背景： 我正在使用hibernate和我的sql为我的模型层使用spring来公开REST服务。我有一个移动客户端，它使用后端的其余服务。该代码当前部署在AWS微实例上。
问题： 一旦并发用户的数量超过30-40，我就开始得到一个＆＃34; com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException：连接太多＆＃34;。据我所知，micro isntance上的mysql db配置为最多有30-35个连接，但在负载很高的情况下，我希望调用等待而不是出错。变得有点慢是可以接受的，但不应该出错。
代码： 这是由hibernate cfg文件：
com.jolbox.bonecp.provider.BoneCPConnectionProvider
org.hibernate.dialect.MySQLDialect
com.mysql.jdbc.Driver
<property name="bonecp.driverClass">com.mysql.jdbc.Driver</property>
<property name="bonecp.jdbcUrl">jdbc:mysql://***.rds.amazonaws.com:3306/jooky</property>
<property name="bonecp.username">**</property>
<property name="bonecp.password">**</property>
<property name="bonecp.maxConnectionAgeInSeconds">30</property>
<property name="bonecp.idleConnectionTestPeriodInMinutes">60</property>
<property name="bonecp.maxConnectionsPerPartition">25</property>
<property name="bonecp.minConnectionsPerPartition">10</property>
<property name="bonecp.partitionCount">1</property>
<property name="bonecp.acquireIncrement">5</property>
<property name="bonecp.statementsCacheSize">50</property>
<property name="acquireRetryDelayInMs">500</property>
<property name="acquireRetryAttempts">200</property>
<mapping class="jooky.model.entity.Party" />
<mapping class="jooky.model.entity.LocationRequest" />
<mapping class="jooky.model.entity.Location" />
<mapping class="jooky.model.entity.UserCheckinHistory" />
<mapping class="jooky.model.entity.Person" />
<mapping class="jooky.model.entity.UserLocSearchHistory"/>
</session-factory>
我必须公开REST服务的代码是：
@RequestMapping(value = "/getLocations", method = RequestMethod.POST)
public @ResponseBody
String getLocations(@RequestBody String input) {
Gson gson = new GsonBuilder().create();
NearbyLocationsRequest request = gson.fromJson(input,
NearbyLocationsRequest.class);
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
//SessionFactory sessionFactory = ControllerUtil.getSessionFactory();
Session session = sessionFactory.openSession();
session.beginTransaction();
String ret="Error:UNKNOWN_EXCEPTION: Server error.";
List results = null;
try {
// NearbyLocationQueryInput inputGson = gson.fromJson(input,
// NearbyLocationQueryInput.class);
if(request.getPersonId()== null )
{
ret="Error:CANNOT_CONNECT_PER_ID_NULL: Person Id cannot be null";
session.getTransaction().rollback();
session.close();
sessionFactory.close();
return ret;
}
List users = session
.createCriteria(Person.class)
.add(Restrictions.eq("personId", request.getPersonId()))
.list();
Person person = null;
if (users != null && users.size() > 0) {
person = (Person) users.get(0);
if(person.getPoints()==null)
person.setPoints(0);
}
else
{
ret="Error:CANNOT_CONNECT_PER_NOT_FOUND: No person found with id:"+request.getPersonId();
session.getTransaction().rollback();
session.close();
sessionFactory.close();
return ret;
}
double latitude = request.getLatitude();
double longitude = request.getLongitude();
// To search by kilometers instead of miles, replace 3959 with 6371
int distConstant = 6371;
if ("MILES".equals(request.getDistanceUnit()))
distConstant = 3959;
int queryRadius = 100;
if (request.getQueryRadius() != null)
queryRadius = request.getQueryRadius();
int maxResults = 100;
if (request.getMaxResults() != null)
maxResults = request.getMaxResults();
// latitude = input.getLatitude();
// longitude = input.getLongitude();
// Closest within radius of 25 Miles
Query query = session
.createSQLQuery(
" SELECT LOCATION_ID, LOCATION_NAME, LOC_FB_ID, LOC_GOOGLE_ID, LOCATION_EMAIL, FB_PAGE, IMAGE_LOCATION, "
+ " ADDRESS1, ADDRESS2, ADDRESS3, CITY, STATE, COUNTRY, ZIP, PHONE1, PHONE2, "
+ " PLAYLIST_NAME, PLAYER_STATUS, LOCATION_TYPE, CUSINE, LATITUDE, LONGITUDE, OPENING_TIME, CLOSING_TIME, HEARTBEAT_TIME, PLAYLIST_VERSION, "
+ " LOCATION_MESSAGE, WEBSITE, HIGHLIGHTS , "
+ " ( "
+ distConstant
+ " * acos( cos( radians(:bind_lat) ) * cos( radians( latitude ) ) * cos( radians( longitude ) - radians(:bind_long) ) + sin( radians(:bind_lat) ) * sin( radians( latitude ) ) ) ) AS DISTANCE "
+ " FROM location HAVING distance < "
+ queryRadius
+ " "
+ " ORDER BY distance LIMIT " + maxResults)
.addEntity(Location.class);
query.setParameter("bind_long", longitude);
query.setParameter("bind_lat", latitude);
results = query.list();
UserLocSearchHistory history = new UserLocSearchHistory();
history.setId(new UserLocSearchHistoryId(request.getPersonId(), new Date()));
history.setAppVersion(request.getAppVersion());
history.setLatitude(new BigDecimal(latitude));
history.setLongitude(new BigDecimal(longitude));
session.save(history);
NearbyLocationsResponse response = new NearbyLocationsResponse();
response.setUserPoints(person.getPoints());
response.setLocations(results);
session.getTransaction().commit();
session.flush();
session.close();
sessionFactory.close();
ret=gson.toJson(response);
} catch (Exception e) {
session.getTransaction().rollback();
session.flush();
session.close();
sessionFactory.close();
e.printStackTrace();
}
return ret;
}
错误堆栈： HTTP状态500 - 请求处理失败;嵌套异常是org.hibernate.HibernateException：org.hibernate.HibernateException：java.sql.SQLException：无法打开给定数据库的测试连接。 JDBC url = jdbc：mysql：//***。rds.amazonaws.com：3306 / jooky，username = jooky。终止连接池。原始例外：------ 类型异常报告
消息请求处理失败;嵌套异常是org.hibernate.HibernateException：org.hibernate.HibernateException：java.sql.SQLException：无法打开给定数据库的测试连接。 JDBC url = jdbc：mysql：//****.amazonaws.com：3306 / jooky，username = ****。终止连接池。原始异常：------
描述服务器遇到内部错误，导致无法完成此请求。
异常< / b>
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.HibernateException: org.hibernate.HibernateException: java.sql.SQLException: Unable to open a test connection to the given database. JDBC url = jdbc:mysql://*****.com:3306/jooky, username = jooky. Terminating connection pool. Original Exception: ------
com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Too many connections
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:921)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:885)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3421)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1247)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2775)
at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:215)
at com.jolbox.bonecp.BoneCP.obtainRawInternalConnection(BoneCP.java:309)
at com.jolbox.bonecp.BoneCP.<init>(BoneCP.java:346)
at com.jolbox.bonecp.provider.BoneCPConnectionProvider.createPool(BoneCPConnectionProvider.java:167)
at com.jolbox.bonecp.provider.BoneCPConnectionProvider.configure(BoneCPConnectionProvider.java:141)
at com.jolbox.bonecp.provider.BoneCPConnectionProvider.configure(BoneCPConnectionProvider.java:271)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:89)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:206)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:973)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
根本原因 org.hibernate.HibernateException：org.hibernate.HibernateException：java.sql.SQLException：Unable打开与给定数据库的测试连接。 JDBC url = jdbc：mysql：//aa1hw2wctsxa60n.ckmpnrdgeoee.ap-southeast-1.rds.amazonaws.com:3306 / jooky，username = jooky。终止连接池。原始例外：------ com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException：连接太多 在com.mysql.jdbc.SQLError.createSQLException（SQLError.java:921） 在com.mysql.jdbc.MysqlIO.checkErrorPacket（MysqlIO.java:2985） 在com.mysql.jdbc.MysqlIO.checkErrorPacket（MysqlIO.java:885） 在com.mysql.jdbc.MysqlIO.secureAuth411（MysqlIO.java:3421） 在com.mysql.jdbc.MysqlIO.doHandshake（MysqlIO.java:1247） 在com.mysql.jdbc.Connection.createNewIO（Connection.java:2775） 在com.mysql.jdbc.Connection。＆lt; init＆gt;（Connection.java:1555） 在com.mysql.jdbc.NonRegisteringDriver.connect（NonRegisteringDriver.java:285） 在java.sql.DriverManager.getConnection（DriverManager.java:571） 在java.sql.DriverManager.getConnection（DriverManager.java:215） 在com.jolbox.bonecp.BoneCP.obtainRawInternalConnection（BoneCP.java:309） 在com.jolbox.bonecp.BoneCP。＆lt; init＆gt;（BoneCP.java:346） 在com.jolbox.bonecp.provider.BoneCPConnectionProvider.createPool（BoneCPConnectionProvider.java:167） 在com.jolbox.bonecp.provider.BoneCPConnectionProvider.configure（BoneCPConnectionProvider.java:141） 在com.jolbox.bonecp.provider.BoneCPConnectionProvider.configure（BoneCPConnectionProvider.java:271） at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService（StandardServiceRegistryImpl.java:89） 在org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService（AbstractServiceRegistryImpl.java:206） at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService（AbstractServiceRegistryImpl.java:178） 在org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess（JdbcServicesImpl.java:260） 在org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure（JdbcServicesImpl.java:94） at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService（StandardServiceRegistryImpl.java:89） 在org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService（AbstractServiceRegistryImpl.java:206） at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService（AbstractServiceRegistryImpl.java:178） 在org.hibernate.cfg.Configuration.buildTypeRegistrations（Configuration.java:1885） 在org.hibernate.cfg.Configuration.buildSessionFactory（Configuration.java:1843） 在org.hibernate.cfg.Configuration.buildSessionFactory（Configuration.java:1928） 在jooky.controller.JookyController.getLocations（JookyController.java:72）
答案 0 :(得分：0)
这是由于mysql连接限制。要删除此类错误/异常，您需要在mysql中增加max_connection变量。