Spring context initialization fails in WorkItemHandler.executeWorkItem()

[Ross Adamson]

I have a custom WorkItemHandler which initializes a Spring context using

new ClassPathXmlApplicationContext("classpath:workflow-beans.xml")

At first, the context failed to initialize due to Spring not being able to find the workflow-beans.xml file at all. So, I found out that you can pass in a classLoader into the custom WorkItemHandler constructor and use that passed in classLoader to initialize Spring. So I did that:

               context = new ClassPathXmlApplicationContext("classpath:workflow-beans.xml") {

                    @Override

                    protected void initBeanDefinitionReader(XmlBeanDefinitionReader reader) {

                        super.initBeanDefinitionReader(reader);

                        reader.setBeanClassLoader(passedInClassLoader);

                        setClassLoader(passedInClassLoader);

                    }

                };

My workflow-beans.xml file is:

<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

       xmlns:context="http://www.springframework.org/schema/context"

       xsi:schemaLocation="http://www.springframework.org/schema/beans

    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd

    http://www.springframework.org/schema/context

    http://www.springframework.org/schema/context/spring-context-2.5.xsd">

    <context:component-scan base-package="com.company.project" />

</beans>

When using the passed in classLoader to initialize the Spring context, it fails with an error like so:

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: URL [jar:file:/data/maven/repositories/kie/com/company/project/my-workflow-kjar/18.05.1-SNAPSHOT/my-workflow-18.05.1-SNAPSHOT.jar!/com/company/workflow/registration/MessageConsumer.class]; nested

 exception is java.io.FileNotFoundException: JAR entry com/company/workflow/registration/MessageConsumer.class not found in /data/maven/repositories/kie/com/company/project/my-workflow/18.05.1-SNAPSHOT/my-workflow-18.05.1-SNAPSHOT.jar

Now, I can see that the class it fails to find is there in the JAR, but the path it's looking for is slightly incorrect -- it's missing "project" after "com/company/". It should be looking for

!/com/company/project/workflow/registration/MessageConsumer.class

instead of

!/com/company/workflow/registration/MessageConsumer.class

Do you know why it would be dropping part of the package name from the path of the class it's searching for?

Also, in general, what is the best way to use Spring inside custom WorkItemHandlerS?

[Maciej Swiderski]

I am not aware of anything that would drop package names or manipulate them in anyway.  could it be there are some references (some leftovers) to that package on the classpath?

Maciej

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[Ross Adamson]

I was able to get passed the exception by removing the MessageConsumer class out of the KJAR (I ended up not needing it anyway). Once my KJAR had zero java class files in it, the Spring initialization worked.

Ross

Maciej

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