ArrayDescriptor + DataSource = ClassCastException

Question

Hi all,
I have an issue with creating ArrayDescriptors in JRun 4 when using a DataSource. I've seen this issue in a few posts in different forums but no viable solutions. The problem is that JRun returns a JRunDataSource which then returns a JRunConnectionHandle-JRunConnection. The oracle.sql.ArrayDescriptor constructor requires a connection to be passed as a parameter. When I pass the connection I obtain from the JRunDataSource, I get a ClassCastException since it's trying to cast the JRunConnectionHandle-JRunConnection to an OracleConnection.
I've seen a few solutions which suggest using getPhysicalConnection( ) to obtain the inner connection from the JRun Wrapped Connection and then pass that connection to the ArrayDescriptor. However, this would require that I make my application only compatible with JRun since getPhysicalConnection( ) is a method of JRunConnectionHandle-JRunConnection.
I had the same issue when I placed this application in Tomcat 5.5 since the DataSource returned by Tomcat is a BasicDataSource which then returns a PoolableConnection. However, in Tomcat, I was able to configure the DataSource in the Server.xml by adding type= "oracle.jdbc.pool.OracleDataSource" and factory="oracle.jdbc.pool.OracleDataSourceFactory". After configuring the DataSource with these two Attributes, an OracleDataSource was returned instead of a BasicDataSource in Tomcat. I was hoping to have a similar solution for JRun since this solution does not require any server specific code in my application.
Below is my configuration for both Tomcast 5.5 and JRun 4. Tomcat returns an OracleDataSource which is what I need. JRun returns a JRunDataSource which causes a ClassCastException when I use its connections for an ArrayDescriptor. Any help is greatly appreciated:
Tomcat 5.5
name="jdbc/my_jndi_name" auth="Container" type="oracle.jdbc.pool.OracleDataSource" factory="oracle.jdbc.pool.OracleDataSourceFactory"
maxActive="20" maxIdle="10" maxWait="10000"
driverClassName="oracle.jdbc.driver.OracleDriver"
url="jdbc:oracle:thin:@my_db_url:1521:my_db" user="user" password="pw" connectionCachingEnabled="true"
JRun 4
<data-source>
<dbname>my_jndi_name</dbname>     
<driver>oracle.jdbc.driver.OracleDriver</driver> 
<url>jdbc:oracle:thin:@my_db_url:1521:my_db</url>
<username>user</username>
<password>D46FCD1E3EC74BC58D68FB06AF961666</password>
<encrypted>true</encrypted>
<encryption-class>jrun.security.JRunCrypterForTwofish</encryption-class>
<native-results>true</native-results>
<remove-on-exceptions>true</remove-on-exceptions>
<pool-statements>true</pool-statements>
<initial-connections>1</initial-connections>
<connection-timeout>1200</connection-timeout>
<transaction-timeout>20</transaction-timeout>
<cache-enabled>false</cache-enabled>
<cache-size>5</cache-size>
<cache-refresh-interval>30</cache-refresh-interval>
<jndi-name>my_jndi_name</jndi-name>
<poolname>Pool</poolname>
<minimum-size>0</minimum-size>
<maximum-size>2147483647</maximum-size>
<user-timeout>20</user-timeout>
<skimmer-frequency>420</skimmer-frequency>
<shrink-by>5</shrink-by>
<maximum-soft>true</maximum-soft>
<debugging>false</debugging>
<disable-pooling>false</disable-pooling>
<description>Oracle connection</description>
</data-source>Thank you,
Dave

Answer 1

Hi all,
I have an issue with creating ArrayDescriptors in JRun 4 when using a DataSource. I've seen this issue in a few posts in different forums but no viable solutions. The problem is that JRun returns a JRunDataSource which then returns a JRunConnectionHandle-JRunConnection. The oracle.sql.ArrayDescriptor constructor requires a connection to be passed as a parameter. When I pass the connection I obtain from the JRunDataSource, I get a ClassCastException since it's trying to cast the JRunConnectionHandle-JRunConnection to an OracleConnection.
I've seen a few solutions which suggest using getPhysicalConnection( ) to obtain the inner connection from the JRun Wrapped Connection and then pass that connection to the ArrayDescriptor. However, this would require that I make my application only compatible with JRun since getPhysicalConnection( ) is a method of JRunConnectionHandle-JRunConnection.
I had the same issue when I placed this application in Tomcat 5.5 since the DataSource returned by Tomcat is a BasicDataSource which then returns a PoolableConnection. However, in Tomcat, I was able to configure the DataSource in the Server.xml by adding type= "oracle.jdbc.pool.OracleDataSource" and factory="oracle.jdbc.pool.OracleDataSourceFactory". After configuring the DataSource with these two Attributes, an OracleDataSource was returned instead of a BasicDataSource in Tomcat. I was hoping to have a similar solution for JRun since this solution does not require any server specific code in my application.
Below is my configuration for both Tomcast 5.5 and JRun 4. Tomcat returns an OracleDataSource which is what I need. JRun returns a JRunDataSource which causes a ClassCastException when I use its connections for an ArrayDescriptor. Any help is greatly appreciated:
Tomcat 5.5
name="jdbc/my_jndi_name" auth="Container" type="oracle.jdbc.pool.OracleDataSource" factory="oracle.jdbc.pool.OracleDataSourceFactory"
maxActive="20" maxIdle="10" maxWait="10000"
driverClassName="oracle.jdbc.driver.OracleDriver"
url="jdbc:oracle:thin:@my_db_url:1521:my_db" user="user" password="pw" connectionCachingEnabled="true"
JRun 4
<data-source>
<dbname>my_jndi_name</dbname>     
<driver>oracle.jdbc.driver.OracleDriver</driver> 
<url>jdbc:oracle:thin:@my_db_url:1521:my_db</url>
<username>user</username>
<password>D46FCD1E3EC74BC58D68FB06AF961666</password>
<encrypted>true</encrypted>
<encryption-class>jrun.security.JRunCrypterForTwofish</encryption-class>
<native-results>true</native-results>
<remove-on-exceptions>true</remove-on-exceptions>
<pool-statements>true</pool-statements>
<initial-connections>1</initial-connections>
<connection-timeout>1200</connection-timeout>
<transaction-timeout>20</transaction-timeout>
<cache-enabled>false</cache-enabled>
<cache-size>5</cache-size>
<cache-refresh-interval>30</cache-refresh-interval>
<jndi-name>my_jndi_name</jndi-name>
<poolname>Pool</poolname>
<minimum-size>0</minimum-size>
<maximum-size>2147483647</maximum-size>
<user-timeout>20</user-timeout>
<skimmer-frequency>420</skimmer-frequency>
<shrink-by>5</shrink-by>
<maximum-soft>true</maximum-soft>
<debugging>false</debugging>
<disable-pooling>false</disable-pooling>
<description>Oracle connection</description>
</data-source>Thank you,
Dave