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CloudemixのLiberty for Javaを使用してCloudantに接続することでアプリケーションを作成します。 RESTful APIに接続している間、毎日RuntimeExceptionが見つかりました。しかし、この問題を解決するには、毎日アプリケーションを再起動する必要があります。BluemixのLiberty for JavaとCloudantとの接続は毎日RuntimeErrorを投げる
エラーは以下のように示されている：
Exception thrown by application class 'org.apache.cxf.interceptor.AbstractFaultChainInitiatorObserver.onMessage:116'
java.lang.RuntimeException: org.apache.cxf.interceptor.Fault: Error retrieving server response
at org.apache.cxf.interceptor.AbstractFaultChainInitiatorObserver.onMessage(AbstractFaultChainInitiatorObserver.java:116)
at [internal classes]
Caused by: org.apache.cxf.interceptor.Fault: Error retrieving server response
at org.apache.cxf.service.invoker.AbstractInvoker.createFault(AbstractInvoker.java:163)
... 1 more
Caused by: com.cloudant.client.org.lightcouch.CouchDbException: Error retrieving server response
at com.cloudant.client.org.lightcouch.CouchDbClient.execute(CouchDbClient.java:501)
at com.cloudant.client.org.lightcouch.CouchDbClient.executeToInputStream(CouchDbClient.java:515)
at com.cloudant.client.api.Database.findByIndex(Database.java:361)
at com.cloudant.client.api.Database.findByIndex(Database.java:321)
at th.co.gosoft.rest.TopicService.getHotTopicList(TopicService.java:82)
at sun.reflect.GeneratedMethodAccessor34.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.ibm.ws.jaxrs20.server.LibertyJaxRsServerFactoryBean.performInvocation(LibertyJaxRsServerFactoryBean.java:636)
... 1 more
Caused by: java.net.ProtocolException: Server rejected operation
at sun.net.www.protocol.http.HttpURLConnection.expect100Continue(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(Unknown Source)
at com.ibm.net.ssl.www2.protocol.https.b.getOutputStream(Unknown Source)
at com.cloudant.http.HttpConnection.execute(HttpConnection.java:231)
at com.cloudant.client.org.lightcouch.CouchDbClient.execute(CouchDbClient.java:466)
... 9 more
Iは以下のように、このCloudantClientMgrを使用する：
package th.co.gosoft.util;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Map.Entry;
import java.util.Set;
import com.cloudant.client.api.ClientBuilder;
import com.cloudant.client.api.CloudantClient;
import com.cloudant.client.api.Database;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
public class CloudantClientMgr {
private static CloudantClient cloudant = null;
private static Database db = null;
private static String databaseName = "go10_db";
private static String url = "https://xxxxxxxxxx-bluemix.cloudant.com";
private static String user = "xxxxxxxxxx-bluemix";
private static String password = "password";
private static void initClient() {
if (cloudant == null) {
synchronized (CloudantClientMgr.class) {
if (cloudant != null) {
return;
}
try {
cloudant = createClient();
} catch (MalformedURLException e) {
throw new RuntimeException(e.getMessage(), e);
}
System.out.println("cloudant : " + cloudant.serverVersion());
}
}
}
private static CloudantClient createClient() throws MalformedURLException {
String VCAP_SERVICES = System.getenv("VCAP_SERVICES");
String serviceName = null;
CloudantClient client;
if (VCAP_SERVICES != null) {
System.out.println("VCAP_SERVICE");
JsonObject obj = (JsonObject) new JsonParser().parse(VCAP_SERVICES);
Entry<String, JsonElement> dbEntry = null;
Set<Entry<String, JsonElement>> entries = obj.entrySet();
for (Entry<String, JsonElement> eachEntry : entries) {
if (eachEntry.getKey().toLowerCase().contains("cloudant")) {
dbEntry = eachEntry;
break;
}
}
if (dbEntry == null) {
throw new RuntimeException("Could not find cloudantNoSQLDB key in VCAP_SERVICES env variable");
}
obj = (JsonObject) ((JsonArray) dbEntry.getValue()).get(0);
serviceName = (String) dbEntry.getKey();
System.out.println("Service Name - " + serviceName);
obj = (JsonObject) obj.get("credentials");
user = obj.get("username").getAsString();
password = obj.get("password").getAsString();
client = ClientBuilder.account(user)
.username(user)
.password(password)
.build();
} else {
System.out.println("LOCAL");
client = ClientBuilder.url(new URL(url))
.username(user)
.password(password)
.build();
}
return client;
}
public static Database getDB() {
if (cloudant == null) {
initClient();
}
if (db == null) {
try {
db = cloudant.database(databaseName, true);
} catch (Exception e) {
throw new RuntimeException("DB Not found", e);
}
}
return db;
}
private CloudantClientMgr() {
}
}
Iは以下のようにCloudantClientMgrを接続するには、このコードを使用する：
@Path("topic")
public class TopicService {
@POST
@Path("/post")
@Consumes(MediaType.APPLICATION_JSON + ";charset=utf-8")
public Response createTopic(TopicModel topicModel) {
Database db = CloudantClientMgr.getDB();
com.cloudant.client.api.model.Response response = db.save(topicModel);
String result = response.getId();
return Response.status(201).entity(result).build();
}
}
クラウド版は2.4.2
この問題を発見した人がいたら、毎日自分のアプリケーションを再起動するよりも良い解決策を教えてください。