I've found a lot of information about how to coax Maven to compile Java-9 source code, but I haven't run into compiler issues. Instead, I have trouble running under Java-9. Running mvn clean install will compile my code fine, but the build still fails with an exception when it runs unit tests. I can't figure out how to run either the unit tests or the application, under Java 9. I suspect that the --add-modules java.xml.bind is getting added to the compiler options but not the runtime options.
I have a simple Spring-Boot 2.0.1 project with one small java source file, one empty java test source, and a pom.xml file. Here's the exception:
java.lang.IllegalStateException: Failed to load ApplicationContext
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException
Caused by: java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.JAXBException
I already know that I can add a jaxb-api dependency to fix this, but that doesn't solve the more general problem of using Maven with Java 9 modules.
Version Info
When I type mvn -v, this is what I get:
Apache Maven 3.5.2 (138edd61fd100ec658bfa2d307c43b76940a5d7d; 2017-10-18T00:58:13-07:00)
Maven home: /custom/apache-maven-3.5.2
Java version: 9.0.1, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk-9.0.1.jdk/Contents/Home
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.11.6", arch: "x86_64", family: "mac"
(I've read that I need at least maven version 3.5, so this is supposed to work.)
What doesn't work
Here's what I've already tried, that doesn't work:
Neither of these works:
export MAVEN_OPTS="--add-modules java.xml.bind"
export MAVEN_OPTS="--add-modules=java.xml.bind"
Adding a .mvn/jvm.config file with --add-modules java.xml.bind didn't work.
I didn't expect it to help to add the maven compiler plug-in to the pom.xml file, because compiling the code isn't an issue. I tried it anyway, but it didn't help. This is what I added to the project/build/plugins portion of the pom.xml file:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<compilerArgs>
<arg>--add-modules=java.xml.bind</arg>
</compilerArgs>
<source>1.9</source>
<target>1.9</target>
<fork>true</fork>
</configuration>
<version>3.7.0</version>
</plugin>
Building under Java 10 didn't help at all.
Source Code
I have an empty application.properties file.
My source file looks like this:
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class AngularSpringBootApplication {
public static void main(String[] args) {
SpringApplication.run(AngularSpringBootApplication.class, args);
}
}
My test file looks like this, in the same package on the test tree:
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
public class AngularSpringBootApplicationTests {
@Test
public void contextLoads() {
}
}
Here's my pom.xml file, which comes from the Spring Boot generator at http://start.spring.io/ (Some of this isn't necessary. This is a stripped-down version of a slightly larger project.)
<?xml version="1.0" encoding="UTF-8"?>
<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>com.neptunedreams.tutorial</groupId>
<artifactId>SpringBootBuildBug</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>SpringBootBuildBug</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>9</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--This is the solution to the Jax bug at execution time, but I don't like it. -->
<!--<dependency>-->
<!--<groupId>javax.xml.bind</groupId>-->
<!--<artifactId>jaxb-api</artifactId>-->
<!--<version>2.3.0</version>-->
<!--</dependency>-->
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<compilerArgs>
<arg>--add-modules=java.xml.bind</arg>
</compilerArgs>
<source>1.9</source>
<target>1.9</target>
<fork>true</fork>
</configuration>
<version>3.7.0</version>
</plugin>
</plugins>
</build>
</project>
