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I recently upgraded a Spring Boot based application from Hibernate 4 to Hibernate 5. Since then I observe a class loading problem. Obviously, the hibernate classes and my domain class get loaded by two different class loaders. This only happens if I launch the application with Spring DevTools and Hibernate 5. The combinations DevTools/Hibernate 4, mvn spring-boot:run/Hibernate 5 work.
The problem can be reproduced with the following simple spring boot app (the full eclipse project is available 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>
Running this program with Spring DevTools results in the following error:
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'
390
There is an open issue for supporting Hibernate 5 with Spring Boot here.
In your example, there are two classloaders :
The default implement of Hibernate ClassLoaderService resolve classes by first looking in his own classloader, and then the spring classloader.
Your class are loaded by spring (with the restart classloader), given to hibernate through the persistent-unit, but hibernate reload this class with his ClassLoaderService, and find it in his own classloader (the system cl). There are two classes loaded, and the consequence is the error you saw.
Spring can be configured to load hibernate in the restart classloader, but i didn't success to isolate a set of libraries : adding only hibernate-* fail with errors from spring-orm or a EntityManager not visible from the proxybuilder.
A working workaround (but really ugly!) : add in META-INF/spring-devtools.properties
restart.include.all=.*
I suppose there is a better solution than this one
157
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