JDK 9 Early Access  b159  is available on java.net, summary of  changes are listed here .

• b159 - JDK-8175261 : Per-protocol cache setting not working for JAR URLConnection
• b158 - JDK-8173028 : Incorrect processing of supplementary-plane characters in text fields
  
• b158 - JDK-8172967 : [macosx] Exception while working with layout for text containing unmappable character
• b158 - JDK-8173804 : javadoc throws UnsupportedOperationException: should not happen
• b157 - JDK-8174073 : NPE caused by @link reference to class
• b156 - JDK-8172726 : ForkJoin common pool retains a reference to the thread context class loader

The following changeset is included in jdk-9+158:
   http://hg.openjdk.java.net/jdk9/dev/jdk/rev/8b0d55e02f54

If you have a user-defined Policy implementation that grants FilePermission on ${user.dir}/-, reading a file in the current directory using its base name will fail.  Still the same solution: Ensure that the path used in permission granting has the same style as the one how you access the file.

Other areas of interest

• JDK 9 Developer Guide [1]
  
• JDK 9 Migration Guide [2]
• JDK Cryptographic Roadmap [3]
  

Finaly, Dalibor and I gave a presentation at FOSDEM the video is available here [4]

Rgds,Rory

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Rgds,Rory O'Donnell
Quality Engineering Manager
Oracle EMEA , Dublin, Ireland