java.sql.SQLRecoverableException:Closed Connection

StackOverflow https://stackoverflow.com/questions/11501500

  •  21-06-2021
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Question

I am using jboss7.0.2 final with Oracle 11. Currently I am facing one issue which happens randomly. But during heavy load this error trace keeps growing. Tried so many approaches couldn't succeed.

MyDatasource Config:

<?xml version="1.0" encoding="UTF-8"?>
<datasource jndi-name="sportPool" pool-name="sportPool" enabled="true" jta="true" use-java-context="true" use-ccm="true">
    <connection-url>jdbc:oracle:thin:@10.11.252.200:1521:sportsdb</connection-url>
    <driver>oracleDriver</driver>
    <pool>
        <min-pool-size>1</min-pool-size>
        <max-pool-size>75</max-pool-size>
        <prefill>false</prefill>
        <use-strict-min>false</use-strict-min>
        <flush-strategy>FailingConnectionOnly</flush-strategy>
    </pool>
    <security>
        <user-name>mportal</user-name>
        <password>mobile</password>
    </security>
    <timeout>
        <idle-timeout-minutes>60000</idle-timeout-minutes>
    </timeout>
</datasource>

StackTrace:

nested exception is java.sql.SQLRecoverableException: Closed Connection
        at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.translate(SQLExceptionSubclassTranslator.java:82)
        at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.translate(SQLErrorCodeSQLExceptionTranslator.java:237)
        at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:604)
        at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:638)
        at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:667)
        at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:683)

        ... 50 more
Caused by: java.sql.SQLRecoverableException: Closed Connection
        at oracle.jdbc.driver.OracleStatement.ensureOpen(OracleStatement.java:4051)
        at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3563)
        at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3628)
        at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1493)
        at org.jboss.jca.adapters.jdbc.CachedPreparedStatement.executeQuery(CachedPreparedStatement.java:111)
        at org.jboss.jca.adapters.jdbc.WrappedPreparedStatement.executeQuery(WrappedPreparedStatement.java:462)
        at org.springframework.jdbc.core.JdbcTemplate$1.doInPreparedStatement(JdbcTemplate.java:645)
        at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:588)
        ... 56 more
Was it helpful?

Solution 2

A quick update on how I fixed this issue. I've done following changes outside of the application i.e in JBOSS

**ironjacamar-jdbc**

  1. Updateed ironjacamar-jdbc jar from 1.0.3 to 1.1.0 at this location "{JBOSS_HOME_7.0.2}/modules/org/jboss/ironjacamar/jdbcadapters/main/"

    Stanalone.xml

As suggested by npe added <check-valid-connection-sql>. 

<datasource jndi-name="sportPool" pool-name="sptPool" enabled="true" jta="true" use-java-context="true" use-ccm="true">
    <connection-url>
        jdbc:oracle:thin:@10.11.252.200:1521:sprtsdb
    </connection-url>
    <driver>
        oracleDriver
    </driver>
    <pool>
        <min-pool-size>1</min-pool-size>
        <max-pool-size>90</max-pool-size>
        <prefill>false</prefill>
        <use-strict-min>false</use-strict-min>
        <flush-strategy>FailingConnectionOnly</flush-strategy>
    </pool>
    <security>
        <user-name>mtal</user-name>
        <password>mle</password>
    </security>
    <validation>
        <check-valid-connection-sql>SELECT 1 FROM DUAL</check-valid-connection-sql>
        <validate-on-match>false</validate-on-match>
        <background-validation>false</background-validation>
        <use-fast-fail>false</use-fast-fail>
    </validation>
    <timeout>
        <idle-timeout-minutes>15</idle-timeout-minutes>
    </timeout>
</datasource>

This solved the problem. But jboss prints warning message "IJ000612" in console which I think should be ok as long as application is getting valid connection object from jboss.

OTHER TIPS

  1. Take a look at your database settings - it's possible, that the timeout set in database is shorter than the timeout set in datasource deployment descriptor, and the database closes the connections.

  2. Check your network - it's possible that there is something wrong with your firewall / routing settings, and the connections are closed/dropped somewhere in the middle of the route.

  3. Take a look at this link JBoss 7 Datasource Configuration. There is a way of configuring a datasource descriptor, forcing the JBoss to check the connection when checking it out from the pool. Use the valid-connection-checker (faster) or check-valid-connection-sql (slower) setting and set the 

    <valid-connection-checker>
    org.jboss.resource.adapter.jdbc.vendor.OracleValidConnectionChecker
</valid-connection-checker>

    or 

    <check-valid-connection-sql>
    SELECT 1 FROM DUAL
</check-valid-connection-sql>

Seems like your are loosing connection, in most cases this happens when there network problems. The configuration you are using is a bit strange;

idle-timeout-minutes = 41 days , default is 15 minutes
min-pool-size = 1

probably the idle-timeout-minutes causing your SQLRecoverableExceptions, I would use a config like;

idle-timeout-minutes = 15 minutes
min-pool-size = 10
max-pool-size = 50 or even less You are using 150MB memory for 75 connections

if you don't have long blocking connection to the database 20 max pool size should be enough.

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