Maven 无法使用 OpenJDK 11 找到 jaxb-api，即使它存在于存储库中

Question

I have a machine having Windows OS, it is used to build few WAR Projects. It has Java 8 installed on it. I am using Maven 3.2.5 to build these WAR Projects. Everything is working fine. But as Java 8 will be a problem in future due to its end of free updates I thought of upgrading to OpenJDK 11.

I downloaded OpenJDK 11 but did not install it as I just wanted to try this for 1 of the project to start. I picked up one of the WAR Project to check if OpenJDK 11 works. This project is created using JHipster and Spring Boot. I changed the pom.xml for this project to use spring-boot.version to 2.1.2 and java.verion to 11 and also put the jaxb-api, jaxb-impl, jaxb-runtime and javax.activation enteries(as shown below) to avoid jaxb related dependency errors in Java 11.

In windows command prompt, I set the JAVA_HOME and PATH variables to OpenJDK11 and then I fire the mvn clean compile package command. As expected all jaxb related dependencies are downloaded in the maven repository but still maven is throwing error NoClassDefFoundError: javax/xml/bind/JAXBException while jaxb-api jar is still there in Maven repository. I tried to fire the command again but no luck.

Can anyone please guide me about the possible root cause or any workaround.

        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>2.3.0</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-impl</artifactId>
            <version>2.3.0</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jaxb</groupId>
            <artifactId>jaxb-runtime</artifactId>
            <version>2.3.0</version>
        </dependency>
        <dependency>
            <groupId>javax.activation</groupId>
            <artifactId>activation</artifactId>
            <version>1.1.1</version>
        </dependency>

Answer 1

原因可能是java9之后的modules，所以你应该创建一个module-info.java文件，更多细节参考相关文档。

Answer 2

Apparently only jars upgrade of various components are needed to support JDK11 in Java projects written using Java8. Module support is not needed until you want to create modular projects in the product and Import/Export of module is needed.

I have upgraded the Javaassist Jar as well along with the ones mentioned in question and everything started working fine after it.

<javassist.version>3.24.1-GA</javassist.version>

and as mentioned in question itself

        <dependency>
            <groupId>org.glassfish.jaxb</groupId>
            <artifactId>jaxb-runtime</artifactId>
            <version>2.3.2</version>
        </dependency>
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>2.3.1</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-core</artifactId>
            <version>2.2.11</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-impl</artifactId>
            <version>2.2.11</version>
        </dependency>
        <dependency>
            <groupId>javax.activation</groupId>
            <artifactId>javax.activation-api</artifactId>
            <version>1.2.0</version>
        </dependency>

Answer 3

I have the same problem, I use spring-boot and java 11. This help me.

<dependency>
    <groupId>org.glassfish.jaxb</groupId>
    <artifactId>jaxb-runtime</artifactId>
</dependency>

Answer 4

I got this working with the following POM

<properties>
    <maven-jaxb2-plugin.version>0.14.0</maven-jaxb2-plugin.version>
</properties>

//

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>4.0.1</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
        <version>2.4.0-b180830.0359</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.activation/activation -->
    <dependency>
        <groupId>javax.activation</groupId>
        <artifactId>activation</artifactId>
        <version>1.1</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.glassfish.jaxb/jaxb-runtime -->
    <dependency>
        <groupId>org.glassfish.jaxb</groupId>
        <artifactId>jaxb-runtime</artifactId>
        <version>2.3.0-b170127.1453</version>
    </dependency>
</dependencies>

//

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>

        <plugin>
            <groupId>org.jvnet.jaxb2.maven2</groupId>
            <artifactId>maven-jaxb2-plugin</artifactId>
            <version>${maven-jaxb2-plugin.version}</version>
            <executions>
                <execution>
                    <goals>
                        <goal>generate</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <schemaDirectory>${project.basedir}/src/main/resources/wsdl</schemaDirectory>
                <schemaIncludes>
                    <include>*.wsdl</include>
                </schemaIncludes>
            </configuration>
        </plugin>
    </plugins>
</build>

Answer 5

Add the code below into the start-class(such as SpringBootApplication):

@Bean
public TomcatServletWebServerFactory tomcatFactory() {
    return new TomcatServletWebServerFactory() {
        @Override
        protected void postProcessContext(Context context) {
            ((StandardJarScanner) context.getJarScanner()).setScanManifest(false);
        }
    };
}