Checked this for NetBeans IDE (8, 8.0.2, and nightly build - 201504010001).
JDK 9 ea starting from build 41 fails to register in NetBeans.

This change is introduced from JDK 9 ea b41 based upon:
http://openjdk.java.net/jeps/220
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JDK 9 ea b38: PASS
JDK 9 ea b39: PASS
JDK 9 ea b41: FAIL
JDK 9 ea b47: FAIL
JDK 9 ea b55: FAIL
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See an attached screenshot, (jdk9ea-netbeans.png) depicting change from JDK 9 ea b38 to 41 while registering with NetBeans 8.0.2:
This is likely to impact all the users who are trying to use JDK ea (latest builds) in NetBeans. I'm trying to investigate the likelihood of other applications getting impacted by this.