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Chapter 97. MapStruct
Since Camel 3.19
Only producer is supported.
The camel-mapstruct component is used for converting POJOs using MapStruct.
97.1. Dependencies
When using mapstruct with Red Hat build of Camel Spring Boot make sure to use the following Maven dependency to have support for auto configuration:
<dependency>
<groupId>org.apache.camel.springboot</groupId>
<artifactId>camel-mapstruct-starter</artifactId>
</dependency>97.2. URI format
mapstruct:className[?options]
Where className is the fully qualified class name of the POJO to convert to.
97.3. Configuring Options
Camel components are configured on two separate levels:
- component level
- endpoint level
97.3.1. Configuring Component Options
At the component level, you set general and shared configurations that are, then, inherited by the endpoints. It is the highest configuration level. For example, a component may have security settings, credentials for authentication, urls for network connection and so forth. Some components only have a few options, and others may have many. Because components typically have pre-configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all.
You can configure components using:
- the Component DSL.
- in a configuration file (application.properties, *.yaml files, etc).
- directly in the Java code.
97.3.2. Configuring Endpoint Options
You usually spend more time setting up endpoints because they have many options. These options help you customize what you want the endpoint to do. The options are also categorized into whether the endpoint is used as a consumer (from), as a producer (to), or both.
Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL and DataFormat DSL as a type safe way of configuring endpoints and data formats in Java.
A good practice when configuring options is to use Property Placeholders.
Property placeholders provide a few benefits:
- They help prevent using hardcoded urls, port numbers, sensitive information, and other settings.
- They allow externalizing the configuration from the code.
- They help the code to become more flexible and reusable.
The following two sections list all the options, firstly for the component followed by the endpoint.
97.4. Component Options
The MapStruct component supports 4 options, which are listed below.
| Name | Description | Default | Type |
|---|---|---|---|
| lazyStartProducer (producer) | Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. | false | boolean |
| mapperPackageName (producer) | Required Package name(s) where Camel should discover Mapstruct mapping classes. Multiple package names can be separated by comma. | String | |
| autowiredEnabled (advanced) | Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc. | true | boolean |
| mapStructConverter (advanced) | Autowired To use a custom MapStructConverter such as adapting to a special runtime. | MapStructMapperFinder |
97.5. Endpoint Options
The MapStruct endpoint is configured using URI syntax:
mapstruct:classNamewith the following path and query parameters:
97.5.1. Path Parameters (1 parameters)
| Name | Description | Default | Type |
|---|---|---|---|
| className (producer) | Required The fully qualified class name of the POJO that mapstruct should convert to (target). | String |
97.5.2. Query Parameters (2 parameters)
| Name | Description | Default | Type |
|---|---|---|---|
| mandatory (producer) | Whether there must exist a mapstruct converter to convert to the POJO. | true | boolean |
| lazyStartProducer (producer (advanced)) | Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. | false | boolean |
97.6. Setting up MapStruct
The camel-mapstruct component must be configured with one or more package names, for classpath scanning MapStruct Mapper classes. This is needed because the Mapper classes are to be used for converting POJOs with MapStruct.
For example, to set up two packages you can do as following:
MapstructComponent mc = context.getComponent("mapstruct", MapstructComponent.class);
mc.setMapperPackageName("com.foo.mapper,com.bar.mapper");
This can also be configured in application.properties:
camel.component.mapstruct.mapper-package-name = com.foo.mapper,com.bar.mapper
Camel will on startup scan these packages for classes which names ends with Mapper. These classes are then introspected to discover the mapping methods. These mapping methods are then registered into the Camel registry. This means that you can also use type converter to convert the POJOs with MapStruct, such as:
from("direct:foo")
.convertBodyTo(MyFooDto.class);
Where MyFooDto is a POJO that MapStruct is able to convert to/from.
97.7. Spring Boot Auto-Configuration
The component supports 5 options, which are listed below.
| Name | Description | Default | Type |
|---|---|---|---|
| camel.component.mapstruct.autowired-enabled | Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc. | true | Boolean |
| camel.component.mapstruct.enabled | Whether to enable auto configuration of the mapstruct component. This is enabled by default. | Boolean | |
| camel.component.mapstruct.lazy-start-producer | Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. | false | Boolean |
| camel.component.mapstruct.map-struct-converter | To use a custom MapStructConverter such as adapting to a special runtime. The option is a org.apache.camel.component.mapstruct.MapStructMapperFinder type. | MapStructMapperFinder | |
| camel.component.mapstruct.mapper-package-name | Package name(s) where Camel should discover Mapstruct mapping classes. Multiple package names can be separated by comma. | String |
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