How to reopen a closed connection?

If I'm working on a worksheet, and I lose connection, how do I reopen it?
I try running my code, and the Query Result just says "Closed Connection".
The little connection dropdown list on the top-right corner of the screen gets grayed out when I lose connection.
I can do Control N, and copy/paste my code into the new worksheet window,
but that seems like the wrong way to do it.
Is there any way to just reconnect using my current worksheet window?
Thank you.

SQL Developer Shows "Connection Closed" Error When Running a Query (Doc ID 1297692.1)
Applies to:
Oracle SQL Developer - Version: 2.1.1 and later [Release: and later ]
Microsoft Windows x64 (64-bit) - OS Version: 7
Symptoms
The creation of a new connection goes through fine and the "Test" connection functionality and returns success status. While trying to view any tables, functions, procedures, etc., a "connection closed" message is displayed. Also, running any query returns the same "connection closed" message.
The following error message is seen in the command window:
Exception initializing 'oracle.dbtools.raptor.plsql.PLSQLAddin' in extension 'Oracle SQL Developer': java.lang.NoClassDefFoundError: com/sun/jdi/Bootstrap at oracle.jdevimpl.debugger.jdi.DebugJDIConnector.getVersion(DebugJDIConnector.java:30)
Cause
The SQL Developer download for windows 64-bit version 7 does not come bundled with the jdk. The requirement is to use jdk ver 1.6_11 or above. If the jdk used by the SQL Developer does not meet this requirement, the above mentioned exception happens.
Solution
1) Specify the full path to the right version of the jdk in the
\sqldeveloper\bin\sqldeveloper.conf file in order to make sure that the SQL Developer points to the right jdk such as shown below:
SetJavaHome C:\<full path>\jdk1.6.0_X
2) Set the ORACLE_HOME env variable to the SQL Developer install location.
Set ORACLE_HOME=<TOP_OF_SQLDEV_INSTALLATION location>

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Ok thanks. So I can learn.. what exactly is my
misconception about how it works? My beginner view is
you stored a cursor set from a database query in a
result set then you could iterate through it. Why
does it have to be stored in a collection first? I
was closing the connection before I returned it, or
so I thought. It went through the finally code to
close everytime, but I could still use the results.
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An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION (0xc0000005) occurred at PC=0x77FCAFF8
Function=[Unknown.]
Library=C:\WINNT\system32\ntdll.dll
NOTE: We are unable to locate the function name symbol for the error
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Dynamic libraries:
0x00400000 - 0x0040F000           C:\CFusionMX\runtime\bin\jrun.exe
0x77F80000 - 0x77FFC000           C:\WINNT\system32\ntdll.dll
0x7C570000 - 0x7C624000           C:\WINNT\system32\KERNEL32.dll
0x7C2D0000 - 0x7C335000           C:\WINNT\system32\ADVAPI32.dll
0x77D30000 - 0x77D9F000           C:\WINNT\system32\RPCRT4.dll
0x78000000 - 0x78045000           C:\WINNT\system32\MSVCRT.dll
0x08000000 - 0x082A7000           C:\CFusionMX\runtime\jre\bin\server\jvm.dll
0x77E10000 - 0x77E6F000           C:\WINNT\system32\USER32.dll
0x77F40000 - 0x77F7D000           C:\WINNT\system32\GDI32.dll
0x77570000 - 0x775A0000           C:\WINNT\system32\WINMM.dll
0x10000000 - 0x10007000           C:\CFusionMX\runtime\jre\bin\hpi.dll
0x00770000 - 0x0077E000           C:\CFusionMX\runtime\jre\bin\verify.dll
0x00780000 - 0x00798000           C:\CFusionMX\runtime\jre\bin\java.dll
0x007A0000 - 0x007AD000           C:\CFusionMX\runtime\jre\bin\zip.dll
0x39A70000 - 0x39A7F000           C:\CFusionMX\runtime\jre\bin\net.dll
0x75030000 - 0x75044000           C:\WINNT\system32\WS2_32.dll
0x75020000 - 0x75028000           C:\WINNT\system32\WS2HELP.DLL
0x782C0000 - 0x782CC000           C:\WINNT\System32\rnr20.dll
0x77980000 - 0x779A5000           C:\WINNT\system32\DNSAPI.DLL
0x75050000 - 0x75058000           C:\WINNT\system32\WSOCK32.dll
0x77340000 - 0x77353000           C:\WINNT\system32\iphlpapi.dll
0x77520000 - 0x77525000           C:\WINNT\system32\ICMP.dll
0x77320000 - 0x77337000           C:\WINNT\system32\MPRAPI.dll
0x75150000 - 0x75160000           C:\WINNT\system32\SAMLIB.DLL
0x7CDC0000 - 0x7CE10000           C:\WINNT\system32\NETAPI32.DLL
0x7C340000 - 0x7C34E000           C:\WINNT\system32\Secur32.dll
0x77BF0000 - 0x77C01000           C:\WINNT\system32\NTDSAPI.dll
0x77950000 - 0x7797B000           C:\WINNT\system32\WLDAP32.DLL
0x751C0000 - 0x751C6000           C:\WINNT\system32\NETRAP.dll
0x7CE20000 - 0x7CF0F000           C:\WINNT\system32\OLE32.DLL
0x779B0000 - 0x77A4C000           C:\WINNT\system32\OLEAUT32.DLL
0x773B0000 - 0x773DF000           C:\WINNT\system32\ACTIVEDS.DLL
0x77380000 - 0x773A3000           C:\WINNT\system32\ADSLDPC.DLL
0x77830000 - 0x7783E000           C:\WINNT\system32\RTUTILS.DLL
0x77880000 - 0x7790E000           C:\WINNT\system32\SETUPAPI.DLL
0x7C0F0000 - 0x7C154000           C:\WINNT\system32\USERENV.DLL
0x774E0000 - 0x77514000           C:\WINNT\system32\RASAPI32.dll
0x774C0000 - 0x774D1000           C:\WINNT\system32\rasman.dll
0x77530000 - 0x77552000           C:\WINNT\system32\TAPI32.dll
0x71710000 - 0x71794000           C:\WINNT\system32\COMCTL32.DLL
0x70A70000 - 0x70AD6000           C:\WINNT\system32\SHLWAPI.DLL
0x77360000 - 0x77379000           C:\WINNT\system32\DHCPCSVC.DLL
0x777E0000 - 0x777E8000           C:\WINNT\System32\winrnr.dll
0x777F0000 - 0x777F5000           C:\WINNT\system32\rasadhlp.dll
0x39FB0000 - 0x39FBC000           C:\CFusionMX\runtime\bin\portscan.dll
0x74FD0000 - 0x74FED000           C:\WINNT\system32\msafd.dll
0x75010000 - 0x75017000           C:\WINNT\System32\wshtcpip.dll
0x3AAC0000 - 0x3AAC5000           C:\CFusionMX\runtime\jre\bin\rmi.dll
0x3B9D0000 - 0x3B9D6000           C:\CFusionMX\runtime\jre\bin\ioser12.dll
0x3BBE0000 - 0x3BC60000           C:\CFusionMX\lib\izmjniado.dll
0x3C270000 - 0x3C278000           C:\CFusionMX\lib\CFXNeo.dll
0x780A0000 - 0x780B2000           C:\WINNT\system32\MSVCIRT.dll
0x780C0000 - 0x78121000           C:\WINNT\system32\MSVCP60.dll
0x3C280000 - 0x3C28B000           C:\CFusionMX\lib\cfregistry.dll
0x3C3A0000 - 0x3C3A8000           C:\CFusionMX\lib\PerfmonClient.dll
0x3C5C0000 - 0x3C5CC000           C:\CFusionMX\lib\cfindex.dll
0x3C5D0000 - 0x3C7C2000           C:\CFusionMX\lib\vdk200.dll
0x3C7D0000 - 0x3C805000           C:\CFusionMX\lib\LIBALLRSEI.dll
0x7CA00000 - 0x7CA23000           C:\WINNT\system32\rsaenh.dll
0x7C740000 - 0x7C7CC000           C:\WINNT\system32\CRYPT32.dll
0x77430000 - 0x77441000           C:\WINNT\system32\MSASN1.dll
0x3EE10000 - 0x3EE3E000           C:\CFusion\CustomTags\GetUserGroups.dll
0x77800000 - 0x7781E000           C:\WINNT\system32\WINSPOOL.DRV
0x76620000 - 0x76631000           C:\WINNT\system32\MPR.DLL
0x7CF30000 - 0x7D176000           C:\WINNT\system32\SHELL32.dll
0x3F650000 - 0x3F75A000           C:\CFusionMX\runtime\jre\bin\awt.dll
0x75E60000 - 0x75E7A000           C:\WINNT\system32\IMM32.dll
0x3F760000 - 0x3F7B0000           C:\CFusionMX\runtime\jre\bin\fontmanager.dll
0x72800000 - 0x72846000           C:\WINNT\system32\ddraw.dll
0x728A0000 - 0x728A6000           C:\WINNT\system32\DCIMAN32.dll
0x72CF0000 - 0x72D84000           C:\WINNT\system32\D3DIM700.DLL
0x690A0000 - 0x690AB000           C:\WINNT\system32\PSAPI.DLL
Heap at VM Abort:
Heap
PSYoungGen      total 5824K, used 1523K [0x10010000, 0x10800000, 0x138f0000)
eden space 3520K, 26% used [0x10010000,0x100fa4e0,0x10380000)
from space 2304K, 25% used [0x105c0000,0x106528b0,0x10800000)
to   space 2304K, 0% used [0x10380000,0x10380000,0x105c0000)
PSOldGen        total 29824K, used 22612K [0x138f0000, 0x15610000, 0x30010000)
object space 29824K, 75% used [0x138f0000,0x14f051e0,0x15610000)
PSPermGen       total 20736K, used 20580K [0x30010000, 0x31450000, 0x38010000)
object space 20736K, 99% used [0x30010000,0x314293b0,0x31450000)
Local Time = Fri Dec 13 13:50:53 2013
Elapsed Time = 19424
# The exception above was detected in native code outside the VM
# Java VM: Java HotSpot(TM) Server VM (1.4.2-b28 mixed mode)
space 3520K, 26% used space 2304K, 25% used space 2304K, 0% used space 29824K, 75% used space 20736K, 99% used# An error report file has been saved as hs_err_pid2920.log.
# Please refer to the file for further information.

CF6, Java 1.4.2 and Windows NT - have not seen those for a long time myself.
Perhaps this is the issue from error report:
PSPermGen       total 20736K, used 20580K
object space 20736K, 99% used
I guess Java non heap space Permanent Generation is full the next object trying to load into that space can’t fit, plus all the objects in there are referenced so no objects can be removed so free space can’t be made available. One would need to do some work with Java logging and know what JVM.CONFIG looks like to know if that guess is accurate.
You could try increase that parameter 10Mb or so and see what happens? In JVM.CONFIG, JVM args, -XX:MaxPermSize=NNm where NN = numbers.
Needless to say you are running a lot of end of life product and should plan to migrate to something more current.
HTH, Carl.

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# defaultAutoCommit =
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maxIdle = 10
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minIdle = 5
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# removeAbandoned = false
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Hi,
I understand that you have raised a SR for this issue which is being worked upon by our team.
Additionally, please note that the "Closed connection" error typically happens because a timeout parameter of some sort timed out the connection. This could be a parameter specified in your datasource, in your application code, or network (such as a firewall).
You may also want to -
1. check your database to be sure it is not timing out connections.
2. Make sure your network is running efficiently and that it can provide fast connections,
3. Check your Java Virtual Machine (JVM) Code Cache For Oracle Enterprise Data Quality for any memory related issues
Thanks,
Shwet

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Paul

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