Replace deprecated org.apache.http.impl.client.DefaultHttpClient [#2956]

2025-10-13 04:53:16 +00:00 · 2020-09-24 10:45:11 -04:00
parent 7f53ab6bef
commit d77f6eef25
12 changed files with 173 additions and 140 deletions
--- a/dspace-api/src/main/java/org/dspace/app/util/WebAppServiceImpl.java
+++ b/dspace-api/src/main/java/org/dspace/app/util/WebAppServiceImpl.java
@@ -15,9 +15,9 @@ import java.util.List;

 import org.apache.http.HttpResponse;
 import org.apache.http.HttpStatus;
-import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpHead;
-import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.logging.log4j.Logger;
 import org.dspace.app.util.dao.WebAppDAO;
 import org.dspace.app.util.service.WebAppService;
@@ -76,13 +76,13 @@ public class WebAppServiceImpl implements WebAppService {

            for (WebApp app : webApps) {
                method = new HttpHead(app.getUrl());
-                HttpClient client = new DefaultHttpClient();
+                int status;
+                try (CloseableHttpClient client = HttpClientBuilder.create().build()) {
                    HttpResponse response = client.execute(method);
-                int status = response.getStatusLine().getStatusCode();
+                    status = response.getStatusLine().getStatusCode();
+                }
                if (status != HttpStatus.SC_OK) {
-                    delete(context, app
-
-                    );
+                    delete(context, app);
                    continue;
                }

--- a/dspace-api/src/main/java/org/dspace/ctask/general/MetadataWebService.java
+++ b/dspace-api/src/main/java/org/dspace/ctask/general/MetadataWebService.java
@@ -30,9 +30,9 @@ import javax.xml.xpath.XPathFactory;
 import org.apache.http.HttpEntity;
 import org.apache.http.HttpResponse;
 import org.apache.http.HttpStatus;
-import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpGet;
-import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.logging.log4j.Logger;
 import org.dspace.authorize.AuthorizeException;
 import org.dspace.content.DSpaceObject;
@@ -150,15 +150,16 @@ public class MetadataWebService extends AbstractCurationTask implements Namespac
    // field separator in result string
    protected String fieldSeparator = null;
    // optional XML namespace map
-    protected Map<String, String> nsMap = new HashMap<String, String>();
+    protected Map<String, String> nsMap = new HashMap<>();
    // optional HTTP headers
-    protected Map<String, String> headers = new HashMap<String, String>();
+    protected Map<String, String> headers = new HashMap<>();

    /**
     * Initializes task
     *
     * @param curator Curator object performing this task
     * @param taskId  the configured local name of the task
+     * @throws IOException if the parser could not be configured, or passed through.
     */
    @Override
    public void init(Curator curator, String taskId) throws IOException {
@@ -210,12 +211,6 @@ public class MetadataWebService extends AbstractCurationTask implements Namespac
        }
    }

-    /**
-     * Perform the curation task upon passed DSO
-     *
-     * @param dso the DSpace object
-     * @throws IOException if IO error
-     */
    @Override
    public int perform(DSpaceObject dso) throws IOException {

@@ -254,7 +249,7 @@ public class MetadataWebService extends AbstractCurationTask implements Namespac
    protected int callService(String value, Item item, StringBuilder resultSb) throws IOException {

        String callUrl = urlTemplate.replaceAll("\\{" + templateParam + "\\}", value);
-        HttpClient client = new DefaultHttpClient();
+        CloseableHttpClient client = HttpClientBuilder.create().build();
        HttpGet req = new HttpGet(callUrl);
        for (Map.Entry<String, String> entry : headers.entrySet()) {
            req.addHeader(entry.getKey(), entry.getValue());
@@ -289,7 +284,7 @@ public class MetadataWebService extends AbstractCurationTask implements Namespac
                // When HttpClient instance is no longer needed,
                // shut down the connection manager to ensure
                // immediate deallocation of all system resources
-                client.getConnectionManager().shutdown();
+                client.close();
            } else {
                log.error(" obtained no valid service response");
                resultSb.append("no service response");
@@ -304,7 +299,7 @@ public class MetadataWebService extends AbstractCurationTask implements Namespac
    protected int processResponse(Document doc, Item item, StringBuilder resultSb) throws IOException {
        boolean update = false;
        int status = Curator.CURATE_ERROR;
-        List<String> values = new ArrayList<String>();
+        List<String> values = new ArrayList<>();
        checkNamespaces(doc);
        try {
            for (MetadataWebServiceDataInfo info : dataList) {
@@ -399,7 +394,7 @@ public class MetadataWebService extends AbstractCurationTask implements Namespac
    }

    protected String[] tokenize(String text) {
-        List<String> list = new ArrayList<String>();
+        List<String> list = new ArrayList<>();
        Matcher m = ttPattern.matcher(text);
        while (m.find()) {
            if (m.group(1) != null) {
@@ -491,7 +486,7 @@ public class MetadataWebService extends AbstractCurationTask implements Namespac
            } else {
                int next = expr.indexOf("/", i);
                String token = (next > 0) ? expr.substring(i, next) : expr.substring(i);
-                if (!token.startsWith("@") && token.indexOf(":") < 0) {
+                if (!token.startsWith("@") && !token.contains(":")) {
                    sb.append(prefix).append(":");
                }
                sb.append(token);
--- a/dspace-api/src/main/java/org/dspace/ctask/general/MicrosoftTranslator.java
+++ b/dspace-api/src/main/java/org/dspace/ctask/general/MicrosoftTranslator.java
@@ -13,9 +13,9 @@ import java.nio.charset.StandardCharsets;

 import org.apache.commons.io.IOUtils;
 import org.apache.http.HttpResponse;
-import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpGet;
-import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.dspace.services.ConfigurationService;
@@ -60,22 +60,22 @@ public class MicrosoftTranslator extends AbstractTranslator {
        String url = baseUrl + "?appId=" + apiKey;
        url += "&to=" + to + "&from=" + from + "&text=" + text;

-        HttpClient client = new DefaultHttpClient();
+        try (CloseableHttpClient client = HttpClientBuilder.create().build()) {
            HttpGet hm = new HttpGet(url);
            HttpResponse httpResponse = client.execute(hm);
            log.debug("Response code from API call is " + httpResponse);

            if (httpResponse.getStatusLine().getStatusCode() == 200) {
-            String response = IOUtils.toString(httpResponse.getEntity().getContent(), StandardCharsets.ISO_8859_1);
+                String response = IOUtils.toString(httpResponse.getEntity().getContent(),
+                        StandardCharsets.ISO_8859_1);
                response = response
                        .replaceAll("<string xmlns=\"http://schemas.microsoft.com/2003/10/Serialization/\">", "");
                response = response.replaceAll("</string>", "");
                translatedText = response;
            }
-
+        }

        return translatedText;
    }
-
 }

--- a/dspace-api/src/main/java/org/dspace/external/provider/impl/LCNameDataProvider.java
+++ b/dspace-api/src/main/java/org/dspace/external/provider/impl/LCNameDataProvider.java
@@ -21,10 +21,10 @@ import javax.xml.parsers.SAXParserFactory;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.http.HttpEntity;
 import org.apache.http.HttpResponse;
-import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.utils.URIBuilder;
-import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.dspace.content.DCPersonName;
@@ -72,10 +72,12 @@ public class LCNameDataProvider implements ExternalDataProvider {
    protected static final String NS_MX = "http://www.loc.gov/MARC21/slim";


+    @Override
    public String getSourceIdentifier() {
        return sourceIdentifier;
    }

+    @Override
    public Optional<ExternalDataObject> getExternalDataObject(String id) {

        StringBuilder query = new StringBuilder();
@@ -138,8 +140,7 @@ public class LCNameDataProvider implements ExternalDataProvider {

        HttpGet get = constructHttpGet(query, start, limit);
        // 2. web request
-        try {
-            HttpClient hc = new DefaultHttpClient();
+        try (CloseableHttpClient hc = HttpClientBuilder.create().build()) {
            HttpResponse response = hc.execute(get);
            if (response.getStatusLine().getStatusCode() == 200) {
                SRUHandler handler = parseResponseToSRUHandler(response);
@@ -166,6 +167,7 @@ public class LCNameDataProvider implements ExternalDataProvider {
        return Collections.EMPTY_LIST;
    }

+    @Override
    public boolean supports(String source) {
        return StringUtils.equalsIgnoreCase(sourceIdentifier, source);
    }
@@ -208,8 +210,7 @@ public class LCNameDataProvider implements ExternalDataProvider {
        HttpGet get = constructHttpGet(queryStringBuilder, 0, 1);

        // 2. web request
-        try {
-            HttpClient hc = new DefaultHttpClient();
+        try ( CloseableHttpClient hc = HttpClientBuilder.create().build(); ) {
            HttpResponse response = hc.execute(get);
            if (response.getStatusLine().getStatusCode() == 200) {
                SRUHandler handler = parseResponseToSRUHandler(response);
@@ -253,8 +254,8 @@ public class LCNameDataProvider implements ExternalDataProvider {
     */
    private static class SRUHandler
        extends DefaultHandler {
-        private String sourceIdentifier;
-        private List<ExternalDataObject> result = new ArrayList<ExternalDataObject>();
+        private final String sourceIdentifier;
+        private List<ExternalDataObject> result = new ArrayList<>();
        private int hits = -1;
        private String textValue = null;
        private String name = null;
--- a/dspace-api/src/main/java/org/dspace/external/provider/impl/SherpaJournalDataProvider.java
+++ b/dspace-api/src/main/java/org/dspace/external/provider/impl/SherpaJournalDataProvider.java
@@ -18,13 +18,11 @@ import org.apache.commons.lang3.StringUtils;
 import org.apache.http.HttpEntity;
 import org.apache.http.HttpResponse;
 import org.apache.http.HttpStatus;
-import org.apache.http.client.HttpClient;
 import org.apache.http.client.config.RequestConfig;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.utils.URIBuilder;
 import org.apache.http.client.utils.URLEncodedUtils;
 import org.apache.http.impl.client.CloseableHttpClient;
-import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.http.message.BasicNameValuePair;
 import org.apache.logging.log4j.Logger;
@@ -35,8 +33,8 @@ import org.dspace.external.model.ExternalDataObject;
 import org.dspace.external.provider.ExternalDataProvider;

 /**
- * This class is the implementation of the ExternalDataProvider interface that will deal with SherpaJournal External
- * data lookups
+ * This class is the implementation of the ExternalDataProvider interface that
+ * will deal with SherpaJournal External data lookups.
 */
 public class SherpaJournalDataProvider implements ExternalDataProvider {

@@ -138,8 +136,7 @@ public class SherpaJournalDataProvider implements ExternalDataProvider {
    public List<ExternalDataObject> searchExternalDataObjects(String query, int start, int limit) {
        // query args to add to SHERPA/RoMEO request URL
        HttpGet get = constructHttpGet(query);
-        try {
-            HttpClient hc = new DefaultHttpClient();
+        try ( CloseableHttpClient hc = HttpClientBuilder.create().build(); ) {
            HttpResponse response = hc.execute(get);
            if (response.getStatusLine().getStatusCode() == 200) {

@@ -161,7 +158,7 @@ public class SherpaJournalDataProvider implements ExternalDataProvider {
    }

    private HttpGet constructHttpGet(String query) {
-        List<BasicNameValuePair> args = new ArrayList<BasicNameValuePair>();
+        List<BasicNameValuePair> args = new ArrayList<>();
        args.add(new BasicNameValuePair("jtitle", query));
        args.add(new BasicNameValuePair("qtype", "contains"));
        args.add(new BasicNameValuePair("ak", apiKey));
@@ -177,11 +174,9 @@ public class SherpaJournalDataProvider implements ExternalDataProvider {
    @Override
    public int getNumberOfResults(String query) {
        HttpGet get = constructHttpGet(query);
-        try {
-            HttpClient hc = new DefaultHttpClient();
+        try ( CloseableHttpClient hc = HttpClientBuilder.create().build(); ) {
            HttpResponse response = hc.execute(get);
            if (response.getStatusLine().getStatusCode() == 200) {
-
                SHERPAResponse sherpaResponse = new SHERPAResponse(response.getEntity().getContent());
                return sherpaResponse.getNumHits();
            }
--- a/dspace-api/src/main/java/org/dspace/external/provider/impl/SherpaPublisherDataProvider.java
+++ b/dspace-api/src/main/java/org/dspace/external/provider/impl/SherpaPublisherDataProvider.java
@@ -16,10 +16,10 @@ import java.util.stream.Collectors;
 import org.apache.commons.collections4.CollectionUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.http.HttpResponse;
-import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.utils.URLEncodedUtils;
-import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.http.message.BasicNameValuePair;
 import org.apache.logging.log4j.Logger;
 import org.dspace.app.sherpa.SHERPAPublisher;
@@ -29,8 +29,8 @@ import org.dspace.external.model.ExternalDataObject;
 import org.dspace.external.provider.ExternalDataProvider;

 /**
- * This class is the implementation of the ExternalDataProvider interface that will deal with SherpaPublisher External
- * data lookups
+ * This class is the implementation of the ExternalDataProvider interface that
+ * will deal with SherpaPublisher External data lookups.
 */
 public class SherpaPublisherDataProvider implements ExternalDataProvider {

@@ -47,13 +47,12 @@ public class SherpaPublisherDataProvider implements ExternalDataProvider {

    @Override
    public Optional<ExternalDataObject> getExternalDataObject(String id) {
-        List<BasicNameValuePair> args = new ArrayList<BasicNameValuePair>();
+        List<BasicNameValuePair> args = new ArrayList<>();
        args.add(new BasicNameValuePair("id", id));
        args.add(new BasicNameValuePair("ak", apiKey));
-        HttpClient hc = new DefaultHttpClient();
        String srUrl = url + "?" + URLEncodedUtils.format(args, "UTF8");
        HttpGet get = new HttpGet(srUrl);
-        try {
+        try ( CloseableHttpClient hc = HttpClientBuilder.create().build(); ) {
            HttpResponse response = hc.execute(get);
            if (response.getStatusLine().getStatusCode() == 200) {
                SHERPAResponse sherpaResponse = new SHERPAResponse(response.getEntity().getContent());
@@ -74,8 +73,7 @@ public class SherpaPublisherDataProvider implements ExternalDataProvider {
    @Override
    public List<ExternalDataObject> searchExternalDataObjects(String query, int start, int limit) {
        HttpGet get = constructHttpGet(query);
-        try {
-            HttpClient hc = new DefaultHttpClient();
+        try ( CloseableHttpClient hc = HttpClientBuilder.create().build(); ) {
            HttpResponse response = hc.execute(get);
            if (response.getStatusLine().getStatusCode() == 200) {
                SHERPAResponse sherpaResponse = new SHERPAResponse(response.getEntity().getContent());
@@ -97,7 +95,7 @@ public class SherpaPublisherDataProvider implements ExternalDataProvider {
    }

    private HttpGet constructHttpGet(String query) {
-        List<BasicNameValuePair> args = new ArrayList<BasicNameValuePair>();
+        List<BasicNameValuePair> args = new ArrayList<>();
        args.add(new BasicNameValuePair("pub", query));
        args.add(new BasicNameValuePair("qtype", "all"));
        args.add(new BasicNameValuePair("ak", apiKey));
@@ -135,8 +133,7 @@ public class SherpaPublisherDataProvider implements ExternalDataProvider {
    @Override
    public int getNumberOfResults(String query) {
        HttpGet get = constructHttpGet(query);
-        try {
-            HttpClient hc = new DefaultHttpClient();
+        try ( CloseableHttpClient hc = HttpClientBuilder.create().build(); ) {
            HttpResponse response = hc.execute(get);
            if (response.getStatusLine().getStatusCode() == 200) {

--- a/dspace-api/src/main/java/org/dspace/identifier/doi/DataCiteConnector.java
+++ b/dspace-api/src/main/java/org/dspace/identifier/doi/DataCiteConnector.java
@@ -20,14 +20,18 @@ import org.apache.http.HttpResponse;
 import org.apache.http.StatusLine;
 import org.apache.http.auth.AuthScope;
 import org.apache.http.auth.UsernamePasswordCredentials;
+import org.apache.http.client.CredentialsProvider;
 import org.apache.http.client.methods.HttpDelete;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.client.methods.HttpUriRequest;
+import org.apache.http.client.protocol.HttpClientContext;
 import org.apache.http.client.utils.URIBuilder;
 import org.apache.http.entity.ContentType;
 import org.apache.http.entity.StringEntity;
-import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.impl.client.BasicCredentialsProvider;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.http.util.EntityUtils;
 import org.dspace.authorize.AuthorizeException;
 import org.dspace.content.DSpaceObject;
@@ -269,10 +273,7 @@ public class DataCiteConnector
            default: {
                log.warn("While checking if the DOI {} is registered, we got a "
                             + "http status code {} and the message \"{}\".",
-                         new String[] {
-                             doi, Integer.toString(resp.statusCode),
-                             resp.getContent()
-                         });
+                        doi, Integer.toString(resp.statusCode), resp.getContent());
                throw new DOIIdentifierException("Unable to parse an answer from "
                                                     + "DataCite API. Please have a look into DSpace logs.",
                                                 DOIIdentifierException.BAD_ANSWER);
@@ -305,7 +306,7 @@ public class DataCiteConnector
            default: {
                log.warn("While checking if the DOI {} is registered, we got a "
                             + "http status code {} and the message \"{}\".",
-                         new String[] {doi, Integer.toString(response.statusCode), response.getContent()});
+                         doi, Integer.toString(response.statusCode), response.getContent());
                throw new DOIIdentifierException("Unable to parse an answer from "
                                                     + "DataCite API. Please have a look into DSpace logs.",
                                                 DOIIdentifierException.BAD_ANSWER);
@@ -338,7 +339,7 @@ public class DataCiteConnector
            default: {
                log.warn("While deleting metadata of DOI {}, we got a "
                             + "http status code {} and the message \"{}\".",
-                         new String[] {doi, Integer.toString(resp.statusCode), resp.getContent()});
+                         doi, Integer.toString(resp.statusCode), resp.getContent());
                throw new DOIIdentifierException("Unable to parse an answer from "
                                                     + "DataCite API. Please have a look into DSpace logs.",
                                                 DOIIdentifierException.BAD_ANSWER);
@@ -452,8 +453,8 @@ public class DataCiteConnector
            // Catch all other http status code in case we forgot one.
            default: {
                log.warn("While reserving the DOI {}, we got a http status code "
-                             + "{} and the message \"{}\".", new String[]
-                             {doi, Integer.toString(resp.statusCode), resp.getContent()});
+                             + "{} and the message \"{}\".",
+                        doi, Integer.toString(resp.statusCode), resp.getContent());
                throw new DOIIdentifierException("Unable to parse an answer from "
                                                     + "DataCite API. Please have a look into DSpace logs.",
                                                 DOIIdentifierException.BAD_ANSWER);
@@ -511,8 +512,8 @@ public class DataCiteConnector
            // Catch all other http status code in case we forgot one.
            default: {
                log.warn("While registration of DOI {}, we got a http status code "
-                             + "{} and the message \"{}\".", new String[]
-                             {doi, Integer.toString(resp.statusCode), resp.getContent()});
+                             + "{} and the message \"{}\".",
+                        doi, Integer.toString(resp.statusCode), resp.getContent());
                throw new DOIIdentifierException("Unable to parse an answer from "
                                                     + "DataCite API. Please have a look into DSpace logs.",
                                                 DOIIdentifierException.BAD_ANSWER);
@@ -684,14 +685,16 @@ public class DataCiteConnector
     */
    protected DataCiteResponse sendHttpRequest(HttpUriRequest req, String doi)
        throws DOIIdentifierException {
-        DefaultHttpClient httpclient = new DefaultHttpClient();
-        httpclient.getCredentialsProvider().setCredentials(
-            new AuthScope(HOST, 443),
+        CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
+        credentialsProvider.setCredentials(new AuthScope(HOST, 443),
                new UsernamePasswordCredentials(this.getUsername(), this.getPassword()));

+        HttpClientContext httpContext = HttpClientContext.create();
+        httpContext.setCredentialsProvider(credentialsProvider);
+
        HttpEntity entity = null;
-        try {
-            HttpResponse response = httpclient.execute(req);
+        try ( CloseableHttpClient httpclient = HttpClientBuilder.create().build(); ) {
+            HttpResponse response = httpclient.execute(req, httpContext);

            StatusLine status = response.getStatusLine();
            int statusCode = status.getStatusCode();
--- a/dspace-api/src/main/java/org/dspace/identifier/ezid/EZIDRequest.java
+++ b/dspace-api/src/main/java/org/dspace/identifier/ezid/EZIDRequest.java
@@ -17,13 +17,16 @@ import java.util.Map.Entry;
 import org.apache.http.HttpResponse;
 import org.apache.http.auth.AuthScope;
 import org.apache.http.auth.UsernamePasswordCredentials;
+import org.apache.http.client.CredentialsProvider;
 import org.apache.http.client.methods.HttpDelete;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.client.methods.HttpPut;
+import org.apache.http.client.protocol.HttpClientContext;
 import org.apache.http.entity.StringEntity;
-import org.apache.http.impl.client.AbstractHttpClient;
-import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.impl.client.BasicCredentialsProvider;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
 import org.dspace.identifier.DOI;
 import org.dspace.identifier.IdentifierException;
 import org.slf4j.Logger;
@@ -45,7 +48,9 @@ public class EZIDRequest {

    private static final String MD_KEY_STATUS = "_status";

-    private final AbstractHttpClient client;
+    private final CloseableHttpClient client;
+
+    private final HttpClientContext httpContext;

    private final String scheme;

@@ -82,11 +87,12 @@ public class EZIDRequest {
            this.authority = authority;
        }

-        client = new DefaultHttpClient();
+        client = HttpClientBuilder.create().build();
+        httpContext = HttpClientContext.create();
        if (null != username) {
            URI uri = new URI(scheme, host, path, null);
-            client.getCredentialsProvider().setCredentials(
-                new AuthScope(uri.getHost(), uri.getPort()),
+            CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
+            credentialsProvider.setCredentials(new AuthScope(uri.getHost(), uri.getPort()),
                    new UsernamePasswordCredentials(username, password));
        }
    }
@@ -118,12 +124,14 @@ public class EZIDRequest {
            this.authority = authority;
        }

-        client = new DefaultHttpClient();
+        client = HttpClientBuilder.create().build();
+        httpContext = HttpClientContext.create();
        if (null != username) {
+            CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
            URI uri = new URI(scheme, host, path, null);
-            client.getCredentialsProvider().setCredentials(
-                new AuthScope(uri.getHost(), uri.getPort()),
+            credentialsProvider.setCredentials(new AuthScope(uri.getHost(), uri.getPort()),
                    new UsernamePasswordCredentials(username, password));
+            httpContext.setCredentialsProvider(credentialsProvider);
        }
    }

@@ -143,7 +151,7 @@ public class EZIDRequest {
        URI uri = new URI(scheme, host, path + ID_PATH + authority + name, null);
        log.debug("EZID lookup {}", uri.toASCIIString());
        request = new HttpGet(uri);
-        HttpResponse response = client.execute(request);
+        HttpResponse response = client.execute(request, httpContext);
        return new EZIDResponse(response);
    }

@@ -169,7 +177,7 @@ public class EZIDRequest {
        if (null != metadata) {
            request.setEntity(new StringEntity(formatMetadata(metadata), UTF_8));
        }
-        HttpResponse response = client.execute(request);
+        HttpResponse response = client.execute(request, httpContext);
        return new EZIDResponse(response);
    }

@@ -193,7 +201,7 @@ public class EZIDRequest {
        if (null != metadata) {
            request.setEntity(new StringEntity(formatMetadata(metadata), UTF_8));
        }
-        HttpResponse response = client.execute(request);
+        HttpResponse response = client.execute(request, httpContext);
        EZIDResponse myResponse = new EZIDResponse(response);
        return myResponse;
    }
@@ -220,7 +228,7 @@ public class EZIDRequest {
        log.debug("EZID modify {}", uri.toASCIIString());
        request = new HttpPost(uri);
        request.setEntity(new StringEntity(formatMetadata(metadata), UTF_8));
-        HttpResponse response = client.execute(request);
+        HttpResponse response = client.execute(request, httpContext);
        return new EZIDResponse(response);
    }

@@ -240,7 +248,7 @@ public class EZIDRequest {
        URI uri = new URI(scheme, host, path + ID_PATH + authority + name, null);
        log.debug("EZID delete {}", uri.toASCIIString());
        request = new HttpDelete(uri);
-        HttpResponse response = client.execute(request);
+        HttpResponse response = client.execute(request, httpContext);
        return new EZIDResponse(response);
    }

@@ -255,7 +263,7 @@ public class EZIDRequest {
     */
    public EZIDResponse withdraw(String name)
        throws IOException, IdentifierException, URISyntaxException {
-        Map<String, String> metadata = new HashMap<String, String>();
+        Map<String, String> metadata = new HashMap<>();
        metadata.put(MD_KEY_STATUS, "unavailable");
        return modify(name, metadata);
    }
@@ -272,7 +280,7 @@ public class EZIDRequest {
     */
    public EZIDResponse withdraw(String name, String reason)
        throws IOException, IdentifierException, URISyntaxException {
-        Map<String, String> metadata = new HashMap<String, String>();
+        Map<String, String> metadata = new HashMap<>();
        metadata.put(MD_KEY_STATUS, "unavailable | " + escape(reason));
        return modify(name, metadata);
    }
--- a/dspace-api/src/main/java/org/dspace/statistics/SolrLoggerServiceImpl.java
+++ b/dspace-api/src/main/java/org/dspace/statistics/SolrLoggerServiceImpl.java
@@ -46,7 +46,8 @@ import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.time.DateFormatUtils;
 import org.apache.http.HttpResponse;
 import org.apache.http.client.methods.HttpGet;
-import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.apache.solr.client.solrj.SolrClient;
@@ -1067,7 +1068,7 @@ public class SolrLoggerServiceImpl implements SolrLoggerService, InitializingBea
             * The code below creates a query that will allow only records which do not have a bundlename
             * (items, collections, ...) or bitstreams that have a configured bundle name
             */
-            StringBuffer bundleQuery = new StringBuffer();
+            StringBuilder bundleQuery = new StringBuilder();
            //Also add the possibility that if no bundle name is there these results will also be returned !
            bundleQuery.append("-(bundleName:[* TO *]");
            for (int i = 0; i < bundles.length; i++) {
@@ -1219,12 +1220,20 @@ public class SolrLoggerServiceImpl implements SolrLoggerService, InitializingBea
                solrRequestUrl = generateURL(solrRequestUrl, yearQueryParams);

                HttpGet get = new HttpGet(solrRequestUrl);
-                HttpResponse response = new DefaultHttpClient().execute(get);
-                InputStream csvInputstream = response.getEntity().getContent();
+                InputStream csvInputstream;
+                File csvFile = new File(tempDirectory.getPath()
+                        + File.separatorChar
+                        + "temp."
+                        + dcStart.getYearUTC()
+                        + "."
+                        + i
+                        + ".csv");
+                try ( CloseableHttpClient hc = HttpClientBuilder.create().build(); ) {
+                    HttpResponse response = hc.execute(get);
+                    csvInputstream = response.getEntity().getContent();
                    //Write the csv ouput to a file !
-                File csvFile = new File(
-                    tempDirectory.getPath() + File.separatorChar + "temp." + dcStart.getYearUTC() + "." + i + ".csv");
                    FileUtils.copyInputStreamToFile(csvInputstream, csvFile);
+                }
                filesToUpload.add(csvFile);

                //Add 10000 & start over again
@@ -1300,14 +1309,14 @@ public class SolrLoggerServiceImpl implements SolrLoggerService, InitializingBea
    }

    /**
-     * Retrieves a list of all the multi valued fields in the solr core
+     * Retrieves a list of all the multi valued fields in the solr core.
     *
     * @return all fields tagged as multivalued
     * @throws SolrServerException When getting the schema information from the SOLR core fails
     * @throws IOException         When connection to the SOLR server fails
     */
    public Set<String> getMultivaluedFieldNames() throws SolrServerException, IOException {
-        Set<String> multivaluedFields = new HashSet<String>();
+        Set<String> multivaluedFields = new HashSet<>();
        LukeRequest lukeRequest = new LukeRequest();
        lukeRequest.setShowSchema(true);
        LukeResponse process = lukeRequest.process(solr);
@@ -1360,11 +1369,13 @@ public class SolrLoggerServiceImpl implements SolrLoggerService, InitializingBea
                solrRequestUrl = generateURL(solrRequestUrl, params);

                HttpGet get = new HttpGet(solrRequestUrl);
-                HttpResponse response = new DefaultHttpClient().execute(get);
-
+                List<String[]> rows;
+                try ( CloseableHttpClient hc = HttpClientBuilder.create().build(); ) {
+                    HttpResponse response = hc.execute(get);
                    InputStream csvOutput = response.getEntity().getContent();
                    Reader csvReader = new InputStreamReader(csvOutput);
-                List<String[]> rows = new CSVReader(csvReader).readAll();
+                    rows = new CSVReader(csvReader).readAll();
+                }
                String[][] csvParsed = rows.toArray(new String[rows.size()][]);
                String[] header = csvParsed[0];
                //Attempt to find the bitstream id index !
--- a/dspace-api/src/main/java/org/dspace/submit/lookup/CiNiiService.java
+++ b/dspace-api/src/main/java/org/dspace/submit/lookup/CiNiiService.java
@@ -19,10 +19,11 @@ import org.apache.http.HttpException;
 import org.apache.http.HttpResponse;
 import org.apache.http.HttpStatus;
 import org.apache.http.StatusLine;
-import org.apache.http.client.HttpClient;
+import org.apache.http.client.config.RequestConfig;
 import org.apache.http.client.methods.HttpGet;
-import org.apache.http.impl.client.DefaultHttpClient;
-import org.apache.http.params.CoreConnectionPNames;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.dspace.app.util.XMLUtils;
 import org.w3c.dom.Document;
@@ -35,7 +36,7 @@ public class CiNiiService {
    /**
     * log4j category
     */
-    private static final Logger log = org.apache.logging.log4j.LogManager.getLogger(CiNiiService.class);
+    private static final Logger log = LogManager.getLogger(CiNiiService.class);

    protected int timeout = 1000;

@@ -51,7 +52,7 @@ public class CiNiiService {
    public List<Record> searchByTerm(String title, String author, int year,
                                     int maxResults, String appId)
        throws HttpException, IOException {
-        List<Record> records = new ArrayList<Record>();
+        List<Record> records = new ArrayList<>();

        List<String> ids = getCiNiiIDs(title, author, year, maxResults, appId);
        if (ids != null && ids.size() > 0) {
@@ -78,10 +79,13 @@ public class CiNiiService {
    protected Record search(String id, String appId)
        throws IOException, HttpException {
        HttpGet method = null;
-        try {
-            HttpClient client = new DefaultHttpClient();
-            client.getParams().setIntParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, timeout);
+        try ( CloseableHttpClient client = HttpClientBuilder.create().build(); ) {
+            RequestConfig requestConfig = RequestConfig.custom()
+                    .setConnectTimeout(timeout)
+                    .build();
            method = new HttpGet("http://ci.nii.ac.jp/naid/" + id + ".rdf?appid=" + appId);
+            method.setConfig(requestConfig);
+
            // Execute the method.
            HttpResponse response = client.execute(method);
            StatusLine statusLine = response.getStatusLine();
@@ -129,7 +133,7 @@ public class CiNiiService {
     * @param title      record title
     * @param author     record author
     * @param year       record year
-     * @param maxResults maximun number of results returned
+     * @param maxResults maximum number of results returned
     * @param appId      registered application identifier for the API
     * @return matching NAIDs
     * @throws IOException   A general class of exceptions produced by failed or interrupted I/O operations.
@@ -144,10 +148,8 @@ public class CiNiiService {
        }

        HttpGet method = null;
-        List<String> ids = new ArrayList<String>();
-        try {
-            HttpClient client = new DefaultHttpClient();
-            client.getParams().setIntParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, timeout);
+        List<String> ids = new ArrayList<>();
+        try ( CloseableHttpClient client = HttpClientBuilder.create().build(); ) {
            StringBuilder query = new StringBuilder();
            query.append("format=rss&appid=").append(appId)
                 .append("&count=").append(maxResults);
@@ -161,7 +163,13 @@ public class CiNiiService {
                query.append("&year_from=").append(String.valueOf(year));
                query.append("&year_to=").append(String.valueOf(year));
            }
+
+            RequestConfig requestConfig = RequestConfig.custom()
+                    .setConnectTimeout(timeout)
+                    .build();
            method = new HttpGet("http://ci.nii.ac.jp/opensearch/search?" + query.toString());
+            method.setConfig(requestConfig);
+
            // Execute the method.
            HttpResponse response = client.execute(method);
            StatusLine statusLine = response.getStatusLine();
--- a/dspace-api/src/main/java/org/dspace/submit/lookup/CrossRefService.java
+++ b/dspace-api/src/main/java/org/dspace/submit/lookup/CrossRefService.java
@@ -30,10 +30,11 @@ import org.apache.http.HttpResponse;
 import org.apache.http.HttpStatus;
 import org.apache.http.StatusLine;
 import org.apache.http.client.HttpClient;
+import org.apache.http.client.config.RequestConfig;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.utils.URIBuilder;
-import org.apache.http.impl.client.DefaultHttpClient;
-import org.apache.http.params.CoreConnectionPNames;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.logging.log4j.Logger;
 import org.dspace.app.util.XMLUtils;
 import org.dspace.core.Context;
@@ -62,14 +63,13 @@ public class CrossRefService {
    public List<Record> search(Context context, Set<String> dois, String apiKey)
        throws HttpException, IOException, JDOMException,
        ParserConfigurationException, SAXException {
-        List<Record> results = new ArrayList<Record>();
+        List<Record> results = new ArrayList<>();
        if (dois != null && dois.size() > 0) {
            for (String record : dois) {
                try {
                    HttpGet method = null;
                    try {
-                        HttpClient client = new DefaultHttpClient();
-                        client.getParams().setIntParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, timeout);
+                        HttpClient client = HttpClientBuilder.create().build();

                        try {
                            URIBuilder uriBuilder = new URIBuilder(
@@ -77,7 +77,12 @@ public class CrossRefService {
                            uriBuilder.addParameter("pid", apiKey);
                            uriBuilder.addParameter("noredirect", "true");
                            uriBuilder.addParameter("id", record);
+
                            method = new HttpGet(uriBuilder.build());
+                            RequestConfig requestConfig = RequestConfig.custom()
+                                    .setConnectTimeout(timeout)
+                                    .build();
+                            method.setConfig(requestConfig);
                        } catch (URISyntaxException ex) {
                            throw new HttpException("Request not sent", ex);
                        }
@@ -140,9 +145,7 @@ public class CrossRefService {
    public List<Record> search(Context context, String title, String authors,
                               int year, int count, String apiKey) throws IOException, HttpException {
        HttpGet method = null;
-        try {
-            HttpClient client = new DefaultHttpClient();
-            client.getParams().setIntParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, timeout);
+        try ( CloseableHttpClient client = HttpClientBuilder.create().build(); ) {

            URIBuilder uriBuilder = new URIBuilder("http://search.labs.crossref.org/dois");

@@ -159,7 +162,12 @@ public class CrossRefService {

            uriBuilder.addParameter("year", year != -1 ? String.valueOf(year) : "");
            uriBuilder.addParameter("rows", count != -1 ? String.valueOf(count) : "");
+
            method = new HttpGet(uriBuilder.build());
+            RequestConfig requestConfig = RequestConfig.custom()
+                    .setConnectTimeout(timeout)
+                    .build();
+            method.setConfig(requestConfig);

            // Execute the method.
            HttpResponse response = client.execute(method);
@@ -177,7 +185,7 @@ public class CrossRefService {
            List<Map> json = gson.fromJson(
                IOUtils.toString(response.getEntity().getContent(), StandardCharsets.UTF_8),
                listType);
-            Set<String> dois = new HashSet<String>();
+            Set<String> dois = new HashSet<>();
            for (Map r : json) {
                dois.add(SubmissionLookupUtils.normalizeDOI((String) r
                    .get("doi")));
--- a/dspace-api/src/test/java/org/dspace/content/MetadataFieldNameTest.java
+++ b/dspace-api/src/test/java/org/dspace/content/MetadataFieldNameTest.java
@@ -1,3 +1,10 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
 package org.dspace.content;

 import static org.junit.Assert.assertEquals;