Exception handling request to /camunda/api/engine/engine when redeploying a project

kontrag · April 1, 2019, 12:15pm

Hi,

I use IntelliJ IDEA to write my process applications projects and I have configured that when I click “run”, the process is deployed within my Camunda Full distribution 7.8 package.

What I noticed recently is that when I have some processes running (or maybe this is irrelevant), when I make some changes in the code and click “redeploy”, I get the following error:

14:06:18,446 ERROR [io.undertow.request] (default task-103) UT005023: Exception handling request to /camunda/api/engine/engine/default/filter/4721d275-78b6-11e8-9436-ec2620524153/list: org.jboss.resteasy.spi.UnhandledException: java.lang.NullPointerException
	at org.jboss.resteasy.core.ExceptionHandler.handleApplicationException(ExceptionHandler.java:77)
	at org.jboss.resteasy.core.ExceptionHandler.handleException(ExceptionHandler.java:220)
	at org.jboss.resteasy.core.SynchronousDispatcher.writeException(SynchronousDispatcher.java:175)
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:418)
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:209)
	at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:221)
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56)
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
	at org.camunda.bpm.engine.rest.filter.CacheControlFilter.doFilter(CacheControlFilter.java:41)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.camunda.bpm.engine.rest.filter.EmptyBodyFilter.doFilter(EmptyBodyFilter.java:95)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilterSecure(SecurityFilter.java:67)
	at org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilter(SecurityFilter.java:51)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:58)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:56)
	at org.camunda.bpm.webapp.impl.security.SecurityActions.runWithAuthentications(SecurityActions.java:40)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:56)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
	at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
	at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
	at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
	at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
	at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
	at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
	at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
	at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
	at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
	at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
	at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
	at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
	at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
	at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
	at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
	at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:805)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
	at org.camunda.bpm.engine.rest.util.ApplicationContextPathUtil.getApplicationPathForDeployment(ApplicationContextPathUtil.java:53)
	at org.camunda.bpm.engine.rest.hal.processDefinition.HalProcessDefinition.fromProcessDefinition(HalProcessDefinition.java:68)
	at org.camunda.bpm.engine.rest.hal.processDefinition.HalProcessDefinitionResolver.resolveNotCachedLinks(HalProcessDefinitionResolver.java:43)
	at org.camunda.bpm.engine.rest.hal.cache.HalCachingLinkResolver.resolveLinks(HalCachingLinkResolver.java:36)
	at org.camunda.bpm.engine.rest.hal.HalLinker.resolve(HalLinker.java:92)
	at org.camunda.bpm.engine.rest.hal.HalResource.embed(HalResource.java:95)
	at org.camunda.bpm.engine.rest.hal.task.HalTaskList.generate(HalTaskList.java:33)
	at org.camunda.bpm.engine.rest.sub.runtime.impl.FilterResourceImpl.convertToHalTaskList(FilterResourceImpl.java:386)
	at org.camunda.bpm.engine.rest.sub.runtime.impl.FilterResourceImpl.convertToHalCollection(FilterResourceImpl.java:378)
	at org.camunda.bpm.engine.rest.sub.runtime.impl.FilterResourceImpl.queryHalList(FilterResourceImpl.java:235)
	at org.camunda.bpm.engine.rest.sub.runtime.impl.FilterResourceImpl.queryList(FilterResourceImpl.java:209)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:139)
	at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:295)
	at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:249)
	at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:138)
	at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:107)
	at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:133)
	at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:101)
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:402)
	... 60 more

When I click “restart server” i don’t get this error.

I don’t know if it’s an IntelliJ setting but how can I find more info about this engine api error?

Thanks

nikola.koevski · April 2, 2019, 6:47am

Hi @kontrag,

It seems like you’re using the internal Rest API intended to be used only by the Camunda Webapps. Is there any specific reason why you’re not using the standard Rest API (https://docs.camunda.org/manual/latest/reference/rest/)?

Best,
Nikola

kontrag · April 2, 2019, 7:47am

Hi Nikola,

Not sure what is the internal Rest API, maybe I use it by accident (?).
Where can I find its documentation?
What I have though, is that i have a customized webapps.war in the deployment folder of the Wildfly server.
But I removed this custom .war and put again the default webapps.war and I still get the error.
So, it seems it’s in my project .war.
But I thought that the calls I make there are the standard Rest API.
For example I make calls like
“http://localhost:8080/engine-rest/task/a_task_instance_id/complete”

Thx

kontrag · April 2, 2019, 5:23pm

I noticed the following:

When I go to the Tasklist app, I hit
http://localhost:8080/camunda/app/tasklist/default/#/

but it immediately redirects me to
http://localhost:8080/camunda/app/tasklist/default/#/?searchQuery=[]&filter=4721d275-78b6-11e8-9436-ec2620524153&sorting=[{"sortBy":"created","sortOrder":"desc"}]

where the filter=4721d275-78b6-11e8-9436-ec2620524153
is the one I get in the error.

How does that link appear?

Thanks

nikola.koevski · July 9, 2019, 7:57am

Hi @kontrag,

Sorry for the late response.

For example I make calls like
“http://localhost:8080/engine-rest/task/a_task_instance_id/complete”

It looks like you are using the correct Rest API. What is the endpoint you are using to deploy your Process Applications from Eclipse? Also, can you provide the Camunda configuration from your standalone.xml?

Regarding your second post, I haven’t encountered anything like that before. Is anything printed in the logs when the redirect happens?

Best,
Nikola