我有以下JPA实体（使用Netbeans生成）：
package com.tsystems.tf.db.models;
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.Date;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.xml.bind.annotation.XmlRootElement;
/**
*
* @author johorvat
*/
@Entity
@Table(name = "TABLE1")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Testcase.findAll", query = "SELECT t FROM Testcase t")
})
public class Testcase implements Serializable {
private static final long serialVersionUID = 1L;
// @Max(value=?) @Min(value=?)//if you know range of your decimal fields consider using these annotations to enforce field validation
@Id
@Basic(optional = false)
@Column(name = "TESTCASE_ID")
private BigDecimal testcaseId;
@Basic(optional = false)
@Column(name = "TESTCASE_NAME")
private String testcaseName;
@Basic(optional = false)
@Column(name = "CREATOR")
private String creator;
@Basic(optional = false)
@Column(name = "CREATED_AT")
@Temporal(TemporalType.TIMESTAMP)
private Date createdAt;
@Column(name = "LAST_RUN")
@Temporal(TemporalType.TIMESTAMP)
private Date lastRun;
@Column(name = "LAST_RUN_RESULT")
private Character lastRunResult;
@Column(name = "INPUT")
private String input;
@Column(name = "OUTPUT")
private String output;
public Testcase() {
}
public Testcase(BigDecimal testcaseId) {
this.testcaseId = testcaseId;
}
public Testcase(BigDecimal testcaseId, String testcaseName, String creator, Date createdAt) {
this.testcaseId = testcaseId;
this.testcaseName = testcaseName;
this.creator = creator;
this.createdAt = createdAt;
}
public BigDecimal getTestcaseId() {
return testcaseId;
}
public void setTestcaseId(BigDecimal testcaseId) {
this.testcaseId = testcaseId;
}
public String getTestcaseName() {
return testcaseName;
}
public void setTestcaseName(String testcaseName) {
this.testcaseName = testcaseName;
}
public String getCreator() {
return creator;
}
public void setCreator(String creator) {
this.creator = creator;
}
public Date getCreatedAt() {
return createdAt;
}
public void setCreatedAt(Date createdAt) {
this.createdAt = createdAt;
}
public Date getLastRun() {
return lastRun;
}
public void setLastRun(Date lastRun) {
this.lastRun = lastRun;
}
public Character getLastRunResult() {
return lastRunResult;
}
public void setLastRunResult(Character lastRunResult) {
this.lastRunResult = lastRunResult;
}
public String getInput() {
return input;
}
public void setInput(String input) {
this.input = input;
}
public String getOutput() {
return output;
}
public void setOutput(String output) {
this.output = output;
}
@Override
public int hashCode() {
int hash = 0;
hash += (testcaseId != null ? testcaseId.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Testcase)) {
return false;
}
Testcase other = (Testcase) object;
if ((this.testcaseId == null && other.testcaseId != null) || (this.testcaseId != null && !this.testcaseId.equals(other.testcaseId))) {
return false;
}
return true;
}
@Override
public String toString() {
return "com.tsystems.tf.db.models.Testcase[ testcaseId=" + testcaseId + " ]";
}
}
我尝试使用Hibernate为这个实体实现CRUD操作，但是我得到了LazyEvaluationException。没有参考。它在数据库中只有1个表...我可以查询但是当我尝试发布更新时，异常被抛出。现在我有一个非常天真的实现，如下所示：
package com.tsystems.tf.dao.impl;
import com.tsystems.tf.dao.ITestcaseDAO;
import com.tsystems.tf.db.models.Testcase;
import java.math.BigDecimal;
import java.util.Collection;
import javax.transaction.Transactional;
import org.apache.catalina.tribes.util.Arrays;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.jboss.logging.Logger;
public class TestcaseDAOImpl implements ITestcaseDAO {
private static final SessionFactory sessionFactory;
static {
Configuration configuration = new Configuration();
configuration = configuration.configure();
StandardServiceRegistryBuilder registryBuilder = new StandardServiceRegistryBuilder();
registryBuilder = registryBuilder.applySettings(configuration.getProperties());
StandardServiceRegistry registry = registryBuilder.build();
sessionFactory = configuration.buildSessionFactory(registry);
}
@Override
public Collection<Testcase> getAllTestcase() {
Session session = sessionFactory.openSession();
Transaction transaction = null;
Collection<Testcase> testcaseCollection = null;
try {
transaction = session.beginTransaction();
Query query = session.getNamedQuery("Testcase.findAll");
testcaseCollection = query.list();
transaction.commit();
} catch (final HibernateException ex) {
Logger.getLogger(TestcaseDAOImpl.class)
.error(ex.getMessage() + "\n" + Arrays.toString(ex.getStackTrace()));
if (transaction != null)
transaction.rollback();
}
session.close();
return testcaseCollection;
}
@Override
public void createTestcase(Testcase testcase) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public Testcase readTestcase(BigDecimal id) {
Session session = sessionFactory.openSession();
Transaction transaction = null;
Testcase testcase = null;
try {
transaction = session.beginTransaction();
testcase = (Testcase) session.load(Testcase.class, id);
transaction.commit();
} catch (final HibernateException ex) {
Logger.getLogger(TestcaseDAOImpl.class)
.error(ex.getMessage() + "\n" + Arrays.toString(ex.getStackTrace()));
if (transaction != null)
transaction.rollback();
}
session.close();
return testcase;
}
@Override
public void updateTestcase(Testcase testcase) {
Session session = sessionFactory.openSession();
Transaction transaction = null;
try {
transaction = session.beginTransaction();
session.update(testcase);
transaction.commit();
} catch (final HibernateException ex) {
Logger.getLogger(TestcaseDAOImpl.class)
.error(ex.getMessage() + "\n" + Arrays.toString(ex.getStackTrace()));
if (transaction != null)
transaction.rollback();
}
session.close();
}
@Override
public void deleteTestcase(BigDecimal testcaseId) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
}
当更新被称为bamm No Session时。为什么会这样？ GetAll成功顺利，但这就是它的全部。在我的日志中，其他所有内容都返回No Session错误。
堆栈跟踪：
14-Nov-2014 16:54:43.012 WARNING [http-apr-8080-exec-148] com.sun.faces.context.SessionMap.put JSF1063: WARNING! Setting non-serializable attribute value into HttpSession (key: testcaseProvider, value class: com.tsystems.tf.beans.TestcaseProvider).
14-Nov-2014 16:54:46.812 WARNING [http-apr-8080-exec-148] com.sun.faces.lifecycle.InvokeApplicationPhase.execute #{testcaseProvider.updateTestcase()}: org.hibernate.LazyInitializationException: could not initialize proxy - no Session
javax.faces.FacesException: #{testcaseProvider.updateTestcase()}: org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2403)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2392)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.faces.el.EvaluationException: org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
... 29 more
Caused by: org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:164)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:285)
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:185)
at com.tsystems.tf.db.models.Testcase_$$_jvsta1c_0.setTestcaseName(Testcase_$$_jvsta1c_0.java)
at com.tsystems.tf.beans.TestcaseProvider.updateTestcase(TestcaseProvider.java:60)
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:483)
at org.apache.el.parser.AstValue.invoke(AstValue.java:245)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:277)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
... 30 more
14-Nov-2014 16:54:46.832 SEVERE [http-apr-8080-exec-148] com.sun.faces.context.AjaxExceptionHandlerImpl.handlePartialResponseError javax.faces.el.EvaluationException: org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2403)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2392)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:164)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:285)
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:185)
at com.tsystems.tf.db.models.Testcase_$$_jvsta1c_0.setTestcaseName(Testcase_$$_jvsta1c_0.java)
at com.tsystems.tf.beans.TestcaseProvider.updateTestcase(TestcaseProvider.java:60)
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:483)
at org.apache.el.parser.AstValue.invoke(AstValue.java:245)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:277)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
... 30 more
答案 0 :(得分：0)
用before（）方法替换静态块，并在其末尾添加会话创建：
@Before
public void before() {
Configuration configuration = new Configuration();
configuration = configuration.configure();
StandardServiceRegistryBuilder registryBuilder = new StandardServiceRegistryBuilder();
registryBuilder = registryBuilder.applySettings(configuration.getProperties());
StandardServiceRegistry registry = registryBuilder.build();
sessionFactory = configuration.buildSessionFactory(registry);
session = sessionFactory.openSession();
}
和after（）方法：
@After
public void after {
session.close();
sessionFactory.close();
}
当然，在每次测试中删除所有打开/关闭会话。