REST Java客户端API：在分配另一个之前释放连接

Question

我正在使用以下测试代码调用REST服务：

public class TestRESTServices {
    private static final String BASE_URL = "http://localhost/ma.ge.persistence-1.0/rest/reference";
    private static URI uri = UriBuilder.fromUri(BASE_URL).port(8080).build();
    private static Client client = ClientBuilder.newClient();

    @Test
    public void createAndDeleteAReference() {

        Reference r = ReferenceFactory.createReference("Maz",
                "dummy", 1.7);
        Response response = client.target(uri).request().post(Entity.entity(r, MediaType.APPLICATION_JSON));
        assertEquals(Response.Status.CREATED, response.getStatusInfo());

        URI referenceURI = response.getLocation();

        // Get the posted reference
        response = client.target(referenceURI).request().get();

        Reference retreivedRef = response.readEntity(Reference.class);
        assertEquals(Response.Status.OK, response.getStatusInfo());
        assertEquals(retreivedRef.getName(), r.getName());

    }

但是我收到以下错误：

在分配另一个之前，请确保释放连接。在org.apache.http.impl.conn.BasicClientConnectionManager $ 1.getConnection（BasicClientConnectionManager.java:139）在org.apache.http.impl.conn.BasicClientConnectionManager.java:162在org.apache.http。在org.apache.http.impl.client.AbstractHttpClient.execute（AbstractHttpClient.java:906）处的impl.client.DefaultRequestDirector.execute（DefaultRequestDirector.java:456）在org.apache.http.impl.client.AbstractHttpClient.execute（ org.jboss.resteasy.client.jaxrs.engines.ApacheHttpClient4Engine.invoke（ApacheHttpClient4Engine.java:283）上的AbstractHttpClient.java:805）...还有26个

Answer 1

该Client接口表示外部资源。因此，在静态变量中创建和存储一个是一个严重的错误。这是错误的：

private static Client client = ClientBuilder.newClient();

可以进行单元测试：

private Client client;

@Before
public void setUp() {
    this.client = ClientBuilder.newClient();
}

@After
public void tearDown() {
    this.client.close();
}

在普通代码中，您可能希望将Client用法包装在try-with-resources或中try..finally：

Client client = ClientBuilder.newClient();
try {
    // use the client to make requests
} finally {
    client.close();
}

理想情况下，将存在一种管理Client实例池以供重用的方法。