我正在尝试使用Hibernate和Jersey保存实体。
我尝试发送的JSON是：
{
"firstname":"Jon",
"middlename":"J",
"lastname":"Smith",
"dob":"10-10-1990",
"gender":"male"
}
当我使用Postman发送时，我得到Status: 200 OK，但记录未保存在数据库中。
我使用的数据库是Neo4j。
这是我的PersonDAO课程：
package com.Neo4jRestAPI;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import org.hibernate.HibernateException;
import com.google.gson.Gson;
public class PersonDAO {
public void addPerson(Person person){
try {
EntityManagerFactory emf = Persistence.createEntityManagerFactory("persistence");
EntityManager em = emf.createEntityManager();
EntityTransaction tx = em.getTransaction();
tx.begin();
Person p = new Person();
p.setFirstname(person.getFirstname());
p.setMiddlename(person.getMiddlename());
p.setLastname(person.getLastname());
p.setDob(person.getDob());
p.setGender(person.getGender());
em.persist(p);
em.flush();
tx.commit();
em.clear();
em.close();
emf.close();
}
catch ( Exception e ) {
e.printStackTrace();
}
}
}
这是我尝试发送数据的方式：
@POST
@Path("/person")
@Consumes("application/json")
public Response addPerson(Person person){
person.setFirstname(person.getFirstname());
person.setMiddlename(person.getMiddlename());
person.setLastname(person.getLastname());
person.setDob(person.getDob());
person.setGender(person.getGender());
PersonDAO dao = new PersonDAO();
dao.addPerson(person);
return Response.ok().build();
}
有谁知道我在这里做错了什么？
修改
我能够使用native query保存实体，但这样，id不会自动生成。我仍然无法按照上述方式保存实体
当我删除@GeneratedValue并在JSON中指定id时，我能够保存实体，因此我认为存在问题。我尝试了几种策略，但没有一种能有效。
这是我尝试自动生成id：
@Entity
@Table(name="Person")
public class Person {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "id")
private Long id;
此外，当我打印方法getId()时，我得到自动递增的值。
以下是已执行的Cypher查询：
"{"statements":[{"statement":"CREATE (n:ENTITY:Person {props}) RETURN n","parameters":{"props":{"firstname":"Jon","gender":"male","dob":"10-10-1990","middlename":"J","id":99,"lastname":"Smith"}},"includeStats":false,"resultDataContents":["graph"]}]}"
我也收到了一个事务回滚错误，但它没有说明为什么它已被回滚：
"Neo.ClientError.Transaction.TransactionNotFound","message":"Unrecognized transaction id. Transaction may have timed out and been rolled back
这是我的persistence.xml文件
<?xml version="1.0"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
<persistence-unit name="persistence">
<provider>org.hibernate.ogm.jpa.HibernateOgmPersistence</provider>
<properties>
<property name="hibernate.ogm.datastore.provider" value="neo4j_http"/>
<property name="hibernate.ogm.neo4j.database_path" value="C://path//to//database"/>
<property name="hibernate.ogm.datastore.host" value="localhost:7474"/>
<property name="hibernate.ogm.datastore.username" value="neo4j"/>
<property name="hibernate.ogm.datastore.password" value="root"/>
</properties>
</persistence-unit>
</persistence>
修改
这是我得到的堆栈跟踪：
log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
当我使用log4j并添加BasicConfiguratior.configure()时，我得到以下内容（在此处发布整个日志非常大，所以我只是发布了错误的部分内容）：
2342 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - >> "{"statements":[{"statement":"CREATE (n:ENTITY:Person {props}) RETURN n","parameters":{"props":{"firstname":"Anna","gender":"female","dob":"10-10-1990","middlename":"J","id":57,"lastname":"Smith"}},"includeStats":false,"resultDataContents":["graph"]}]}"
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "HTTP/1.1 200 OK[\r][\n]"
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "Date: Tue, 03 Oct 2017 09:01:10 GMT[\r][\n]"
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "Content-Type: application/json[\r][\n]"
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "Access-Control-Allow-Origin: *[\r][\n]"
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "Content-Length: 372[\r][\n]"
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "Server: Jetty(9.2.z-SNAPSHOT)[\r][\n]"
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "[\r][\n]"
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.impl.conn.DefaultClientConnection - Receiving response: HTTP/1.1 200 OK
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - << HTTP/1.1 200 OK
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - << Date: Tue, 03 Oct 2017 09:01:10 GMT
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - << Content-Type: application/json
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - << Access-Control-Allow-Origin: *
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - << Content-Length: 372
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - << Server: Jetty(9.2.z-SNAPSHOT)
2345 [http-nio-8080-exec-4] DEBUG org.apache.http.impl.client.DefaultHttpClient - Connection can be kept alive indefinitely
2346 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "{"commit":"http://localhost:7474/db/data/transaction/53/commit","results":[{"columns":["n"],"data":[{"graph":{"nodes":[{"id":"10","labels":["ENTITY","Person"],"properties":{"firstname":"Anna","gender":"female","dob":"10-10-1990","middlename":"J","id":57,"lastname":"Smith"}}],"relationships":[]}}]}],"transaction":{"expires":"Tue, 03 Oct 2017 09:02:10 +0000"},"errors":[]}"
2346 [http-nio-8080-exec-4] DEBUG org.apache.http.impl.conn.PoolingClientConnectionManager - Connection [id: 1][route: {}->http://localhost:7474] can be kept alive indefinitely
2346 [http-nio-8080-exec-4] DEBUG org.apache.http.impl.conn.PoolingClientConnectionManager - Connection released: [id: 1][route: {}->http://localhost:7474][total kept alive: 1; route allocated: 2 of 10; total allocated: 2 of 10]
2350 [http-nio-8080-exec-4] DEBUG org.hibernate.engine.transaction.internal.TransactionImpl - committing
2350 [http-nio-8080-exec-4] DEBUG org.hibernate.event.internal.AbstractFlushingEventListener - Processing flush-time cascades
2350 [http-nio-8080-exec-4] DEBUG org.hibernate.event.internal.AbstractFlushingEventListener - Dirty checking collections
2350 [http-nio-8080-exec-4] DEBUG org.hibernate.event.internal.AbstractFlushingEventListener - Flushed: 0 insertions, 0 updates, 0 deletions to 1 objects
2350 [http-nio-8080-exec-4] DEBUG org.hibernate.event.internal.AbstractFlushingEventListener - Flushed: 0 (re)creations, 0 updates, 0 removals to 0 collections
2350 [http-nio-8080-exec-4] DEBUG org.hibernate.internal.util.EntityPrinter - Listing entities:
2350 [http-nio-8080-exec-4] DEBUG org.hibernate.internal.util.EntityPrinter - com.Neo4jRestAPI.Person{firstname=Anna, gender=female, relationship_type=null, dob=10-10-1990, middlename=J, id=57, relationship=null, lastname=Smith}
2350 [http-nio-8080-exec-4] DEBUG org.apache.http.impl.conn.PoolingClientConnectionManager - Connection request: [route: {}->http://localhost:7474][total kept alive: 1; route allocated: 2 of 10; total allocated: 2 of 10]
2350 [http-nio-8080-exec-4] DEBUG org.apache.http.impl.conn.PoolingClientConnectionManager - Connection leased: [id: 1][route: {}->http://localhost:7474][total kept alive: 0; route allocated: 2 of 10; total allocated: 2 of 10]
2350 [http-nio-8080-exec-4] DEBUG org.apache.http.impl.client.DefaultHttpClient - Stale connection check
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.client.protocol.RequestAddCookies - CookieSpec selected: best-match
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.client.protocol.RequestAuthCache - Auth cache not set in the context
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.client.protocol.RequestProxyAuthentication - Proxy auth state: UNCHALLENGED
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.impl.client.DefaultHttpClient - Attempt 1 to execute request
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.impl.conn.DefaultClientConnection - Sending request: POST /db/data/transaction/54/commit HTTP/1.1
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - >> "POST /db/data/transaction/54/commit HTTP/1.1[\r][\n]"
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - >> "Accept: application/json[\r][\n]"
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - >> "Accept-Encoding: gzip, deflate[\r][\n]"
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - >> "Authorization: Basic bmVvNGo6Z2VuaXZpdHk=[\r][\n]"
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - >> "X-Stream: true[\r][\n]"
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - >> "Content-Length: 0[\r][\n]"
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - >> "Host: localhost:7474[\r][\n]"
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - >> "Connection: Keep-Alive[\r][\n]"
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - >> "[\r][\n]"
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - >> POST /db/data/transaction/54/commit HTTP/1.1
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - >> Accept: application/json
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - >> Accept-Encoding: gzip, deflate
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - >> Authorization: Basic bmVvNGo6Z2VuaXZpdHk=
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - >> X-Stream: true
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - >> Content-Length: 0
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - >> Host: localhost:7474
2352 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - >> Connection: Keep-Alive
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "HTTP/1.1 404 Not Found[\r][\n]"
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "Date: Tue, 03 Oct 2017 09:01:10 GMT[\r][\n]"
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "Content-Type: application/json[\r][\n]"
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "Access-Control-Allow-Origin: *[\r][\n]"
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "Content-Length: 178[\r][\n]"
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "Server: Jetty(9.2.z-SNAPSHOT)[\r][\n]"
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "[\r][\n]"
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.impl.conn.DefaultClientConnection - Receiving response: HTTP/1.1 404 Not Found
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - << HTTP/1.1 404 Not Found
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - << Date: Tue, 03 Oct 2017 09:01:10 GMT
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - << Content-Type: application/json
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - << Access-Control-Allow-Origin: *
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - << Content-Length: 178
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.headers - << Server: Jetty(9.2.z-SNAPSHOT)
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.impl.client.DefaultHttpClient - Connection can be kept alive indefinitely
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.wire - << "{"results":[],"errors":[{"code":"Neo.ClientError.Transaction.TransactionNotFound","message":"Unrecognized transaction id. Transaction may have timed out and been rolled back."}]}"
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.impl.conn.PoolingClientConnectionManager - Connection [id: 1][route: {}->http://localhost:7474] can be kept alive indefinitely
2354 [http-nio-8080-exec-4] DEBUG org.apache.http.impl.conn.PoolingClientConnectionManager - Connection released: [id: 1][route: {}->http://localhost:7474][total kept alive: 1; route allocated: 2 of 10; total allocated: 2 of 10]
2355 [http-nio-8080-exec-4] DEBUG org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl - Initiating JDBC connection release from afterTransaction
18718 [Finalizer] DEBUG org.apache.http.wire - << "{"password_change_required":false,"password_change":"http://localhost:7474/user/neo4j/password","username":"neo4j"}"
18719 [Finalizer] DEBUG org.apache.http.impl.conn.PoolingClientConnectionManager - Connection [id: 0][route: {}->http://localhost:7474] can be kept alive indefinitely
18719 [Finalizer] DEBUG org.apache.http.impl.conn.PoolingClientConnectionManager - Connection released: [id: 0][route: {}->http://localhost:7474][total kept alive: 2; route allocated: 2 of 10; total allocated: 2 of 10]
另外，我注意到的另一件事是，当我第一次发送JSON时，我在第二次发送之后得到上面的日志，当我第三次发送它时，每行都被打印两次，每行打印3次，依此类推......
我不确定是什么造成了这种情况，但可能是导致问题的原因
答案 0 :(得分：2)
我可以通过从tomcat 8.5更改为wildfly 9来解决我的问题。我仍然不确定tomcat的问题是什么，因为所有其他操作都运行正常，只是插入人员导致了问题。
答案 1 :(得分：0)
我认为，问题是
@GeneratedValue(strategy = GenerationType.AUTO)
无法找到创建密钥的适当方法。 我建议尝试这样的事情：
@SequenceGenerator(name = "sequence_generator_name", sequenceName = "sequence_name", allocationSize = 1)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sequence_generator_name")
使用数据库序列创建密钥。如果您不使用架构自动更新，则必须手动创建序列。语法细节取决于您的数据库。
答案 2 :(得分：0)
我想我发现了错误，改变了这些行：
em.persist(p);
em.flush();
tx.commit();
em.clear();
em.close();
emf.close();
通过这些方式：
em.persist(p);
em.flush();
em.close();
tx.commit();
emf.close();
答案 3 :(得分：0)
替换它：
catch ( Exception e ) {
e.printStackTrace();
}
用这个：
catch ( Exception e ) {
throw new RuntimeException(e);
}
异常不会被重新抛出，所以就你的REST层而言，PersonDAO.addPerson是成功的，它会产生一个OK响应。