骆驼和杰克逊依赖问题

Question

我遇到了最新版本的 Camel 和 REST DSL 路由的问题。完整代码可以从这里找到并运行：https : //github.com/mikevoxcap/nvisia-catalog-camel-service。当我尝试运行路由时出现异常，潜在原因如下：

Caused by: java.lang.NoSuchMethodError: com.fasterxml.jackson.databind.introspect.AnnotatedMember.getType()Lcom/fasterxml/jackson/databind/JavaType;
....
at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:926)
    at org.apache.camel.component.jackson.JacksonDataFormat.marshal(JacksonDataFormat.java:154)
    at org.apache.camel.processor.MarshalProcessor.process(MarshalProcessor.java:69)

我的问题是，我应该针对哪个版本的 Jackson 不再收到此异常。

我引入了以下依赖项：

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <spring.boot.version>1.3.5.RELEASE</spring.boot.version>
    <camel.version>2.17.1</camel.version>
    <java.version>1.8</java.version>
</properties>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>${spring.boot.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-spring-boot</artifactId>
        <version>${camel.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-jackson</artifactId>
        <version>${camel.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-servlet</artifactId>
        <version>${camel.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-swagger-java</artifactId>
        <version>${camel.version}</version>
    </dependency>

    <!-- Testing -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-test-spring</artifactId>
        <version>${camel.version}</version>
        <scope>test</scope>
    </dependency>   
</dependencies>

在对我收到的异常进行了一些搜索之后，有几个人在版本冲突方面遇到了这个问题。我注意到骆驼杰克逊库引入了 jackson-module-jaxb-annotations 2.7.2，但其余的 jackson 库是 2.6.6。我尝试排除 jackson-module-jaxb-annotations 2.7.2，然后直接包含 2.6.6，但这仍然导致异常。

我的路线比较简单：

  // Definition of the get catalog item endpoint
  rest("/catalogItem").
        // This is a GET method call for getting a catalog item by ID.
  get("{id}").
        // Description of what this method does
        description("Retrieve a catalog item by ID").
        // Define the output type that will be returned from this method
        outType(CatalogItem.class)
        // Define where the message is routed to as a URI. Here we use a
        // Spring Bean and define the bean method to invoke. Note that Camel
        // has converted the ID placeholder from the URL into a header
        // entry.
        .to("bean:catalogService?method=getCatalogItem(${header.id})");

我用作 JSON 类型的对象也非常简单：

public class CatalogItem {

   private int id;
   private double price;
   private String catalogItemType;
   private List<CatalogItemAttribute> attributes;

public class CatalogItemAttribute {

   private String attributeName;
   private String attributeValue;

Answer 1

虽然我没有从 Camel 找到任何官方消息，但一旦 Spring Boot 1.4 发布，这似乎会自行解决，因为它将转向支持 Jackson 2.7。与此同时，我更新了我的依赖项，如下所述。我为 spring-boot-starter-web、spring-boot-starter-actuator、camel-jackson 和 camel-swagger-java 依赖项添加了 jackson-annotations、jackson-core 和 jackson-databind 库的排除项。然后我用 2.7.2 指定了三个 jackson 依赖项。

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <exclusions>
            <exclusion>
                <artifactId>jackson-annotations</artifactId>
                <groupId>com.fasterxml.jackson.core</groupId>
            </exclusion>
            <exclusion>
                <artifactId>jackson-core</artifactId>
                <groupId>com.fasterxml.jackson.core</groupId>
            </exclusion>
            <exclusion>
                <artifactId>jackson-databind</artifactId>
                <groupId>com.fasterxml.jackson.core</groupId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
        <exclusions>
            <exclusion>
                <artifactId>jackson-databind</artifactId>
                <groupId>com.fasterxml.jackson.core</groupId>
            </exclusion>
        </exclusions>
    </dependency>

    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-spring-boot</artifactId>
        <version>${camel.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-jackson</artifactId>
        <version>${camel.version}</version>
        <exclusions>
            <exclusion>
                <artifactId>jackson-annotations</artifactId>
                <groupId>com.fasterxml.jackson.core</groupId>
            </exclusion>
            <exclusion>
                <artifactId>jackson-core</artifactId>
                <groupId>com.fasterxml.jackson.core</groupId>
            </exclusion>
            <exclusion>
                <artifactId>jackson-databind</artifactId>
                <groupId>com.fasterxml.jackson.core</groupId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-servlet</artifactId>
        <version>${camel.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-swagger-java</artifactId>
        <version>${camel.version}</version>
        <exclusions>
            <exclusion>
                <artifactId>jackson-annotations</artifactId>
                <groupId>com.fasterxml.jackson.core</groupId>
            </exclusion>
            <exclusion>
                <artifactId>jackson-core</artifactId>
                <groupId>com.fasterxml.jackson.core</groupId>
            </exclusion>
            <exclusion>
                <artifactId>jackson-databind</artifactId>
                <groupId>com.fasterxml.jackson.core</groupId>
            </exclusion>
        </exclusions>
    </dependency>

    <dependency>
        <artifactId>jackson-annotations</artifactId>
        <groupId>com.fasterxml.jackson.core</groupId>
        <version>2.7.2</version>
    </dependency>
    <dependency>
        <artifactId>jackson-core</artifactId>
        <groupId>com.fasterxml.jackson.core</groupId>
        <version>2.7.2</version>
    </dependency>
    <dependency>
        <artifactId>jackson-databind</artifactId>
        <groupId>com.fasterxml.jackson.core</groupId>
        <version>2.7.2</version>
    </dependency>

    <!-- Testing -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-test-spring</artifactId>
        <version>${camel.version}</version>
        <scope>test</scope>
    </dependency>   
</dependencies>