Configure jBPM to send mail

This is an updated tutorial which discusses how to send a Mail from within a jBPM Process.
If you are running jBPM 6 / 7, the simplest way to send a Mail from your BPM process is to use the org.jbpm.process.workitem.email.EmailWorkItemHandler..

Here is a sample global/Email.wid :

[
        [
            "name" : "Email",
            "displayName" : "Email",
            "category" : "jbpm-workitems-email",
            "description" : "",
            "defaultHandler" : "mvel: new org.jbpm.process.workitem.email.EmailWorkItemHandler()",
            "documentation" : "jbpm-workitems-email/index.html",

            "parameters" : [
                                "Reply-To" : new StringDataType()
                ,"Cc" : new StringDataType()
                ,"Bcc" : new StringDataType()
                ,"From" : new StringDataType()
                ,"To" : new StringDataType()
                ,"Body" : new StringDataType()
                ,"Attachments" : new StringDataType()
                ,"Subject" : new StringDataType()
                ,"Debug" : new StringDataType()
                ,"Template" : new StringDataType()

            ],
            "mavenDependencies" : [
                                 "org.jbpm:jbpm-workitems-email:7.57.0.Final"

            ],
            "icon" : "defaultemailicon.png"

        ]

]

Then define the EmailWorkItemHandler within your src/main/resources/META-INF/kie-deployment-descriptor.xml where you need to specify the SMTP host, the Port and the Username / Password:

<work-item-handlers>
    <work-item-handler>
        <resolver>mvel</resolver>
        <identifier>new org.jbpm.process.workitem.email.EmailWorkItemHandler("smtp.gmail.com", "587", "email.user", "email.password", "true")</identifier>
        <parameters/>
        <name>Email</name>
    </work-item-handler>
</work-item-handlers>

With this configuration in place, you should be able to see the Mail Task in your Process Palette:

Within the properties of your Email Task define the attributes required to send the mail using either an expression or a Data Item:

Coding the Email Task using the Business Central

The above process can be much simplified by designing your assets using the Business Central.

Once that you have created your project, make sure that, within its settings, you have enabled the EMail Custom Task:

Once that you have enabled the Email Custom Task, you will be able to add Email Tasks from the Web Designer, as you can see from this snapshot:

If you want to check the source code of the EmailWorkItemHandler, you will find it on GitHub:

https://github.com/kiegroup/jbpm/blob/main/jbpm-workitems/jbpm-workitems-email/src/main/java/org/jbpm/process/workitem/email/EmailWorkItemHandler.java