java-Spring Boot和Hibernate 5的类加载错误
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我最近将基于Spring Boot的应用程序从Hibernate 4升级到了Hibernate5.此后,我观察到类加载问题.显然,休眠类和我的域类是由两个不同的类加载器加载的.仅当我使用Spring DevTools和Hibernate 5启动应用程序时,才会发生这种情况.DevTools / Hibernate 4,mvn spring-boot：run / Hibernate 5组合可以正常工作.
可以使用以下简单的Spring Boot应用程序重现该问题(完整的Eclipse项目可用here)
@Entity
public class Employee implements Serializable {
private static final long serialVersionUID = 1L;
private Long id;
private String firstName;
private String lastName;
public Employee() {
}
public Employee(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
@Id @GeneratedValue
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String toString() {
return id + ": " + lastName + ", " + firstName;
}
}
public class AppConfig {
@Autowired
private DataSource dataSource;
@SuppressWarnings("serial")
@Bean
public LocalSessionFactoryBean sessionFactory() {
LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
sessionFactory.setDataSource(dataSource);
sessionFactory.setPackagesToScan("problem.domain");
sessionFactory.setHibernateProperties(new Properties() {
{
setProperty("hibernate.dialect", "org.hibernate.dialect.DerbyTenSevenDialect");
setProperty("hibernate.hbm2ddl.auto", "create-drop");
setProperty("hibernate.current_session_context_class", "thread");
}
});
return sessionFactory;
}
}
@Component
public class DatabaseInitializer implements ApplicationRunner {
@Autowired
private SessionFactory sessionFactory;
@Override
public void run(ApplicationArguments args) throws Exception {
Session session = sessionFactory.getCurrentSession();
Transaction tx = session.beginTransaction();
Employee empl = new Employee("John", "Doe");
session.persist(empl);
tx.commit();
}
}
@SpringBootApplication
public class SpringBootMain {
public static void main(String[] args) throws Exception {
SpringApplication.run(SpringBootMain.class, args);
}
}
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>swt6.spring</groupId>
<artifactId>hibernate5-problem</artifactId>
<packaging>jar</packaging>
<version>1.0.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.2.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
<hibernate.version>5.1.0.Final</hibernate.version>
<derby.version>10.12.1.1</derby.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
使用Spring DevTools运行该程序会导致以下错误：
2016-02-15 18:30:48.315 INFO 13828 --- [ restartedMain] o.h.t.schema.internal.SchemaCreatorImpl : HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl@55ad1b60'
2016-02-15 18:30:48.509 INFO 13828 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2016-02-15 18:30:48.536 INFO 13828 --- [ restartedMain] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2016-02-15 18:30:48.582 ERROR 13828 --- [ restartedMain] o.h.p.access.spi.GetterMethodImpl : HHH000122: IllegalArgumentException in class: problem.domain.Employee, getter method of property: id
2016-02-15 18:30:48.583 ERROR 13828 --- [ restartedMain] o.s.boot.SpringApplication : Application startup failed
java.lang.IllegalStateException: Failed to execute ApplicationRunner
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:800) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:787) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:777) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:308) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at problem.main.SpringBootMain.main(SpringBootMain.java:10) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_66]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_66]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_66]
at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_66]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-1.3.2.RELEASE.jar:1.3.2.RELEASE]
Caused by: org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of problem.domain.Employee.id
at org.hibernate.property.access.spi.GetterMethodImpl.get(GetterMethodImpl.java:64) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:223) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4633) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:4344) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at org.hibernate.engine.internal.ForeignKeys.isTransient(ForeignKeys.java:226) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at org.hibernate.event.internal.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:499) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:99) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:58) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:778) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:751) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:756) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_66]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_66]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_66]
at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_66]
at org.hibernate.context.internal.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:338) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
at com.sun.proxy.$Proxy56.persist(Unknown Source) ~[na:na]
at problem.main.DatabaseInitializer.run(DatabaseInitializer.java:24) ~[classes/:na]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:797) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
... 11 common frames omitted
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_66]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_66]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_66]
at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_66]
at org.hibernate.property.access.spi.GetterMethodImpl.get(GetterMethodImpl.java:41) ~[hibernate-core-5.1.0.Final.jar:5.1.0.Final]
... 29 common frames omitted
2016-02-15 18:30:48.585 INFO 13828 --- [ restartedMain] .b.l.ClasspathLoggingApplicationListener : Application failed to start with classpath: [file:/D:/P20058/Documents/FH/Lehre/SWT6U/Uebungen/SpringWeb/hibernate5-problem/target/classes/]
2016-02-15 18:30:48.585 INFO 13828 --- [ restartedMain] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report enable debug logging (start with --debug)
2016-02-15 18:30:48.585 INFO 13828 --- [ restartedMain] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@63e38bca: startup date [Mon Feb 15 18:30:46 CET 2016]; root of context hierarchy
2016-02-15 18:30:48.587 INFO 13828 --- [ restartedMain] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown
2016-02-15 18:30:48.587 INFO 13828 --- [ restartedMain] .SchemaDropperImpl$DelayedDropActionImpl : HHH000477: Starting delayed drop of schema as part of SessionFactory shut-down'
2016-02-15 18:30:48.604 INFO 13828 --- [ restartedMain] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2016-02-15 18:30:48.604 INFO 13828 --- [ restartedMain] .SchemaDropperImpl$DelayedDropActionImpl : HHH000477: Starting delayed drop of schema as part of SessionFactory shut-down'
解决方法:
使用Spring Boot here支持Hibernate 5有一个未解决的问题.
在您的示例中,有两个类加载器：
>系统类加载器
> Spring Boot DevTools类加载器,支持重启功能
Hibernate ClassLoaderService的默认实现是先查看自己的类加载器,然后查看spring类加载器来解析类.
您的类是通过spring(使用重新启动类加载器)加载的,并通过持久性单元进入休眠状态,但是hibernate用他的ClassLoaderService重新加载该类,并在自己的类加载器(系统cl)中找到它.加载了两个类,其结果是您看到的错误.
可以将Spring配置为在重新启动的类加载器中加载休眠模式,但是我未能成功地隔离出一组库：仅添加hibernate- *失败,并出现spring-orm或ProxyManager中看不到的EntityManager的错误.
一个可行的解决方法(但确实很丑！)：在META-INF / spring-devtools.properties中添加
restart.include.all=.*
我想有一个比这更好的解决方案
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