Is there anyone encounter this exception when use the java to connect the monogodb?

Warn: emptying DBPortPool to /192.168.0.60:27017 b/c of error
java.io.EOFException
at org.bson.io.Bits.readFully(Bits.java:48)
at org.bson.io.Bits.readFully(Bits.java:33)
at org.bson.io.Bits.readFully(Bits.java:28)
at com.mongodb.Response.<init>(Response.java:40)
at com.mongodb.DBPort.go(DBPort.java:127)
at com.mongodb.DBPort.call(DBPort.java:78)
at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:217)
at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:313)
at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:298)
at com.mongodb.DBCursor._check(DBCursor.java:369)
at com.mongodb.DBCursor._hasNext(DBCursor.java:492)
at com.mongodb.DBCursor.hasNext(DBCursor.java:517)




com.mongodb.MongoException$Network: can't call something : /192.168.0.60:27017/testdb

Caused by: java.io.EOFException
at org.bson.io.Bits.readFully(Bits.java:48)
at org.bson.io.Bits.readFully(Bits.java:33)
at org.bson.io.Bits.readFully(Bits.java:28)
at com.mongodb.Response.<init>(Response.java:40)
at com.mongodb.DBPort.go(DBPort.java:127)
at com.mongodb.DBPort.call(DBPort.java:78)
at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:217)
... 76 more

i trying to solve this issue for several days,search the problem with the google do not turn up any useful answer.

after this exception occur,the web system is still running smoothly.

Hope somebody can give me a hand..