目前我正在学习Java EE和我有JPA的一个问题。它看起来像Hibernate是找不到我的表称为“类别”（虽然它肯定存在！）。我不相信这是与命名一个问题，因为我甚至想明确设置实体表名。
我使用的是GlassFish（似鲭水狼牙鱼）作为我的服务器。
如果有人能发现问题也将是惊人的。
顺便说一句，应该调用私人无效me.yanik.booksyanik.CategoryEditor.init（）（如异常状态），没有问题。
除了堆栈跟踪和我所提供的源代码，3类persistence.xml文件我现在和我的pom.xml。
堆栈跟踪：
org.jboss.weld.exceptions.WeldException: WELD-000049: Unable to invoke private void me.yanik.booksyanik.CategoryEditor.init() on me.yanik.booksyanik.CategoryEditor@1a5c558f
at org.jboss.weld.injection.producer.DefaultLifecycleCallbackInvoker.invokeMethods(DefaultLifecycleCallbackInvoker.java:85)
at org.jboss.weld.injection.producer.DefaultLifecycleCallbackInvoker.postConstruct(DefaultLifecycleCallbackInvoker.java:66)
at org.jboss.weld.injection.producer.BasicInjectionTarget.postConstruct(BasicInjectionTarget.java:122)
at org.jboss.weld.bean.ManagedBean.create(ManagedBean.java:162)
at org.jboss.weld.util.bean.IsolatedForwardingBean.create(IsolatedForwardingBean.java:45)
at org.jboss.weld.contexts.AbstractContext.get(AbstractContext.java:96)
at org.jboss.weld.contexts.PassivatingContextWrapper$AbstractPassivatingContextWrapper.get(PassivatingContextWrapper.java:76)
at org.jboss.weld.bean.ContextualInstanceStrategy$DefaultContextualInstanceStrategy.get(ContextualInstanceStrategy.java:100)
at org.jboss.weld.bean.ContextualInstanceStrategy$CachingContextualInstanceStrategy.get(ContextualInstanceStrategy.java:177)
at org.jboss.weld.bean.ContextualInstance.get(ContextualInstance.java:50)
at org.jboss.weld.manager.BeanManagerImpl.getReference(BeanManagerImpl.java:700)
at org.jboss.weld.module.web.el.AbstractWeldELResolver.lookup(AbstractWeldELResolver.java:107)
at org.jboss.weld.module.web.el.AbstractWeldELResolver.getValue(AbstractWeldELResolver.java:90)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:188)
at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:180)
at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:208)
at com.sun.el.parser.AstIdentifier.getValue(AstIdentifier.java:116)
at com.sun.el.parser.AstValue.getBase(AstValue.java:151)
at com.sun.el.parser.AstValue.getValue(AstValue.java:200)
at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:226)
at org.jboss.weld.module.web.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:97)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:181)
at javax.faces.component.UIData.getValue(UIData.java:760)
at javax.faces.component.UIData.getDataModel(UIData.java:1873)
at javax.faces.component.UIData.setRowIndexWithoutRowStatePreserved(UIData.java:503)
at javax.faces.component.UIData.setRowIndex(UIData.java:492)
at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:81)
at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:564)
at javax.faces.component.UIData.encodeBegin(UIData.java:1177)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1667)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:590)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1670)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1673)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1673)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:492)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:194)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:156)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:126)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:223)
at javax.faces.webapp.FacesServlet.executeLifecyle(FacesServlet.java:732)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:475)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1628)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:258)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:755)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:575)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:159)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:371)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:238)
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:520)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:217)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:182)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:156)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:218)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:95)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:260)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:177)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:109)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:88)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:53)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:524)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:89)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:94)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:33)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:114)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:569)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:549)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.jboss.weld.injection.producer.DefaultLifecycleCallbackInvoker.invokeMethods(DefaultLifecycleCallbackInvoker.java:83)
... 72 more
Caused by: javax.ejb.EJBException
at com.sun.ejb.containers.EJBContainerTransactionManager.processSystemException(EJBContainerTransactionManager.java:750)
at com.sun.ejb.containers.EJBContainerTransactionManager.completeNewTx(EJBContainerTransactionManager.java:700)
at com.sun.ejb.containers.EJBContainerTransactionManager.postInvokeTx(EJBContainerTransactionManager.java:505)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4664)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2131)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2101)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:220)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:90)
at com.sun.proxy.$Proxy287.findAll(Unknown Source)
at me.yanik.booksyanik.__EJB31_Generated__CategoryService__Intf____Bean__.findAll(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.jboss.weld.util.reflection.Reflections.invokeAndUnwrap(Reflections.java:410)
at org.jboss.weld.module.ejb.EnterpriseBeanProxyMethodHandler.invoke(EnterpriseBeanProxyMethodHandler.java:134)
at org.jboss.weld.bean.proxy.EnterpriseTargetBeanInstance.invoke(EnterpriseTargetBeanInstance.java:56)
at org.jboss.weld.module.ejb.InjectionPointPropagatingEnterpriseTargetBeanInstance.invoke(InjectionPointPropagatingEnterpriseTargetBeanInstance.java:68)
at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:106)
at me.yanik.booksyanik.CategoryService$Proxy$_$$_Weld$EnterpriseProxy$.findAll(Unknown Source)
at me.yanik.booksyanik.CategoryEditor.init(CategoryEditor.java:28)
... 77 more
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not prepare statement
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:154)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:181)
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1538)
at org.hibernate.query.Query.getResultList(Query.java:168)
at org.hibernate.query.criteria.internal.compile.CriteriaQueryTypeQueryAdapter.getResultList(CriteriaQueryTypeQueryAdapter.java:76)
at me.yanik.booksyanik.CategoryService.findAll(CategoryService.java:54)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:953)
at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1017)
at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4884)
at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:656)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:836)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:895)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:835)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:608)
at org.jboss.weld.module.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:72)
at org.jboss.weld.module.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:52)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:895)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:835)
at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:374)
at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4856)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4844)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:212)
... 91 more
Caused by: org.hibernate.exception.GenericJDBCException: could not prepare statement
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:47)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:182)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:148)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1990)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1920)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1898)
at org.hibernate.loader.Loader.doQuery(Loader.java:937)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:340)
at org.hibernate.loader.Loader.doList(Loader.java:2695)
at org.hibernate.loader.Loader.doList(Loader.java:2678)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2512)
at org.hibernate.loader.Loader.list(Loader.java:2507)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:504)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:396)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:224)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1511)
at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1561)
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1529)
... 125 more
Caused by: java.sql.SQLException: java.lang.reflect.UndeclaredThrowableException
at com.sun.gjc.spi.jdbc40.ProfiledConnectionWrapper40.prepareStatement(ProfiledConnectionWrapper40.java:247)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:146)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:172)
... 141 more
Caused by: java.lang.reflect.UndeclaredThrowableException
at com.sun.proxy.$Proxy281.prepareStatement(Unknown Source)
at com.sun.gjc.spi.base.ConnectionHolder.prepareStatement(ConnectionHolder.java:586)
at com.sun.gjc.spi.jdbc40.ProfiledConnectionWrapper40.prepareCachedStatement(ProfiledConnectionWrapper40.java:372)
at com.sun.gjc.spi.jdbc40.ProfiledConnectionWrapper40.prepareCachedStatement(ProfiledConnectionWrapper40.java:66)
at com.sun.gjc.spi.ManagedConnectionImpl.prepareCachedStatement(ManagedConnectionImpl.java:1071)
at com.sun.gjc.spi.jdbc40.ProfiledConnectionWrapper40.prepareStatement(ProfiledConnectionWrapper40.java:243)
... 143 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.gjc.spi.JdbcObjectsFactory$1.invoke(JdbcObjectsFactory.java:143)
... 149 more
Caused by: org.h2.jdbc.JdbcSQLException: Table "CATEGORY" not found; SQL statement:
select category0_.id as id1_0_, category0_.name as name2_0_ from Category category0_ [42102-196]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)
at org.h2.message.DbException.get(DbException.java:179)
at org.h2.message.DbException.get(DbException.java:155)
at org.h2.command.Parser.readTableOrView(Parser.java:5552)
at org.h2.command.Parser.readTableFilter(Parser.java:1266)
at org.h2.command.Parser.parseSelectSimpleFromPart(Parser.java:1946)
at org.h2.command.Parser.parseSelectSimple(Parser.java:2095)
at org.h2.command.Parser.parseSelectSub(Parser.java:1940)
at org.h2.command.Parser.parseSelectUnion(Parser.java:1755)
at org.h2.command.Parser.parseSelect(Parser.java:1743)
at org.h2.command.Parser.parsePrepared(Parser.java:449)
at org.h2.command.Parser.parse(Parser.java:321)
at org.h2.command.Parser.parse(Parser.java:293)
at org.h2.command.Parser.prepareCommand(Parser.java:258)
at org.h2.engine.Session.prepareLocal(Session.java:578)
at org.h2.engine.Session.prepareCommand(Session.java:519)
at org.h2.jdbc.JdbcConnection.prepareCommand(JdbcConnection.java:1204)
at org.h2.jdbc.JdbcPreparedStatement.<init>(JdbcPreparedStatement.java:73)
at org.h2.jdbc.JdbcConnection.prepareStatement(JdbcConnection.java:677)
... 154 more
persistence.xml中：
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.2"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_2.xsd">
<persistence-unit name="bookspu" >
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL8Dialect" />
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://127.0.0.1:3306/books" />
<property name="javax.persistence.jdbc.user" value="bookuser" />
<property name="javax.persistence.jdbc.password" value="password" />
</properties>
</persistence-unit>
</persistence>
category.Java
package me.yanik.booksyanik;
import javax.persistence.*;
import java.io.Serializable;
import java.util.Objects;
@Entity
@Table(name = "category")
public class Category implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id = -1;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Category category = (Category) o;
return id == category.id &&
Objects.equals(name, category.name);
}
@Override
public int hashCode() {
return Objects.hash(id, name);
}
@Override
public String toString() {
return "Category{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
}
category editor.Java
package me.yanik.booksyanik;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import javax.annotation.PostConstruct;
import javax.enterprise.context.SessionScoped;
import javax.inject.Inject;
import javax.inject.Named;
@Named
@SessionScoped
public class CategoryEditor implements Serializable {
private static final long serialVersionUID = 1L;
private static final Logger logger = Logger.
getLogger("CategoryEditor");
private List<Category> categories;
private List<Category> deletedCategories;
@Inject CategoryService categoryService;
@PostConstruct
private void init() {
categories = categoryService.findAll();
deletedCategories = new ArrayList<>();
}
public List<Category> getCategories() {
return categories;
}
public void setCategories(List<Category> categories) {
this.categories = categories;
}
public String addCategory() {
categories.add(new Category());
return "";
}
public String deleteCategory(Category category) {
if (category.getId() >= 0) {
deletedCategories.add(category);
}
categories.remove(category);
return "";
}
public String save() {
for (Category category: categories) {
categoryService.save((category));
}
for (Category category: deletedCategories) {
categoryService.delete(category);
}
deletedCategories = new ArrayList<>();
return "";
}
}
category service.Java
package me.yanik.booksyanik;
import java.io.Serializable;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.criteria.CriteriaQuery;
@Stateless
public class CategoryService {
@PersistenceContext(unitName = "bookspu")
private EntityManager em;
protected EntityManager getEntityManager() {
return em;
}
public Category create(Category entity) {
getEntityManager().persist(entity);
return entity;
}
public Category read(Object id) {
return getEntityManager().find(Category.class, id);
}
public Category update(Category entity) {
return getEntityManager().merge(entity);
}
public void delete(Category entity) {
getEntityManager().remove(getEntityManager().merge(entity));
}
/**
* Convenience method, to create or update automatically
*
* @param entity
* @return managed entity
*/
public Category save(Category entity) {
if (entity.getId() < 0) {
return create(entity);
}
return update(entity);
}
public List<Category> findAll() {
CriteriaQuery cq = getEntityManager().getCriteriaBuilder().
createQuery();
cq.select(cq.from(Category.class));
return getEntityManager().createQuery(cq).getResultList();
}
}
pom.hml：
<?xml version="1.0" encoding="UTF-8"?>
<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>me.yanik</groupId>
<artifactId>BooksYanik</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>BooksYanik</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.4.0.Final</version>
</dependency>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>8.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.11</version>
</dependency>
</dependencies>
</project>
一些MySQL的命令：
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| books |
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
mysql> show tables;
+-----------------+
| Tables_in_books |
+-----------------+
| category |
+-----------------+
mysql> select User from mysql.user;
+------------------+
| User |
+------------------+
| bookuser |
| mysql.infoschema |
| mysql.session |
| mysql.sys |
| root |
+------------------+
我可以从H2被用作数据源的报道堆栈跟踪看到，但是从你的persistence.xml您指定MySQL作为您的JPA方言。
如果容器配置好，你会发现你的配置MySQL数据源的JNDI名称，姑且称之为dataSource。
从那里，你可以通过增加你的持久单元标签上的标签下方修改您的persistence.xml：
<jta-data-source>dataSource</jta-data-source>
我猜你需要提下具有持久性单元部分在persistent.xml你的Hibernate实体
<persistent-unit>
<class>me.yanik.booksyanik.Category</class>
...
</persistent-unit>
你需要添加到您的主类还检查是否正在使用的弹簧启动
@EntityScan(basepackage={me.yanik.*})
如果你在春天给人明确的配置，那么你需要添加配置类相同
最后，我发现了一个回答我的问题！有几件事我做错了，我是不知道的。
如果您使用的是Java EE，你不指定在transaction-type文件persistence-unit的persistence.xml，它默认为transaction-type="JTA"。同样，如果你使用的是Java SE和你没有指定transaction-type，则默认为transaction-type="RESOURCE_LOCAL"。
因此，在这种情况下，我是使用Java EE这意味着transaction-type默认为JTA。而不指定jta-data-source，正在使用的默认数据源（EJB容器上jdbc/__default）。这个默认的数据源是H2的数据源。
我已经建立了在persistence.xml文件直接MySQL JDBC驱动程序连接。因此，我以为我连接到它。但是，默认H2数据源实际上是被用来代替。由于我的表是在MySQL数据库中，而不是在H2数据库，没有被发现我的表。
我学到的是，如果我使用Java EE，我应该使用JTA数据源，而不必直接JDBC驱动程序连接。这提供了像连接池和EntityManager的注入一些优势
话虽如此，我带来了一些改变，我persistence.xml文件。另外，我已经创造了一个glassfish-resources.xml文件src/main/setup，因为我使用Maven标准的目录结构。此文件加载每当我部署使用NetBeans的web应用适当的JDBC资源。请注意，使用MySQL8，数据源类名称应com.mysql.cj.jdbc.MysqlConnectionPoolDataSource代替com.mysql.jdbc.jdbc2.optional.MysqlDataSource。另外，如果你没有在你的开发环境?useSSL=false参数使用SSL需要被添加到JDBC URL。
下面是与修改的文件列表。
persistence.xml中
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.2"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_2.xsd">
<persistence-unit name="bookspu" transaction-type="JTA">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<jta-data-source>jdbc/books</jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL8Dialect" />
</properties>
</persistence-unit>
</persistence>
与GlassFish resources.xml中
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE resources PUBLIC "-//GlassFish.org//DTD GlassFish Application Server 3.1 Resource Definitions//EN"
"http://glassfish.org/dtds/glassfish-resources_1_5.dtd">
<resources>
<jdbc-resource enabled="true"
jndi-name="jdbc/books"
object-type="user"
pool-name="mysql_Books_booksPool"/>
<jdbc-connection-pool allow-non-component-callers="false" associate-with-thread="false"
connection-creation-retry-attempts="0" connection-creation-retry-interval-in-seconds="10"
connection-leak-reclaim="false" connection-leak-timeout-in-seconds="0"
connection-validation-method="auto-commit"
datasource-classname="com.mysql.cj.jdbc.MysqlConnectionPoolDataSource"
fail-all-connections="false" idle-timeout-in-seconds="300"
is-connection-validation-required="false" is-isolation-level-guaranteed="true"
lazy-connection-association="false" lazy-connection-enlistment="false"
match-connections="false" max-connection-usage-count="0" max-pool-size="32"
max-wait-time-in-millis="60000" name="mysql_Books_booksPool"
non-transactional-connections="false" pool-resize-quantity="2" res-type="javax.sql.DataSource"
statement-timeout-in-seconds="-1" steady-pool-size="8"
validate-atmost-once-period-in-seconds="0" wrap-jdbc-objects="false">
<property name="serverName" value="127.0.0.1"/>
<property name="portNumber" value="3306"/>
<property name="databaseName" value="books"/>
<property name="User" value="bookuser"/>
<property name="Password" value="password"/>
<property name="URL" value="jdbc:mysql://127.0.0.1:3306/Books?useSSL=false"/>
<property name="driverClass" value="com.mysql.jdbc.Driver"/>
</jdbc-connection-pool>
</resources>