使用Jersey和Jackson序列化（延遲加載）實體

我正在使用Jersey-Spring4作爲我的REST API。這是相關的pom.xml第一節有：使用Jersey和Jackson序列化（延遲加載）實體

<properties> 
     <jersey.version>2.25.1</jersey.version> 
     <guava.version>19.0</guava.version> 
     <jackson.version>2.25.1</jackson.version> 
     <slf4j.version>1.7.12</slf4j.version> 
     <logback.version>1.1.3</logback.version> 
     <antisamy.version>1.5.3</antisamy.version> 
     <spring.version>4.3.7.RELEASE</spring.version> 
     <junit.version>4.12</junit.version> 
    </properties> 

    <dependencies> 
     <dependency> 
      <groupId>com.openkm</groupId> 
      <artifactId>sdk4j</artifactId> 
      <version>2.3</version> 
     </dependency> 

     <!-- Servlet --> 
     <dependency> 
      <groupId>javax.servlet</groupId> 
      <artifactId>javax.servlet-api</artifactId> 
      <version>3.1.0</version> 
      <scope>provided</scope> 
     </dependency> 

     <!-- JAX-RS --> 
     <dependency> 
      <groupId>javax.ws.rs</groupId> 
      <artifactId>javax.ws.rs-api</artifactId> 
      <version>2.0.1</version> 
      <scope>compile</scope> 
     </dependency> 

     <!-- Jersey --> 
     <dependency> 
      <groupId>org.glassfish.jersey.containers</groupId> 
      <artifactId>jersey-container-servlet</artifactId> 
      <version>${jersey.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.glassfish.jersey.core</groupId> 
      <artifactId>jersey-server</artifactId> 
      <version>${jersey.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.glassfish.jersey.media</groupId> 
      <artifactId>jersey-media-json-jackson</artifactId> 
      <version>${jersey.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.glassfish.jersey.media</groupId> 
      <artifactId>jersey-media-multipart</artifactId> 
      <version>${jersey.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.glassfish.jersey.ext</groupId> 
      <artifactId>jersey-bean-validation</artifactId> 
      <version>${jersey.version}</version> 
     </dependency> 

     <!-- 
Note: There is a bug of jersey-spring3 -> https://java.net/jira/browse/JERSEY-2038 
--> 
     <dependency> 
      <groupId>org.glassfish.jersey.ext</groupId> 
      <artifactId>jersey-spring3</artifactId> 
      <version>${jersey.version}</version> 
      <exclusions> 
       <exclusion> 
        <artifactId>spring-context</artifactId> 
        <groupId>org.springframework</groupId> 
       </exclusion> 
       <exclusion> 
        <artifactId>spring-beans</artifactId> 
        <groupId>org.springframework</groupId> 
       </exclusion> 
       <exclusion> 
        <artifactId>spring-core</artifactId> 
        <groupId>org.springframework</groupId> 
       </exclusion> 
       <exclusion> 
        <artifactId>spring-web</artifactId> 
        <groupId>org.springframework</groupId> 
       </exclusion> 
       <exclusion> 
        <artifactId>jersey-server</artifactId> 
        <groupId>org.glassfish.jersey.core</groupId> 
       </exclusion> 
       <exclusion> 
        <artifactId> 
         jersey-container-servlet-core 
        </artifactId> 
        <groupId>org.glassfish.jersey.containers</groupId> 
       </exclusion> 
       <exclusion> 
        <artifactId>hk2</artifactId> 
        <groupId>org.glassfish.hk2</groupId> 
       </exclusion> 
      </exclusions> 
     </dependency> 

     <!-- Spring --> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-context</artifactId> 
      <version>${spring.version}</version> 
      <exclusions> 
       <exclusion> 
        <groupId>commons-logging</groupId> 
        <artifactId>commons-logging</artifactId> 
       </exclusion> 
      </exclusions> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-beans</artifactId> 
      <version>${spring.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-web</artifactId> 
      <version>${spring.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-aop</artifactId> 
      <version>${spring.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-core</artifactId> 
      <version>${spring.version}</version> 
      <exclusions> 
       <exclusion> 
        <groupId>commons-logging</groupId> 
        <artifactId>commons-logging</artifactId> 
       </exclusion> 
      </exclusions> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-tx</artifactId> 
      <version>${spring.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-orm</artifactId> 
      <version>${spring.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework.data</groupId> 
      <artifactId>spring-data-jpa</artifactId> 
      <version>1.11.1.RELEASE</version> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-aspects</artifactId> 
      <version>4.3.5.RELEASE</version> 
     </dependency> 

     <!-- Google Guava --> 
     <dependency> 
      <groupId>com.google.guava</groupId> 
      <artifactId>guava</artifactId> 
      <version>${guava.version}</version> 
     </dependency> 
     <!-- logging --> 
     <dependency> 
      <groupId>org.slf4j</groupId> 
      <artifactId>slf4j-api</artifactId> 
      <version>${slf4j.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.slf4j</groupId> 
      <artifactId>jcl-over-slf4j</artifactId> 
      <version>${slf4j.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>ch.qos.logback</groupId> 
      <artifactId>logback-core</artifactId> 
      <version>${logback.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>ch.qos.logback</groupId> 
      <artifactId>logback-classic</artifactId> 
      <version>${logback.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.owasp.antisamy</groupId> 
      <artifactId>antisamy</artifactId> 
      <version>${antisamy.version}</version> 
     </dependency> 

     <!-- Apache HTTP Client --> 
     <dependency> 
      <groupId>org.apache.httpcomponents</groupId> 
      <artifactId>httpclient</artifactId> 
      <version>4.5.1</version> 
     </dependency> 
     <dependency> 
      <groupId>org.apache.httpcomponents</groupId> 
      <artifactId>fluent-hc</artifactId> 
      <version>4.5.1</version> 
     </dependency> 
     <dependency> 
      <groupId>org.apache.httpcomponents</groupId> 
      <artifactId>httpmime</artifactId> 
      <version>4.5.2</version> 
     </dependency> 

     <dependency> 
      <groupId>org.hibernate</groupId> 
      <artifactId>hibernate-core</artifactId> 
      <version>5.2.9.Final</version> 
     </dependency> 

     <dependency> 
      <groupId>org.hibernate.javax.persistence</groupId> 
      <artifactId>hibernate-jpa-2.1-api</artifactId> 
      <version>1.0.0.Final</version> 
     </dependency> 

     <dependency> 
      <groupId>org.hibernate</groupId> 
      <artifactId>hibernate-envers</artifactId> 
      <version>5.2.9.Final</version> 
     </dependency> 

     <dependency> 
      <groupId>com.fasterxml.jackson.datatype</groupId> 
      <artifactId>jackson-datatype-hibernate5</artifactId> 
      <version>2.8.4</version> 
     </dependency> 

     <dependency> 
      <groupId>org.postgresql</groupId> 
      <artifactId>postgresql</artifactId> 
      <version>42.0.0</version> 
     </dependency> 

     <dependency> 
      <groupId>javax.inject</groupId> 
      <artifactId>javax.inject</artifactId> 
      <version>1</version> 
     </dependency> 

     <!-- Test --> 
     <dependency> 
      <groupId>junit</groupId> 
      <artifactId>junit</artifactId> 
      <version>${junit.version}</version> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.hamcrest</groupId> 
      <artifactId>hamcrest-library</artifactId> 
      <version>1.3</version> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-test</artifactId> 
      <version>${spring.version}</version> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>commons-lang</groupId> 
      <artifactId>commons-lang</artifactId> 
      <version>2.6</version> 
     </dependency> 

     <!-- Swagger dependencies --> 
     <dependency> 
      <groupId>io.swagger</groupId> 
      <artifactId>swagger-jersey2-jaxrs</artifactId> 
      <scope>compile</scope> 
      <version>1.5.13</version> 
     </dependency> 

     <dependency> 
      <groupId>com.nimbusds</groupId> 
      <artifactId>nimbus-jose-jwt</artifactId> 
      <version>4.0</version> 
     </dependency> 

     <dependency> 
      <groupId>joda-time</groupId> 
      <artifactId>joda-time</artifactId> 
      <version>2.9.9</version> 
     </dependency> 

    </dependencies>

現在，我該如何配置項目：

@Configuration("appConfig") 
@ComponentScan(value = "com.nws.vedica", lazyInit = true) 
@PropertySource({"classpath:swagger.properties", "classpath:vedica.properties"}) 
@ApplicationPath("/api") 
@EnableJpaAuditing(auditorAwareRef="auditorProvider") 
public class VedicaConfig extends ResourceConfig { 

public VedicaConfig() { 
    packages("com.nws.vedica"); 
    property(ServletProperties.FILTER_FORWARD_ON_404, true); 
    register(MultiPartFeature.class); 
    register(JacksonFeature.class); 
//  register(MOXyJsonProvider.class); 
     register(ValidationFeature.class); 
     register(ValidationConfigurationContextResolver.class); 
     register(PropertySourcesPlaceholderConfigurer.class); 

    register(ApiListingResource.class); 
    register(SwaggerSerializers.class); 
} 

@Bean 
AuditorAware<String> auditorProvider() { 
    return new AuditorAware<String>() { 
     @Override 
     public String getCurrentAuditor() { 
      return "qwer"; 
     } 
    }; 
} 

@Bean 
public PersistenceExceptionTranslationPostProcessor exceptionTranslation() { 
    return new PersistenceExceptionTranslationPostProcessor(); 
} 
}

現在，我的大，惱人的，問題是，當我返回一個實體在它裏面有懶惰的實體我得到WARNING: com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: com.nws.vedica.model.entity.PartyKind["doc2"]->com.nws.vedica.model.entity.Document2["docType"]->com.nws.vedica.model.entity.DocType["validityRule"]->com.nws.vedica.model.entity.ValidityRule["validFrom"]) 異常。

歐凱，我經歷了許多文章和告訴我，我必須使用

<dependency> 
     <groupId>com.fasterxml.jackson.datatype</groupId> 
     <artifactId>jackson-datatype-hibernate5</artifactId> 
     <version>2.8.4</version> 
    </dependency>

包，使傑克遜初始化我的實體（這些都是FetchType.EAGER線程去了，所以我真的不知道爲什麼這是否發生）。

所以，當我添加jackson-datatype-hibernate5依賴，並註冊它的配置如下：

@Bean 
public Module datatypeHibernateModule() { 
    return new Hibernate5Module(); 
}

但我仍然得到同樣的異常。我的意見是，我需要不同的datatype-hibernate5休眠包的澤西島，但無法找到哪個。或以不同的方式註冊。

你能建議如何使這項工作？謝謝

來源

2017-06-20 greengold

它看起來不像你使用Spring Boot。作爲Spring bean的Module是隻能用於Spring Boot的東西。如果你想用Jersey配置Jackson，你應該使用ContextResolver，你可以在其中配置ObjectMapper。

@Provider 
public class ObjectMapperContextResolver implements ContextResolver<ObjectMapper> { 

    private final ObjectMapper mapper; 

    public ObjectMapperContextResolver() { 
     mapper = new ObjectMapper(); 
     mapper.registerModule(new Hibernate5Module()); 
    } 

    @Override 
    public ObjectMapper getContext(Class<?> type) { 
     return mapper; 
    } 
}

然後用球衣

註冊它

register(ObjectMapperContextResolver.class);

來源

2017-06-20 14:51:22

是的，這解決了這個問題，謝謝！ – greengold

通過這個昨天工作，今天，序列化失敗，同樣的錯誤。只要我有FetchType.LAZY我只有代理和Hibernate.initialize（）不起作用。但是我可以看到「實體已經實現了」或者這樣......這裏有什麼問題？它適用於當我設置渴望加載... – greengold

是的，我不是很確定。 –

使用Jersey和Jackson序列化（延遲加載）實體

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