Reloading the application context

[nitha]

what are the causes that makes an application to reload?
I am using jboss-4.0.1sp1 version to deploy my application. But the application gets reloaded very often and it throws Null Pointer exception.

Can anyone help me in this...... what causes my application to reload the context

[jaikiran]

There's a hot deployment scanner which looks for the last modified time of the deployment archive or the top level deployment descriptor to decide whether the application needs to be redeployed. Are you doing any changes to the files deployed in the deploy folder of JBoss?

P.S: You have an option of disabling hot deployment scanner by setting the ScanEnabled to false for the DeploymentScanner MBean in %JBOSS_HOME%/server/< serverName>/conf/jboss-service.xml file:

<!-- A flag to disable the scans -->
 <attribute name="ScanEnabled">false</attribute>

[nitha]

Thanks .
Through our application, we are uploading files and is saved in the deploy folder.
Is this causing the application to reload.

[jaikiran]

That wont cause your existing application to be redeployed. But yes, if you put something in the deploy folder, the server will try to deploy these new files (which might even turn out to be invalid deployments). Any specific reason why you are putting the files in the deploy folder? And what types of files are these.

[nitha]

We are uploading ppts, pdfs , images and video files. we have created separate folders for each under the 'deploy' folder.

[jaikiran]

"nitha" wrote:
We are uploading ppts, pdfs , images and video files. we have created separate folders for each under the 'deploy' folder.

Instead of putting them in deploy folder, a better way to do this is explained here http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4042437

[nitha]

Hi ,

We ae facing the same problem. Our production server crashed 4 times with in a week. when we checked the logs..... its trying to reload the context and throws some exception and hangs.......

ERROR [org.apache.commons.modeler.BaseModelMBean] Exception invoking method reload
java.lang.NullPointerException
 at org.jboss.web.tomcat.tc5.WebCtxLoader.start(WebCtxLoader.java:109)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4231)
 at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3043)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:324)
 at org.apache.commons.modeler.BaseModelMBean.invoke(BaseModelMBean.java:503)
 at org.jboss.mx.server.RawDynamicInvoker.invoke(RawDynamicInvoker.java:150)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
 at org.jboss.jmx.adaptor.control.Server.invokeOpByName(Server.java:236)
 at org.jboss.jmx.adaptor.control.Server.invokeOp(Server.java:202)
 at org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.invokeOp(HtmlAdaptorServlet.java:241)
 at org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.processRequest(HtmlAdaptorServlet.java:79)
 at org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.doPost(HtmlAdaptorServlet.java:61)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:75)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
 at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
 at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
 at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
 at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:66)
 at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
 at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:150)
 at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:54)
 at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
 at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
 at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
 at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
 at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
 at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
 at java.lang.Thread.run(Thread.java:534)
2008-10-29 05:22:13,914 ERROR [org.jboss.web.localhost.Engine] StandardWrapperValve[HtmlAdaptor]: Servlet.service() for servlet HtmlAdaptor threw exception
RuntimeOperationsException: Exception invoking method reload Cause: java.lang.NullPointerException
 at org.apache.commons.modeler.BaseModelMBean.invoke(BaseModelMBean.java:511)
 at org.jboss.mx.server.RawDynamicInvoker.invoke(RawDynamicInvoker.java:150)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
 at org.jboss.jmx.adaptor.control.Server.invokeOpByName(Server.java:236)

Any thoughts regarding this...........