test/java;/G/projets/wires/wires/wires/clientmod/src/test/java;/G/projets/wires/wires/wires/clientmod/src/main/java;
> </arg>
> <arg>-Xlint:all</arg>
> <arg>
>
> --patch-module=clientmod=/G/projets/wires/wires/wires/clientmod/target/classes;/G/projets/wires/wires/wires/clientmod/src/test/java;/G/projets/wires/wires/wires/apimod/target/apimod-1.0-SNAPSHOT.jar;/G/projets/wires/wires/wires/apimod/target/apimod-1.0-SNAPSHOT-tests.jar;
> </arg>
> <arg>--add-reads=apimod=ALL-UNNAMED</arg>
> <arg>--add-reads=clientmod=ALL-UNNAMED</arg>
> <arg>--add-exports=apimod/api=ALL-UNNAMED</arg>
> <arg>--add-exports=clientmod/client=ALL-UNNAMED</arg>
> <arg>--add-modules=apimod</arg>
> </compilerArgs>
> {code}
> Just mentioning this in case the problem would be wrong javac flags.
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