Camunda deployment.lock errors

Camunda 7 Topics Discussion & Questions
1

Hi,

We are using Camunda7.8, Wildfly10.1 with MariaDB10.1 database and we have been seeing “deployment.lock” errors in the wildfly server logs. This error happens during code install or sometimes during server bounce (saw the same issue with camunda 7.7). I would appreciate if you could please address this issue.

We are using embedded process engine and the datasource section for the camunda database in our domain.xml are as shown below.

<datasource jndi-name="java:jboss/datasources/ProcessEngine"
		   pool-name="ProcessEngine"
		   enabled="true"
		   use-java-context="true"
		   use-ccm="true"
		   jta="true">
	<connection-url>jdbc:mariadb://xxxx:3308/camundabpmn?connectTimeout=60000&amp;socketTimeout=20000</connection-url>
	<driver>org.mariadb</driver>
	<transaction-isolation>TRANSACTION_READ_COMMITTED</transaction-isolation>
	<pool>
		<min-pool-size>10</min-pool-size>
		<max-pool-size>100</max-pool-size>
		<prefill>true</prefill>
		<use-strict-min>false</use-strict-min>
		<flush-strategy>FailingConnectionOnly</flush-strategy>
	</pool>
	<security>
		<user-name>xxxx</user-name>
		<password>xxxx</password>
	</security>
	<validation>
		<valid-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.mysql.MySQLValidConnectionChecker"/>
		<validate-on-match>false</validate-on-match>
		<background-validation>true</background-validation>
		<background-validation-millis>20000</background-validation-millis>
		<use-fast-fail>true</use-fast-fail>
		<exception-sorter class-name="org.jboss.jca.adapters.jdbc.extensions.mysql.MySQLExceptionSorter"/>
	</validation>
	<timeout>
		<blocking-timeout-millis>5000</blocking-timeout-millis>
		<idle-timeout-minutes>15</idle-timeout-minutes>
		<query-timeout>200</query-timeout>
		<allocation-retry>1</allocation-retry>
		<allocation-retry-wait-millis>3000</allocation-retry-wait-millis>
	</timeout>
	<statement>
	   <prepared-statement-cache-size>32</prepared-statement-cache-size>
	   <share-prepared-statements>true</share-prepared-statements>
	</statement>
</datasource>
<drivers>
	<driver name="org.mariadb" module="mariadb">
		<xa-datasource-class>org.mariadb.jdbc.MySQLDataSource</xa-datasource-class>
	</driver>
</drivers>

Error stack trace:

Error querying database. Cause: java.sql.SQLNonTransientConnectionException: Connection timed out

The error may exist in org/camunda/bpm/engine/impl/mapping/entity/Property.xml

The error may involve defaultParameterMap

The error occurred while setting parameters

SQL: SELECT VALUE_ FROM ACT_GE_PROPERTY WHERE NAME_ = ‘deployment.lock’ for update

Cause: java.sql.SQLNonTransientConnectionException: Connection timed out

    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
    at org.camunda.bpm.engine.impl.db.sql.DbSqlSession.lock(DbSqlSession.java:131)
    at org.camunda.bpm.engine.impl.db.entitymanager.DbEntityManager.lock(DbEntityManager.java:268)
    at org.camunda.bpm.engine.impl.db.entitymanager.DbEntityManager.lock(DbEntityManager.java:264)
    at org.camunda.bpm.engine.impl.persistence.entity.PropertyManager.acquireExclusiveLock(PropertyManager.java:31)
    at org.camunda.bpm.engine.impl.cmd.DeployCmd.acquireExclusiveLock(DeployCmd.java:418)
    at org.camunda.bpm.engine.impl.cmd.DeployCmd$1.call(DeployCmd.java:129)
    at org.camunda.bpm.engine.impl.cmd.DeployCmd$1.call(DeployCmd.java:126)
    at org.camunda.bpm.engine.impl.interceptor.CommandContext.runWithoutAuthorization(CommandContext.java:473)
    at org.camunda.bpm.engine.impl.cmd.DeployCmd.doExecute(DeployCmd.java:126)
    at org.camunda.bpm.engine.impl.cmd.DeployCmd.execute(DeployCmd.java:92)
    at org.camunda.bpm.engine.impl.cmd.DeployCmd.execute(DeployCmd.java:72)
    at org.camunda.bpm.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
    at org.camunda.bpm.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:104)
    ... 33 more

Caused by: java.sql.SQLNonTransientConnectionException: Connection timed out
at org.mariadb.jdbc.internal.util.ExceptionMapper.get(ExceptionMapper.java:125)
at org.mariadb.jdbc.internal.util.ExceptionMapper.throwException(ExceptionMapper.java:71)
at org.mariadb.jdbc.MariaDbStatement.executeQueryEpilog(MariaDbStatement.java:226)

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