在neo4j服务器扩展中使用JSON [英] Consuming JSON in neo4j server extension
本文介绍了在neo4j服务器扩展中使用JSON的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在构建Neo4j(2.2.2)非托管扩展，当我发布带有正确格式的JSON正文和Content-Type:application/json标头的请求时，我不知道为什么以下方法抛出415: unsupported media type.
@POST
@Path("/create")
@Consumes(MediaType.APPLICATION_JSON)
public Response createFoo(FooBar input) {
//not relevant
}
这是我要将JSON映射到的FooBar类:
@XmlRootElement
public class FooBar implements Serializable {
String title;
public FooBar(){}
}
这是我的日志中的消息:
`SEVERE: A message body reader for Java class org.mycompany.myproject.FooBar, and Java type class
org.mycompany.myproject.FooBar, and MIME media type application/json was not found.
The registered message body readers compatible with the MIME media type are:
** ->
com.sun.jersey.core.impl.provider.entity.FormProvider
com.sun.jersey.core.impl.provider.entity.StringProvider
com.sun.jersey.core.impl.provider.entity.ByteArrayProvider
com.sun.jersey.core.impl.provider.entity.FileProvider
com.sun.jersey.core.impl.provider.entity.InputStreamProvider
com.sun.jersey.core.impl.provider.entity.DataSourceProvider
com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General
com.sun.jersey.core.impl.provider.entity.ReaderProvider
com.sun.jersey.core.impl.provider.entity.DocumentProvider
com.sun.jersey.core.impl.provider.entity.SourceProvider$StreamSourceReader
....
在查看了类似问题的其他答案之后，我包括了适当版本的jersey-json，并确认它已包含在我的jar中.
这是我的pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.mycompany</groupId>
<artifactId>myproject</artifactId>
<version>1.0</version>
<dependencies>
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>javax.ws.rs-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j</artifactId>
<version>2.2.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.neo4j.test</groupId>
<artifactId>neo4j-harness</artifactId>
<version>2.2.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-kernel</artifactId>
<version>2.2.2</version>
<type>test-jar</type>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-io</artifactId>
<version>2.2.2</version>
<type>test-jar</type>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.neo4j.app</groupId>
<artifactId>neo4j-server</artifactId>
<version>2.2.2</version>
</dependency>
<dependency>
<groupId>org.neo4j.app</groupId>
<artifactId>neo4j-server</artifactId>
<version>2.2.2</version>
<type>test-jar</type>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>server-api</artifactId>
<version>2.2.2</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-all</artifactId>
<version>1.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
<version>2.13</version>
</dependency>
<dependency>
<groupId>com.github.javafaker</groupId>
<artifactId>javafaker</artifactId>
<version>0.5</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
<version>2.13</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-json</artifactId>
<version>1.18.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.4</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifest>
<mainClass>org.mycompany.myproject.mymainclassg</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
</plugins>
</build>
注意:Neo4j 2.2.2运行Jersey 1.18.1
更新:在@StefanArmbruster的建议下，我尝试将jersey-media-json-jackson添加到构建中，无论是否包含jersey-json依赖关系，并且仍然存在相同的问题
解决方案
直接与Jackson的JAX-RS提供程序并用通常会更简单:
https://github.com/FasterXML/jackson-jaxrs-providers
(用于JSON，还用于XML，Smile或CBOR)
仅通过Maven依赖关系包括提供者jar就足够了(jar具有META-INF/services自动注册元数据)；它确实依赖于Jackson 2.x(jackson-databind)，您可能还想添加一个显式依赖项.
I'm building a Neo4j (2.2.2) unmanaged extension and I can't figure out why the following method is throwing 415: unsupported media type when I post requests with properly-formatted JSON bodies and Content-Type:application/json headers.
@POST
@Path("/create")
@Consumes(MediaType.APPLICATION_JSON)
public Response createFoo(FooBar input) {
//not relevant
}
This is the FooBar class I want the JSON to be mapped to:
@XmlRootElement
public class FooBar implements Serializable {
String title;
public FooBar(){}
}
This is the message in my log:
`SEVERE: A message body reader for Java class org.mycompany.myproject.FooBar, and Java type class
org.mycompany.myproject.FooBar, and MIME media type application/json was not found.
The registered message body readers compatible with the MIME media type are:
** ->
com.sun.jersey.core.impl.provider.entity.FormProvider
com.sun.jersey.core.impl.provider.entity.StringProvider
com.sun.jersey.core.impl.provider.entity.ByteArrayProvider
com.sun.jersey.core.impl.provider.entity.FileProvider
com.sun.jersey.core.impl.provider.entity.InputStreamProvider
com.sun.jersey.core.impl.provider.entity.DataSourceProvider
com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General
com.sun.jersey.core.impl.provider.entity.ReaderProvider
com.sun.jersey.core.impl.provider.entity.DocumentProvider
com.sun.jersey.core.impl.provider.entity.SourceProvider$StreamSourceReader
....
After looking at other SO answers to similar questions, I have included the appropriate version of jersey-json and confirmed that it is being included in my jar.
This is my pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.mycompany</groupId>
<artifactId>myproject</artifactId>
<version>1.0</version>
<dependencies>
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>javax.ws.rs-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j</artifactId>
<version>2.2.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.neo4j.test</groupId>
<artifactId>neo4j-harness</artifactId>
<version>2.2.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-kernel</artifactId>
<version>2.2.2</version>
<type>test-jar</type>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-io</artifactId>
<version>2.2.2</version>
<type>test-jar</type>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.neo4j.app</groupId>
<artifactId>neo4j-server</artifactId>
<version>2.2.2</version>
</dependency>
<dependency>
<groupId>org.neo4j.app</groupId>
<artifactId>neo4j-server</artifactId>
<version>2.2.2</version>
<type>test-jar</type>
</dependency>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>server-api</artifactId>
<version>2.2.2</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-all</artifactId>
<version>1.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
<version>2.13</version>
</dependency>
<dependency>
<groupId>com.github.javafaker</groupId>
<artifactId>javafaker</artifactId>
<version>0.5</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
<version>2.13</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-json</artifactId>
<version>1.18.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.4</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifest>
<mainClass>org.mycompany.myproject.mymainclassg</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
</plugins>
</build>
Note: Neo4j 2.2.2 runs Jersey 1.18.1
Update: At @StefanArmbruster's suggestion, I attempted adding jersey-media-json-jackson to the build, both with and without the jersey-json dependency, and am still having the same problem
解决方案
Instead of messing with Jersey's bundling, it is often simpler to simply directly include Jackson JAX-RS provider:
https://github.com/FasterXML/jackson-jaxrs-providers
(for JSON, but also for XML, Smile or CBOR)
Simply including the provider jar via Maven dependency should be enough (jar has META-INF/services auto-registration metadata); it does depend on Jackson 2.x (jackson-databind), which you may want to add an explicit dependency as well.
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