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Asked: 2026-06-10T09:58:43+00:00

I am currently running some java code which makes extensive calls to a mysql

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I am currently running some java code which makes extensive calls to a mysql database. These calls are flooding the database and after a few hours of the code running I am getting a nested exception:

java.io.EOFException
    at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1934)
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2380)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2909)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:798)
    at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3700)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1203)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2572)


Last packet sent to the server was 8789 ms ago.
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2592)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2909)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:798)
    at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3700)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1203)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2572)

Unfortunately I do not have much experience with this kind of problem, can anyone recommend ways to ensure all my queries can be processed?

I can appreciate this is a very broad question, but the queries themselves are not difficult, it is more the scale of the number of queries I am requesting.

Thanks

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1 Answer

  1. Editorial Team

    I would troubleshoot this at the OS/MySql/Web server level. In other words, this isn’t a “Java” problem per se. It’s probably much more a “system performance/system configuration” issue.

    SUGGESTION:

    1) You haven’t specified your OS, Web server/application server. These are key.

    2) Run basic performance checks (ps -eaf and iostat for Linux, Task Mgr/CPU/Memory/Networking stats for Windows). Pay particular attention to “netstat” (Linux and Windows).

    3) Look at all the relevant logs (/var/log/messages etc for Linux; EventVwr, etc for Windows)

    4) Check your OS, DB and Web server configuration settings.

    5) Pay particular attention to possible “stale connections” and DB-related “connection pooling” parameters.

    Check these links:

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