Migration of process definition via REST api fails with some internal error

Camunda 7 Topics Discussion & Questions
1

+) I generate a migration plan via REST successfully
+) I can validate the generated plan via REST successfully
+) executing the plan fails (seems to fail for some general internal reason):

our installation is a docker with TOMCAT for the engine and an external MariaDB docker

error in localhost.log:
SEVERE [http-nio-8080-exec-1] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [Resteasy] in context with path [/engine-rest] threw exception
org.jboss.resteasy.spi.UnhandledException: java.lang.NullPointerException
at org.jboss.resteasy.core.ExceptionHandler.handleApplicationException(ExceptionHandler.java:78)
at org.jboss.resteasy.core.ExceptionHandler.handleException(ExceptionHandler.java:222)
at org.jboss.resteasy.core.SynchronousDispatcher.writeException(SynchronousDispatcher.java:179)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:422)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:213)
at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:228)
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:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.camunda.bpm.engine.rest.filter.CacheControlFilter.doFilter(CacheControlFilter.java:45)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.camunda.bpm.engine.rest.filter.EmptyBodyFilter.doFilter(EmptyBodyFilter.java:99)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:836)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1747)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
at org.camunda.bpm.engine.rest.dto.migration.MigrationPlanDto.toMigrationPlan(MigrationPlanDto.java:77)
at org.camunda.bpm.engine.rest.impl.MigrationRestServiceImpl.createMigrationPlan(MigrationRestServiceImpl.java:117)
at org.camunda.bpm.engine.rest.impl.MigrationRestServiceImpl.createMigrationPlanExecutionBuilder(MigrationRestServiceImpl.java:92)
at org.camunda.bpm.engine.rest.impl.MigrationRestServiceImpl.executeMigrationPlan(MigrationRestServiceImpl.java:83)
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:140)
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:101)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:406)

has someone any idea ?
Thanks a lot

2

@tpelzer Does any of the versions of process definition doesn’t have atleast one active process instances?

Are you explicitly specifying process definition versions for migration? or all the lower versions of process definitions are been migrated to latest deployments?

Scenario:
Hints: all the lower versions of process definitions are been migrated to latest deployments

In this case, if any of the versions(only lower versions) of process definition doesn’t have active instances, then you need to skip that version for migration to avoid NullPointerException.

3

that seems not to be the problem.
I have only 2 definitions: the old one with a lot of instances and a new empty one.

so my execution plan is just for 2 definitions like this:
{
“sourceProcessDefinitionId”: “AdministrationCamundaUser:1:3f9fb485-d09b-11e9-bf00-0242ac130004”,
“targetProcessDefinitionId”: “AdministrationCamundaUser:2:1189d9c5-200a-11ea-b75b-0242ac130003”,
“instructions”: [

    {
        "sourceActivityIds": [
            "Task_0fsal7k"
        ],
        "targetActivityIds": [
            "Task_0fsal7k"
        ],
        "updateEventTrigger": true
    },
    {
        "sourceActivityIds": [
            "Task_1bfirww"
        ],
        "targetActivityIds": [
            "Task_1bfirww"
        ],
        "updateEventTrigger": true
    }
]

}

4