Oracle SQL Developer, v1.0.15.57

The SQL Developer is not starting, the splash appears but it freezes after the first four red dots....
Someone knows a solution ?
I run Java SDK 1.5.0-07-b03, Oracle Express 10.2.0.1.0 on a Linux Debian Sarge r2, 2.6.

for testing a gave to the user all rights to write, it still hangs (I also deleted the
.sqldeveloper directory).
Here the dump:
Oracle SQL Developer 1.0
Copyright (c) 2005 Oracle Corporation. All Rights Reserved.
Working directory is /opt/sqldeveloper/jdev/bin
Full thread dump Java HotSpot(TM) Client VM (1.5.0_07-b03 mixed mode):
"TimerQueue" daemon prio=1 tid=0x082d4388 nid=0x5475 in Object.wait() [0x475ea000..0x475ea640]
at java.lang.Object.wait(Native Method)
- waiting on <0x71dcb880> (a javax.swing.TimerQueue)
at javax.swing.TimerQueue.run(TimerQueue.java:233)
- locked <0x71dcb880> (a javax.swing.TimerQueue)
at java.lang.Thread.run(Thread.java:595)
"AWT-EventQueue-0" prio=1 tid=0x082af070 nid=0x5474 in Object.wait() [0x4756a000..0x4756a6c0]
at java.lang.Object.wait(Native Method)
- waiting on <0x71d977f8> (a java.awt.EventQueue)
at java.lang.Object.wait(Object.java:474)
at java.awt.EventQueue.getNextEvent(EventQueue.java:345)
- locked <0x71d977f8> (a java.awt.EventQueue)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:189)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
"AWT-Shutdown" prio=1 tid=0x082aea60 nid=0x5473 in Object.wait() [0x474ea000..0x474ea740]
at java.lang.Object.wait(Native Method)
- waiting on <0x71d8ea10> (a java.lang.Object)
at java.lang.Object.wait(Object.java:474)
at sun.awt.AWTAutoShutdown.run(AWTAutoShutdown.java:259)
- locked <0x71d8ea10> (a java.lang.Object)
at java.lang.Thread.run(Thread.java:595)
"AWT-XAWT" daemon prio=1 tid=0x0828e788 nid=0x5471 runnable [0x473ea000..0x473ea840]
at sun.awt.X11.XToolkit.waitForEvents(Native Method)
at sun.awt.X11.XToolkit.run(XToolkit.java:463)
at sun.awt.X11.XToolkit.run(XToolkit.java:438)
at java.lang.Thread.run(Thread.java:595)
"Java2D Disposer" daemon prio=1 tid=0x0827e960 nid=0x5470 in Object.wait() [0x4734a000..0x4734a4c0]
at java.lang.Object.wait(Native Method)
- waiting on <0x71da3ae0> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116)
- locked <0x71da3ae0> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132)
at sun.java2d.Disposer.run(Disposer.java:107)
at java.lang.Thread.run(Thread.java:595)
"Low Memory Detector" daemon prio=1 tid=0x080c6b40 nid=0x546e runnable [0x00000000..0x00000000]
"CompilerThread0" daemon prio=1 tid=0x080c55e0 nid=0x546d waiting on condition [0x00000000..0x45c52028]
"Signal Dispatcher" daemon prio=1 tid=0x080c4738 nid=0x546c runnable [0x00000000..0x00000000]
"Finalizer" daemon prio=1 tid=0x080b9c00 nid=0x546b in Object.wait() [0x45b0b000..0x45b0b740]
at java.lang.Object.wait(Native Method)
- waiting on <0x71d16d88> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116)
- locked <0x71d16d88> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
"Reference Handler" daemon prio=1 tid=0x080b8f80 nid=0x546a in Object.wait() [0x45a8b000..0x45a8b7c0]
at java.lang.Object.wait(Native Method)
- waiting on <0x71d16e08> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:474)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
- locked <0x71d16e08> (a java.lang.ref.Reference$Lock)
"main" prio=1 tid=0x0805d7a8 nid=0x5468 runnable [0xbfffc000..0xbfffd1f8]
at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:394)
at java.lang.StringBuilder.append(StringBuilder.java:120)
at java.io.FileNotFoundException.<init>(FileNotFoundException.java:59)
at java.io.RandomAccessFile.open(Native Method)
at java.io.RandomAccessFile.<init>(RandomAccessFile.java:212)
at java.io.RandomAccessFile.<init>(RandomAccessFile.java:98)
at oracle.ide.persistence.StorageFile.open(StorageFile.java:157)
at oracle.ide.persistence.NameSpace.init(NameSpace.java:76)
at oracle.ide.persistence.NameSpace.checkInit(NameSpace.java:97)
at oracle.ide.persistence.NameSpace.getNameSpace(NameSpace.java:191)
at oracle.ide.persistence.NameSpace.getNameSpace(NameSpace.java:199)
at oracle.ideimpl.history.HistoryManagerImpl.<clinit>(HistoryManagerImpl.java:70)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at oracle.ideimpl.extension.AddinManagerImpl.createAddin(AddinManagerImpl.java:442)
at oracle.ideimpl.extension.AddinManagerImpl.initializeAddins(AddinManagerImpl.java:225)
at oracle.ideimpl.extension.AddinManagerImpl.initProductAndUserAddins(AddinManagerImpl.java:156)
- locked <0x71dcbcb8> (a oracle.ideimpl.extension.AddinManagerImpl)
at oracle.ide.IdeCore.initProductAndUserAddins(IdeCore.java:1439)
at oracle.ide.IdeCore.startupImpl(IdeCore.java:1204)
at oracle.ide.Ide.startup(Ide.java:672)
at oracle.ideimpl.Main.start(Main.java:49)
at oracle.ideimpl.Main.main(Main.java:25)
"VM Thread" prio=1 tid=0x080b62f8 nid=0x5469 runnable
"VM Periodic Task Thread" prio=1 tid=0x080c7fe0 nid=0x546f waiting on condition

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