Import of a Java-9-Jigsaw-Maven-Project in Eclipse Oxygen 4.7 does not work
I use:
- JDK 9 build 9-ea+172
- Maven 3.5.0
- Eclipse Oxygen 4.7 RC3 Version 4.7.0.I20170531-2000 from 2017-05-31
- Eclipse-Plugins:
- Eclipse JDT (Java Development Tools) Patch with Java 9 support (BETA) for Oxygen development stream, 1.1.1.v20170526-0728_BETA_JAVA9
- m2e - Maven Integration for Eclipse (includes Incubating components), 1.8.0.20170516-2043
Creata a new Jigsaw-Maven-Project:
mkdir proj1\a\src\main\java\a\a
cd proj1
In directory proj1 the file pom.xml:
<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>
<groupId>test</groupId>
<artifactId>Proj1</artifactId>
<version>1.0</version>
<packaging>pom</packaging>
<modules>
<module>a</module>
</modules>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<source>9</source>
<target>9</target>
<showWarnings>true</showWarnings>
<showDeprecation>true</showDeprecation>
</configuration>
</plugin>
</plugins>
</build>
</project>
In directory proj1\a the file pom.xml:
<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>
<parent>
<groupId>test</groupId>
<artifactId>Proj1</artifactId>
<version>1.0</version>
</parent>
<artifactId>a</artifactId>
<packaging>jar</packaging>
<build>
<sourceDirectory>src/main/java/a</sourceDirectory>
</build>
</project>
In directory proj1\a\src\main\java\a the file module-info.java:
module a { }
In directory proj1\a\src\main\java\a\a the file App.java:
package a;
public class App {
public static void main( String[] args ) {
System.out.println( "CLASSPATH: " + System.getProperty( "java.class.path" ) );
System.out.println( "Class / Modul: " + App.class.getSimpleName() + " from " + App.class.getModule() );
java.lang.ModuleLayer lr = App.class.getModule().getLayer();
if( lr != null ) {
System.out.println( "Layer.Configuration: " + lr.configuration() );
} else {
System.out.println( "Error: ModuleLayer is null" );
}
}
}
Running the project on command line:
cd proj1
mvn clean package
java -p a\target\a-1.0.jar -m a/a.App
-->
CLASSPATH:
Class / Modul: App from module a
Layer.Configuration: java..., ...
-->
Works perfect without error (CLASSPATH is empty, name from getModule() is correct, and ModuleLayer is valid).
Opening the project in IntelliJ IDEA 2017.2 EAP
-->
Works perfect without error (CLASSPATH is empty, name from getModule() is correct, and ModuleLayer is valid).
Importing the project in Eclipse Oxygen 4.7 RC3:
-->
CLASSPATH: ...\proj1\a\target\classes
Class / Modul: App from unnamed module @68f7aae2
Error: ModuleLayer is null
-->
All three lines are wrong.
How can I avoid this errors?
