我正在使用泽西岛 2.3
我的 WS 端点类：
@Path("/employees")
public class EmployeeWSEndpoint {
@Context
Request request;
@GET
@Path("/allEmployees")
@Produces(MediaType.APPLICATION_JSON)
public List<Employee> getAllEmployees() {
System.out.println("In EmployeeWSEndpoint.getAllEmployees()");
EmployeeService employeeService = new EmployeeServiceImpl();
return employeeService.getAllEmployees();
}
@GET
@Path("/allDept")
@Produces(MediaType.APPLICATION_JSON)
public List<String> getAllDept() {
System.out.println("In EmployeeWSEndpoint.getAllDept()");
List<String> deptNames = new ArrayList<>();
deptNames.add("CoE");
deptNames.add("iLabs");
return deptNames;
}
@GET
@Path("/allDeptPOJO")
@Produces(MediaType.APPLICATION_JSON)
public TempPOJO getAllDeptPOJO() {
System.out.println("In EmployeeWSEndpoint.getAllDeptPOJO");
TempPOJO tempPOJO = new TempPOJO();
return tempPOJO;
}
}
员工职位 ：
public class Employee {
private int id;
private String firstName;
private String middleName;
private String lastName;
private Date dob;
private int deptId;
public Employee() {
}
public Employee(String firstName, String middleName, String lastName,
Date dob, int deptId) {
this.firstName = firstName;
this.middleName = middleName;
this.lastName = lastName;
this.dob = dob;
this.deptId = deptId;
}
public Employee(int id, String firstName, String middleName,
String lastName, Date dob, int deptId) {
this.id = id;
this.firstName = firstName;
this.middleName = middleName;
this.lastName = lastName;
this.dob = dob;
this.deptId = deptId;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getMiddleName() {
return middleName;
}
public void setMiddleName(String middleName) {
this.middleName = middleName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public Date getDob() {
return dob;
}
public void setDob(Date dob) {
this.dob = dob;
}
public int getDeptId() {
return deptId;
}
public void setDeptId(int deptId) {
this.deptId = deptId;
}
@Override
public String toString() {
return firstName + " " + middleName + " " + " " + lastName;
}
}
临时POJO ：
public class TempPOJO {
private List<String> deptNames;
public List<String> getDeptNames() {
deptNames = new ArrayList<>();
deptNames.add("CoE");
deptNames.add("iLabs");
return deptNames;
}
public void setDeptNames(List<String> deptNames) {
this.deptNames = deptNames;
}
}
列出不同方法的输出：
所有员工
[{"deptId":1,"dob":"1978-06-19","firstName":"Garfield","id":0,"lastName":"Arbuckle","middleName":"John"},{"deptId":1,"dob":"1946-07-07","firstName":"John","id":0,"lastName":"Rambo","middleName":"R"}]
/全部部门
In EmployeeWSEndpoint.getAllDept()
Oct 01, 2013 3:31:08 PM org.glassfish.jersey.server.ServerRuntime$Responder mapException
WARNING: WebApplicationException cause:
javax.xml.bind.MarshalException
- with linked exception:
[Exception [EclipseLink-25003] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.XMLMarshalException
Exception Description: An error occurred marshalling the object
Internal Exception: Exception [EclipseLink-25007] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.XMLMarshalException
Exception Description: A descriptor for class java.lang.String was not found in the project. For JAXB, if the JAXBContext was bootstrapped using TypeMappingInfo[] you must call a marshal method that accepts TypeMappingInfo as an input parameter.]
at org.eclipse.persistence.jaxb.JAXBMarshaller.marshal(JAXBMarshaller.java:403)
at org.eclipse.persistence.jaxb.rs.MOXyJsonProvider.writeTo(MOXyJsonProvider.java:808)
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.invokeWriteTo(WriterInterceptorExecutor.java:243)
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo(WriterInterceptorExecutor.java:230)
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:149)
at org.glassfish.jersey.server.internal.JsonWithPaddingInterceptor.aroundWriteTo(JsonWithPaddingInterceptor.java:103)
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:149)
at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:88)
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:149)
at org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1139)
at org.glassfish.jersey.server.ServerRuntime$Responder.writeResponse(ServerRuntime.java:562)
at org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:357)
at org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:347)
at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:258)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:318)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:235)
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:983)
at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:359)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:372)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:335)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:218)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: Exception [EclipseLink-25003] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.XMLMarshalException
Exception Description: An error occurred marshalling the object
Internal Exception: Exception [EclipseLink-25007] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.XMLMarshalException
Exception Description: A descriptor for class java.lang.String was not found in the project. For JAXB, if the JAXBContext was bootstrapped using TypeMappingInfo[] you must call a marshal method that accepts TypeMappingInfo as an input parameter.
at org.eclipse.persistence.exceptions.XMLMarshalException.marshalException(XMLMarshalException.java:97)
at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:911)
at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:848)
at org.eclipse.persistence.jaxb.JAXBMarshaller.marshal(JAXBMarshaller.java:401)
... 41 more
Caused by: Exception [EclipseLink-25007] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.XMLMarshalException
Exception Description: A descriptor for class java.lang.String was not found in the project. For JAXB, if the JAXBContext was bootstrapped using TypeMappingInfo[] you must call a marshal method that accepts TypeMappingInfo as an input parameter.
at org.eclipse.persistence.exceptions.XMLMarshalException.descriptorNotFoundInProject(XMLMarshalException.java:139)
at org.eclipse.persistence.internal.oxm.Context$ContextState.getSession(Context.java:143)
at org.eclipse.persistence.oxm.XMLContext$XMLContextState.getSession(XMLContext.java:787)
at org.eclipse.persistence.oxm.XMLContext$XMLContextState.getSession(XMLContext.java:1)
at org.eclipse.persistence.internal.oxm.Context.getSession(Context.java:451)
at org.eclipse.persistence.oxm.XMLContext.getSession(XMLContext.java:356)
at org.eclipse.persistence.oxm.XMLContext.getSession(XMLContext.java:1)
at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:568)
at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:1096)
at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:869)
... 43 more
/全部部门
{"deptNames":["CoE","iLabs"]}
我有一些疑问：
- 我想从泽西岛 2.3 开始，注释"XmlRootElement"对于 POJO 不是必需的 - 我还没有这样做，但调用有效。请确认
- 如果 pojo(员工(的列表或具有列表的 pojo，响应是正确的，但对于列表、映射等，它失败了(基本上，对于 Java 类型( - 为什么会这样？如果它适用于员工，为什么它不适用于 Java 类型？是否需要编写 XmlAdapter？
注意：在大多数情况下，我希望以JSON格式响应。
修改网页.xml使用杰克逊：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>Jersey</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>Jersey REST Service</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>com.ws.jaxrs.jersey</param-value>
</init-param>
<init-param>
<param-name>jersey.config.disableMoxyJson.server</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>com.ws.jaxrs.jersey;org.codehaus.jackson.jaxrs</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey REST Service</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
我得到了以下异常：
In EmployeeWSEndpoint.getAllDept()
Nov 07, 2013 10:04:12 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [Jersey REST Service] in context with path [/Jersey] threw exception [org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyWriter not found for media type=application/json, type=class java.util.ArrayList, genericType=java.util.List<java.lang.String>.] with root cause
org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyWriter not found for media type=application/json, type=class java.util.ArrayList, genericType=java.util.List<java.lang.String>.
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo(WriterInterceptorExecutor.java:227)
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:149)
at org.glassfish.jersey.server.internal.JsonWithPaddingInterceptor.aroundWriteTo(JsonWithPaddingInterceptor.java:103)
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:149)
at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:88)
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:149)
at org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1139)
at org.glassfish.jersey.server.ServerRuntime$Responder.writeResponse(ServerRuntime.java:562)
at org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:357)
at org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:347)
at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:258)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:318)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:235)
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:983)
at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:359)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:372)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:335)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:218)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
杰克逊是目前对我来说最好的解决方案。
要使用 Jackson 作为 JSON 提供程序，您需要将jersey-media-json-jackson模块添加到pom.xml文件中：
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
<version>2.7</version>
</dependency>
注意：自动发现功能不起作用。
启用杰克逊 JSON 功能的构建客户端：
final Client client = ClientBuilder.newBuilder()
.register(JacksonFeature.class)
.build();
创建启用了 Jackson JSON 功能的 JAX-RS 服务器应用程序：
final Application application = new ResourceConfig()
.packages("my.rest.package")
.register(JacksonFeature.class);
另请查看官方泽西岛 json-jackson 示例。
使用不同的 JSON 提供程序
我不知道为什么 jersey startet 采用 MOXy 作为他们的默认 JSON 提供程序，但这显然是一个坏主意。
您(和我 - 以及其他人(遇到的问题是 MOXy beeing 无法映射简单 Java 类型(如字符串(的集合的结果 - 恕我直言，这简直是荒谬的。其他提供商(如杰克逊(没有这个问题，因此切换肯定会有所帮助。
这是我所做的：
-
告诉泽西岛不要使用MOXy。将此添加到您的网络.xml：
<init-param> <param-name>jersey.config.disableMoxyJson.server</param-name> <param-value>true</param-value> </init-param> -
将杰克逊添加到您的pom中。像这样的事情可以：
<dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-jaxrs</artifactId> <version>1.9.12</version> </dependency> -
告诉球衣扫描杰克逊杰克逊包裹。它将查找(并使用(杰克逊提供的 json 提供程序：
<init-param> <param-name>jersey.config.server.provider.packages</param-name> <param-value>com.example.your.package;org.codehaus.jackson.jaxrs</param-value> </init-param>
注意：我是 EclipseLink JAXB (MOXy( 的负责人，也是 JAXB (JSR-222( 专家组的成员。
您遇到的异常是由于MOXy MOXyJsonProvider中的错误。 MOXyJsonProvider是 JAX-RS 接口MessageBodyReader/MessageBodyWriter 的实现。 我已将isWriteable方法更改为返回 false，以便List<String>返回 false，以便另一个提供程序可以处理它。
我还打开了以下增强请求，以将此支持添加到 MOXy：
- http://bugs.eclipse.org/417725
您可以使用 RestEasy 作为 JAX-RS 实现
GlassFish4使用Jersey/MOXy作为JAX-RS的实现。他们在将简单 Java 类型(如字符串(的集合映射到 JSON 时遇到问题 - https://bugs.eclipse.org/bugs/show_bug.cgi?id=417723
WildFly 和 JBoss 使用 RestEasy/Jackson 作为 JAX-RS 的实现，映射没有问题。
你可以在任何Java应用程序服务器中使用RestEasy而不是Jersey，例如WildFly(JBoss(，GlassFish或Tomcat。
只需替换：
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
跟：
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-servlet-initializer</artifactId>
<version>3.0.7.Final</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>3.0.7.Final</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jackson-provider</artifactId>
<version>3.0.7.Final</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>3.0.7.Final</version>
<scope>compile</scope>
</dependency>
它对我有用。
最好的问候从卢布林在波兰:)
我在返回List<String>对象时遇到了同样的问题。我把它包装在一个RestStringList类中，这很有效。如果我们有更多的事情要做，我可能会转向杰克逊。
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
public class RestStringList implements Serializable {
private static final long serialVersionUID = 1L;
private List<String> stringList = null;
public RestStringList() {
this.stringList = new ArrayList<String>();
}
public void setStringList(List<String> stringList) {
this.stringList = new ArrayList<String>(stringList);
}
public List<String> getStringList() {
return stringList;
}
public String toString() {
return "{ strings=" + stringList + " }";
}
}