strange periodic socket exceptions

I see the following exception traces at periodic intervals.  There are no 
errors but seem to slow down the application. What can be causing this?

    [java] 16:05:44.354 WARN!! [SocketListener1-3] 
org.mortbay.http.NullableOutputStream.destroy(NullableOutputStream.java:96) 
>08> EXCEPTION
    [java] java.net.SocketException: Software caused connection abort: 
socket write error
    [java]     at java.net.SocketOutputStream.socketWrite0(Native Method)
    [java]     at 
java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
    [java]     at 
java.net.SocketOutputStream.write(SocketOutputStream.java:136)
    [java]     at 
com.jssl.SocketRecordLayer.write(SocketRecordLayer.java:29)
    [java]     at 
com.jssl.internal.SSLProtocol.writeData(SSLProtocol.java:981)
    [java]     at 
com.jssl.internal.SSLProtocol.finish(SSLProtocol.java:283)
    [java]     at com.jssl.internal.SSLProtocol.close(SSLProtocol.java:260)
    [java]     at 
com.jssl.internal.SSLOutputStream.close(SSLOutputStream.java:36)
    [java]     at 
org.mortbay.http.NullableOutputStream.destroy(NullableOutputStream.java:96)
    [java]     at 
org.mortbay.http.HttpOutputStream.destroy(HttpOutputStream.java:405)
    [java]     at 
org.mortbay.http.HttpConnection.destroy(HttpConnection.java:1162)
    [java]     at 
org.mortbay.http.HttpConnection.handle(HttpConnection.java:852)
    [java]     at 
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
    [java]     at 
com.test.sslsupport.jetty.SocketListener.handleConnection(SocketListener.java:169)
    [java]     at 
org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:345)
    [java]     at 
org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:530)

    [java] 16:06:33.922 WARN!! [SocketListener1-4] 
org.mortbay.http.NullableOutputStream.destroy(NullableOutputStream.java:96) 
>08> EXCEPTION
    [java] java.net.SocketException: Connection reset
    [java]     at 
java.net.SocketInputStream.read(SocketInputStream.java:168)
    [java]     at 
com.jssl.SocketRecordLayer.read(SocketRecordLayer.java:25)
    [java]     at 
com.jssl.internal.SSLProtocol.readData(SSLProtocol.java:1002)
    [java]     at 
com.jssl.internal.SSLProtocol.receiveRecord(SSLProtocol.java:862)
    [java]     at 
com.jssl.internal.SSLProtocol.stateReceive(SSLProtocol.java:469)
    [java]     at 
com.jssl.internal.SSLServerProtocol.stateStepImpl(SSLServerProtocol.jav
a:134)
    [java]     at 
com.jssl.internal.SSLProtocol.stateStep(SSLProtocol.java:454)
    [java]     at 
com.jssl.internal.SSLProtocol.finish(SSLProtocol.java:297)
    [java]     at com.jssl.internal.SSLProtocol.close(SSLProtocol.java:260)
    [java]     at 
com.jssl.internal.SSLOutputStream.close(SSLOutputStream.java:36)
    [java]     at 
org.mortbay.http.NullableOutputStream.destroy(NullableOutputStream.java:96)
    [java]     at 
org.mortbay.http.HttpOutputStream.destroy(HttpOutputStream.java:405)
    [java]     at 
org.mortbay.http.HttpConnection.destroy(HttpConnection.java:1162)
    [java]     at 
org.mortbay.http.HttpConnection.handle(HttpConnection.java:852)
    [java]     at 
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
    [java]     at 
com.test.sslsupport.jetty.SocketListener.handleConnection(SocketListener.java:169)
    [java]     at 
org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:345)
    [java]     at 
org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:530)

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