我按照 Jersey 2.0 文档（https://jersey.java.net/documentation/latest/user-guide.html#json.moxy），修改 pom.xml，包含 jersey-media-moxy 工件，编译并安装。对于 Produces 和 Consumes 案例，我可以获得基本的 POJO 到 JSON 的映射工作。
但是，当我尝试使用一些具有复杂数据类型的 POJO 作为资源返回类型时，我得到了很多 Status 500 Internal Server Error 但没有任何服务器日志。这很烦人。有人知道这是一个错误还是我错过了配置中的某些内容？
顺便说一句，为了对 POJO 对象使用 Moxy 映射，POJO 需要有一个空参数构造函数。还有其他要求吗？
我遇到了同样的问题，发现了这个帖子：
作者实现了 ApplicationEventListener 来记录 Moxy 抛出的异常。这是我的实现（需要在您的应用程序中注册）：
public class ExceptionListener implements ApplicationEventListener {
@Override
public void onEvent(ApplicationEvent event) {
}
@Override
public RequestEventListener onRequest(RequestEvent requestEvent) {
return new ExceptionRequestEventListener();
}
public static class ExceptionRequestEventListener implements RequestEventListener{
private final Logger logger;
public ExceptionRequestEventListener(){
logger = Logger.getLogger(getClass());
}
@Override
public void onEvent(RequestEvent event) {
switch (event.getType()){
case ON_EXCEPTION:
Throwable t = event.getException();
logger.error("Found exception for requestType: "+event.getType(), t);
}
}
}
}
可以在以下链接中找到演示如何集成EclipseLink MOXy的官方Jersey示例：
在哪里可以找到内部服务器错误的堆栈跟踪取决于您的设置，您能否提供有关您的其他信息？
使用上面的示例，如果我从类中删除默认构造函数，org.glassfish.jersey.examples.jsonmoxy.TestBean我将在运行时得到以下异常mvn test。其中一个是好的，另一个是坏的。我将跟进泽西岛的领导，以找出正确的行为。
坏异常
testGet(org.glassfish.jersey.examples.jsonmoxy.JsonResourceTest) Time elapsed: 0.507 sec <<< ERROR!
javax.ws.rs.InternalServerErrorException: HTTP 500 Internal Server Error
at org.glassfish.jersey.client.JerseyInvocation.convertToException(JerseyInvocation.java:904)
at org.glassfish.jersey.client.JerseyInvocation.translate(JerseyInvocation.java:749)
at org.glassfish.jersey.client.JerseyInvocation.access$500(JerseyInvocation.java:88)
at org.glassfish.jersey.client.JerseyInvocation$2.call(JerseyInvocation.java:650)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:426)
at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:646)
at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:375)
at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:275)
at org.glassfish.jersey.examples.jsonmoxy.JsonResourceTest.testGet(JsonResourceTest.java:76)
好例外
roundTripTest(org.glassfish.jersey.examples.jsonmoxy.JsonResourceTest) Time elapsed: 0.048 sec <<< ERROR!
javax.ws.rs.WebApplicationException: HTTP 500 Internal Server Error
at org.eclipse.persistence.exceptions.JAXBException.factoryMethodOrConstructorRequired(JAXBException.java:144)
at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.finalizeProperties(AnnotationsProcessor.java:896)
at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.processClassesAndProperties(AnnotationsProcessor.java:282)
at org.eclipse.persistence.jaxb.compiler.Generator.<init>(Generator.java:150)
at org.eclipse.persistence.jaxb.JAXBContext$TypeMappingInfoInput.createContextState(JAXBContext.java:1017)
at org.eclipse.persistence.jaxb.JAXBContext.<init>(JAXBContext.java:174)
at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:165)
at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:152)
at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:112)
at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:102)
at org.eclipse.persistence.jaxb.rs.MOXyJsonProvider.getJAXBContext(MOXyJsonProvider.java:302)
at org.eclipse.persistence.jaxb.rs.MOXyJsonProvider.writeTo(MOXyJsonProvider.java:787)
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo(WriterInterceptorExecutor.java:194)
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:139)
at org.glassfish.jersey.filter.LoggingFilter.aroundWriteTo(LoggingFilter.java:268)
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:139)
at org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1005)
at org.glassfish.jersey.client.ClientRequest.writeEntity(ClientRequest.java:430)
at org.glassfish.jersey.client.HttpUrlConnector._apply(HttpUrlConnector.java:290)
at org.glassfish.jersey.client.HttpUrlConnector.apply(HttpUrlConnector.java:203)
at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:215)
at org.glassfish.jersey.client.JerseyInvocation$2.call(JerseyInvocation.java:650)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:426)
at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:646)
at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:402)
at org.glassfish.jersey.client.JerseyInvocation$Builder.post(JerseyInvocation.java:305)
at org.glassfish.jersey.examples.jsonmoxy.JsonResourceTest.roundTripTest(JsonResourceTest.java:84)
更新
从 EclipseLink 2.5.1 开始，您可以使用MOXyJsonProvider独立版本来测试您的模型。
import java.lang.reflect.Field;
import java.util.*;
import org.eclipse.persistence.jaxb.rs.MOXyJsonProvider;
public class Demo {
private List<Foo> foos;
public static void main(String[] args) throws Exception {
MOXyJsonProvider moxyJsonProvider = new MOXyJsonProvider();
Field field = Demo.class.getDeclaredField("foos");
List<Foo> foos = new ArrayList<Foo>(1);
Foo foo = new Foo();
foo.setBar("Hello World");
foos.add(foo);
moxyJsonProvider.writeTo(foos, field.getType(), field.getGenericType(), null, null, null, System.out);
}
}