JDK-8043550 caused following changeset:

http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/99f5ba331526

which introduced following changes to public API:

javax.swing.tree.TreeNode:
method: Enumeration children()
is changed to: Enumeration<TreeNode> children()

javax.swing.text.AbstractDocument$AbstractElement:
method: Enumeration<?> children()
is changed to: Enumeration<TreeNode> children()

javax.swing.text.AbstractDocument$BranchElement:
method: Enumeration<AbstractElement> children()
is changed to: Enumeration<TreeNode> children()

javax.swing.text.AbstractDocument$LeafElement:
method: Enumeration<?> children()
is changed to: Enumeration<TreeNode> children()

These are not approved by CCC (CCC 8043550 doesn't mention them).

So CCC approving these changes should be created and approved.