My JAVA application is run on Tomcat Server with a single MongoDB. This error occurs some times a day.

• Here is an exception message.
  ----------------------------------------------------------------------------------------------------
  com.mongodb.DBPortPool gotError
  WARNING: emptying DBPortPool to /172.20.1.4:27017 b/c of error
  java.net.SocketException: Connection reset
  at java.net.SocketInputStream.read(SocketInputStream.java:189)
  at java.net.SocketInputStream.read(SocketInputStream.java:121)
  at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
  at java.io.BufferedInputStream.read1(BufferedInputStream.java:286)
  at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
  at org.bson.io.Bits.readFully(Bits.java:46)
  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:142)
  at com.mongodb.DBPort.call(DBPort.java:92)
  at com.mongodb.DBTCPConnector.innerCall(DBTCPConnector.java:244)
  at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:216)
  at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:288)
  at com.mongodb.DB.command(DB.java:262)
  at com.mongodb.DB.command(DB.java:244)
  at com.mongodb.DBCollection.getCount(DBCollection.java:985)
  at com.mongodb.DBCursor.size(DBCursor.java:602)
  at com.mysema.query.mongodb.MongodbQuery.list(MongodbQuery.java:271)
  at org.springframework.data.mongodb.repository.support.QueryDslMongoRepository.findAll(QueryDslMongoRepository.java:93)
  at sun.reflect.GeneratedMethodAccessor6078.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:483)
  at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:358)
  at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:343)
  at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
  at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
  at com.sun.proxy.$Proxy586.findAll(Unknown Source)
  ----------------------------------------------------------------------------------------------------
• The code about connecting MongoDB is not different. Here is the code.

MongoClientOptions options = MongoClientOptions.builder()
.connectionsPerHost(50).build();
MongoClient client = new MongoClient(new ServerAddress(dbHost, dbPort),
Arrays.asList(credential), options);
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I can't even guess whether it's caused by a Network problem or a MongoDB java driver.

This issue is really worrying..Please, help me.