我正在尝试使用Jax-rs和Tomcat 9.XX服务器的jersey实现在Java中开发一个简单的Restful API。该应用程序以XML格式生成数据。
但是当调用api资源时，我从服务器收到以下异常：
Type Exception Report
Message: Servlet.init() for servlet [ApplicationConfig] threw exception
Description: The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception:
javax.servlet.ServletException: Servlet.init() for servlet [ApplicationConfig] threw exception
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:748)
Root Cause:
java.lang.IllegalStateException: The resource configuration is not modifiable in this context.
org.glassfish.jersey.server.ResourceConfig$ImmutableState.register(ResourceConfig.java:246)
org.glassfish.jersey.server.ResourceConfig$ImmutableState.register(ResourceConfig.java:193)
org.glassfish.jersey.server.ResourceConfig.register(ResourceConfig.java:426)
org.glassfish.jersey.servlet.WebComponent.<init>(WebComponent.java:306)
org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:154)
org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:346)
javax.servlet.GenericServlet.init(GenericServlet.java:158)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:748)
我无法弄清楚是什么原因导致了此问题。
应用程序的基本模型能够正确输出xml数据，但是当我尝试实现HATEOS模型以在数据中包括链接时，服务器已开始引发异常。
球衣应用配置：
import java.util.HashMap;
import java.util.Map;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;
@ApplicationPath(value = "restapi")
public class ApplicationConfig extends Application {
@Override
public Map<String, Object> getProperties() {
Map<String, Object> properties = new HashMap<>();
properties.put("jersey.config.server.provider.packages", "restresources");
return properties;
}
}
其他资源：
@Path(value = "poketype")
public class PokemonTypeRestResource {
PokemonTypeService typeService = new PokemonTypeService();
@GET
@Produces(value = MediaType.APPLICATION_XML)
public List<PokemonType> returnAllTypes(@Context UriInfo uriInfo) {
List<PokemonType> allTypes = typeService.getAllTypes();
allTypes.forEach((t) -> {
String uri = uriInfo.getBaseUriBuilder().path(PokemonTypeRestResource.class).path(t.getType()).build().toString();
t.getLinks().add(new Link(uri, "Self"));
});
return allTypes;
}
@Path("{type}")
@GET
@Produces(value = MediaType.APPLICATION_XML)
public List<PokemonType> returnSpecificType(@PathParam("type") String type, @Context UriInfo uriInfo) {
List<PokemonType> specificType = typeService.getSpecificType(type);
specificType.forEach((t) -> {
String uri = uriInfo.getBaseUriBuilder().path(PokemonTypeRestResource.class).path(t.getType()).build().toString();
t.getLinks().add(new Link(uri, "Self"));
});
return specificType;
}
@Path("filter")
@GET
@Produces(value = MediaType.APPLICATION_XML)
public List<PokemonType> returnWeatherBoostedPokemonTypes(@QueryParam("weather") String weather, @Context UriInfo uriInfo) {
List<PokemonType> weatherBoostedTypes = typeService.getWeatherBoostedTypes(weather);
weatherBoostedTypes.forEach((t) -> {
String uri = uriInfo.getBaseUriBuilder().path(PokemonTypeRestResource.class).path(t.getType()).build().toString();
t.getLinks().add(new Link(uri, "Self"));
});
return weatherBoostedTypes;
}
}
资源模型：
@XmlRootElement(name = "Pokemon_Type")
@XmlAccessorType(value = XmlAccessType.FIELD)
@Entity
@Table(name = "pokemon_types")
public class PokemonType implements Serializable
{
//type & weather
@XmlElement(name = "Type")
@Id
@Column(name="type")
private String type;
@XmlElement(name = "Boosted_Weather")
@Column(name="weather")
private String weather;
@XmlElement(name = "Links")
private List<Link> links = new ArrayList<>();
//constructors
//getters & setters
}
我无法找到ApplicationConfig.java类的任何错误，因为以前没有其他应用程序中的问题，因此可以正常工作。配置球衣应用程序时，我是否会弄乱其他东西？