SRM: The import-properties task has the following errors: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Summary: The socketTimeout can be increased if the import-porperties task keeps failing on socket timeouts due to heavily loaded apg databases.

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Symptoms

The import properties task has the following errors on connectivity to apg databases: 
160627 07:07:57 : com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
160627 07:07:57 :
160627 07:07:57 : The last packet successfully received from the server was 180,025 milliseconds ago. The last packet sent successfully to the server was 180,025 milliseconds ago.

The cause of the exception is:
aused by: java.net.SocketTimeoutException: Read timed out

The socketTimeout as set for each database in APG/Web-Servers/Tomcat/Default/conf/server.xml was in this particular case set to 180000 milliseconds.

Cause

The socketTimeout will be used in the import-properties task to wait for pulling in data from the data_property table.If this time is exceeded due to a heavily loaded database at that time, the task will fail.

Resolution

We can increase the socketTimeout setting in the APG/Web-Servers/Tomcat/Default/conf/server.xml file to e.g. 5 minutes (300000 milliseconds) as per below: 
<!-- Defines the connection to the APG timeseries database for MySQL. -->
	<Resource name="jdbc/APG-DB" auth="Container" type="javax.sql.DataSource" maxActive="20" maxIdle="20" validationQuery="SELECT 1" testOnBorrow="false" testWhileIdle="true" validationQueryTimeout="5" timeBetweenEvictionRunsMillis="10000" minEvictableIdleTimeMillis="60000" maxWait="30000" username="apg" password="watch4net" driverClassName="com.mysql.jdbc.Driver" removeAbandoned="true" removeAbandonedTimeout="60" logAbandoned="true" url="jdbc:mysql://<db hostname>:53306/apg?autoReconnect=true&amp;socketTimeout=300000"/>
 

Affected Products

SRM
Article Properties
Article Number: 000059197
Article Type: Solution
Last Modified: 29 Jul 2025
Version:  4
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