TxSupport helper getContent() and openConnection() leaves I/O streams open

When there are large number of transactions in progress, the following exception is thrown:

Caused by: org.jboss.jbossts.star.provider.HttpResponseException: java.net.SocketException: No buffer space available (maximum connections reached?): connect
at org.jboss.jbossts.star.util.TxSupport.httpRequest(TxSupport.java:261)
at org.jboss.jbossts.star.util.TxSupport.startTx(TxSupport.java:179)
...............................
Caused by: java.net.SocketException: No buffer space available (maximum connections reached?): connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)