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I just upgraded my Java8 project with the brand new official release of Java9.
The project uses a Maven plugin, org.apache.maven.plugins:maven-jar-plugin version 2.6. When I run mvn clean install I now get the following exception:
ERROR] Failed to execute goal org.apache.maven.plugins:maven-jar-plugin:2.6:jar (default-jar) on project my-test-utils: Execution default-jar of goal org.apache.maven.plugins:maven-jar-plugin:2.6:jar failed: An API incompatibility was encountered while executing org.apache.maven.plugins:maven-jar-plugin:2.6:jar: java.lang.ExceptionInInitializerError: null
[ERROR] -----------------------------------------------------
[ERROR] realm = plugin>org.apache.maven.plugins:maven-jar-plugin:2.6
[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = file:/Users/jeanvaljean/.m2/repository/org/apache/maven/plugins/maven-jar-plugin/2.6/maven-jar-plugin-2.6.jar
[ERROR] urls[1] = file:/Users/jeanvaljean/.m2/repository/org/slf4j/slf4j-jdk14/1.5.6/slf4j-jdk14-1.5.6.jar
[ERROR] urls[2] = file:/Users/jeanvaljean/.m2/repository/org/slf4j/jcl-over-slf4j/1.5.6/jcl-over-slf4j-1.5.6.jar
[ERROR] urls[3] = file:/Users/jeanvaljean/.m2/repository/org/apache/maven/reporting/maven-reporting-api/2.2.1/maven-reporting-api-2.2.1.jar
[ERROR] urls[4] = file:/Users/jeanvaljean/.m2/repository/org/apache/maven/doxia/doxia-sink-api/1.1/doxia-sink-api-1.1.jar
[ERROR] urls[5] = file:/Users/jeanvaljean/.m2/repository/org/apache/maven/doxia/doxia-logging-api/1.1/doxia-logging-api-1.1.jar
[ERROR] urls[6] = file:/Users/jeanvaljean/.m2/repository/junit/junit/3.8.1/junit-3.8.1.jar
[ERROR] urls[7] = file:/Users/jeanvaljean/.m2/repository/commons-cli/commons-cli/1.2/commons-cli-1.2.jar
[ERROR] urls[8] = file:/Users/jeanvaljean/.m2/repository/org/codehaus/plexus/plexus-interactivity-api/1.0-alpha-4/plexus-interactivity-api-1.0-alpha-4.jar
[ERROR] urls[9] = file:/Users/jeanvaljean/.m2/repository/backport-util-concurrent/backport-util-concurrent/3.1/backport-util-concurrent-3.1.jar
[ERROR] urls[10] = file:/Users/jeanvaljean/.m2/repository/org/sonatype/plexus/plexus-sec-dispatcher/1.3/plexus-sec-dispatcher-1.3.jar
[ERROR] urls[11] = file:/Users/jeanvaljean/.m2/repository/org/sonatype/plexus/plexus-cipher/1.4/plexus-cipher-1.4.jar
[ERROR] urls[12] = file:/Users/jeanvaljean/.m2/repository/org/codehaus/plexus/plexus-interpolation/1.11/plexus-interpolation-1.11.jar
[ERROR] urls[13] = file:/Users/jeanvaljean/.m2/repository/org/apache/maven/maven-archiver/2.6/maven-archiver-2.6.jar
[ERROR] urls[14] = file:/Users/jeanvaljean/.m2/repository/org/apache/maven/shared/maven-shared-utils/0.7/maven-shared-utils-0.7.jar
[ERROR] urls[15] = file:/Users/jeanvaljean/.m2/repository/com/google/code/findbugs/jsr305/2.0.1/jsr305-2.0.1.jar
[ERROR] urls[16] = file:/Users/jeanvaljean/.m2/repository/org/codehaus/plexus/plexus-utils/3.0.20/plexus-utils-3.0.20.jar
[ERROR] urls[17] = file:/Users/jeanvaljean/.m2/repository/org/codehaus/plexus/plexus-archiver/2.9/plexus-archiver-2.9.jar
[ERROR] urls[18] = file:/Users/jeanvaljean/.m2/repository/org/codehaus/plexus/plexus-io/2.4/plexus-io-2.4.jar
[ERROR] urls[19] = file:/Users/jeanvaljean/.m2/repository/commons-io/commons-io/2.2/commons-io-2.2.jar
[ERROR] urls[20] = file:/Users/jeanvaljean/.m2/repository/org/apache/commons/commons-compress/1.9/commons-compress-1.9.jar
[ERROR] Number of foreign imports: 1
[ERROR] import: Entry[import from realm ClassRealm[maven.api, parent: null]]
[ERROR]
Any hint on how to solve this?
I'm using Maven 3.3.9. mvn -version outputs:
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T17:41:47+01:00)
Maven home: /Users/jeanvaljean/Applications/maven/apache-maven-3.3.9
Java version: 9, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home
Default locale: en_IT, platform encoding: UTF-8
OS name: "mac os x", version: "10.12.3", arch: "x86_64", family: "mac"
The module that is failing is actually the first child module of the parent pom. It is surprisingly empty:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
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>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.7.RELEASE</version>
</parent>
<groupId>my.group</groupId>
<artifactId>my-parent</artifactId>
<version>0.1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<modules>
<module>test-utils</module>
<module>commons</module>
<module>validation</module>
</modules>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>9</java.version>
<tomcat.version>8.5.5</tomcat.version>
<unit-tests.skip>true</unit-tests.skip>
<integration-tests.skip>true</integration-tests.skip>
<!-- PLUGINS -->
<maven-compiler-plugin>3.6.2</maven-compiler-plugin>
<maven-surefire-plugin>2.20.1</maven-surefire-plugin>
<nexus-staging-maven-plugin>1.6.8</nexus-staging-maven-plugin>
<maven-source-plugin>3.0.1</maven-source-plugin>
<maven-javadoc-plugin>3.0.0-M1</maven-javadoc-plugin>
<maven-gpg-plugin>1.6</maven-gpg-plugin>
<versions-maven-plugin>2.4</versions-maven-plugin>
<maven-scm-plugin>1.9.5</maven-scm-plugin>
</properties>
<prerequisites>
<maven>3.0.4</maven>
</prerequisites>
<dependencies>
<!-- SPRING BOOT -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-hystrix</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.retry</groupId>
<artifactId>spring-retry</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.2</version>
<configuration>
<source>9</source>
<target>9</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<excludes>
<exclude>**/*AcceptanceTest.java</exclude>
<exclude>**/*IT.java</exclude>
</excludes>
</configuration>
<executions>
<execution>
<id>integration-test</id>
<goals>
<goal>test</goal>
</goals>
<phase>integration-test</phase>
<configuration>
<excludes>
<exclude>none</exclude>
</excludes>
<includes>
<include>**/*IT.java</include>
</includes>
</configuration>
</execution>
<execution>
<id>acceptance-test</id>
<goals>
<goal>test</goal>
</goals>
<phase>verify</phase>
<configuration>
<excludes>
<exclude>none</exclude>
</excludes>
<includes>
<include>**/*AcceptanceTest.java</include>
</includes>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.5.201505241946</version>
<executions>
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>default-check</id>
<phase>prepare-package</phase>
<goals>
<goal>report</goal>
<goal>check</goal>
</goals>
<configuration>
<rules>
<rule>
<element>CLASS</element>
<excludes>
<!--<exclude>it.ozimov</exclude>-->
</excludes>
<limits>
<limit>
<counter>BRANCH</counter>
<value>COVEREDRATIO</value>
<minimum>0</minimum>
</limit>
<limit>
<counter>LINE</counter>
<value>COVEREDRATIO</value>
<minimum>0</minimum>
</limit>
</limits>
</rule>
</rules>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>versions-maven-plugin</artifactId>
<version>2.3</version>
<configuration>
<generateBackupPoms>false</generateBackupPoms>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4.1</version>
<dependencies>
<dependency>
<groupId>org.codehaus.plexus</groupId>
<artifactId>plexus-archiver</artifactId>
<version>2.4.4</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.6</version>
<dependencies>
<dependency>
<groupId>org.codehaus.plexus</groupId>
<artifactId>plexus-archiver</artifactId>
<version>2.4.4</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
</project>
389
The chances are mostly of an incompatible maven-plugin version in your module. You could try to update the plugin configuration in the parent module to the following and test:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
<configuration>
<source>1.9</source>
<target>1.9</target>
<jdkToolchain>
<version>9</version>
</jdkToolchain>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
</plugin>
</plugins>
</build>
For the list of compatible versions of all the plugins, do refer to Maven#Java9+Jigsaw
71
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