Chapter 184. JSon GSon DataFormat Available as of Camel version 2.10 Gson is a Data Format which uses the Gson Library from("activemq:My.Queue"). marshal().json(JsonLibrary.Gson). to("mqseries:Another.Queue"); 184.1. Gson Options The JSon GSon dataformat supports 19 options, which are listed below. Name Default Java Type Description objectMapper String Lookup and use the existing ObjectMapper with the given id when using Jackson. useDefaultObjectMapper true Boolean Whether to lookup and use default Jackson ObjectMapper from the registry. prettyPrint false Boolean To enable pretty printing output nicely formatted. Is by default false. library XStream JsonLibrary Which json library to use. unmarshalTypeName String Class name of the java type to use when unarmshalling jsonView Class When marshalling a POJO to JSON you might want to exclude certain fields from the JSON output. With Jackson you can use JSON views to accomplish this. This option is to refer to the class which has JsonView annotations include String If you want to marshal a pojo to JSON, and the pojo has some fields with null values. And you want to skip these null values, you can set this option to NON_NULL allowJmsType false Boolean Used for JMS users to allow the JMSType header from the JMS spec to specify a FQN classname to use to unmarshal to. collectionTypeName String Refers to a custom collection type to lookup in the registry to use. This option should rarely be used, but allows to use different collection types than java.util.Collection based as default. useList false Boolean To unarmshal to a List of Map or a List of Pojo. enableJaxbAnnotationModule false Boolean Whether to enable the JAXB annotations module when using jackson. When enabled then JAXB annotations can be used by Jackson. moduleClassNames String To use custom Jackson modules com.fasterxml.jackson.databind.Module specified as a String with FQN class names. Multiple classes can be separated by comma. moduleRefs String To use custom Jackson modules referred from the Camel registry. Multiple modules can be separated by comma. enableFeatures String Set of features to enable on the Jackson com.fasterxml.jackson.databind.ObjectMapper. The features should be a name that matches a enum from com.fasterxml.jackson.databind.SerializationFeature, com.fasterxml.jackson.databind.DeserializationFeature, or com.fasterxml.jackson.databind.MapperFeature Multiple features can be separated by comma disableFeatures String Set of features to disable on the Jackson com.fasterxml.jackson.databind.ObjectMapper. The features should be a name that matches a enum from com.fasterxml.jackson.databind.SerializationFeature, com.fasterxml.jackson.databind.DeserializationFeature, or com.fasterxml.jackson.databind.MapperFeature Multiple features can be separated by comma permissions String Adds permissions that controls which Java packages and classes XStream is allowed to use during unmarshal from xml/json to Java beans. A permission must be configured either here or globally using a JVM system property. The permission can be specified in a syntax where a plus sign is allow, and minus sign is deny. Wildcards is supported by using . as prefix. For example to allow com.foo and all subpackages then specfy com.foo.. Multiple permissions can be configured separated by comma, such as com.foo.,-com.foo.bar.MySecretBean. The following default permission is always included: -,java.lang.,java.util. unless its overridden by specifying a JVM system property with they key org.apache.camel.xstream.permissions. allowUnmarshallType false Boolean If enabled then Jackson is allowed to attempt to use the CamelJacksonUnmarshalType header during the unmarshalling. This should only be enabled when desired to be used. timezone String If set then Jackson will use the Timezone when marshalling/unmarshalling. This option will have no effect on the others Json DataFormat, like gson, fastjson and xstream. contentTypeHeader false Boolean Whether the data format should set the Content-Type header with the type from the data format if the data format is capable of doing so. For example application/xml for data formats marshalling to XML, or application/json for data formats marshalling to JSon etc. 184.2. Spring Boot Auto-Configuration The component supports 20 options, which are listed below. Name Description Default Type camel.dataformat.json-gson.allow-jms-type Used for JMS users to allow the JMSType header from the JMS spec to specify a FQN classname to use to unmarshal to. false Boolean camel.dataformat.json-gson.allow-unmarshall-type If enabled then Jackson is allowed to attempt to use the CamelJacksonUnmarshalType header during the unmarshalling. This should only be enabled when desired to be used. false Boolean camel.dataformat.json-gson.collection-type-name Refers to a custom collection type to lookup in the registry to use. This option should rarely be used, but allows to use different collection types than java.util.Collection based as default. String camel.dataformat.json-gson.content-type-header Whether the data format should set the Content-Type header with the type from the data format if the data format is capable of doing so. For example application/xml for data formats marshalling to XML, or application/json for data formats marshalling to JSon etc. false Boolean camel.dataformat.json-gson.disable-features Set of features to disable on the Jackson com.fasterxml.jackson.databind.ObjectMapper. The features should be a name that matches a enum from com.fasterxml.jackson.databind.SerializationFeature, com.fasterxml.jackson.databind.DeserializationFeature, or com.fasterxml.jackson.databind.MapperFeature Multiple features can be separated by comma String camel.dataformat.json-gson.enable-features Set of features to enable on the Jackson com.fasterxml.jackson.databind.ObjectMapper. The features should be a name that matches a enum from com.fasterxml.jackson.databind.SerializationFeature, com.fasterxml.jackson.databind.DeserializationFeature, or com.fasterxml.jackson.databind.MapperFeature Multiple features can be separated by comma String camel.dataformat.json-gson.enable-jaxb-annotation-module Whether to enable the JAXB annotations module when using jackson. When enabled then JAXB annotations can be used by Jackson. false Boolean camel.dataformat.json-gson.enabled Enable json-gson dataformat true Boolean camel.dataformat.json-gson.include If you want to marshal a pojo to JSON, and the pojo has some fields with null values. And you want to skip these null values, you can set this option to NON_NULL String camel.dataformat.json-gson.json-view When marshalling a POJO to JSON you might want to exclude certain fields from the JSON output. With Jackson you can use JSON views to accomplish this. This option is to refer to the class which has JsonView annotations Class camel.dataformat.json-gson.library Which json library to use. JsonLibrary camel.dataformat.json-gson.module-class-names To use custom Jackson modules com.fasterxml.jackson.databind.Module specified as a String with FQN class names. Multiple classes can be separated by comma. String camel.dataformat.json-gson.module-refs To use custom Jackson modules referred from the Camel registry. Multiple modules can be separated by comma. String camel.dataformat.json-gson.object-mapper Lookup and use the existing ObjectMapper with the given id when using Jackson. String camel.dataformat.json-gson.permissions Adds permissions that controls which Java packages and classes XStream is allowed to use during unmarshal from xml/json to Java beans. A permission must be configured either here or globally using a JVM system property. The permission can be specified in a syntax where a plus sign is allow, and minus sign is deny. Wildcards is supported by using . as prefix. For example to allow com.foo and all subpackages then specfy com.foo.. Multiple permissions can be configured separated by comma, such as com.foo.,-com.foo.bar.MySecretBean. The following default permission is always included: -,java.lang.,java.util. unless its overridden by specifying a JVM system property with they key org.apache.camel.xstream.permissions. String camel.dataformat.json-gson.pretty-print To enable pretty printing output nicely formatted. Is by default false. false Boolean camel.dataformat.json-gson.timezone If set then Jackson will use the Timezone when marshalling/unmarshalling. This option will have no effect on the others Json DataFormat, like gson, fastjson and xstream. String camel.dataformat.json-gson.unmarshal-type-name Class name of the java type to use when unarmshalling String camel.dataformat.json-gson.use-default-object-mapper Whether to lookup and use default Jackson ObjectMapper from the registry. true Boolean camel.dataformat.json-gson.use-list To unarmshal to a List of Map or a List of Pojo. false Boolean 184.3. Dependencies To use Gson in your camel routes you need to add the dependency on camel-gson which implements this data format. If you use maven you could just add the following to your pom.xml, substituting the version number for the latest & greatest release (see the download page for the latest versions). <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-gson</artifactId> <version>x.x.x</version> <!-- use the same version as your Camel core version --> </dependency>

Commands:
from("activemq:My.Queue"). marshal().json(JsonLibrary.Gson). to("mqseries:Another.Queue");
<dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-gson</artifactId> <version>x.x.x</version> <!-- use the same version as your Camel core version --> </dependency>