Details
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Enhancement
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Resolution: Done
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Minor
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7.2.0.GA, 7.3.0.GA, 7.3.6.GA
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False
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False
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Undefined
Description
If a driver class (a class implementing java.sql.Driver) is specified as an xa-datasource-class in a driver configuration (in [standalone*/domain].xml), a generic error is reported:
... ERROR [org.jboss.as.controller.management-operation] (ServerService Thread Pool -- 43) WFLYCTL0013: Operation ("add") failed - address: ([
("subsystem" => "datasources"),
("jdbc-driver" => "oracle")
]) - failure description: "WFLYJCA0114: Failed to load datasource class: oracle.jdbc.OracleDriver"
A similar sort of (generic) failure will arise if a driver class is specified as a <datasource-class> (though it is not typical to specify a non-XA datasource class).
It would be more helpful to provide something descriptive indicating that the class cannot be cast to javax.sql.XADataSource which is the underlying reason for the failure - OracleDriver implements the java.sql.Driver interface instead of javax.sql.XADataSource or javax.sql.DataSource. There is a class cast exception raised at a low level - as captured by a Byteman rule (for exception exit from org.jboss.as.connector.subsystems.datasources.JdbcDriverAdd) - and we should know the type to which cast is attempted in the context of the code below.
... [BMAN] WFLYJCA0114: Failed to load datasource class: oracle.jdbc.OracleDriver ... org.jboss.as.controller.OperationFailedException: WFLYJCA0114: Failed to load datasource class: oracle.jdbc.OracleDriver [ "WFLYJCA0114: Failed to load datasource class: oracle.jdbc.OracleDriver" ] ... at org.jboss.as.connector.subsystems.datasources.JdbcDriverAdd.performRuntime(JdbcDriverAdd.java:128) ... at org.jboss.as.controller.AbstractAddStepHandler.performRuntime(AbstractAddStepHandler.java:338) ... at org.jboss.as.controller.AbstractAddStepHandler.execute(AbstractAddStepHandler.java:159) ... at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:999) ... at org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:743) ... at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:467) ... at org.jboss.as.controller.ParallelBootOperationStepHandler$ParallelBootTask.run(ParallelBootOperationStepHandler.java:384) ... at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) ... at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1982) ... at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486) ... at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1348) ... at java.lang.Thread.run(Thread.java:748) ... at org.jboss.threads.JBossThread.run(JBossThread.java:485) ... Caused by: java.lang.ClassCastException: class oracle.jdbc.OracleDriver ... at java.lang.Class.asSubclass(Class.java:3404) ... at org.jboss.as.connector.subsystems.datasources.JdbcDriverAdd.performRuntime(JdbcDriverAdd.java:126)
This type of misconfiguration (specifying a driver class as an xa-datasource-class) could go undetected prior to 7.2 as there was no attempt to instantiate the class (e.g. the xa-datasource-class) unless a pool of the relevant type (an xa-datasource pool) was declared. The resolution is to specify an Oracle implementation class that implements the relevant interface (usually javax.sql.XADataSource) or to remove the xa-datasource-class (e.g. if no xa-datasource pool is to be used) or datasource-class (for non-XA pools neither a driver nor datasource class implementation is usually needed for JDBC 4 compliant implementations).
To reproduce, configuration like the below can be used in standalone*.xml:
<datasource jndi-name="java:jboss/datasources/oracle" pool-name="Oracle" enabled="true" jta="true">
...
<driver>oracle</driver>
<security>
...
</security>
</datasource>
...
<drivers>
<driver name="oracle" module="com.oracle">
<xa-datasource-class>oracle.jdbc.OracleDriver</xa-datasource-class>
</driver>
...
</drivers>
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