Mail : Could not parse BPMN process

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Just had the same issue and found the solution for those, who use spring-boot starter and initiate camunda spring beans manually:

POM

   ...
    <dependency>
        <groupId>org.camunda.bpm</groupId>
        <artifactId>camunda-engine-plugin-connect</artifactId>
    </dependency>
    <dependency>
        <groupId>org.camunda.connect</groupId>
        <artifactId>camunda-connect-core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.camunda.bpm.extension</groupId>
        <artifactId>camunda-bpm-mail-core</artifactId>
        <version>1.3.0</version>
    </dependency>
   ...

Bean configuration:

@Bean
fun engineConfiguration(
    @Value("classpath:/processes/*.bpmn") deploymentResources: Array<Resource>
): SpringProcessEngineConfiguration {
     val configuration = SpringProcessEngineConfiguration()
     configuration.processEngineName = "engine"
     configuration.databaseSchemaUpdate = "true"
     configuration.isJobExecutorActivate = false
     configuration.dataSource = dataSource
     configuration.transactionManager = DataSourceTransactionManager(dataSource)
     configuration.deploymentResources = deploymentResources
     configuration.processEnginePlugins.add(ConnectProcessEnginePlugin()) // this one is important
     return configuration
}
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