Problem install SQL Developer in my iMac

Hello everybody!!
I´m a Spanish guy who is starting in the world of databases. This is my first year studying and I´ve always used SQL Developer on Windows but now I would like to use it on Mac.
I have installed the SQL Developer but when I try to create a new connection I get an error message, it says something like:
_"Error de E/S: The Network Adapter could not establish the connection"_
But is very strange for me because in Windows when I want to create a new connection, first of this, I have to create a new user in the SYSTEM connection, but now in Mac this connection (SYSTEM) doesn´t exist.
There are a lot changes between Windows´s version to Mac´s version.... can anyone help me please??
Thanks for your attention and excuse me for my English hehe!

Hi betico,
I have no idea if Oracle 10g Release 2 for Mac OS X Server 10.5.4 might also install and run properly on OS X 10.7.3. I do not use a Mac, but probably your best path forward is to use ...
Oracle VM Virtual Box:
http://www.oracle.com/technetwork/server-storage/virtualbox/downloads/index.html
to run a VM image packaged for a recent Oracle Technology Network Developer Day workshop:
http://www.oracle.com/technetwork/database/enterprise-edition/databaseappdev-vm-161299.html
That VM includes Oracle 11g2 Release 2, SQL Developer, and so on. And if you wish to run SQL Developer directly on OS X, you can still connect to the database running within the VM by altering the VM's network configuration to use a bridged adapter. Here is a post from another thread that discusses that:
Re: Proble to connect oracle DB from Sql Developer
Hope this helps,
Gary

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~ Madrid
http://hrivera99.blogspot.com/

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Duplicate thread Problem running Sql developer in Mac OSX Snow Leopard.

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node name   : ID3806050
pid         : 5496
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-> ms port    : 3601
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-> Admin URL :
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-> run action : NONE
-> enabled    : yes
Used property files
-> files [00] : D:\usr\sap\J2E\JC00\j2ee\cluster\instance.properties
Instance properties
-> ms host    : K-0017553
-> ms port    : 3601
-> os libs    : D:\usr\sap\J2E\JC00\j2ee\os_libs
-> admin URL :
-> run mode   : NORMAL
-> run action : NONE
-> enabled    : yes
Bootstrap nodes
-> [00] bootstrap            : D:\usr\sap\J2E\JC00\j2ee\cluster\instance.properties
-> [01] bootstrap_ID3806000 : D:\usr\sap\J2E\JC00\j2ee\cluster\instance.properties
-> [02] bootstrap_ID3806050 : D:\usr\sap\J2E\JC00\j2ee\cluster\instance.properties
Worker nodes
-> [00] ID3806000            : D:\usr\sap\J2E\JC00\j2ee\cluster\instance.properties
-> [01] ID3806050            : D:\usr\sap\J2E\JC00\j2ee\cluster\instance.properties
[Thr 5312] Tue Dec 02 11:16:19 2008
[Thr 5312] JLaunchRequestQueueInit: create named pipe for ipc
[Thr 5312] JLaunchRequestQueueInit: create pipe listener thread
[Thr 4100] JLaunchRequestFunc: Thread 4100 started as listener thread for np messages.
[Thr 3328] WaitSyncSemThread: Thread 3328 started as semaphore monitor thread.
[Thr 5312] Tue Dec 02 11:16:20 2008
[Thr 5312] INFO: Invalid property value [JLaunchParameters/]
[Thr 5312] JStartupIReadSection: debug mode is specified by program arguments
[Thr 5312] [Node: server0] java home is set by profile parameter
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JStartupIReadSection: read node properties [ID3806050]
-> node name       : server0
-> node type       : server
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-> java vm vendor : Java HotSpot(TM) Server VM (Sun Microsystems Inc.)
-> java vm type    : server
-> java vm cpu     : x86
-> heap size       : 1024M
-> init heap size : 256M
-> root path       : D:\usr\sap\J2E\JC00\j2ee\cluster\server0
-> class path      : .\bin\boot\boot.jar;.\bin\boot\jaas.jar;.\bin\system\bytecode.jar;.
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-> framework class : com.sap.bc.proj.jstartup.JStartupFramework
-> registr. class : com.sap.bc.proj.jstartup.JStartupNatives
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-> shutdown class : com.sap.engine.boot.Start
-> parameters      :
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-> debug mode      : yes
-> debug port      : 50021
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[Thr 3648] JLaunchIStartFunc: Thread 3648 started as Java VM thread.
JHVM_LoadJavaVM: VM Arguments of node [server0]
-> stack   : 262144 Bytes
-> arg[ 0]: exit
-> arg[ 1]: abort
-> arg[ 2]: -Djava.security.policy=./java.policy
-> arg[ 3]: -Djava.security.egd=file:/dev/urandom
-> arg[ 4]: -Dorg.omg.CORBA.ORBClass=com.sap.engine.system.ORBProxy
-> arg[ 5]: -Dorg.omg.CORBA.ORBSingletonClass=com.sap.engine.system.ORBSingletonProxy
-> arg[ 6]: -Djavax.rmi.CORBA.PortableRemoteObjectClass=com.sap.engine.system.PortableRemoteObjectProxy
-> arg[ 7]: -Djco.jarm=1
-> arg[ 8]: -Dsun.io.useCanonCaches=false
-> arg[ 9]: -XX:NewSize=170m
-> arg[ 10]: -XX:MaxNewSize=170m
-> arg[ 11]: -XX:MaxPermSize=192m
-> arg[ 12]: -Djava.awt.headless=true
-> arg[ 13]: -XX:PermSize=192m
-> arg[ 14]: -XX:SurvivorRatio=2
-> arg[ 15]: -XX:TargetSurvivorRatio=90
-> arg[ 16]: -XX:SoftRefLRUPolicyMSPerMB=1
-> arg[ 17]: -verbose:gc
-> arg[ 18]: -XX:+DisableExplicitGC
-> arg[ 19]: -XX:+PrintGCDetails
-> arg[ 20]: -XX:+PrintGCTimeStamps
-> arg[ 21]: -XX:+UseParNewGC
-> arg[ 22]: -Drdbms.driverLocation=D:/Oracle/Ofs33/jdbc/lib/classes12.jar
-> arg[ 23]: -Dsys.global.dir=D:/usr/sap/J2E/SYS/global/
-> arg[ 24]: -Dsys.global.dir=D:\usr\sap\J2E\SYS\global
-> arg[ 25]: -Dapplication.home=D:\usr\sap\J2E\JC00\j2ee\os_libs
-> arg[ 26]: -Djava.class.path=D:\usr\sap\J2E\JC00\j2ee\os_libs\jstartup.jar;.\bin\boot\boot.jar;.\bin\boot\jaas.jar;.\bin\system\bytecode.jar;.
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-> arg[ 29]: -Xnoagent
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-> arg[ 31]: -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=50021
-> arg[ 32]: -Dmemory.manager=1024M
-> arg[ 33]: -Xmx1024M
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-> arg[ 36]: -Djstartup.mode=JCONTROL
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-> arg[ 38]: -Djstartup.ownHardwareId=V0317565360
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-> arg[ 46]: -DSAPDBHOST=
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[Thr 3648] JLaunchIAbortJava: abort hook is called
[Thr 3648] JLaunchCloseProgram: good bye (exitcode=-2)

Dear Netweaver experts,
I found the solution.
I took for my system (Win XP, 2,5 GB RAM) the settings posted below :
Maximum heap size : 512 MB
-Djava.security.policy=./java.policy
-Djava.security.egd=file:/dev/urandom
-Dorg.omg.CORBA.ORBClass=com.sap.engine.system.ORBProxy
-Dorg.omg.CORBA.ORBSingletonClass=com.sap.engine.system.ORBSingletonProxy
-Djavax.rmi.CORBA.PortableRemoteObjectClass=com.sap.engine.system.PortableRemoteObjectProxy
-Djco.jarm=1
-Dsun.io.useCanonCaches=false
-XX:NewSize=170m
-XX:MaxNewSize=170m
-XX:MaxPermSize=192m
-Djava.awt.headless=true
-XX:PermSize=192m
-XX:SurvivorRatio=2
-XX:TargetSurvivorRatio=90
-XX:SoftRefLRUPolicyMSPerMB=1
-Xms512m
-verbose:gc
-XX:+DisableExplicitGC
Best regards,
Daniel
-XX:+PrintGCDetails
-XX:+PrintGCTimeStamps
-XX:+UseParNewGC

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Could you past output from
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Connection problems with SQL Developer -- ANSWERED

running on win2k
connecting to local oracle
1     Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
2     PL/SQL Release 10.2.0.1.0 - Production
3     CORE     10.2.0.1.0     Production
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Message was edited by:
user634867

Sue, thank you very much for the clarification.
I did update the C:\Program Files\sqldeveloper\sqldeveloper\bin\sqldeveloper.conf file file by appending the lines below and it solved the problem.
AddJavaLibFile ../../lib/java/api/jaxb-api.jar
AddJavaLibFile ../../lib/java/api/jsr173_api.jar
AddJavaLibFile ../../j2ee/home/lib/activation.jar
AddJavaLibFile ../../lib/java/shared/sun.jaxb/2.0/jaxb-xjc.jar
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