Java 9 build 118 is hiding some documented & public classes from unnamed module

[Uwe Schindler]

Hi,

the Lucene team installed JDK9 build 118 today and this failed our build during some checks. The reason is that some classes are missing from the unnamed module (standard Java 8 classpath-only application). Just try this test:

public class Test {
  public static void main(String... args) throws Exception {
    Class.forName("javax.xml.bind.DatatypeConverter"); 
  }
}

$ javac Test.java
$ java Test
Exception in thread "main" java.lang.ClassNotFoundException: javax.xml.bind.DatatypeConverter
        at jdk.internal.loader.BuiltinClassLoader.loadClass(java.base at 9-ea/BuiltinClassLoader.java:366)
        at jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(java.base at 9-ea/ClassLoaders.java:184)
        at java.lang.ClassLoader.loadClass(java.base at 9-ea/ClassLoader.java:419)
        at java.lang.Class.forName0(java.base at 9-ea/Native Method)
        at java.lang.Class.forName(java.base at 9-ea/Class.java:294)
        at Test.main(Test.java:3)

$ java -version
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+118)
Java HotSpot(TM) 64-Bit Server VM (build 9-ea+118, mixed mode)

This works with build 116 and Java 8.

This is not the only class that’s missing at runtime, there are more: I do not have the complete list, but our checks using the forbiddenapis Ant/Maven/Gradle plugin fails to load classes around JAXB/XML (javax.xml.bind.*, javax.jws.*) and CORBA (org.omg.CORBA.*), but also "javax.activation.ActivationDataFlavor". But there may be more packages missing.

It looks like some module exports are missing because the classes are all listed on the JDK docs: http://download.java.net/java/jdk9/118/docs/api/index.html
I'd suggest to add a check in the packaging that validates that all classes also visible in the Javadocs are visible at runtime from applications not using the module system.

Should I open bug report or can we shortcut this through the mailing list?

Greetings from the Lucene team,
Uwe

-----
Uwe Schindler
uschindler at apache.org 
ASF Member, Apache Lucene PMC / Committer
Bremen, Germany
http://lucene.apache.org/