I've got a question about setting up a connection pool using DBCP.
Back when I was testing the nightly build from 20020404, I could swear
I was getting back a PooledDataSource. Now with todays build
(20020523), I am getting back a BasicDatasource.
The code that I have looks like:
DataSource ds = null;
try {
Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
if (envCtx!=null) {
ds = (DataSource)envCtx.lookup("jdbc/utasklistDB");
System.out.println("The Datasource is: " + ds);
}
}
catch (NamingException ne) {
System.out.println("JNDI Lookup Failed: " + ne.getMessage());
}
return ds.getConnection();
What prints out on that first println is:
The Datasource is: org.apache.commons.dbcp.BasicDataSource@22220f
Then, when I attempt to return the connection, I end up getting the
following error:
java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:380)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(Unknown Source)
at org.apache.commons.dbcp.BasicDataSource.getConnection(Unknown Source)
at
com.syntegra.unilever.tasklist.data.ConnectionManager.getConnection(ConnectionManager.java:73)
at com.syntegra.unilever.tasklist.data.Manager.openConn(Manager.java:22)
at
com.syntegra.unilever.tasklist.data.UserManager.getUserByUsername(UserManager.java:201)
at
com.syntegra.unilever.tasklist.services.ValidationServices.validateUser(ValidationServices.java:91)
at
com.syntegra.unilever.tasklist.services.ValidationServices.validateUser(ValidationServices.java:69)
at
com.syntegra.unilever.tasklist.MasterEventGateway$LocalRequestHandler.handleControlEvent(MasterEventGateway.java:80)
at
org.enhydra.barracuda.core.event.DefaultBaseEventListener.handleEvent(DefaultBaseEventListener.java:64)
at
org.enhydra.barracuda.core.event.DefaultEventDispatcher.notifyListeners(DefaultEventDispatcher.java:381)
at
org.enhydra.barracuda.core.event.DefaultEventDispatcher.dispatch(DefaultEventDispatcher.java:183)
at
org.enhydra.barracuda.core.event.DefaultEventDispatcher.dispatchEvent(DefaultEventDispatcher.java:103)
at
org.enhydra.barracuda.core.event.DefaultEventBroker.dispatchEvent(DefaultEventBroker.java:488)
at
org.enhydra.barracuda.core.event.ApplicationGateway.handleDefaultExt(ApplicationGateway.java:413)
at
org.enhydra.barracuda.core.event.ApplicationGateway.handleDefault(ApplicationGateway.java:239)
at
org.enhydra.barracuda.core.event.ApplicationGateway.doGet(ApplicationGateway.java:632)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Unknown
Source)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(Unknown Source)
at org.apache.catalina.core.StandardWrapperValve.invoke(Unknown Source)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(Unknown
Source)
at org.apache.catalina.core.StandardPipeline.invoke(Unknown Source)
at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
at org.apache.catalina.core.StandardContextValve.invoke(Unknown Source)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(Unknown
Source)
at org.apache.catalina.core.StandardPipeline.invoke(Unknown Source)
at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
at org.apache.catalina.core.StandardContext.invoke(Unknown Source)
at org.apache.catalina.core.StandardHostValve.invoke(Unknown Source)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(Unknown
Source)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(Unknown Source)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(Unknown
Source)
at org.apache.catalina.valves.ErrorReportValve.invoke(Unknown Source)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(Unknown
Source)
at org.apache.catalina.core.StandardPipeline.invoke(Unknown Source)
at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
at org.apache.catalina.core.StandardEngineValve.invoke(Unknown Source)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(Unknown
Source)
at org.apache.catalina.core.StandardPipeline.invoke(Unknown Source)
at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
at org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:458)
at org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:551)
at java.lang.Thread.run(Thread.java:484)
So...
First, should BasicDataSource rather than PooledDataSource be
returned? If so, why? How do I utilize a database pool?
Second, why the null pointer at ds.getConnection()? I wasn't getting
that before in my previous nightly build, although I was having other
issues where it wasn't working, which I won't get into here, but ds.getConnection()
did return a
Connection object rather than throw a null pointer exception.
Any hints as to what is up with this? I realize that this is alpha
software, but I'd like to know if I'm even on the right track or if
something in the design has changed...and maybe I should be using DBCP
some different way than I am now???
Jake
--
Best regards,
Jacob mailto:[EMAIL PROTECTED]
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