我正在使用wildfly和hibernate处理webapp。
以下是我的一些代码和配置文件。
hibernate.cfg.xml中：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory name="">
<property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
<property name="hibernate.connection.password">removed</property>
<property name="hibernate.connection.url">jdbc:postgresql:reportbuilderwebservices</property>
<property name="hibernate.connection.username">removed</property>
<property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.current_session_context_class">thread</property>
<property name="hibernate.format_sql">true</property>
<property name="hibernate.use_sql_comments">true</property>
<property name="hibernate.connection.pool_size">10</property>
<property name="hibernate.hbm2ddl.auto">create</property>
<mapping class="org.declercq.reportbuilderback.models.User"/>
<mapping class="org.declercq.reportbuilderback.models.Permission"/>
<mapping class="org.declercq.reportbuilderback.models.Role"/>
<mapping class="org.declercq.reportbuilderback.models.Vulnerability"/>
<mapping class="org.declercq.reportbuilderback.models.Finding"/>
</session-factory>
</hibernate-configuration>
我的模型类User.java带注释：
package org.declercq.reportbuilderback.models;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "users")
public class User implements Serializable {
private static final long serialVersionUID = 1L;
@Id @GeneratedValue
@Column(name="id")
private int id;
@Column(name="username")
private String userName;
@Column(name="password")
private String password;
@Column(name="email")
private String emailAddress;
public User(String userName, String password, String emailAddress) {
super();
this.userName = userName;
this.password = password;
this.emailAddress = emailAddress;
}
public User() {
super();
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmailAddress() {
return emailAddress;
}
public void setEmailAddress(String emailAddress) {
this.emailAddress = emailAddress;
}
}
我的DAO方法：
public List<User> getAllUsers(){
System.out.println("0");
Session session=HibernateUtil.getSessionFactory().getCurrentSession();
System.out.println("0,5");
Transaction tx = null;
List<User>allUsers=null;
try{
tx = session.beginTransaction();
System.out.println("1");
allUsers = session.createQuery("from User u").getResultList();
System.out.println("2");
tx.commit();
System.out.println("3");
}
catch(HibernateException e){
if(tx != null){
tx.rollback();
System.out.println("4");
}
return allUsers;
}
finally{
session.close();
System.out.println("5");
return allUsers;
}
}
我的hibernate.util：
package org.declercq.reportbuilderback.dao;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
private static final SessionFactory sessionFactory;
static {
try {
Configuration configuration = new Configuration().configure();
configuration.configure("hibernate.cfg.xml");
StandardServiceRegistryBuilder ssrb = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties());
sessionFactory = configuration.buildSessionFactory(ssrb.build());
} catch (Throwable ex) {
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
我的网络服务：
package org.declercq.reportbuilderback.webservices;
import java.util.List;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import org.declercq.reportbuilderback.dao.UserDao;
import org.declercq.reportbuilderback.models.User;
@Path("/userwebservice")
public class UserWebService {
@Path("/users")
@GET
@Produces("application/json")
public List<User> listUsers(){
System.out.println("HERE");
List<User>allUsers=new UserDao().getAllUsers();
System.out.println("Now here");
System.out.println("Size: "+allUsers.size());
return allUsers;
}
}
我的pom.xml：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>reportbuilderback</groupId>
<artifactId>org.declercq.reportbuilderback</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>3.0.19.Final</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-client</artifactId>
<version>3.0.19.Final</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>async-http-servlet-3.0</artifactId>
<version>3.0.19.Final</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>3.0.19.Final</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-multipart-provider</artifactId>
<version>3.0.19.Final</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.3.Final</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-all</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.4.1211.jre7</version>
</dependency>
</dependencies>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
</configuration>
</plugin>
</plugins>
</build>
</project>
我的服务器输出：
奇怪的是，如果你在控制台中查看我的输出（我使用system.out.println），DAO代码会从创建事务直接跳到关闭会话，它甚至不会构建我的查询。 结果当然是我的数据库查询结果为null，因此nullpointerexception。我理解这一点，但我不知道为什么DAO代码没有正确执行...... 我认为这是因为我的pom配置，编译时的库与来自wildfly的库，但我不知道...
更新1：
按照以下说明更改我的代码后：
@SuppressWarnings({ "unchecked", "deprecation" })
public List<User> getAllUsers(){
System.out.println("0");
Session session=HibernateUtil.getSessionFactory().getCurrentSession();
System.out.println("0,5");
Transaction tx = null;
List<User>allUsers=null;
try{
tx = session.beginTransaction();
System.out.println("1");
//allUsers = session.createQuery("select u from User u").getResultList();
allUsers=session.createCriteria(User.class).list();
System.out.println("2");
tx.commit();
System.out.println("3");
}
catch(HibernateException e){
if(tx != null){
tx.rollback();
System.out.println("4");
}
return allUsers;
}
finally{
session.close();
System.out.println("5");
return allUsers;
}
}
我现在得到以下输出：
08:32:37,957 INFO [org.jboss.modules] (main) JBoss Modules version 1.5.2.Final
08:32:38,350 INFO [org.jboss.msc] (main) JBoss MSC version 1.2.6.Final
08:32:38,467 INFO [org.jboss.as] (MSC service thread 1-8) WFLYSRV0049: WildFly Full 10.1.0.Final (WildFly Core 2.2.0.Final) starting
08:32:41,471 INFO [org.jboss.as.server.deployment.scanner] (DeploymentScanner-threads - 1) WFLYDS0004: Found org.declercq.reportbuilderback-0.0.1-SNAPSHOT.war in deployment directory. To trigger deployment create a file called org.declercq.reportbuilderback-0.0.1-SNAPSHOT.war.dodeploy
08:32:41,641 INFO [org.jboss.as.server] (Controller Boot Thread) WFLYSRV0039: Creating http management service using socket-binding (management-http)
08:32:41,715 INFO [org.xnio] (MSC service thread 1-6) XNIO version 3.4.0.Final
08:32:41,728 INFO [org.xnio.nio] (MSC service thread 1-6) XNIO NIO Implementation Version 3.4.0.Final
08:32:41,856 INFO [org.jboss.remoting] (MSC service thread 1-6) JBoss Remoting version 4.0.21.Final
08:32:41,958 INFO [org.jboss.as.clustering.infinispan] (ServerService Thread Pool -- 38) WFLYCLINF0001: Activating Infinispan subsystem.
08:32:41,990 INFO [org.jboss.as.jsf] (ServerService Thread Pool -- 44) WFLYJSF0007: Activated the following JSF Implementations: [main]
08:32:42,007 INFO [org.jboss.as.naming] (ServerService Thread Pool -- 46) WFLYNAM0001: Activating Naming Subsystem
08:32:42,059 WARN [org.jboss.as.txn] (ServerService Thread Pool -- 54) WFLYTX0013: Node identifier property is set to the default value. Please make sure it is unique.
08:32:42,097 INFO [org.wildfly.extension.io] (ServerService Thread Pool -- 37) WFLYIO001: Worker 'default' has auto-configured to 8 core threads with 64 task threads based on your 4 available processors
08:32:42,123 INFO [org.jboss.as.security] (ServerService Thread Pool -- 53) WFLYSEC0002: Activating Security Subsystem
08:32:42,126 INFO [org.jboss.as.webservices] (ServerService Thread Pool -- 56) WFLYWS0002: Activating WebServices Extension
08:32:42,175 INFO [org.jboss.as.connector] (MSC service thread 1-4) WFLYJCA0009: Starting JCA Subsystem (WildFly/IronJacamar 1.3.4.Final)
08:32:42,208 INFO [org.wildfly.extension.undertow] (MSC service thread 1-5) WFLYUT0003: Undertow 1.4.0.Final starting
08:32:42,213 INFO [org.jboss.as.security] (MSC service thread 1-6) WFLYSEC0001: Current PicketBox version=4.9.6.Final
08:32:42,473 INFO [org.jboss.as.naming] (MSC service thread 1-6) WFLYNAM0003: Starting Naming Service
08:32:42,477 INFO [org.jboss.as.mail.extension] (MSC service thread 1-7) WFLYMAIL0001: Bound mail session [java:jboss/mail/Default]
08:32:42,523 INFO [org.jboss.as.connector.subsystems.datasources] (ServerService Thread Pool -- 33) WFLYJCA0004: Deploying JDBC-compliant driver class org.h2.Driver (version 1.3)
08:32:42,535 INFO [org.jboss.as.connector.deployers.jdbc] (MSC service thread 1-8) WFLYJCA0018: Started Driver service with driver-name = h2
08:32:42,853 INFO [org.wildfly.extension.undertow] (ServerService Thread Pool -- 55) WFLYUT0014: Creating file handler for path '/home/wouter/wildfly-10.1.0.Final/welcome-content' with options [directory-listing: 'false', follow-symlink: 'false', case-sensitive: 'true', safe-symlink-paths: '[]']
08:32:42,889 INFO [org.wildfly.extension.undertow] (MSC service thread 1-8) WFLYUT0012: Started server default-server.
08:32:42,897 INFO [org.wildfly.extension.undertow] (MSC service thread 1-7) WFLYUT0018: Host default-host starting
08:32:43,108 INFO [org.jboss.as.ejb3] (MSC service thread 1-7) WFLYEJB0481: Strict pool slsb-strict-max-pool is using a max instance size of 64 (per class), which is derived from thread worker pool sizing.
08:32:43,109 INFO [org.jboss.as.ejb3] (MSC service thread 1-4) WFLYEJB0482: Strict pool mdb-strict-max-pool is using a max instance size of 16 (per class), which is derived from the number of CPUs on this host.
08:32:43,251 INFO [org.wildfly.extension.undertow] (MSC service thread 1-8) WFLYUT0006: Undertow HTTP listener default listening on 127.0.0.1:8080
08:32:43,729 INFO [org.jboss.as.connector.subsystems.datasources] (MSC service thread 1-8) WFLYJCA0001: Bound data source [java:jboss/datasources/ExampleDS]
08:32:44,048 WARN [org.jboss.as.domain.management.security] (MSC service thread 1-5) WFLYDM0111: Keystore /home/wouter/wildfly-10.1.0.Final/standalone/configuration/application.keystore not found, it will be auto generated on first use with a self signed certificate for host localhost
08:32:44,093 INFO [org.jboss.as.server.deployment.scanner] (MSC service thread 1-8) WFLYDS0013: Started FileSystemDeploymentService for directory /home/wouter/wildfly-10.1.0.Final/standalone/deployments
08:32:44,112 INFO [org.jboss.as.server.deployment] (MSC service thread 1-6) WFLYSRV0027: Starting deployment of "org.declercq.reportbuilderback-0.0.1-SNAPSHOT.war" (runtime-name: "org.declercq.reportbuilderback-0.0.1-SNAPSHOT.war")
08:32:44,508 INFO [org.infinispan.factories.GlobalComponentRegistry] (MSC service thread 1-4) ISPN000128: Infinispan version: Infinispan 'Chakra' 8.2.4.Final
08:32:44,547 INFO [org.wildfly.extension.undertow] (MSC service thread 1-8) WFLYUT0006: Undertow HTTPS listener https listening on 127.0.0.1:8443
08:32:44,617 INFO [org.infinispan.configuration.cache.EvictionConfigurationBuilder] (ServerService Thread Pool -- 64) ISPN000152: Passivation configured without an eviction policy being selected. Only manually evicted entities will be passivated.
08:32:44,614 INFO [org.infinispan.configuration.cache.EvictionConfigurationBuilder] (ServerService Thread Pool -- 60) ISPN000152: Passivation configured without an eviction policy being selected. Only manually evicted entities will be passivated.
08:32:44,621 INFO [org.infinispan.configuration.cache.EvictionConfigurationBuilder] (ServerService Thread Pool -- 60) ISPN000152: Passivation configured without an eviction policy being selected. Only manually evicted entities will be passivated.
08:32:44,616 INFO [org.infinispan.configuration.cache.EvictionConfigurationBuilder] (ServerService Thread Pool -- 65) ISPN000152: Passivation configured without an eviction policy being selected. Only manually evicted entities will be passivated.
08:32:44,623 INFO [org.infinispan.configuration.cache.EvictionConfigurationBuilder] (ServerService Thread Pool -- 65) ISPN000152: Passivation configured without an eviction policy being selected. Only manually evicted entities will be passivated.
08:32:44,633 INFO [org.infinispan.configuration.cache.EvictionConfigurationBuilder] (ServerService Thread Pool -- 64) ISPN000152: Passivation configured without an eviction policy being selected. Only manually evicted entities will be passivated.
08:32:44,841 INFO [org.jboss.ws.common.management] (MSC service thread 1-5) JBWS022052: Starting JBossWS 5.1.5.Final (Apache CXF 3.1.6)
08:32:47,678 INFO [org.jboss.weld.deployer] (MSC service thread 1-5) WFLYWELD0003: Processing weld deployment org.declercq.reportbuilderback-0.0.1-SNAPSHOT.war
08:32:47,783 INFO [org.hibernate.validator.internal.util.Version] (MSC service thread 1-5) HV000001: Hibernate Validator 5.2.4.Final
08:32:48,163 INFO [org.jboss.as.connector.deployers.jdbc] (MSC service thread 1-1) WFLYJCA0005: Deploying non-JDBC-compliant driver class org.postgresql.Driver (version 9.4)
08:32:48,236 INFO [org.jboss.weld.Version] (MSC service thread 1-1) WELD-000900: 2.3.5 (Final)
08:32:48,315 INFO [org.jboss.as.connector.deployers.jdbc] (MSC service thread 1-3) WFLYJCA0018: Started Driver service with driver-name = org.declercq.reportbuilderback-0.0.1-SNAPSHOT.war_org.postgresql.Driver_9_4
08:32:51,378 INFO [org.jboss.resteasy.resteasy_jaxrs.i18n] (ServerService Thread Pool -- 64) RESTEASY002225: Deploying javax.ws.rs.core.Application: class org.declercq.reportbuilderback.webservices.ConfigApp
08:32:51,429 INFO [org.wildfly.extension.undertow] (ServerService Thread Pool -- 64) WFLYUT0021: Registered web context: /org.declercq.reportbuilderback-0.0.1-SNAPSHOT
08:32:51,498 INFO [org.jboss.as.server] (ServerService Thread Pool -- 34) WFLYSRV0010: Deployed "org.declercq.reportbuilderback-0.0.1-SNAPSHOT.war" (runtime-name : "org.declercq.reportbuilderback-0.0.1-SNAPSHOT.war")
08:32:51,731 INFO [org.jboss.as] (Controller Boot Thread) WFLYSRV0060: Http management interface listening on http://127.0.0.1:9990/management
08:32:51,731 INFO [org.jboss.as] (Controller Boot Thread) WFLYSRV0051: Admin console listening on http://127.0.0.1:9990
08:32:51,732 INFO [org.jboss.as] (Controller Boot Thread) WFLYSRV0025: WildFly Full 10.1.0.Final (WildFly Core 2.2.0.Final) started in 14785ms - Started 476 of 724 services (404 services are lazy, passive or on-demand)
08:32:57,477 INFO [stdout] (default task-3) HERE
08:32:57,480 INFO [stdout] (default task-3) 0
08:32:57,639 INFO [org.hibernate.Version] (default task-3) HHH000412: Hibernate Core {5.2.3.Final}
08:32:57,641 INFO [org.hibernate.cfg.Environment] (default task-3) HHH000206: hibernate.properties not found
08:32:57,644 INFO [org.hibernate.cfg.Environment] (default task-3) HHH000021: Bytecode provider name : javassist
08:32:58,527 INFO [org.hibernate.annotations.common.Version] (default task-3) HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
08:32:58,725 WARN [org.hibernate.orm.connections.pooling] (default task-3) HHH10001002: Using Hibernate built-in connection pool (not for production use!)
08:32:58,727 INFO [org.hibernate.orm.connections.pooling] (default task-3) HHH10001005: using driver [org.postgresql.Driver] at URL [jdbc:postgresql:reportbuilderwebservices]
08:32:58,729 INFO [org.hibernate.orm.connections.pooling] (default task-3) HHH10001001: Connection properties: {user=reportbuilderwebservices, password=****}
08:32:58,730 INFO [org.hibernate.orm.connections.pooling] (default task-3) HHH10001003: Autocommit mode: false
08:32:58,734 INFO [org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl] (default task-3) HHH000115: Hibernate connection pool size: 10 (min=1)
08:32:58,844 INFO [org.hibernate.dialect.Dialect] (default task-3) HHH000400: Using dialect: org.hibernate.dialect.PostgreSQLDialect
08:32:59,106 INFO [org.hibernate.engine.jdbc.env.internal.LobCreatorBuilderImpl] (default task-3) HHH000424: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException
08:32:59,109 INFO [org.hibernate.type.BasicTypeRegistry] (default task-3) HHH000270: Type registration [java.util.UUID] overrides previous : org.hibernate.type.UUIDBinaryType@48ea9b0e
08:32:59,449 INFO [org.hibernate.tool.schema.internal.SchemaCreatorImpl] (default task-3) HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl@43b645ed'
08:32:59,632 INFO [stdout] (default task-3) 0,5
08:32:59,636 INFO [stdout] (default task-3) 1
08:32:59,640 WARN [org.hibernate.orm.deprecation] (default task-3) HHH90000022: Hibernate's legacy org.hibernate.Criteria API is deprecated; use the JPA javax.persistence.criteria.CriteriaQuery instead
08:32:59,653 INFO [stdout] (default task-3) 2
08:32:59,657 INFO [stdout] (default task-3) 3
08:32:59,658 INFO [stdout] (default task-3) 5
08:32:59,659 INFO [stdout] (default task-3) Now here
08:32:59,660 INFO [stdout] (default task-3) Size: 0
所以，这里有2个问题：1）由于某种原因，这会执行而前一个createQuery方法没有。我真的想知道为什么，因为这种方式（使用标准）显然已被弃用。 2）最重要的原因：我打印出所有用户的大小，大小为0，这是绝对不可能的，因为在该用户表中添加了3个用户帐户。
有人可以协助吗？
谢谢！
答案 0 :(得分：1)
createQuery返回null，这通常意味着查询字符串有问题。你可以尝试，例如：
allUsers = session.createQuery("from User").getResultList();
或符合JPA的方式：
allUsers = session.createQuery("select u from User u").getResultList();
或没有hql：
allUsers = session.createCriteria(User.class).list();