JDK9 and maven-jar-plugin

user_1339429 0
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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>
maven-jar-plugin java-9 maven java
2 Answers

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

user_17461180

I had the latest maven version 3.6.3. But I realized there is a mismatch in the java version set in my environment path config to the one installed in my IDE (IntelliJ).

I configured to the latest JDK version (for 1.8) in my IDE to 1.8.0_265 enter image description here

I set my environment path to the same version enter image description here

You can configure JAVA_HOME, JRE_HOME, JDK_HOME here. Also, make sure the path is added. enter image description here

Reference on how to set environment variables: https://stackoverflow.com/a/26640589/2889297

Maven homepage gives you a high-level idea on what should be the compatible java version https://maven.apache.org/install.html

Note: After updating the environment path and before running mvn clean install, make sure the version is correctly reflected in the IDE terminal. You will have to close and reopen your IDE for the changes to be reflected.

user_28892970
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