问题：java程序内存溢出java.lang.OutOfMemoryError: GC overhead limit exceeded问题
1)截取log4j相关日志：
java.net.SocketException: Socket input is already shutdown
at java.net.Socket.shutdownInput(Socket.java:1525)
at com.mysql.jdbc.MysqlIO.quit(MysqlIO.java:1683)
at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4388)
at com.mysql.jdbc.ConnectionImpl.cleanup(ConnectionImpl.java:1368)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2654)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2570)
at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1474)
at com.mchange.v2.c3p0.impl.NewProxyStatement.executeQuery(NewProxyStatement.java:35)
at com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnection(DefaultConnectionTester.java:73)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionRe