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1. Re: Unable to connect the DB connection Master slave configuration
Hi,
found this: http://blogs.sourceallies.com/2010/03/mysql-masterslave-configuration-with-ejb3-and-jpa/
According to the java snippet in this article, the URL should be "jdbc:mysql:replication://master,slave1,slave2,slave3/databasename"
Hope this helps (I don't have more knowledge about this, just asked google)
Wolfgang
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2. Re: Unable to connect the DB connection Master slave configuration
above link Doesn't help me..Cause I am using JBoss 5.0.1 GA...and above link is for JBoss 4.2.1. The main question is that how to get second URL when first is down which is seprated by url-delimeter. i couldn't get second connection on my Java Bean for my web app.(when 1st connection is down).
@ Wolfgang : any ways thanks
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3. Re: Unable to connect the DB connection Master slave configuration
Hi,
after reading a bit more, I think that we both were mixing two features ;-).
Your config contains a failover configuration, where JBoss will pick another datasource, when the first one is broken: http://community.jboss.org/wiki/JBossJCADatabaseFailover
My link was to a MySQL master/slave configuration, but as the comment in the wiki document suggests, the combination of load balancing and failover connections is a missing feature.
But I also found this document: http://neilhan.blogspot.com/2006/11/spring-hibernate-and-mysql-replication.html - the last comment sounds as if load balancing can be activated by some property. But I don't know whether this applies to JBoss.
Maybe it works to use a combination of both configurations: config a master/slave database with "jdbc:mysql:replication://master,slave1,slave2,slave3/databasename" URL and then add all possible combinations of host names as failover URLs:
"jdbc:mysql:replication://master,slave1,slave2,slave3/databasename|jdbc:mysql:replication://slave1,master,slave2,slave3/databasename|jdbc:mysql:replication://slave2,master,slave1,slave3/databasename|..." (so that each host in the list is the first one)?
If all this does not help, I cannot provider further ideas.
Best regards
Wolfgang
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4. Re: Unable to connect the DB connection Master slave configuration
Hi again,
Now i got something
<local-tx-datasource>
<jndi-name>defaultds</jndi-name>
<connection-url>jdbc:mysql://first , second/DBSchema?something=false</connection-url>
<driver-class>com.mysql.jdbc.Driver</driver-class>
<user-name>blah</user-name>
<password>blah</password>
<!-- The minimum connections in a pool/sub-pool. Pools are lazily constructed on first use -->
<min-pool-size>5</min-pool-size>
<!-- The maximum connections in a pool/sub-pool -->
<max-pool-size>0</max-pool-size>
<metadata>
<type-mapping>mySQL</type-mapping>
</metadata>
</local-tx-datasource>
It got connection but need to Restart the JBoss Application
Condition are
1st
if first connection url is up and second is down
everything is fine now
2nd
if second connection url is up and first is down
got this error
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:1963)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2375)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2874)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1623)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1715)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3243)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3172)
at com.mysql.jdbc.Statement.executeQuery(Statement.java:1197)
at org.jboss.resource.adapter.jdbc.WrappedStatement.executeQuery(WrappedStatement.java:226)
at org.xxxClass.commons.XXXX.XXX.XXX.XXXXX.fetchTitleLabels(JDBCAccessFactory.java:506)
at org.xxxClass.xxx.model.XXX.XXXTitleXX(RegistrationModel.java:70)
at org.xxxClass.xxx.bean.XXXX.getTitleLabels(Registration.java:338)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at javax.el.BeanELResolver.getValue(BeanELResolver.java:62)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72)
at org.apache.el.parser.AstValue.getValue(AstValue.java:118)
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
at org.apache.jasper.el.JspValueExpression.getValue(JspValueExpression.java:101)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:190)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:178)
at javax.faces.component.UISelectItems.getValue(UISelectItems.java:129)
at com.sun.faces.renderkit.SelectItemsIterator.initializeItems(SelectItemsIterator.java:202)
at com.sun.faces.renderkit.SelectItemsIterator.hasNext(SelectItemsIterator.java:135)
at com.sun.faces.renderkit.html_basic.MenuRenderer.renderOptions(MenuRenderer.java:760)
at com.sun.faces.renderkit.html_basic.MenuRenderer.renderSelect(MenuRenderer.java:842)
at com.sun.faces.renderkit.html_basic.MenuRenderer.encodeEnd(MenuRenderer.java:296)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:878)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:295)
at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:185)
at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:129)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1613)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1616)
at org.richfaces.renderkit.html.LayoutRenderer.renderLayout(LayoutRenderer.java:65)
at org.richfaces.renderkit.html.LayoutRenderer.doEncodeChildren(LayoutRenderer.java:45)
at org.ajax4jsf.renderkit.RendererBase.encodeChildren(RendererBase.java:120)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)
at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:277)
at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:258)
at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:200)
at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:195)
at org.ajax4jsf.renderkit.RendererBase.encodeChildren(RendererBase.java:120)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)
at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:277)
at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:258)
at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:200)
at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:195)
at org.ajax4jsf.renderkit.RendererBase.encodeChildren(RendererBase.java:120)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:287)
at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:185)
at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:129)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1613)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)
at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:277)
at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:258)
at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:279)
at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:258)
at org.richfaces.renderkit.html.PageRenderer.doEncodeChildren(PageRenderer.java:265)
at org.richfaces.renderkit.html.PageRenderer.doEncodeChildren(PageRenderer.java:254)
at org.ajax4jsf.renderkit.RendererBase.encodeChildren(RendererBase.java:120)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1613)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1616)
at com.sun.faces.application.view.JspViewHandlingStrategy.doRenderView(JspViewHandlingStrategy.java:420)
at com.sun.faces.application.view.JspViewHandlingStrategy.renderView(JspViewHandlingStrategy.java:209)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:126)
at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)
at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:127)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:313)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.jboss.web.tomcat.service.session.ClusteredSessionValve.invoke(ClusteredSessionValve.java:109)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:601)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:636)
** END NESTED EXCEPTION **
3rd step
When i restart the application with the second conditon again everything is fine....
Please Help!
Message was edited by: Sandeep Bisht
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5. Re: Unable to connect the DB connection Master slave configuration
Hi,
I assume that my previous reply was sent while you were writing your own post?
I saw in the web that you can configure a "connection checker". See e.g. the link in my first reply for a sample. Do you have this checker in your own config, too?
Best regards
Wolfgang
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6. Re: Unable to connect the DB connection Master slave configuration
Hi wolfGang
The Problem has been solved..........
Thanks for your valueble time.
Solution is not exactly as above u provided...but it was really Helpfull for me by some mean
Thanks and Regards
Sandeep Bisht
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7. Re: Unable to connect the DB connection Master slave configuration
1 of 1 people found this helpfulHi All,
I got the Answer of my question. jboss is not pinging to Database so i add the following tag into my *-ds.xml
<local-tx-datasource>
<jndi-name>defaultds</jndi-name>
<connection-url>jdbc:mysql://first , second/DBSchema?something=false</connection-url>
<driver-class>com.mysql.jdbc.Driver</driver-class>
<user-name>blah</user-name>
<password>blah</password>
<!-- The minimum connections in a pool/sub-pool. Pools are lazily constructed on first use -->
<min-pool-size>5</min-pool-size>
<!-- The maximum connections in a pool/sub-pool -->
<max-pool-size>20</max-pool-size>
<autoReconnect>true</autoReconnect>
<failOverReadOnly>true</failOverReadOnly>
<idle-timeout-minutes>0</idle-timeout-minutes>
<valid-connection-checker-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLValidConnectionChecker</valid-connection-checker-class-name>
<metadata>
<type-mapping>mySQL</type-mapping>
</metadata>
</local-tx-datasource>
</datasources>
These Darken tag really Help me out from the failOver condition thanks a lot wolfGang once again