SQLRecoverableException I O Exception Connection reset

Question

Yesterday evening I left the office with a running Java program written by me  It should insert a lot of records into our company database  Oracle  using a JDBC connection  This morning when I came back to work I saw this error  caught by a try-catch       java sql SQLRecoverableException  I O Exception  Connection reset   The program wrote almost all records before getting this problem  but what if it happens early  just minutes after I leave the office at evening   I cannot understand what happened  I contacted my database admin and he said there was no particular issue on the database   Any idea on what happened and what can I do do to avoid it

User · Answer

Solution  Change the setup for your application  so you this parameter -Djava security egd file  dev    dev urandom  next to the java command   java -Djava security egd file  dev    dev urandom  your command   Ref  - https   community oracle com thread 943911

User · Answer

I had a similar situation when reading from Oracle in a Spark job   This connection reset error was caused by an incompatibility between the Oracle server and the JDBC driver used   Worth checking it

User · Answer

add java security in your run command java -jar -Djava security egd  quot file    dev urandom quot  yourjarfilename jar

User · Answer

We experienced these errors intermittently after upgraded from 11g to 12c and our java was on 1 6   The fix for us was to upgrade java and jdbc from 6 to 7  export JAVA HOME   usr java1 7   export CLASSPATH  u01 app oracle product 12 1 0 dbhome 1 jdbc libojdbc7 jar  CLASSPATH    Several days later  still intermittent connection resets   We ended up removing all the java 7 above   Java 6 was fine   The problem was fixed by adding this to our user bash profile   Our groovy scripts that were experiencing the error were using  dev random on our batch VM server   Below forced java and groovy to use  dev urandom   export JAVA OPTS    JAVA OPTS -Djava security egd file    dev urandom

User · Answer

Your exception says it all  Connection reset    The connection between your java process and the db server was lost  which could have happened for almost any reason like network issues   The SQLRecoverableException just means that its recoverable  but the root cause is connection reset

User · Answer

This simply means that something in the backend   DBMS   decided to stop working due to unavailability of resources etc  It has nothing to do with your code or the number of inserts   You can read more about similar problems here    http   kr forums oracle com forums thread jspa threadID 941911 http   forums oracle com forums thread jspa messageID 3800354   This may not answer your question  but you will get an idea of why it might be happening  You could further discuss with your DBA and see if there is something specific in your case

User · Answer

I want to produce a complementary answer of nacho-soriano s solution      I recently search to solve a problem where a Java written application  a Talend ELT job in fact  want to connect to an Oracle database  11g and over  then randomly fail  OS is both RedHat Enterprise and CentOS  Job run very quily in time  no more than half a minute  and occur very often  approximately one run each 5 minutes    Some times  during night-time as work-time  during database intensive-work usage as lazy work usage  in just a word randomly  connection fail with this message   Exception in component tOracleConnection 1 java sql SQLRecoverableException  Io exception  Connection reset         at oracle jdbc driver SQLStateMapping newSQLException SQLStateMapping java 101          at oracle jdbc driver DatabaseError newSQLException DatabaseError java 112          at oracle jdbc driver DatabaseError throwSqlException DatabaseError java 173          at oracle jdbc driver DatabaseError throwSqlException DatabaseError java 229          at oracle jdbc driver DatabaseError throwSqlException DatabaseError java 458          at oracle jdbc driver T4CConnection logon T4CConnection java 411          at oracle jdbc driver PhysicalConnection  lt init gt  PhysicalConnection java 490          at oracle jdbc driver T4CConnection  lt init gt  T4CConnection java 202          at oracle jdbc driver T4CDriverExtension getConnection T4CDriverExtension java 33          at oracle jdbc driver OracleDriver connect OracleDriver java 465          at java sql DriverManager getConnection DriverManager java 664          at java sql DriverManager getConnection DriverManager java 208      and StackTrace follow       Problem explanation   As detailed here  Oracle connection needs some random numbers to assume a good level of security  Linux random number generator produce some numbers bases keyboard and mouse activity  among others  and place them in a stack  You will grant me  on a server  there is not a big amount of such activity  So it can occur that softwares use more random number than generator can produce   When the pool is empty  reads from  dev random will block until additional environmental noise is gathered  And Oracle connection fall in timeout  60 seconds by default    Solution 1 - Specific for one app solution  The solution is to give add two parameters given to the JVM while starting   -Djava security egd file  dev   urandom -Dsecurerandom source file  dev   urandom   Note  the       is important  do not drop it    So the launch command line could be   java -Djava security egd file  dev   urandom -Dsecurerandom source file  dev   urandom -cp  lt classpath directives gt  appMainClass  lt app options and parameters gt    One drawback of this solution is that numbers generated are a little less secure as randomness is impacted  If you don t work in a military or secret related industry this solution can be your   Solution 2 - General Java JVM solution  As explained here  Both directives given in solution 1 can be put in Java security setting file   Take a look at  JAVA HOME jre lib security java security  Change the line  securerandom source file  dev random   to  securerandom source file  dev urandom   Change is effective immediately for new running applications   As for solution  1  one drawback of this solution is that numbers generated are a little less secure as randomness is impacted  This time  it s a global JVM impact  As for solution  1  if you don t work in a military or secret related industry this solution can be your   We ideally should use  file  dev   urandom  after Java 5 as previous path will again point to  dev random   Reported Bug   https   bugs openjdk java net browse JDK-6202721  Solution 3 - Hardware solution  Disclamer  I m not linked to any of hardware vendor or product      If your need is to reach a high quality randomness level  you can replace your Linux random number generator software by a piece of hardware   Some information are available here   Regards  Thomas

User · Answer

The error occurs on some RedHat distributions  The only thing you need to do is to run your application with parameter java security egd file    dev urandom   java -Djava security egd file    dev urandom  your command

[java] SQLRecoverableException: I/O Exception: Connection reset

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