topic Re: Can we use activiti-explorer over spring boot activiti engine? in Alfresco Archive

Can we use activiti-explorer over spring boot activiti engine?

sujeeshsvalath — Tue, 27 Sep 2016 02:48:35 GMT

I like the Spring boot version of Activiti since it is seems to be more developer friendly for me as a Spring application developer.But when using activiti-rest what I really miss is the features of activiti-explorer. Now I have to make a choice between following two options for activiti- developmen

Re: Can we use activiti-explorer over spring boot activiti engine?

warper — Wed, 28 Sep 2016 13:00:23 GMT

Hi!
It is possible. Activiti explorer is available in sources. Explode sources jar, make any configuration changes you want, tweak spring configuration, add support for your processes, make new GUI etc.

Re: Can we use activiti-explorer over spring boot activiti engine?

sujeeshsvalath — Wed, 28 Sep 2016 13:15:03 GMT

Hi Warper, thanks for the reply. I am wondering if I add the following maven plugin :
<code>
<dependency>
    <groupId>org.activiti</groupId>
    <artifactId>activiti-explorer</artifactId>
    <version>5.21.0</version>
</dependency>
</code>
in Spring boot, will I be able to run explorer over my boot process engine?

Re: Can we use activiti-explorer over spring boot activiti engine?

warper — Wed, 28 Sep 2016 15:06:52 GMT

I don't think it's that simple, you have to have web servlet support ready in your spring boot application.

Re: Can we use activiti-explorer over spring boot activiti engine?

faizal-manan — Thu, 29 Sep 2016 22:32:56 GMT

You need it embed it manually
http://blog.canang.com.my/2016/05/12/embedding-activiti-explorer-to-your-application/

Re: Can we use activiti-explorer over spring boot activiti engine?

sujeeshsvalath — Fri, 30 Sep 2016 02:42:10 GMT

Thanks Faizal,but the link is broken. I guess that would be the one am looking for. Can you please check..

Re: Can we use activiti-explorer over spring boot activiti engine?

faizal-manan — Fri, 30 Sep 2016 04:46:30 GMT

what kind of error do you get?
I had no problem with the link

Re: Can we use activiti-explorer over spring boot activiti engine?

sujeeshsvalath — Fri, 30 Sep 2016 05:37:30 GMT

Thanks Faizal, am able to access it from another machine. Working on it now.

Re: Can we use activiti-explorer over spring boot activiti engine?

faizal-manan — Fri, 30 Sep 2016 06:00:05 GMT

hmm…
i do nothing

Re: Can we use activiti-explorer over spring boot activiti engine?

sujeeshsvalath — Sat, 01 Oct 2016 04:21:51 GMT

Hi all, I am trying to integrate rest and explorer modules. Following are the steps done:
1. Checked out the whole activiti source
2. Combined rest and explorer sources into a single project.Deleted duplicate files and updated listener in web.xml.
3.Updated pom dependencies, included dependencies from master and another project.

But When I deploy the new war I am getting the following exception:

<code>
Oct 01, 2016 9:39:44 AM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class org.activiti.explorer.servlet.WebConfigurer
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'navigatorManager' defined in class path resource [activiti-ui-context.xml]: Invocation of init method failed; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1578)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
at org.activiti.explorer.servlet.WebConfigurer.contextInitialized(WebConfigurer.java:84)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4994)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5492)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1081)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1877)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at org.activiti.explorer.navigation.TaskNavigator.<init>(TaskNavigator.java:51)
at org.activiti.explorer.navigation.NavigatorManager.afterPropertiesSet(NavigatorManager.java:61)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574)
… 23 more

Oct 01, 2016 9:39:46 AM org.apache.catalina.core.StandardContext listenerStop
SEVERE: Exception sending context destroyed event to listener instance of class org.activiti.explorer.servlet.WebConfigurer
java.lang.IllegalStateException: No WebApplicationContext found: no ContextLoaderListener registered?
at org.springframework.web.context.support.WebApplicationContextUtils.getRequiredWebApplicationContext(WebApplicationContextUtils.java:83)
at org.activiti.explorer.servlet.WebConfigurer.contextDestroyed(WebConfigurer.java:68)
at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:5035)
at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5687)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:160)
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.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1081)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1877)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Oct 01, 2016 9:39:58 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
Oct 01, 2016 9:39:58 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
Oct 01, 2016 9:39:58 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeAdded('org.apache.jasper.compiler.TldLocationsCache', 'org.apache.jasper.compiler.TldLocationsCache@8bc7ad')

</code>

When I checked the source, it seems that exception is because process engine is not initialized.
But I have even uncommneted activiti-custom-context.xml, but it is not working.
Somebody please help in this integration to achieve a single war with full rest and explorer support.

Re: Can we use activiti-explorer over spring boot activiti engine?

faizal-manan — Sat, 01 Oct 2016 04:32:08 GMT

has you set your processEngineName to 'default'?

Re: Can we use activiti-explorer over spring boot activiti engine?

sujeeshsvalath — Sat, 01 Oct 2016 04:59:17 GMT

Hi Faizil,
getName
String getName()
The name as specified in 'process-engine-name' in the activiti.cfg.xml configuration file. The default name for a process engine is 'default

But I dont see this file in rest/explorer project!!

Re: Can we use activiti-explorer over spring boot activiti engine?

faizal-manan — Sat, 01 Oct 2016 05:24:08 GMT

I'm referring to origin stacktrace.
<code>
caused by: java.lang.NullPointerException
at org.activiti.explorer.navigation.TaskNavigator.<init>(TaskNavigator.java:51)
at org.activiti.explorer.navigation.NavigatorManager.afterPropertiesSet(NavigatorManager.java:61)
</code>

this error cause by
<code>
public TaskNavigator() {
this.taskService = ProcessEngines.getDefaultProcessEngine().getTaskService();
}
</code>
which it refer to
<code>
public static ProcessEngine getDefaultProcessEngine() {
return getProcessEngine(NAME_DEFAULT);
}
</code>

that's mean something wrong with your processEngineConfiguration.

Referring to <a href="http://activiti.org/userguide/index.html#_configuration">http://activiti.org/userguide/index.html#_configuration</a>
<i>activiti.cfg.xml is not Spring style of building a process engine</i>
You'll not find activiti.cfg.xml anywhere in spring-boot

Re: Can we use activiti-explorer over spring boot activiti engine?

sujeeshsvalath — Sun, 02 Oct 2016 02:35:34 GMT

I am able to deploy it at last. But facing issues with url mappings. Trying to resolve the same now.

Re: Can we use activiti-explorer over spring boot activiti engine?

sujeeshsvalath — Mon, 03 Oct 2016 07:35:24 GMT

https://forums.activiti.org/content/activiti-rest-explorer-sharing-process-engine-v57, thanks a million for this thread.