javahibernatemaven

JAXB ClassNotFoundException even though the dependencies are available

I am using Hibernate in my Java application and I just can not seem to get rid of this ClassNotFoundException with JAXB. I have literally tried everything but I can not seem to get it fixed.

I am using Java 21.

Here is the error I get:

    Caused by: jakarta.xml.bind.JAXBException: Implementation of Jakarta XML Binding-API has not been found on module path or classpath.
    at jakarta.xml.bind.ContextFinder.newInstance(ContextFinder.java:252) ~[?:?]
    at jakarta.xml.bind.ContextFinder.newInstance(ContextFinder.java:240) ~[?:?]
    at jakarta.xml.bind.ContextFinder.find(ContextFinder.java:381) ~[?:?]
    at jakarta.xml.bind.JAXBContext.newInstance(JAXBContext.java:605) ~[?:?]
    at jakarta.xml.bind.JAXBContext.newInstance(JAXBContext.java:546) ~[?:?]
    at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:121) ~[?:?]
    ... 25 more
Caused by: java.lang.ClassNotFoundException: org.glassfish.jaxb.runtime.v2.ContextFactory
    at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445) ~[?:?]
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:593) ~[?:?]
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
    at jakarta.xml.bind.ServiceLoaderUtil.nullSafeLoadClass(ServiceLoaderUtil.java:113) ~[?:?]
    at jakarta.xml.bind.ServiceLoaderUtil.safeLoadClass(ServiceLoaderUtil.java:146) ~[?:?]
    at jakarta.xml.bind.ContextFinder.newInstance(ContextFinder.java:250) ~[?:?]
    at jakarta.xml.bind.ContextFinder.newInstance(ContextFinder.java:240) ~[?:?]
    at jakarta.xml.bind.ContextFinder.find(ContextFinder.java:381) ~[?:?]
    at jakarta.xml.bind.JAXBContext.newInstance(JAXBContext.java:605) ~[?:?]
    at jakarta.xml.bind.JAXBContext.newInstance(JAXBContext.java:546) ~[?:?]
    at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:121) ~[?:?]
    ... 25 more

And here is my full POM file:

    <groupId>org.test.project</groupId>
    <artifactId>project-core</artifactId>
    <version>1.0-SNAPSHOT</version>

    <name>project-core</name>
    <description>test project</description>

    <repositories>
        <repository>
            <id>spigot-repo</id>
            <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
        </repository>
        <repository>
            <id>minecraft-repo</id>
            <url>https://libraries.minecraft.net/</url>
        </repository>
    </repositories>

    <dependencies>
        <dependency>
            <groupId>org.spigotmc</groupId>
            <artifactId>spigot-api</artifactId>
            <version>1.21.4-R0.1-SNAPSHOT</version>
            <scope>provided</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.hibernate.orm/hibernate-core -->
        <dependency>
            <groupId>org.hibernate.orm</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>6.6.12.Final</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.mysql/mysql-connector-j -->
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <version>9.2.0</version>
        </dependency>
    </dependencies>

    <build>
        <defaultGoal>clean install</defaultGoal>
        <resources>
            <resource>
                <directory>${project.basedir}/src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
        <plugins>
            <!-- Maven Compiler Plugin -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>21</source>
                    <target>21</target>
                </configuration>
            </plugin>

            <!-- Maven Shade Plugin -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>3.2.4</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <transformers>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

Please note, I removed the JAXB dependencies in this POM file but I have already tried adding the JAXB API and runtime implementation and it remained to give me this error. Like I said before, I decompiled my JAR file and org.glassfish.jaxb.runtime.v2.ContextFactory is compiled fine as it is part of the Hibernate dependency.

These are the dependencies I tried adding before:

<dependency>
    <groupId>jakarta.xml.bind</groupId>
    <artifactId>jakarta.xml.bind-api</artifactId>
    <version>4.0.0</version> 
</dependency>
<!-- JAXB Reference Implementation -->
<dependency>
    <groupId>org.glassfish.jaxb</groupId>
    <artifactId>jaxb-runtime</artifactId>
    <version>4.0.0</version> 
    <scope>runtime</scope>
</dependency>

I also tried multiple versions of these dependencies. And tried the sun dependencies which also did not work.

I have tried to include classpaths in the MANIFEST.mf file - this did not fix the problem. And I tried using Eclipse's Moxy dependency instead of JAXB (and included jaxb.properties), this did not fix the problem either.

Furthermore, I tried to add the jaxb dependencies and excluded them from the Hibernate dependency to ensure they were not conflicting, this did not fix the problem either.

I tried running it on multiple Java versions and as you can guess that was not successful either.

I have tried every possible thing to get rid of the java.lang.ClassNotFoundException: org.glassfish.jaxb.runtime.v2.ContextFactory and get Hibernate to work, but I just can not seem to get it fixed. What more can I try? Help is very appreciated!

Solution

  • Try to add the correct JAXB Dependencies dependencies like this (no scope!):

    <dependency>
    <groupId>jakarta.xml.bind</groupId>
    <artifactId>jakarta.xml.bind-api</artifactId>
    <version>4.0.0</version>
</dependency>
<dependency>
    <groupId>org.glassfish.jaxb</groupId>
    <artifactId>jaxb-runtime</artifactId>
    <version>4.0.0</version>
</dependency>

    It is important that you add them to pom.xml exactly like this without <scope>runtime</scope> since you are using the Shade plugin to package everything.

    Edit:

    Ensure there are no conflicting JAXB APIs or outdated javax.xml.bind versions. You can do this with:

    mvn dependency:tree

    Solution:

    Spigot/Bukkit loads plugins with a separate classloader, while JAXB uses the context classloader. This might be the issue if nothing else helped. Put this in your plugins onEnable() before anything from Hibernate runs: Thread.currentThread().setContextClassLoader(MyPlugin.class.getClassLoader());