JDK-8036030 added new classes in com.sun.xml.internal.org.jvnet.staxex and com.sun.xml.internal.org.jvnet.staxex.util that introduces a circular dependency between SAAJ and JAXB.

These classes depend on javax.xml.soap and it looks like they are only used by SAAJ:
> com/sun/xml/internal/org/jvnet/staxex/BinaryText.class
> com/sun/xml/internal/org/jvnet/staxex/MtomEnabled.class
> com/sun/xml/internal/org/jvnet/staxex/StAxSOAPBody.class
> com/sun/xml/internal/org/jvnet/staxex/StAxSOAPBody$Payload.class
> com/sun/xml/internal/org/jvnet/staxex/util/MtomStreamWriter.class
> com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxReaderEx.class
> com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxReaderEx$1.class
> com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxWriter.class
> com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxWriter$1.class
> com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxWriter$1$1.class
> com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxWriterEx.class
> com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxWriterEx$1.class
> com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxWriterEx$1$1.class
> com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxWriterEx$1$2.class
> com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxWriterEx$2.class
> com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxWriterEx$State.class

Before this change, the dependences are clean:
   JAXB depends on JAF
   SAAJ depends on JAXB and JAF
   JAX-WS depends on SAAJ, JAXB, and JAF

com.sun.xml.internal.org.jvnet.** packages are part of JAXB. With the above new classes included in JAXB packages, it causes JAXB to depend on javax.xml.soap API in SAAJ and hence the circular dependency.

This new dependency prevents JAX-WS, SAAJ, JAXB from separating into separate modules.

One way to eliminate such dependency is to move:
src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/staxex/BinaryText.java
src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/staxex/MtomEnabled.java
src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxReaderEx.java
src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxWriter.java
src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/staxex/util/SaajStaxWriterEx.java
src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/staxex/StAxSOAPBody.java

into a separate package that is only used by SAAJ (assuming these classes are intended only for SAAJ to use).