SJSE 8 doesn't start due to NullPointerException

Hi guys,
I installed SJSE 8 for free (for free headhache I guess) and I can�t start the application. I got a NullPointerException after splash screen. The CPU stays full loaded and error log grows fast to 30, 40 MB!!!
Someone can help me, please!?
Follow part of error log:
[org.netbeans.core.modules] *********** Exception occurred ************ at 12:12 AM on Mar 10, 2006
java.lang.NoClassDefFoundError: org/dom4j/IDResolver
     at com.embarcadero.uml.core.support.umlsupport.XMLManip.getDOMDocument(XMLManip.java:162)
     at com.embarcadero.uml.core.metamodel.core.foundation.CreationFactory.<init>(CreationFactory.java:47)
     at com.embarcadero.uml.core.UMLCreationFactory.<init>(UMLCreationFactory.java:126)
     at com.embarcadero.uml.core.coreapplication.CoreProduct.<init>(CoreProduct.java:130)
     at com.embarcadero.uml.ui.products.ad.applicationcore.ADProduct.<init>(ADProduct.java:170)
     at com.sun.tools.ide.uml.project.UMLProjectModule.getProduct(UMLProjectModule.java:147)
     at com.sun.tools.ide.uml.project.UMLProjectModule.restored(UMLProjectModule.java:60)
     at org.netbeans.core.modules.NbInstaller.loadCode(NbInstaller.java:322)
[catch] at org.netbeans.core.modules.NbInstaller.load(NbInstaller.java:240)
     at org.netbeans.core.modules.ModuleManager.enable(ModuleManager.java:869)
     at org.netbeans.core.modules.ModuleList.installNew(ModuleList.java:382)
     at org.netbeans.core.modules.ModuleList.trigger(ModuleList.java:316)
     at org.netbeans.core.modules.ModuleSystem.restore(ModuleSystem.java:253)
     at org.netbeans.core.NonGui.run(NonGui.java:355)
     at org.netbeans.core.Main.run(Main.java:185)
     at org.netbeans.core.NbTopManager.getNbTopManager(NbTopManager.java:241)
     at org.netbeans.core.NbTopManager.get(NbTopManager.java:190)
     at org.netbeans.core.Main.start(Main.java:311)
     at org.netbeans.core.TopThreadGroup.run(TopThreadGroup.java:90)
     at java.lang.Thread.run(Thread.java:595)

Here are a couple of things you can try. Assuming that the installer downloaded file and the install itself did not have any issues (i.e no pack files in the system etc), the error message seems to indicate that the uml module is not finding some classes it needs to load.
1. Try starting the ide without the uml module.
Rename ide/uml1 directory to ide/uml1.backup and start the ide.
Of course, uml is one of the major features of jse; but by doing the above you may be able to narrow down the problem.
2. There may be some other dom4j library in the system classpath of a different version. You can try opening a command window, setting the CLASSPATH explicitly to an empty value for that session and then run 'runide.exe' from this window.

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    I was wondering if it has anything to do with some X-related upgrades:
    [2015-02-15 09:42] [ALPM] upgraded xorg-server-common (1.16.3-2 -> 1.16.4-1)
    [2015-02-15 09:43] [ALPM] upgraded xorg-server (1.16.3-2 -> 1.16.4-1)
    [2015-02-15 09:48] [ALPM] upgraded xorg-server-devel (1.16.3-2 -> 1.16.4-1)
    [2015-02-15 09:45] [ALPM] upgraded nvidia (346.35-5 -> 346.35-6)
    I tried to downgrade chromimu to 40.0.2214.94-1 and it didn't help. I tried to downgrade nvidia, xorg-server and xorg-server-devel to previous versions, when everything worked and X chouldn't start.
    Other observations are that if I start chromium, the ps command hangs and I have to reboot the system to be able to use ps command again.
    Linux lisa 3.18.6-1-ARCH #1 SMP PREEMPT Sat Feb 7 08:44:05 CET 2015 x86_64 GNU/Linux
    It's worth mentioning that I also run spectrwm, like SgrA, however i don't have other issues with freezing on shutdown etc.

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