But it doesn’t appear to be working for me.
> [INFO] --- maven-compiler-plugin:3.8.0:compile (java9) @ pfl-basic ---
> [DEBUG] Configuring mojo
> org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile from plugin
> realm ClassRealm[plugin>org.apache.maven.plugins:maven-compiler-plugin:3.8.0,
> parent: jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29]
> [DEBUG] Configuring mojo
> 'org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile' with basic
> configurator -->
> [DEBUG] (f) basedir =
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic
> [DEBUG] (f) buildDirectory =
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target
> [DEBUG] (f) compilePath =
> [/Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/classes]
> [DEBUG] (f) compileSourceRoots =
> [/Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java9]
> [DEBUG] (f) compilerId = javac
> [DEBUG] (f) debug = true
> [DEBUG] (f) encoding = UTF-8
> [DEBUG] (f) failOnError = true
> [DEBUG] (f) failOnWarning = false
> [DEBUG] (f) forceJavacCompilerUse = false
> [DEBUG] (f) fork = false
> [DEBUG] (f) generatedSourcesDirectory =
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/generated-sources/annotations
> [DEBUG] (f) jdkToolchain = {version=9}
> [DEBUG] (f) mojoExecution =
> org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile {execution:
> java9}
> [DEBUG] (f) multiReleaseOutput = true
> [DEBUG] (f) optimize = false
> [DEBUG] (f) outputDirectory =
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/classes
> [DEBUG] (f) parameters = false
> [DEBUG] (f) project = MavenProject:
> org.glassfish.pfl:pfl-basic:4.0.1-SNAPSHOT @
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/pom.xml
> [DEBUG] (f) projectArtifact = org.glassfish.pfl:pfl-basic:jar:4.0.1-SNAPSHOT
> [DEBUG] (s) release = 9
> [DEBUG] (f) session = org.apache.maven.execution.MavenSession@7640a5b1
> [DEBUG] (f) showDeprecation = false
> [DEBUG] (f) showWarnings = false
> [DEBUG] (f) skipMultiThreadWarning = false
> [DEBUG] (f) source = 1.7
> [DEBUG] (f) staleMillis = 0
> [DEBUG] (s) target = 1.7
> [DEBUG] (f) useIncrementalCompilation = true
> [DEBUG] (f) verbose = false
> [DEBUG] -- end configuration --
> [DEBUG] Using compiler 'javac'.
> [DEBUG] Toolchain
> JDK[/Library/Java/JavaVirtualMachines/1.6.0_41-b02-445.jdk/Contents/Home]
> doesn't match required property: version
> [DEBUG] Toolchain
> JDK[/Library/Java/JavaVirtualMachines/jdk1.7.0_65.jdk/Contents/Home] doesn't
> match required property: version
> [DEBUG] Toolchain
> JDK[/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home] doesn't
> match required property: version
> [DEBUG] Toolchain
> JDK[/Library/Java/JavaVirtualMachines/jdk-11.0.2.jdk/Contents/Home] doesn't
> match required property: version
> [INFO] Toolchain in maven-compiler-plugin:
> JDK[/Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home]
> [DEBUG] Adding
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/generated-sources/annotations
> to compile source roots:
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java
>
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/generated-sources/annotations
> [DEBUG] New compile source roots:
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java
>
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/generated-sources/annotations
> [DEBUG] CompilerReuseStrategy: reuseCreated
> [DEBUG] useIncrementalCompilation enabled
> [DEBUG] Stale source detected:
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java9/org/glassfish/pfl/basic/reflection/Bridge.java
> [DEBUG] Stale source detected:
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java9/org/glassfish/pfl/basic/reflection/BridgeBase9.java
> [INFO] Changes detected - recompiling the module!
> [DEBUG] Classpath:
> [DEBUG]
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/classes
> [DEBUG] Source roots:
> [DEBUG]
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java9
> [DEBUG] Excutable:
> [DEBUG] /Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home/bin/javac
> [DEBUG] Command line options:
> [DEBUG] -d
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/classes/META-INF/versions/9
> -classpath
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/classes:
> -sourcepath
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java9:/Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/generated-sources/annotations:
>
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java9/org/glassfish/pfl/basic/reflection/Bridge.java
>
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java9/org/glassfish/pfl/basic/reflection/BridgeBase9.java
> -s
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/generated-sources/annotations
> -g -nowarn --release 9 -encoding UTF-8
> [DEBUG] incrementalBuildHelper#beforeRebuildExecution
> [INFO] Compiling 2 source files to
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/classes/META-INF/versions/9
> [DEBUG] incrementalBuildHelper#afterRebuildExecution
> [WARNING]
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java9/org/glassfish/pfl/basic/reflection/BridgeBase9.java:[23,18]
> ReflectionFactory is internal proprietary API and may be removed in a future
> release
> [WARNING]
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java9/org/glassfish/pfl/basic/reflection/BridgeBase9.java:[26,18]
> ReflectionFactory is internal proprietary API and may be removed in a future
> release
> [WARNING]
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java9/org/glassfish/pfl/basic/reflection/BridgeBase9.java:[30,28]
> ReflectionFactory is internal proprietary API and may be removed in a future
> release
> [INFO]
> [INFO] --- maven-compiler-plugin:3.8.0:compile (java11) @ pfl-basic ---
> [DEBUG] Configuring mojo
> org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile from plugin
> realm ClassRealm[plugin>org.apache.maven.plugins:maven-compiler-plugin:3.8.0,
> parent: jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29]
> [DEBUG] Configuring mojo
> 'org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile' with basic
> configurator -->
> [DEBUG] (f) basedir =
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic
> [DEBUG] (f) buildDirectory =
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target
> [DEBUG] (f) compilePath =
> [/Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/classes]
> [DEBUG] (f) compileSourceRoots =
> [/Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java11]
> [DEBUG] (f) compilerId = javac
> [DEBUG] (f) debug = true
> [DEBUG] (f) encoding = UTF-8
> [DEBUG] (f) failOnError = true
> [DEBUG] (f) failOnWarning = false
> [DEBUG] (f) forceJavacCompilerUse = false
> [DEBUG] (f) fork = false
> [DEBUG] (f) generatedSourcesDirectory =
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/generated-sources/annotations
> [DEBUG] (f) jdkToolchain = {version=11}
> [DEBUG] (f) mojoExecution =
> org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile {execution:
> java11}
> [DEBUG] (f) multiReleaseOutput = true
> [DEBUG] (f) optimize = false
> [DEBUG] (f) outputDirectory =
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/classes
> [DEBUG] (f) parameters = false
> [DEBUG] (f) project = MavenProject:
> org.glassfish.pfl:pfl-basic:4.0.1-SNAPSHOT @
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/pom.xml
> [DEBUG] (f) projectArtifact = org.glassfish.pfl:pfl-basic:jar:4.0.1-SNAPSHOT
> [DEBUG] (s) release = 11
> [DEBUG] (f) session = org.apache.maven.execution.MavenSession@7640a5b1
> [DEBUG] (f) showDeprecation = false
> [DEBUG] (f) showWarnings = false
> [DEBUG] (f) skipMultiThreadWarning = false
> [DEBUG] (f) source = 1.7
> [DEBUG] (f) staleMillis = 0
> [DEBUG] (s) target = 1.7
> [DEBUG] (f) useIncrementalCompilation = true
> [DEBUG] (f) verbose = false
> [DEBUG] -- end configuration --
> [DEBUG] Using compiler 'javac'.
> [DEBUG] Toolchain
> JDK[/Library/Java/JavaVirtualMachines/1.6.0_41-b02-445.jdk/Contents/Home]
> doesn't match required property: version
> [DEBUG] Toolchain
> JDK[/Library/Java/JavaVirtualMachines/jdk1.7.0_65.jdk/Contents/Home] doesn't
> match required property: version
> [DEBUG] Toolchain
> JDK[/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home] doesn't
> match required property: version
> [DEBUG] Toolchain
> JDK[/Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home] doesn't match
> required property: version
> [INFO] Toolchain in maven-compiler-plugin:
> JDK[/Library/Java/JavaVirtualMachines/jdk-11.0.2.jdk/Contents/Home]
> [DEBUG] Adding
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/generated-sources/annotations
> to compile source roots:
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java
>
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/generated-sources/annotations
> [DEBUG] New compile source roots:
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java
>
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/generated-sources/annotations
> [DEBUG] CompilerReuseStrategy: reuseCreated
> [DEBUG] useIncrementalCompilation enabled
> [DEBUG] Stale source detected:
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java11/org/glassfish/pfl/basic/reflection/Bridge.java
> [INFO] Changes detected - recompiling the module!
> [DEBUG] Classpath:
> [DEBUG]
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/classes
> [DEBUG] Source roots:
> [DEBUG]
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java11
> [DEBUG] Excutable:
> [DEBUG]
> /Library/Java/JavaVirtualMachines/jdk-11.0.2.jdk/Contents/Home/bin/javac
Note that the release 9 classes were not added to the classpath, here. Just the
main output directory.
> [DEBUG] Command line options:
> [DEBUG] -d
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/classes/META-INF/versions/11
> -classpath
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/classes:
> -sourcepath
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java11:/Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/generated-sources/annotations:
>
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java11/org/glassfish/pfl/basic/reflection/Bridge.java
> -s
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/generated-sources/annotations
> -g -nowarn --release 11 -encoding UTF-8
> [DEBUG] incrementalBuildHelper#beforeRebuildExecution
> [INFO] Compiling 1 source file to
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/target/classes/META-INF/versions/11
> [DEBUG] incrementalBuildHelper#afterRebuildExecution
> [INFO] -------------------------------------------------------------
> [ERROR] COMPILATION ERROR :
> [INFO] -------------------------------------------------------------
> [ERROR]
> /Users/rgold/projects/eclipse-ee4j/orb-gmbal-pfl/pfl-basic/src/main/java11/org/glassfish/pfl/basic/reflection/Bridge.java:[51,34]
> error: cannot find symbol
> symbol: class BridgeBase9
> [INFO] 1 error
> On Feb 12, 2019, at 1:08 PM, Robert Scholte <rfscho...@apache.org> wrote:
>
> Hi Russ,
>
> There's no way to configure this, the plugin will do it for you[1]
>
> thanks,
> Robert
>
> [1]
> https://github.com/apache/maven-compiler-plugin/blob/master/src/main/java/org/apache/maven/plugin/compiler/CompilerMojo.java#L328-L346
>
> On Tue, 12 Feb 2019 18:56:52 +0100, Russell Gold <russell.g...@oracle.com>
> wrote:
>
>> Version 3.8.0 of the maven-compiler-plugin supports a multiReleaseOutput
>> option which can compile classes directly to the appropriate
>> META-INF/versions/{release} directory, which is very nice. What I don’t see,
>> though, is how to tell it to use the previous release as its dependency.
>> That is, given:
>>
>> src
>> |—— main
>> |—— java
>> |—— java9
>> \—— java11
>>
>> These directories will be compiled to:
>>
>> target/classes, target/classes/META-INF/9 and target/classes/META-INF/11.
>> But when I compile that last directory, I want to include
>> target/classes/META-INF/9 in my class path, and I don’t see an obvious way
>> to do it. It would be great if the plugin realized that this was necessary,
>> but is there a way to configure it?
>>
>> Thanks,
>> Russ
>
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