尝试运行olingo项目以调用odata服务时出现Geeting错误

Question

我正在尝试使用apache olingo调用odata服务（https://ncsi-core-jslk.cfapps.su19.hana.ondemand.com/odata/cpec.xsodata/TankDetails）。

我从站点sample->客户端获取的示例文件具有以下代码：

import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.apache.olingo.client.api.ODataClient;
import org.apache.olingo.client.api.communication.request.cud.ODataDeleteRequest;
import org.apache.olingo.client.api.communication.request.cud.ODataEntityCreateRequest;
import org.apache.olingo.client.api.communication.request.cud.ODataEntityUpdateRequest;
import org.apache.olingo.client.api.communication.request.cud.UpdateType;
import org.apache.olingo.client.api.communication.request.retrieve.EdmMetadataRequest;
import org.apache.olingo.client.api.communication.request.retrieve.ODataEntityRequest;
import org.apache.olingo.client.api.communication.request.retrieve.ODataEntitySetIteratorRequest;
import org.apache.olingo.client.api.communication.response.ODataDeleteResponse;
import org.apache.olingo.client.api.communication.response.ODataEntityCreateResponse;
import org.apache.olingo.client.api.communication.response.ODataEntityUpdateResponse;
import org.apache.olingo.client.api.communication.response.ODataRetrieveResponse;
import org.apache.olingo.client.api.domain.ClientCollectionValue;
import org.apache.olingo.client.api.domain.ClientComplexValue;
import org.apache.olingo.client.api.domain.ClientEntity;
import org.apache.olingo.client.api.domain.ClientEntitySet;
import org.apache.olingo.client.api.domain.ClientEntitySetIterator;
import org.apache.olingo.client.api.domain.ClientEnumValue;
import org.apache.olingo.client.api.domain.ClientProperty;
import org.apache.olingo.client.api.domain.ClientValue;
import org.apache.olingo.client.api.serialization.ODataDeserializerException;
import org.apache.olingo.client.core.ODataClientFactory;
import org.apache.olingo.commons.api.edm.Edm;
import org.apache.olingo.commons.api.edm.EdmComplexType;
import org.apache.olingo.commons.api.edm.EdmEntityType;
import org.apache.olingo.commons.api.edm.EdmProperty;
import org.apache.olingo.commons.api.edm.EdmSchema;
import org.apache.olingo.commons.api.edm.FullQualifiedName;
import org.apache.olingo.commons.api.format.ContentType;


/**
 *
 */
public class OlingoSampleApp {
  private ODataClient client;

  public OlingoSampleApp() {
    client = ODataClientFactory.getClient();
  }

  public static void main(String[] params) throws Exception {
    OlingoSampleApp app = new OlingoSampleApp();
    app.perform("https://ncsi-core-jslk.cfapps.su19.hana.ondemand.com/odata/cpec.xsodata/TankDetails");
  }

  void perform(String serviceUrl) throws Exception {

    print("\n----- Read Edm ------------------------------");
    Edm edm = readEdm(serviceUrl);
    List<FullQualifiedName> ctFqns = new ArrayList<FullQualifiedName>();
    System.out.println("EDM STRING" + ctFqns);
    List<FullQualifiedName> etFqns = new ArrayList<FullQualifiedName>();
    for (EdmSchema schema : edm.getSchemas()) {
      for (EdmComplexType complexType : schema.getComplexTypes()) {
        ctFqns.add(complexType.getFullQualifiedName());
      }
      for (EdmEntityType entityType : schema.getEntityTypes()) {
        etFqns.add(entityType.getFullQualifiedName());
      }
    }
    print("Found ComplexTypes", ctFqns);
    print("Found EntityTypes", etFqns);

    print("\n----- Inspect each property and its type of the first entity: " + etFqns.get(0) + "----");
    EdmEntityType etype = edm.getEntityType(etFqns.get(0));
    for (String propertyName : etype.getPropertyNames()) {
      EdmProperty property = etype.getStructuralProperty(propertyName);
      FullQualifiedName typeName = property.getType().getFullQualifiedName();
      print("property '" + propertyName + "' " + typeName);
    }

    print("\n----- Read Entities ------------------------------");
    ClientEntitySetIterator<ClientEntitySet, ClientEntity> iterator = 
      readEntities(edm, serviceUrl, "Manufacturers");

    while (iterator.hasNext()) {
      ClientEntity ce = iterator.next();
      print("Entry:\n" + prettyPrint(ce.getProperties(), 0));
    }

    print("\n----- Read Entry ------------------------------");
    ClientEntity entry = readEntityWithKey(edm, serviceUrl, "Manufacturers", 1);
    print("Single Entry:\n" + prettyPrint(entry.getProperties(), 0));

    //
    print("\n----- Read Entity with $expand  ------------------------------");
    entry = readEntityWithKeyExpand(edm, serviceUrl, "Manufacturers", 1, "Cars");
    print("Single Entry with expanded Cars relation:\n" + prettyPrint(entry.getProperties(), 0));

    //
    print("\n----- Read Entities with $filter  ------------------------------");
    iterator = readEntitiesWithFilter(edm, serviceUrl, "Manufacturers", "Name eq 'Horse Powered Racing'");
    while (iterator.hasNext()) {
      ClientEntity ce = iterator.next();
      print("Entry:\n" + prettyPrint(ce.getProperties(), 0));
    }

  }

  private static void print(String content) {
    System.out.println(content);
  }

  private static void print(String content, List<?> list) {
    System.out.println(content);
    for (Object o : list) {
        System.out.println("    " + o);
    }
      System.out.println();
  }

  private static String prettyPrint(Map<String, Object> properties, int level) {
    StringBuilder b = new StringBuilder();
    Set<Entry<String, Object>> entries = properties.entrySet();

    for (Entry<String, Object> entry : entries) {
      intend(b, level);
      b.append(entry.getKey()).append(": ");
      Object value = entry.getValue();
      if(value instanceof Map) {
        value = prettyPrint((Map<String, Object>) value, level+1);
      } else if(value instanceof Calendar) {
        Calendar cal = (Calendar) value;
        value = SimpleDateFormat.getInstance().format(cal.getTime());
      }
      b.append(value).append("\n");
    }
    // remove last line break
    b.deleteCharAt(b.length()-1);
    return b.toString();
  }

  private static String prettyPrint(Collection<ClientProperty> properties, int level) {
    StringBuilder b = new StringBuilder();

    for (ClientProperty entry : properties) {
      intend(b, level);
      ClientValue value = entry.getValue();
      if (value.isCollection()) {
        ClientCollectionValue cclvalue = value.asCollection();
        b.append(prettyPrint(cclvalue.asJavaCollection(), level + 1));
      } else if (value.isComplex()) {
        ClientComplexValue cpxvalue = value.asComplex();
        b.append(prettyPrint(cpxvalue.asJavaMap(), level + 1));
      } else if (value.isEnum()) {
        ClientEnumValue cnmvalue = value.asEnum();
        b.append(entry.getName()).append(": ");
        b.append(cnmvalue.getValue()).append("\n");
      } else if (value.isPrimitive()) {
        b.append(entry.getName()).append(": ");
        b.append(entry.getValue()).append("\n");
      }
    }
    return b.toString();
  }

  private static void intend(StringBuilder builder, int intendLevel) {
    for (int i = 0; i < intendLevel; i++) {
      builder.append("  ");
    }
  }

  public Edm readEdm(String serviceUrl) throws IOException {
    EdmMetadataRequest request = client.getRetrieveRequestFactory().getMetadataRequest(serviceUrl);
    ODataRetrieveResponse<Edm> response = request.execute();
    return response.getBody();
  }

  public ClientEntitySetIterator<ClientEntitySet, ClientEntity> readEntities(Edm edm, String serviceUri,
    String entitySetName) {
    URI absoluteUri = client.newURIBuilder(serviceUri).appendEntitySetSegment(entitySetName).build();
    return readEntities(edm, absoluteUri);
  }

  public ClientEntitySetIterator<ClientEntitySet, ClientEntity> readEntitiesWithFilter(Edm edm, String serviceUri,
    String entitySetName, String filterName) {
    URI absoluteUri = client.newURIBuilder(serviceUri).appendEntitySetSegment(entitySetName).filter(filterName).build();
    return readEntities(edm, absoluteUri);
  }

  private ClientEntitySetIterator<ClientEntitySet, ClientEntity> readEntities(Edm edm, URI absoluteUri) {
    System.out.println("URI = " + absoluteUri);
    ODataEntitySetIteratorRequest<ClientEntitySet, ClientEntity> request = 
      client.getRetrieveRequestFactory().getEntitySetIteratorRequest(absoluteUri);
    // odata4 sample/server limitation not handling metadata=full
    request.setAccept("application/json;odata.metadata=minimal");
    ODataRetrieveResponse<ClientEntitySetIterator<ClientEntitySet, ClientEntity>> response = request.execute(); 

    return response.getBody();
  }

  public ClientEntity readEntityWithKey(Edm edm, String serviceUri, String entitySetName, Object keyValue) {
    URI absoluteUri = client.newURIBuilder(serviceUri).appendEntitySetSegment(entitySetName)
      .appendKeySegment(keyValue).build();
    return readEntity(edm, absoluteUri);
  }

  public ClientEntity readEntityWithKeyExpand(Edm edm, String serviceUri, String entitySetName, Object keyValue,
    String expandRelationName) {
    URI absoluteUri = client.newURIBuilder(serviceUri).appendEntitySetSegment(entitySetName).appendKeySegment(keyValue)
      .expand(expandRelationName).build();
    return readEntity(edm, absoluteUri);
  }

  private ClientEntity readEntity(Edm edm, URI absoluteUri) {
    ODataEntityRequest<ClientEntity> request = client.getRetrieveRequestFactory().getEntityRequest(absoluteUri);
    // odata4 sample/server limitation not handling metadata=full
    request.setAccept("application/json;odata.metadata=minimal");
    ODataRetrieveResponse<ClientEntity> response = request.execute(); 

    return response.getBody();
  }

  private ClientEntity loadEntity(String path) throws ODataDeserializerException {
    InputStream input = getClass().getResourceAsStream(path);
    return client.getBinder().getODataEntity(client.getDeserializer(ContentType.APPLICATION_JSON).toEntity(input));
  }




}

但是当我将此文件作为Java应用程序运行时，出现以下错误：

线程“主”中的异常java.lang.NoSuchMethodError：org.apache.http.util.VersionInfo.getUserAgent（Ljava / lang / String; Ljava / lang / String; Ljava / lang / Class;）Ljava / lang /串;     在org.apache.http.impl.client.DefaultHttpClient.setDefaultHttpParams（DefaultHttpClient.java:185）     在org.apache.http.impl.client.DefaultHttpClient.createHttpParams（DefaultHttpClient.java:160）     在org.apache.http.impl.client.AbstractHttpClient.getParams（AbstractHttpClient.java:418）     在org.apache.olingo.client.core.http.DefaultHttpClientFactory.create（DefaultHttpClientFactory.java:36）     在org.apache.olingo.client.core.http.DefaultHttpClientFactory.create（DefaultHttpClientFactory.java:31）     在org.apache.olingo.client.core.communication.request.AbstractODataRequest.getHttpClient（AbstractODataRequest.java:346）     在org.apache.olingo.client.core.communication.request.AbstractODataRequest。（AbstractODataRequest.java:104）     在org.apache.olingo.client.core.communication.request.AbstractODataBasicRequest。（AbstractODataBasicRequest.java:57）     在org.apache.olingo.client.core.communication.request.retrieve.AbstractODataRetrieveRequest。（AbstractODataRetrieveRequest.java:47）     在org.apache.olingo.client.core.communication.request.retrieve.AbstractMetadataRequestImpl。（AbstractMetadataRequestImpl.java:30）     在org.apache.olingo.client.core.communication.request.retrieve.EdmMetadataRequestImpl。（EdmMetadataRequestImpl.java:42）     在org.apache.olingo.client.core.communication.request.retrieve.RetrieveRequestFactoryImpl.getMetadataRequest（RetrieveRequestFactoryImpl.java:78）     在com.sap.iotservices.gateway.olingo.client.http.OlingoSampleApp.readEdm（OlingoSampleApp.java:197）     在com.sap.iotservices.gateway.olingo.client.http.OlingoSampleApp.perform（OlingoSampleApp.java:82）     在com.sap.iotservices.gateway.olingo.client.http.OlingoSampleApp.main（OlingoSampleApp.java:76）

我的项目构建路径中已经有以下jar：

org.apache.httpcomponents-httpclient-4.2.6.jar

org.apache.httpcomponents-httpcore-4.2.5.jar

谢谢， 史密斯。