How to find out if a socket connection is interrupted

Hi guys
in one of my programs a thread checks every second, if in the DataInputStream of the socket is a new string to show. But if the connection is interrupted, it gets every second the string "null". How can I check if the connection is interrupted???
About a quick answer I would be very happy!
Thanks
P.S.: Excuse my bad english!

If you read the specification of DataInputStream.readLine() you will see that the only time it returns null is at end of stream. At this point you should be closing the socket, not reading it again every second.

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*** Using port 7101 ***
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* To start WebLogic Server, use a username and   *
* password assigned to an admin-level user. For *
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<Feb 17, 2012 5:50:39 AM GMT> <Info> <Security> <BEA-090905> <Disabling CryptoJ JCE Provider self-integrity check for better startup performance. To enable this check, specify -Dweblogic.security.allowCryptoJDefaultJCEVerification=true>
<Feb 17, 2012 5:50:39 AM GMT> <Info> <Security> <BEA-090906> <Changing the default Random Number Generator in RSA CryptoJ from ECDRBG to FIPS186PRNG. To disable this change, specify -Dweblogic.security.allowCryptoJDefaultPRNG=true>
<Feb 17, 2012 5:50:39 AM GMT> <Info> <WebLogicServer> <BEA-000377> <Starting WebLogic Server with Java HotSpot(TM) Client VM Version 19.1-b02 from Sun Microsystems Inc.>
<Feb 17, 2012 5:50:40 AM GMT> <Info> <Management> <BEA-141107> <Version: WebLogic Server 10.3.5.0 Fri Apr 1 20:20:06 PDT 2011 1398638 >
<Feb 17, 2012 5:50:42 AM GMT> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STARTING>
<Feb 17, 2012 5:50:42 AM GMT> <Info> <WorkManager> <BEA-002900> <Initializing self-tuning thread pool>
<Feb 17, 2012 5:50:42 AM GMT> <Notice> <LoggingService> <BEA-320400> <The log file C:\Documents and Settings\Administrator\Application Data\JDeveloper\system11.1.1.5.37.60.13\DefaultDomain\servers\DefaultServer\logs\DefaultServer.log will be rotated. Reopen the log file if tailing has stopped. This can happen on some platforms like Windows.>
<Feb 17, 2012 5:50:42 AM GMT> <Notice> <LoggingService> <BEA-320401> <The log file has been rotated to C:\Documents and Settings\Administrator\Application Data\JDeveloper\system11.1.1.5.37.60.13\DefaultDomain\servers\DefaultServer\logs\DefaultServer.log00220. Log messages will continue to be logged in C:\Documents and Settings\Administrator\Application Data\JDeveloper\system11.1.1.5.37.60.13\DefaultDomain\servers\DefaultServer\logs\DefaultServer.log.>
<Feb 17, 2012 5:50:42 AM GMT> <Notice> <Log Management> <BEA-170019> <The server log file C:\Documents and Settings\Administrator\Application Data\JDeveloper\system11.1.1.5.37.60.13\DefaultDomain\servers\DefaultServer\logs\DefaultServer.log is opened. All server side log events will be written to this file.>
<Feb 17, 2012 5:50:48 AM GMT> <Notice> <Security> <BEA-090082> <Security initializing using security realm myrealm.>
<Feb 17, 2012 5:50:50 AM GMT> <Notice> <LoggingService> <BEA-320400> <The log file C:\Documents and Settings\Administrator\Application Data\JDeveloper\system11.1.1.5.37.60.13\DefaultDomain\servers\DefaultServer\logs\access.log will be rotated. Reopen the log file if tailing has stopped. This can happen on some platforms like Windows.>
<Feb 17, 2012 5:50:50 AM GMT> <Notice> <LoggingService> <BEA-320401> <The log file has been rotated to C:\Documents and Settings\Administrator\Application Data\JDeveloper\system11.1.1.5.37.60.13\DefaultDomain\servers\DefaultServer\logs\access.log00102. Log messages will continue to be logged in C:\Documents and Settings\Administrator\Application Data\JDeveloper\system11.1.1.5.37.60.13\DefaultDomain\servers\DefaultServer\logs\access.log.>
<Feb 17, 2012 5:50:56 AM GMT> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STANDBY>
<Feb 17, 2012 5:50:56 AM GMT> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STARTING>
<MessageLocalizationHelper> <getLocalizedMessage> The resource for bundle "oracle.jrf.i18n.MBeanMessageBundle" with key "oracle.jrf.JRFServiceMBean.checkIfJRFAppliedOnMutipleTargets" cannot be found.
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<Feb 17, 2012 5:51:27 AM GMT> <Notice> <LoggingService> <BEA-320401> <The log file has been rotated to C:\Documents and Settings\Administrator\Application Data\JDeveloper\system11.1.1.5.37.60.13\DefaultDomain\servers\DefaultServer\logs\DefaultDomain.log00208. Log messages will continue to be logged in C:\Documents and Settings\Administrator\Application Data\JDeveloper\system11.1.1.5.37.60.13\DefaultDomain\servers\DefaultServer\logs\DefaultDomain.log.>
<Feb 17, 2012 5:51:27 AM GMT> <Notice> <Log Management> <BEA-170027> <The Server has established connection with the Domain level Diagnostic Service successfully.>
<Feb 17, 2012 5:51:27 AM GMT> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to ADMIN>
<Feb 17, 2012 5:51:27 AM GMT> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to RESUMING>
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<Feb 17, 2012 5:51:27 AM GMT> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to RUNNING>
<Feb 17, 2012 5:51:27 AM GMT> <Notice> <WebLogicServer> <BEA-000360> <Server started in RUNNING mode>
IntegratedWebLogicServer startup time: 51640 ms.
IntegratedWebLogicServer started.
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Hi,
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Hi,
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javax.naming.NamingException: java.net.SocketException: No buffer space available (maximum connections reached?): connect
The number of TCP-Connections was ok (<500).
It would be very nice if someone knows how to find out how the amount of memory that NIO buffers use can be determined within Java 1.4.
best regards
benjamin

We have to use 1.4.2_03. This is because of the special environment we are running on.
We did also figured out that there are some NIO Memory Bugs but we since we are not allowed to upgrade the used Virtual Machine we have to live with these errors.
The problem that we currently have is within a Server and because of this circumstance we are trying to find a workaround or way to find out how many memory is allocated. If we would know how to get this value we could restart the servers as a workaround after the value reaches a threshold.
We are also very sad that we can`t easily upgrade/update to the latest 1.4.2 Version or the newest 1.5 to get rid of these NIO Bugs!

How to find out if a socket connection is interrupted

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