Hi Clovis,
I've checked on the error that you have mentioned.
According to the hotswapagent logic
*org.hotswap.agent.plugin.tomcat.TomcatPlugin.init()
*method get called during WebappLoader.start lifecycle event. But at the
time STARTING event get fired we haven't set the WebappClassloadingContext
to the WebappClassloader. Therefore when it tries to do some checks in
order to load the resources it throws the NPE.
*org.wso2.carbon.webapp.mgt.loader.CarbonWebappLoader*
@Override
protected void startInternal() throws LifecycleException {
.......
super.startInternal(); ----> In this point STARTING even get fired
and so *TomcatPlugin.init * method get called and it try to get the
resource. That called getResources method and since we haven't still
set the webappClassloadingContext it throws a NPE.
//Adding the WebappClassloadingContext to the WebappClassloader
((CarbonWebappClassLoader)
getClassLoader()).setWebappCC(webappClassloadingContext); // This is the
point where we are setting the webappClassloadingContext
Thanks
Thusitha
On Fri, Jan 22, 2016 at 4:54 PM, Clovis Wichoski <[email protected]>
wrote:
> Hi Kishanthan,
>
> The redeploy all of a small system its ok, but for a big one, its a
> problem, just a change in one class you must redeploy, loose sessions,
> restart the system from scratch, to reach the point of test again, with the
> ideas used by HotSwapAgent they act on reloading only that one class
> changed, this way speeds the development time, these ideas are well
> defended by JRebel tool, that HotSwapAgent tends to be a choice as an open
> source solution. Please note that this feature is only needed for
> development phase, in production, the scheduled task its ok.
>
> I mean time I tested with AS 5.3.0, JRebel and HotSwapAgent, JRebel trial
> worked as expected, but HotSwapAgent not (see exception bellow [1]), I will
> check these problems with HotSwapAgent devs, and try to discover why dont
> works with WSO2 AS as with HotSwapAgent active none of webapps load, all
> get that exception, as we see a NPE in class CarbonWebappClassLoader maybe
> its the way they initialize the dependent class loaders.
>
> [1] Exception when HotSwapAgent is active:
> [2016-01-22 09:14:18,467] ERROR {org.apache.catalina.core.ContainerBase}
> - ContainerBase.addChild: start:
> org.apache.catalina.LifecycleException: Failed to start component
> [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/example]]
> at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
> at
> org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
> at
> org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
> at
> org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)
> at
> org.wso2.carbon.tomcat.internal.CarbonTomcat.addWebApp(CarbonTomcat.java:344)
> at
> org.wso2.carbon.tomcat.internal.CarbonTomcat.addWebApp(CarbonTomcat.java:252)
> at
> org.wso2.carbon.webapp.mgt.TomcatGenericWebappsDeployer.handleWebappDeployment(TomcatGenericWebappsDeployer.java:314)
> at
> org.wso2.carbon.webapp.mgt.TomcatGenericWebappsDeployer.handleWarWebappDeployment(TomcatGenericWebappsDeployer.java:212)
> at
> org.wso2.carbon.webapp.mgt.TomcatGenericWebappsDeployer.handleHotDeployment(TomcatGenericWebappsDeployer.java:179)
> at
> org.wso2.carbon.webapp.mgt.TomcatGenericWebappsDeployer.deploy(TomcatGenericWebappsDeployer.java:144)
> at
> org.wso2.carbon.webapp.mgt.AbstractWebappDeployer.deployThisWebApp(AbstractWebappDeployer.java:224)
> at
> org.wso2.carbon.webapp.mgt.AbstractWebappDeployer.deploy(AbstractWebappDeployer.java:114)
> at
> org.wso2.carbon.webapp.deployer.WebappDeployer.deploy(WebappDeployer.java:42)
> at
> org.apache.axis2.deployment.repository.util.DeploymentFileData.deploy(DeploymentFileData.java:136)
> at
> org.apache.axis2.deployment.DeploymentEngine.doDeploy(DeploymentEngine.java:807)
> at
> org.apache.axis2.deployment.repository.util.WSInfoList.update(WSInfoList.java:144)
> at
> org.apache.axis2.deployment.RepositoryListener.update(RepositoryListener.java:377)
> at
> org.apache.axis2.deployment.RepositoryListener.checkServices(RepositoryListener.java:254)
> at
> org.apache.axis2.deployment.DeploymentEngine.loadServices(DeploymentEngine.java:135)
> at
> org.wso2.carbon.core.CarbonAxisConfigurator.deployServices(CarbonAxisConfigurator.java:567)
> at
> org.wso2.carbon.core.internal.DeploymentServerStartupObserver.completingServerStartup(DeploymentServerStartupObserver.java:51)
> at
> org.wso2.carbon.core.internal.CarbonCoreServiceComponent.notifyBefore(CarbonCoreServiceComponent.java:235)
> at
> org.wso2.carbon.core.internal.StartupFinalizerServiceComponent.completeInitialization(StartupFinalizerServiceComponent.java:185)
> at
> org.wso2.carbon.core.internal.StartupFinalizerServiceComponent.serviceChanged(StartupFinalizerServiceComponent.java:288)
> at
> org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:107)
> at
> org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:861)
> at
> org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
> at
> org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
> at
> org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:819)
> at
> org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:771)
> at
> org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:130)
> at
> org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:214)
> at
> org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:433)
> at
> org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:451)
> at
> org.wso2.carbon.throttling.agent.internal.ThrottlingAgentServiceComponent.registerThrottlingAgent(ThrottlingAgentServiceComponent.java:123)
> at
> org.wso2.carbon.throttling.agent.internal.ThrottlingAgentServiceComponent.activate(ThrottlingAgentServiceComponent.java:100)
> 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:606)
> at
> org.eclipse.equinox.internal.ds.model.ServiceComponent.activate(ServiceComponent.java:260)
> at
> org.eclipse.equinox.internal.ds.model.ServiceComponentProp.activate(ServiceComponentProp.java:146)
> at
> org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:345)
> at
> org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:620)
> at
> org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:197)
> at
> org.eclipse.equinox.internal.ds.Resolver.getEligible(Resolver.java:343)
> at
> org.eclipse.equinox.internal.ds.SCRManager.serviceChanged(SCRManager.java:222)
> at
> org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:107)
> at
> org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:861)
> at
> org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
> at
> org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
> at
> org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:819)
> at
> org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:771)
> at
> org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:130)
> at
> org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:214)
> at
> org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:433)
> at
> org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:451)
> at
> org.wso2.carbon.core.init.CarbonServerManager.initializeCarbon(CarbonServerManager.java:517)
> at
> org.wso2.carbon.core.init.CarbonServerManager.start(CarbonServerManager.java:219)
> at
> org.wso2.carbon.core.internal.CarbonCoreServiceComponent.activate(CarbonCoreServiceComponent.java:91)
> 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:606)
> at
> org.eclipse.equinox.internal.ds.model.ServiceComponent.activate(ServiceComponent.java:260)
> at
> org.eclipse.equinox.internal.ds.model.ServiceComponentProp.activate(ServiceComponentProp.java:146)
> at
> org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:345)
> at
> org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:620)
> at
> org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:197)
> at
> org.eclipse.equinox.internal.ds.Resolver.getEligible(Resolver.java:343)
> at
> org.eclipse.equinox.internal.ds.SCRManager.serviceChanged(SCRManager.java:222)
> at
> org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:107)
> at
> org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:861)
> at
> org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
> at
> org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
> at
> org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:819)
> at
> org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:771)
> at
> org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:130)
> at
> org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:214)
> at
> org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:433)
> at
> org.eclipse.equinox.http.servlet.internal.Activator.registerHttpService(Activator.java:81)
> at
> org.eclipse.equinox.http.servlet.internal.Activator.addProxyServlet(Activator.java:60)
> at
> org.eclipse.equinox.http.servlet.internal.ProxyServlet.init(ProxyServlet.java:40)
> at
> org.wso2.carbon.tomcat.ext.servlet.DelegationServlet.init(DelegationServlet.java:38)
> at
> org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1284)
> at
> org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1197)
> at
> org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1087)
> at
> org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5262)
> at
> org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5550)
> at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
> at
> org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1575)
> at
> org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1565)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.catalina.LifecycleException: Failed to start
> component [WebappLoader[/example]]
> at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
> at
> org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5389)
> at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
> ... 95 more
> Caused by: java.lang.NullPointerException
> at
> org.wso2.carbon.webapp.mgt.loader.CarbonWebappClassLoader.getResources(CarbonWebappClassLoader.java:260)
> at
> org.hotswap.agent.config.PluginConfiguration.<init>(PluginConfiguration.java:64)
> at
> org.hotswap.agent.config.PluginManager.initClassLoader(PluginManager.java:155)
> at
> org.hotswap.agent.config.PluginManager.initClassLoader(PluginManager.java:130)
> at
> org.hotswap.agent.config.PluginRegistry.initializePlugin(PluginRegistry.java:139)
> at
> org.hotswap.agent.util.PluginManagerInvoker.callInitializePlugin(PluginManagerInvoker.java:26)
> at
> org.hotswap.agent.plugin.tomcat.TomcatPlugin.init(TomcatPlugin.java:91)
> at
> org.apache.catalina.loader.WebappLoader.startInternal(WebappLoader.java:634)
> at
> org.wso2.carbon.webapp.mgt.loader.CarbonWebappLoader.startInternal(CarbonWebappLoader.java:55)
> at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
> ... 97 more
>
> TIA
> Clóvis
>
>
>
>
>
> 2016-01-22 5:32 GMT-02:00 Kishanthan Thangarajah <[email protected]>:
>
>> Hi Clovis,
>>
>> On Wed, Jan 20, 2016 at 6:06 PM, Clovis Wichoski <[email protected]>
>> wrote:
>>
>>> Hi,
>>>
>>> I'm researching for some ways to improve speed of development and
>>> redeploy on WSO2 Application Server, for example I have a scenario here
>>> where a simple change on a class, to test, get about 5 minutes. (as the
>>> test must pass by web interfaces in Jaggery, until reach the REST Api
>>> implemented in JAX-RS with Jersey and some JPA using EclipseLink.
>>>
>>> The Jaggery part is very easy, just rsync files, and all works fine.
>>>
>>> For the java part, in this research I found the HotSwapAgent -
>>> http://www.hotswapagent.org/
>>>
>>> My first try was to follow HotSwapAgent quick start as is, and check if
>>> it works with WSO2 AS 5.2.1 out of the box, but dont worked, HotSwapAgent
>>> dont detect changes when I copy one updated .class file to WEB-INF/classes.
>>>
>>> Then my question is about, if anyone tried this before with WSO2, and if
>>> is a good way to invest time to implement a WSO2 plugin that work better
>>> with HotSwapAgent and what is the steps I must follow to implement this
>>> plugin or integrate this type of speed with redeploy with WSO2 AS? Maybe
>>> some problems with OSGi?
>>>
>>
>> This is a good thing to have with webap deployment. But we do have a
>> concept of hot update of webapps which is the default behaviour. If you
>> update the webapp, it will be redeployed by the Application Server where it
>> keeps track of the changes using the scheduled task which runs on every 15
>> seconds interval. Since this redeploys the entire webapp, all the classes
>> loaded will be removed and will be loaded again. Do find any issues with
>> this behaviour?
>>
>> Thanks,
>> Kishanthan.
>>
>>
>>> ps: Note that the idea, is just change one class, rsync the binary
>>> .class file over respective WEB-INF/classes and got the results.
>>>
>>> Best regards
>>>
>>> Clóvis Wichoski
>>> CEO, Neoinix
>>> Mobile: +554588233181
>>>
>>> _______________________________________________
>>> Dev mailing list
>>> [email protected]
>>> http://wso2.org/cgi-bin/mailman/listinfo/dev
>>>
>>>
>>
>>
>> --
>> *Kishanthan Thangarajah*
>> Associate Technical Lead,
>> Platform Technologies Team,
>> WSO2, Inc.
>> lean.enterprise.middleware
>>
>> Mobile - +94773426635
>> Blog - *http://kishanthan.wordpress.com
>> <http://kishanthan.wordpress.com>*
>> Twitter - *http://twitter.com/kishanthan <http://twitter.com/kishanthan>*
>>
>
>
> _______________________________________________
> Dev mailing list
> [email protected]
> http://wso2.org/cgi-bin/mailman/listinfo/dev
>
>
--
Thusitha Dayaratne
Software Engineer
WSO2 Inc. - lean . enterprise . middleware | wso2.com
Mobile +94712756809
Blog alokayasoya.blogspot.com
About http://about.me/thusithathilina
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