Hi I want to be able to set defaultRowPrefetch in tomcat server configuration.
If it is possible, i want to programmatic avoid setting default prefetch row.
Example:
(OracleConnection(conn)).setRowPrefetch(20);
However, I want to set the default row prefetch variable in tomcat server.xml configuration.
<Resource
name="myDataSource"
type="javax.sql.DataSource"
password="#######"
driverClassName="oracle.jdbc.driver.OracleDriver"
<!-- more information -->
/>
You can use attribute "connectionProperties" of Resource tag documented here https://tomcat.apache.org/tomcat-7.0-doc/jdbc-pool.html.
The connection property to set is "defaultRowPrefetch".
Your configuration will be:
<Resource
name="myDataSource"
type="javax.sql.DataSource"
password="#######"
driverClassName="oracle.jdbc.driver.OracleDriver"
connectionProperties="defaultRowPrefetch=20"
<!-- more information -->
/>
To check configuration you can invoke:
(OracleConnection(conn)).getDefaultRowPrefetch();
Related
I deployed WAR file on Websphere console and mapped it to datasource. I am able to test the datasource which I configured with PostgreSQL server details. But my application is not connecting to the server. I am new to WebSphere and could anyone please help me to configure the datasource based on the below context.xml file. My application works well in tomcat but not in Websphere.
I think am doing something wrong in the datasource configuration.
<Resource
name="jdbc/domains/ABC" url="jdbc:postgresql://localhost:5432/postgres"
initConnectionSqls="SET search_path TO my_schme;"
username="abccc"
password="******"
auth="Container"
type="javax.sql.DataSource"
driverClassName="org.postgresql.Driver"
validationQuery="select 1"
initialSize="5"
maxActive="20"
maxIdle="10"
maxWait="-1"
/>
Here is an example based on the most common way to configure data sources in WebSphere Application Server Liberty -- in server.xml (it is also possible to define within the application via the standard #DataSourceDefinition annotation or deployment descriptor, which would be a separate example)
In server.xml,
<featureManager>
<feature>jdbc-4.2</feature>
<feature>jndi-1.0</feature>
... other features
</featureManager>
<dataSource id="ABC" jndiName="jdbc/domains/ABC" type="javax.sql.ConnectionPoolDataSource" validationTimeout="30s">
<jdbcDriver libraryRef="PostGreLib" javax.sql.ConnectionPoolDataSource="org.postgresql.ds.PGConnectionPoolDataSource"/>
<properties url="jdbc:postgresql://localhost:5432/postgres"/>
<containerAuthData user="abccc" password="******"/>
<connectionManager maxPoolSize="20" connectionTimeout="-1"/>
<!-- no equivalents for initialSize and maxIdle -->
<onConnect>SET search_path TO my_schme;</onConnect>
</dataSource>
<library id="PostGreLib">
<file name="C:/PostGreSQL/postgresql-42.1.4.jar"/>
</library>
Here are some helpful knowledge center articles on data source configuration in WebSphere Application Server Liberty,
https://www.ibm.com/support/knowledgecenter/en/SSEQTP_liberty/com.ibm.websphere.wlp.doc/ae/twlp_dep_configuring_ds.html
https://www.ibm.com/support/knowledgecenter/en/SSEQTP_liberty/com.ibm.websphere.liberty.autogen.base.doc/ae/rwlp_feature_jdbc-4.2.html
I have setup session replication between two tomcats running on different machine using mod_jk, when one tomcat is down, my session is getting expired, and when I refresh its going to next tomcat. But ideally, it shouldn't get expired. Any help will be highly appreciated. Here is my config files.
Server.xml
<Engine name="Catalina" defaultHost="localhost" jvmRoute="worker1">
<!--For clustering, please take a look at documentation at:
/docs/cluster-howto.html (simple how to)
/docs/config/cluster.html (reference documentation) -->
<!--
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
-->
<!-- Clustering configuration start -->
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster" channelSendOptions="8">
<!--<Manager className="org.apache.catalina.ha.session.DeltaManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>-->
<Channel className="org.apache.catalina.tribes.group.GroupChannel">
<Membership className="org.apache.catalina.tribes.membership.McastService"
address="228.0.0.4"
port="45564" frequency="500"
dropTime="3000"/>
<Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
<Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
</Sender>
<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="auto" port="4000" autoBind="100"
selectorTimeout="5000" maxThreads="6"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor"/>
</Channel>
<Valve className="org.apache.catalina.ha.tcp.ReplicationValve" />
<ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener" />
workers.properties
# First we define virtual worker's list
worker.list=jkstatus,LoadBalancer
# Enable virtual workers earlier
worker.jkstatus.type=status
worker.LoadBalancer.type=lb
# Add Tomcat instances as workers, three workers in our case
worker.worker1.type=ajp13
worker.worker1.host=localhost
worker.worker1.port=8009
worker.worker2.type=ajp13
worker.worker2.host=10.57.79.232
worker.worker2.port=8019
# Provide workers list to the load balancer
worker.LoadBalancer.balance_workers=worker1,worker2
I have a web application that uses Tomcat 7, Spring MVC 4.0, and JPA (Hibernate implementation). I am migrating this application to jBoss/Wildfly application server.
Currently, the DataSource is injected in the application with JNDI in a Spring configuration file:
<jee:jndi-lookup id="dataSource" jndi-name="jdbc/MY_DB" expected-type="javax.sql.DataSource" />
The data source itself is defined in $CATALINA_HOME/conf/context.xml in the following way:
<Context>
<Resource name="jdbc/MY_DB"
auth="Container"
type="javax.sql.DataSource"
driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/MY_DB?useUnicode=yes&characterEncoding=UTF-8"
username="user1"
password=""
validationQuery="select 1"
removeAbandoned="true"
removeAbandonedTimeout="120"
maxWait="60"
maxActive="20"
maxIdle="10" />
</Context>
How can I define this JNDI DataSource in JBoss/Wildfly?
First, you must make the JDBC driver available to the application server; then you can configure the data source itself.
See more details in Data Source Configuration in AS 7 and DataSource configuration
I want to set the fixedString=true connection property for the Oracle JDBC driver in the datasource definition in Orion Application Server 2.0.7 (latest stable release).
I've tried the following but didn't work:
<data-source
class="com.evermind.sql.DriverManagerDataSource"
name="datasource_name" location="jdbc/datasource_location"
connection-driver="oracle.jdbc.OracleDriver"
username="user" password="pass"
url="jdbc:oracle:thin:#//database_host:1521/XE" >
<property name="fixedString" value="true" />
</data-source>
Note: I've managed to set the property in Tomcat 6.0 this way (using the same Oracle JDBC driver, of course):
<Resource name="jdbc/datasource_name" auth="Container" type="javax.sql.DataSource"
maxActive="100" maxIdle="30" maxWait="10000"
username="user" password="pass" driverClassName="oracle.jdbc.OracleDriver"
url="jdbc:oracle:thin:#//database_host:1521/XE"
connectionProperties="fixedString=true;"
/>
But I need to set this in Orion. How can I do that?
It is a bug in the oracle application server you have to install OAS 10.1.2.3 has fix for that
My webapp is running on Tomcat 5.5, I declared the datasource in web.xml:
<resource-ref>
<res-ref-name>jdbc/OrdiniWebDS</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
</resource-ref>
In context.xml (tomcat conf):
<Resource
auth="Container"
driverClassName="com.mysql.jdbc.Driver"
maxActive="100"
maxIdle="30"
maxWait="10000"
name="jdbc/OrdiniWebDS"
password="[mypassword]"
type="javax.sql.DataSource"
url="jdbc:mysql://[myHost:port]/ordiniweb"
username="[myusername]"
/>
The database is a MySql 5.0.
Everything works well except that sometimes, after several hours of "unuse", at first access I got this Exception:
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.io.EOFException
STACKTRACE:
java.io.EOFException
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1956)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2368)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2867)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1616)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1708)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3255)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1293)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1428)
at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:93)
at com.blasetti.ordiniweb.dao.OrdiniDAO.caricaOrdine(OrdiniDAO.java:263)
...
** END NESTED EXCEPTION **
Last packet sent to the server was 0 ms ago.
com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2579)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2867)
com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1616)
com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1708)
com.mysql.jdbc.Connection.execSQL(Connection.java:3255)
com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1293)
com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1428)
org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:93)
com.blasetti.ordiniweb.dao.OrdiniDAO.caricaOrdine(OrdiniDAO.java:263)
...
I need to refresh and it works well again. Any idea? Thanks.
MySQL drops unused connections after a while because it assumes that the other side forgot to close it.
What you need to do is to configure a check that Tomcat should apply before it reuses a pooled connection. To do this, add ?autoReconnect=true&useUnicode=true&characterEncoding=utf8 to the end of the URL and add validationQuery="Select 1" to the Resource element:
<Resource
auth="Container"
driverClassName="com.mysql.jdbc.Driver"
maxActive="100"
maxIdle="30"
maxWait="10000"
name="jdbc/OrdiniWebDS"
password="[mypassword]"
type="javax.sql.DataSource"
url="jdbc:mysql://[myHost:port]/ordiniweb?autoReconnect=true&useUnicode=true&characterEncoding=utf8"
username="[myusername]"
validationQuery="Select 1"
/>
[EDIT] This page gives more details: Configuring a MySQL Datasource in Apache Tomcat