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Jakarta ee 模块尚未部署

jakarta-ee

Jakarta ee 模块尚未部署,jakarta-ee,ejb,Jakarta Ee,Ejb,我正在使用[netbeans+glassfish]开发一个项目，它基于JavaEEWeb应用程序（JSPServlet，EJB，JPA），基于Djerby的Java数据库，在运行时无法部署它。 当我删除注释@PersistenceContext时，部署工作正常 ，但需要放置该注释。 以下是一些例外： In-place deployment at C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\build\web GlassFi

我正在使用[netbeans+glassfish]开发一个项目，它基于JavaEEWeb应用程序（JSPServlet，EJB，JPA），基于Djerby的Java数据库，在运行时无法部署它。 当我删除注释@PersistenceContext时，部署工作正常 ，但需要放置该注释。
以下是一些例外：

In-place deployment at C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\build\web
GlassFish Server (1), deploy, null, false
C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\nbproject\build-impl.xml:1045: The module has not been deployed.
See the server log for details.
BUILD FAILED (total time: 1 second)
Netbeans日志 玻璃鱼原木 StudentDao.java
首先，确保您使用的是作为应用程序服务器的Glassfish，而不是更新并修补了Glassfish版本的Glassfish。Glassfish没有得到维护，有些版本（如4.1）包含无法修复的bug，比如创建资源的版本，这也可能是问题的根源

其次，检查persistence.xml文件，确保您有正确的JTA persistence名称，与Glassfish/Payara服务器上的数据源JNDI名称相同：
yourdsname here

第三，转到Glassfish/Payara管理，检查您是否正确设置了JDBC连接池和JDBC资源并命名为->

在继续并将其放入persistence.xml之前，请在应用程序服务器的管理控制台中测试JDBC资源，但最重要的是，确保切换到Payara而不是Glassfish，以避免将时间浪费在可能未修复的bug上，它们基本上是一样的，除了Payara已进行修补和主动维护之外。

请阅读错误消息。它告诉您，问题是连接到数据库，由于一个无效的用户名（显然是空的）正常情况下，我连接到数据库，我不知道他为什么会显示错误。。。请看这里：我一直在使用jsf项目处理数据库，这就是persistence.xml。glassfish服务器内的数据库池定义中可能存在的问题：RAR5038:为池{POOLEFO:（name=java:app/derby_net_Student_pool）创建资源时出现意外异常如何纠正这个问题？顺便说一句，我以前没有创建任何池，我想我使用的是Glassfish提供的默认池。我不知道。我可以阅读错误消息，但我从未使用Glassfish或Derby。阅读文档？好主意，我会尝试切换到Payara服务器，谢谢你的建议。顺便说一句，我的问题已经解决了已经解决的问题是，在glassfish服务器中使用JDBC连接数据库池定义，执行Entitymanager的注入，并最终与JDBC通信 
 C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\build\web\WEB-INF\classes
    Created dir: C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\build\web\META-INF
    Copying 1 file to C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\build\web\META-INF
    Created dir: C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\build\web\WEB-INF\classes\META-INF
    Copying 1 file to C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\build\web\WEB-INF\classes\META-INF
    Copying 3 files to C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\build\web
    library-inclusion-in-archive:
    library-inclusion-in-manifest:
    Created dir: C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\build\empty
    Created dir: C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\build\generated-sources\ap-source-output
    Compiling 4 source files to C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\build\web\WEB-INF\classes
    Note: C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\src\java\test\StudentDao.java uses unchecked or unsafe operations.
    Note: Recompile with -Xlint:unchecked for details.
    compile:
    compile-jsps:
    Created dir: C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\dist
    Building jar: C:\Users\ahmed\Documents\NetBeansProjects\WebApplication6\dist\WebApplication6.war
    do-dist:
    dist:
    BUILD SUCCESSFUL (total time: 0 seconds)

Avertissement:   RAR5038:Unexpected exception while creating resource for pool { PoolInfo : (name=java:app/derby_net_Student_Pool), (applicationName=WebApplication6) }. Exception : javax.resource.spi.ResourceAllocationException: Connection could not be allocated because: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.
Avertissement:   RAR5117 : Failed to obtain/create connection from connection pool [ { PoolInfo : (name=java:app/derby_net_Student_Pool), (applicationName=WebApplication6) } ]. Reason : com.sun.appserv.connectors.internal.api.PoolingException: Connection could not be allocated because: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.
Avertissement:   RAR5114 : Error allocating connection : [Error in allocating a connection. Cause: Connection could not be allocated because: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.]
Grave:   Local Exception Stack: 
Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.
Error Code: 0
    at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:316)
    at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:147)
    at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.setOrDetectDatasource(DatabaseSessionImpl.java:207)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:750)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:265)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:731)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:303)
    at org.glassfish.persistence.jpa.JPADeployer$2.visitPUD(JPADeployer.java:451)
    at org.glassfish.persistence.jpa.JPADeployer$PersistenceUnitDescriptorIterator.iteratePUDs(JPADeployer.java:510)
    at org.glassfish.persistence.jpa.JPADeployer.iterateInitializedPUsAtApplicationPrepare(JPADeployer.java:492)
    at org.glassfish.persistence.jpa.JPADeployer.event(JPADeployer.java:398)
    at org.glassfish.kernel.event.EventsImpl.send(EventsImpl.java:131)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:487)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:219)
    at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:491)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:539)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:535)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:360)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2.execute(CommandRunnerImpl.java:534)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$3.run(CommandRunnerImpl.java:565)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$3.run(CommandRunnerImpl.java:557)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:360)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:556)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1464)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1300(CommandRunnerImpl.java:109)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1846)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1722)
    at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:534)
    at com.sun.enterprise.v3.admin.AdminAdapter.onMissingResource(AdminAdapter.java:224)
    at org.glassfish.grizzly.http.server.StaticHttpHandlerBase.service(StaticHttpHandlerBase.java:189)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.
    at com.sun.gjc.spi.base.AbstractDataSource.getConnection(AbstractDataSource.java:121)
    at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:135)
    ... 53 more
Caused by: javax.resource.spi.ResourceAllocationException: Error in allocating a connection. Cause: Connection could not be allocated because: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.
    at com.sun.enterprise.connectors.ConnectionManagerImpl.internalGetConnection(ConnectionManagerImpl.java:319)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:196)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:171)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:166)
    at com.sun.gjc.spi.base.AbstractDataSource.getConnection(AbstractDataSource.java:114)
    ... 54 more
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: Connection could not be allocated because: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.
    at com.sun.enterprise.resource.pool.datastructure.RWLockDataStructure.addResource(RWLockDataStructure.java:103)
    at com.sun.enterprise.resource.pool.ConnectionPool.addResource(ConnectionPool.java:282)
    at com.sun.enterprise.resource.pool.ConnectionPool.createResourceAndAddToPool(ConnectionPool.java:1512)
    at com.sun.enterprise.resource.pool.ConnectionPool.createResources(ConnectionPool.java:944)
    at com.sun.enterprise.resource.pool.ConnectionPool.initPool(ConnectionPool.java:230)
    at com.sun.enterprise.resource.pool.ConnectionPool.internalGetResource(ConnectionPool.java:511)
    at com.sun.enterprise.resource.pool.ConnectionPool.getResource(ConnectionPool.java:381)
    at com.sun.enterprise.resource.pool.PoolManagerImpl.getResourceFromPool(PoolManagerImpl.java:245)
    at com.sun.enterprise.resource.pool.PoolManagerImpl.getResource(PoolManagerImpl.java:170)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.getResource(ConnectionManagerImpl.java:360)
    at com.sun.enterprise.connectors.ConnectionManagerImpl.internalGetConnection(ConnectionManagerImpl.java:307)
    ... 58 more
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: Connection could not be allocated because: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.
    at com.sun.enterprise.resource.pool.ConnectionPool.createSingleResource(ConnectionPool.java:924)
    at com.sun.enterprise.resource.pool.ConnectionPool.createResource(ConnectionPool.java:1189)
    at com.sun.enterprise.resource.pool.datastructure.RWLockDataStructure.addResource(RWLockDataStructure.java:98)
    ... 68 more
Caused by: com.sun.appserv.connectors.internal.api.PoolingException: Connection could not be allocated because: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.
    at com.sun.enterprise.resource.allocator.LocalTxConnectorAllocator.createResource(LocalTxConnectorAllocator.java:110)
    at com.sun.enterprise.resource.pool.ConnectionPool.createSingleResource(ConnectionPool.java:907)
    ... 70 more
Caused by: javax.resource.spi.ResourceAllocationException: Connection could not be allocated because: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.
    at com.sun.gjc.spi.DSManagedConnectionFactory.createManagedConnection(DSManagedConnectionFactory.java:129)
    at com.sun.enterprise.resource.allocator.LocalTxConnectorAllocator.createResource(LocalTxConnectorAllocator.java:87)
    ... 71 more
Caused by: java.sql.SQLNonTransientConnectionException: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.
    at org.apache.derby.client.am.SQLExceptionFactory.getSQLException(Unknown Source)
    at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source)
    at org.apache.derby.jdbc.BasicClientDataSource40.getConnection(Unknown Source)
    at com.sun.gjc.spi.DSManagedConnectionFactory.createManagedConnection(DSManagedConnectionFactory.java:117)
    ... 72 more
Caused by: ERROR 08001: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.
    at org.apache.derby.client.net.NetConnection.checkUserLength(Unknown Source)
    at org.apache.derby.client.net.NetConnection.checkUser(Unknown Source)
    at org.apache.derby.client.net.NetConnection.checkUserPassword(Unknown Source)
    at org.apache.derby.client.net.NetConnection.flowConnect(Unknown Source)
    at org.apache.derby.client.net.NetConnection.initialize(Unknown Source)
    at org.apache.derby.client.net.NetConnection.<init>(Unknown Source)
    at org.apache.derby.client.net.ClientJDBCObjectFactoryImpl.newNetConnection(Unknown Source)
    at org.apache.derby.jdbc.BasicClientDataSource40.getConnectionX(Unknown Source)
    ... 74 more

Grave:   Exception while deploying the app [WebApplication6]
Grave:   Exception during lifecycle processing
org.glassfish.deployment.common.DeploymentException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.
Error Code: 0
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:815)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:303)
    at org.glassfish.persistence.jpa.JPADeployer$2.visitPUD(JPADeployer.java:451)
    at org.glassfish.persistence.jpa.JPADeployer$PersistenceUnitDescriptorIterator.iteratePUDs(JPADeployer.java:510)
    at org.glassfish.persistence.jpa.JPADeployer.iterateInitializedPUsAtApplicationPrepare(JPADeployer.java:492)
    at org.glassfish.persistence.jpa.JPADeployer.event(JPADeployer.java:398)
    at org.glassfish.kernel.event.EventsImpl.send(EventsImpl.java:131)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:487)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:219)
    at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:491)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:539)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:535)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:360)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2.execute(CommandRunnerImpl.java:534)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$3.run(CommandRunnerImpl.java:565)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$3.run(CommandRunnerImpl.java:557)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:360)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:556)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1464)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1300(CommandRunnerImpl.java:109)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1846)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1722)
    at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:534)
    at com.sun.enterprise.v3.admin.AdminAdapter.onMissingResource(AdminAdapter.java:224)
    at org.glassfish.grizzly.http.server.StaticHttpHandlerBase.service(StaticHttpHandlerBase.java:189)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
    at java.lang.Thread.run(Thread.java:745)

Grave:   Exception while deploying the app [WebApplication6] : Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: La longueur de l'ID utilisateur (0) se situe hors de la plage comprise entre 1 et 255.
Error Code: 0
Avertissement

package test;

import java.io.Serializable;
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.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import javax.xml.bind.annotation.XmlRootElement;

/**
 *
 * @author ahmed
 */
@Entity
@Table(name = "STUDENT")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Student.findAll", query = "SELECT s FROM Student s")
    , @NamedQuery(name = "Student.findByStudentid", query = "SELECT s FROM Student s WHERE s.studentid = :studentid")
    , @NamedQuery(name = "Student.findByName", query = "SELECT s FROM Student s WHERE s.name = :name")
    , @NamedQuery(name = "Student.findBySecondname", query = "SELECT s FROM Student s WHERE s.secondname = :secondname")
    , @NamedQuery(name = "Student.findByYearlevel", query = "SELECT s FROM Student s WHERE s.yearlevel = :yearlevel")})
public class Student implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @NotNull
    @Column(name = "STUDENTID")
    private Integer studentid;
    @Size(max = 255)
    @Column(name = "NAME")
    private String name;
    @Size(max = 255)
    @Column(name = "SECONDNAME")
    private String secondname;
    @Column(name = "YEARLEVEL")
    private Integer yearlevel;

    public Student() {
    }

    public Student(Integer studentid, String name, String secondname, Integer yearlevel) {
        this.studentid = studentid;
        this.name = name;
        this.secondname = secondname;
        this.yearlevel = yearlevel;
    }


    public Student(Integer studentid) {
        this.studentid = studentid;
    }

    public Integer getStudentid() {
        return studentid;
    }

    public void setStudentid(Integer studentid) {
        this.studentid = studentid;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSecondname() {
        return secondname;
    }

    public void setSecondname(String secondname) {
        this.secondname = secondname;
    }

    public Integer getYearlevel() {
        return yearlevel;
    }

    public void setYearlevel(Integer yearlevel) {
        this.yearlevel = yearlevel;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (studentid != null ? studentid.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 Student)) {
            return false;
        }
        Student other = (Student) object;
        if ((this.studentid == null && other.studentid != null) || (this.studentid != null && !this.studentid.equals(other.studentid))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "test.Student[ studentid=" + studentid + " ]";
    }

}

package test;
import javax.persistence.*;
import java.util.List;
import javax.ejb.Stateless;

import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;

/**
 *
 * @author ahmed
 */
@Stateless
public class StudentDao implements StudentDaoLocal {
    @PersistenceContext
    private EntityManager em ;

    public StudentDao(EntityManager em) {
        this.em = em;
    }
    @Override
    public void addStudent(Student student) {

        em.persist(student);
    }

    // Add business logic below. (Right-click in editor and choose
    // "Insert Code > Add Business Method")

    @Override
    public void editStudent(Student student) {
      em.merge(student);
    }

    @Override
    public void removeStudent(int studentId) {
          Student NewStudent=em.find(Student.class, studentId);
          em.remove(NewStudent);
    }

    @Override
    public Student getStudent(int studentId) {
          Student NewStudent=em.find(Student.class, studentId);
        return NewStudent;
    }

    @Override
    public List<Student> getAll() {
         return em.createNamedQuery("Student.findAll").getResultList();
    }
}

package test;

import java.util.List;
import javax.ejb.Local;

/**
 *
 * @author ahmed
 */
@Local
public interface StudentDaoLocal {
    void addStudent(Student student);

    void editStudent(Student student);

    void removeStudent(int studentId);

    Student getStudent(int studentId);

    List<Student> getAll();
}

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package test;

import java.io.IOException;
import java.io.PrintWriter;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author ahmed
 */

@WebServlet(name = "NewServlet", urlPatterns = {"/NewServlet"})
public class NewServlet extends HttpServlet {
    @EJB
    private StudentDaoLocal studentDao;

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        String action = request.getParameter("action");
        String studentStr = request.getParameter("studentId");
        String firstname =  request.getParameter("firstname");
        String lastname = request.getParameter("lastname");
        String yearlevel = request.getParameter("yearlevel");

        if(action!=null && studentStr !=null && firstname!=null && lastname!=null && yearlevel!=null ){

      int id=Integer.parseInt(studentStr);
         int year = Integer.parseInt(yearlevel);
        request.setAttribute("year", year);
        request.setAttribute("id", id);
        request.setAttribute("n", firstname);
        request.setAttribute("s", lastname);
          Student s = new Student();

       studentDao.addStudent(s);
        //Student s=new Student(id,firstname,lastname,year);

         }
        request.getRequestDispatcher("student.jsp").forward(request, response);
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}