我正在学习 JPA 并遇到问题，我在我的持久性文件中使用实体生成的东西(太累了，想不出名字)，所以我的实体是最新的。但我在加入他们时遇到了问题。
我的问题是我认为我没有正确加入实体
异常
javax.servlet.ServletException: java.lang.reflect.InvocationTargetException at org.glassfish.webservices.monitoring.WebServiceTesterServlet.doPost(WebServiceTesterServlet.java:326) at org.glassfish.webservices.monitoring.WebServiceTesterServlet.invoke(WebServiceTesterServlet.java:102) at org.glassfish.webservices.EjbWebServiceServlet.service(EjbWebServiceServlet.java:110) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at com.sun.grizzly.http.servlet.FilterChainImpl.doFilter(FilterChainImpl.java:195) at com.sun.grizzly.http.servlet.FilterChainImpl.invokeFilterChain(FilterChainImpl.java:139) at com.sun.grizzly.http.servlet.ServletAdapter.doService(ServletAdapter.java:376) at com.sun.grizzly.http.servlet.ServletAdapter.service(ServletAdapter.java:329) at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:166) at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:100) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:245) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57) at com.sun.grizzly.ContextTask.run(ContextTask.java:69) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309) at java.lang.Thread.run(Thread.java:619) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.glassfish.webservices.monitoring.WebServiceTesterServlet.doPost(WebServiceTesterServlet.java:297) ... 24 more Caused by: com.sun.xml.ws.streaming.XMLStreamReaderException: unexpected XML tag. expected: {http://test.com/}getDepartmentResponse but found: {http://schemas.xmlsoap.org/soap/envelope/}Envelope at com.sun.xml.ws.streaming.XMLStreamReaderUtil.verifyTag(XMLStreamReaderUtil.java:214) at com.sun.xml.ws.streaming.XMLStreamReaderUtil.verifyTag(XMLStreamReaderUtil.java:222) at com.sun.xml.ws.client.sei.ResponseBuilder$DocLit.readResponse(ResponseBuilder.java:546) at com.sun.xml.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:121) at com.sun.xml.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:89) at com.sun.xml.ws.client.sei.SEIStub.invoke(SEIStub.java:140) at $Proxy362.getDepartment(Unknown Source) ... 29 more
org.eclipse.persistence.internal.jpa.EntityManagerImpl.findInternal(EntityManagerImpl.java
:647) at
org.eclipse.persistence.internal.jpa.EntityManagerImpl.find(EntityManagerImpl.java:581) at
org.eclipse.persistence.internal.jpa.EntityManagerImpl.find(EntityManagerImpl.java:460)
com.sun.enterprise.container.common.impl.EntityManagerWrapper.find(EntityManagerWrapper.ja
va:309) at com.test.TestBean.getDepartment(TestBean.java:126)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at
java.lang.reflect.Method.invoke(Method.java:597) at
org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.jav
a:1056) at
org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1
128) at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5292) at
com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:615) at
com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.ja
va:797) at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:567)
com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy
.java:157)
com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorP
roxy.java:139) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597) at
com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.j
ava:858)
com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.ja
va:797) at
com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:3
67) at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5264) at
com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5252)
com.sun.ejb.containers.WebServiceInvocationHandler.invoke(WebServiceInvocationHandler.java
:188) ... 66 more
调用自(em 被注入(inject)到 bean 中)
public Department getDepartment(int id){
Department dep = null;
dep = em.find(Department.class,id);
return dep;
}
部门
package com.test1;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.OrderBy;
@Entity
public class Department {
@Id
private int id;
private String name;
@OneToMany(mappedBy="department")
@OrderBy("name ASC")
private List<Employee> employees;
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;
}
public List<Employee> getEmployees() {
return employees;
}
public void setEmployees(List<Employee> employees) {
this.employees = employees;
}
}
员工
package com.test1;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class Employee {
@Id private int id;
private String name;
private long salary;
private Department department;
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;
}
public long getSalary() {
return salary;
}
public void setSalary(long salary) {
this.salary = salary;
}
public void setDepartment(Department department) {
this.department = department;
}
public Department getDepartment() {
return department;
}
}
坚持
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
<persistence-unit name="testConnection" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>jdbc/testingManagment</jta-data-source>
<non-jta-data-source>jdbc/testingManagment</non-jta-data-source>
<class>com.test1.Employee</class>
<class>com.test1.Department</class>
<properties>
<!-- maintains a most frequently used subcache that uses soft references -->
<property name="eclipselink.cache.type.default" value="SoftWeak"/>
<!-- makes cashe accsessable to other clients attached to the session -->
<property name="eclipselink.cache.shared.default" value="true"/>
<property name="eclipselink.flush-clear.cache" value="Drop"/>
<!-- JDBC definition -->
<property name="eclipselink.jdbc.driver" value="oracle.jdbc.driver.OracleDriver" />
<property name="eclipselink.jdbc.url" value="jdbc:oracle:thin:@localhost:1521:xe" />
<property name="eclipselink.jdbc.user" value="system" />
<property name="eclipselink.jdbc.password" value="nightmare11" />
<property name="eclipselink.jdbc.read-connections.min" value="1" />
<property name="eclipselink.jdbc.write-connections.min" value="1" />
<property name="eclipselink.jdbc.batch-writing" value="JDBC" />
<!-- Logging -->
<property name="eclipselink.logging.level" value="FINE" />
<property name="eclipselink.logging.timestamp" value="false" />
<property name="eclipselink.logging.session" value="false" />
<property name="eclipselink.logging.thread" value="false" />
<!-- Table Creation Stuff -->
<property name="eclipselink.ddl-generation" value="drop-and-create-tables"/>
<property name="eclipselink.ddl-generation.output-mode" value="both"/>
<property name="eclipselink.application-location" value="generatedSQL"/>
<!-- -->
</properties>
</persistence-unit>
</persistence>
如果有人能帮我一把，那就太棒了 再次感谢 乔恩
最佳答案
您的主键(用 @Id 标记)是 int，并且您尝试将 Long 传递给 em.find(..) - 而是传递 int。
关于java - JPA实体加入问题(我认为)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/3696453/