Hi,
after some hours of fun I can say YES it works.
My configuration:
JDE DEMO E900
TR 8.98.31
JDeveloper 10.1.3.4
After installation it's iimportant to test that web client work;
then ensure that in demo\ini\sbf the jdbj.ini is configured correctly (as the jdbj used for web client in system/j2ee/.../classes)
I was able to connect from JDeveloper to JDE in order to create a Value Object from wizard.
Best Regards and Happy New Year