The JAXB APIs are considered to be Java EE APIs and therefore are no longer contained on the default classpath in Java SE 9. In Java 11, they are completely removed from the JDK.
Java 9 introduces the concepts of modules, and by default, the
java.se aggregate module is available on the classpath (or rather, module-path). As the name implies, the
java.se aggregate module does not include the Java EE APIs that have been traditionally bundled with Java 6/7/8.
Fortunately, these Java EE APIs that were provided in JDK 6/7/8 are still in the JDK, but they just aren't on the classpath by default. The extra Java EE APIs are provided in the following modules:
java.xml.bind << This one contains the JAXB APIs
Quick and dirty solution: (JDK 9/10 only)
To make the JAXB APIs available at runtime, specify the following command-line option:
But I still need this to work with Java 8!!!
If you try specifying
--add-modules with an older JDK, it will blow up because it's an unrecognized option. I suggest one of two options:
- You can set any Java 9+ only options using the
JDK_JAVA_OPTIONS environment variable. This environment variable is automatically read by the
java launcher for Java 9+.
- You can add the
-XX:+IgnoreUnrecognizedVMOptions to make the JVM silently ignore unrecognized options, instead of blowing up. But beware! Any other command-line arguments you use will no longer be validated for you by the JVM. This option works with Oracle/OpenJDK as well as IBM JDK (as of JDK 8sr4).
Alternate quick solution: (JDK 9/10 only)
Note that you can make all of the above Java EE modules available at run time by specifying the
--add-modules java.se.ee option. The
java.se.ee module is an aggregate module that includes
java.se.ee as well as the above Java EE API modules. Note, this doesn't work on Java 11 because
java.se.ee was removed in Java 11.
Proper long-term solution: (JDK 9 and beyond)
The Java EE API modules listed above are all marked
@Deprecated(forRemoval=true) because they are scheduled for removal in Java 11. So the
--add-module approach will no longer work in Java 11 out-of-the-box.
What you will need to do in Java 11 and forward is include your own copy of the Java EE APIs on the classpath or module path. For example, you can add the JAX-B APIs as a Maven dependency like this:
See the JAXB Reference Implementation page for more details on JAXB.
For full details on Java modularity, see JEP 261: Module System
For Gradle or Android Studio developer: (JDK 9 and beyond)
Add the following dependencies to your
// JAX-B dependencies for JDK 9+