Trouble packaging JavaDelegate for use with flowable-task

TTBruce · October 10, 2018, 9:26pm

Please bear with me, as I am quite new to Java/Maven.

I’m trying to create a JavaDelegate to use as a service task in a workflow. I have successfully created a simple JavaDelegate, however I am having trouble with dependencies when trying to create a more complex class.

I built the WARs using the following instructions:

And I copied the JAR files to my tomcat webapps folder.

I then created a new Maven project in Eclipse and put my JavaDelegate in a package to distribute as JAR. I put the JAR file in apache-tomcat-9.0.12\webapps\flowable-task\WEB-INF\lib

This worked, and allowed me to execute the JavaDelegate from the task ui.

I then added some dependencies and made a more complex class that accesses Microsoft’s Graph API. The class worked fine when executed within Eclipse using a main method, but when I try to run the JavaDelegate, I get classnotfoundexception errors. I’ve tried manually copying JAR files to the flowable-task lib directory, but haven’t had any luck. How can I make sure all of the dependencies are included? Should I somehow be adding my JavaDelegate to the same project as the flowable-task ui and have it included in the produced WAR file?

Thanks for any help and apologies for the stupid questions. I’ve learned a lot in the last few days but am still utterly confused about how to properly deploy my JavaDelegate classes!

One extra question: If I add my JavaDelegate to the flowable-task lib, will it still be executed when I complete a task via flowable-rest?

TTBruce · October 11, 2018, 12:43pm

Here’s what I get when I try adding a jar containing my class and all of the dependencies in apache-tomcat-9.0.12\webapps\flowable-task\WEB-INF\lib

11-Oct-2018 08:40:22.972 SEVERE [main] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/flowable-task]]
at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:441)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:743)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:719)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:703)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:986)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1858)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)
at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:772)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:426)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1585)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:308)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:424)
at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:367)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:969)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:839)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1429)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)
at java.util.concurrent.FutureTask.run(Unknown Source)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:944)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:261)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:770)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Catalina.start(Catalina.java:682)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:350)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:492)
Caused by: java.lang.SecurityException: Invalid signature file digest for Manifest main attributes
at sun.security.util.SignatureFileVerifier.processImpl(Unknown Source)
at sun.security.util.SignatureFileVerifier.process(Unknown Source)
at java.util.jar.JarVerifier.processEntry(Unknown Source)
at java.util.jar.JarVerifier.update(Unknown Source)
at java.util.jar.JarFile.initializeVerifier(Unknown Source)
at java.util.jar.JarFile.getInputStream(Unknown Source)
at org.apache.catalina.webresources.AbstractSingleArchiveResource.getJarInputStreamWrapper(AbstractSingleArchiveResource.java:39)
at org.apache.catalina.webresources.AbstractArchiveResource.doGetInputStream(AbstractArchiveResource.java:230)
at org.apache.catalina.webresources.AbstractResource.getInputStream(AbstractResource.java:93)
at org.apache.catalina.loader.WebappClassLoaderBase.getResourceAsStream(WebappClassLoaderBase.java:1089)
at org.apache.catalina.startup.ContextConfig.populateJavaClassCache(ContextConfig.java:2240)
at org.apache.catalina.startup.ContextConfig.populateJavaClassCache(ContextConfig.java:2232)
at org.apache.catalina.startup.ContextConfig.populateJavaClassCache(ContextConfig.java:2246)
at org.apache.catalina.startup.ContextConfig.populateJavaClassCache(ContextConfig.java:2229)
at org.apache.catalina.startup.ContextConfig.checkHandlesTypes(ContextConfig.java:2133)
at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2083)
at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:2029)
at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1999)
at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1952)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1156)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:765)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5007)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
… 38 more

11-Oct-2018 08:40:22.972 SEVERE [main] org.apache.catalina.startup.HostConfig.deployWAR Error deploying web application archive [C:\Program Files\apache-tomcat-9.0.12\webapps\flowable-task.war]
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/flowable-task]]
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:747)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:719)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:703)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:986)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1858)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)
at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:772)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:426)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1585)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:308)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:424)
at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:367)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:969)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:839)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1429)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)
at java.util.concurrent.FutureTask.run(Unknown Source)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:944)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:261)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:770)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Catalina.start(Catalina.java:682)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:350)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:492)

martin.grofcik · October 15, 2018, 7:00am

Hi,

The problem is exactly (as you wrote) , class is missing in the class path.
You can use maven to build a jar with all dependencies (omit flowable api which is provided in that case). (https://stackoverflow.com/questions/1729054/including-dependencies-in-a-jar-with-maven)

Martin

TTBruce · October 15, 2018, 2:11pm

Thanks for your help.

I was able to build the jar file by adding the code in the link you provided to my pom.xml file:

maven-assembly-plugin package single jar-with-dependencies

In order to exclude the Flowable API, I added “<scope>provided</scope>” within the dependency tags for the Flowable dependency.

Everything working great now.

Cheers,

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Trouble packaging JavaDelegate for use with flowable-task

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