java - Java SE 中的 UserTransaction 问题-6ren

java - Java SE 中的 UserTransaction 问题

转载作者：太空宇宙更新时间：2023-11-04 15:06:50

为了在没有 Java EE 容器的情况下尝试 Java SE 中的声明式事务管理，我只是将 Glassfish 附带的事务 Servlet 示例转换为 Java SE。请参阅原始 Servlet 和随附的修改后的 Java SE 代码。

我正在使用:

JDK 7
weld-se-2.2.0.Alpha2.jar
glassfish4\glassfish\modules\javax.transaction-api.jar
glassfish4\glassfish\modules\javax.inject.jar
glassfish4\glassfish\modules\javax.interceptor-api.jar
glassfish4\glassfish\modules\weld-osgi-bundle.jar
META-INF 文件夹中存在空白 beans.xml 文件。
我使用带有命令“org.jboss.weld.environment.se.StartMain”的批处理文件从命令行运行该程序。

问题:

当我使用 @Inject 注入(inject) UserTransaction 时，出现以下错误:
线程“main”中的异常org.jboss.weld.exceptions.DeploymentException:WELD-001408:带有限定符 @Default 的 UserTransaction 类型的依赖关系不满足在注入(inject)点 [BackedAnnotatedField] @Inject TestSE.userTransaction在 TestSE.userTransaction(TestSE.java:0)
因此，我用 @Resource 替换了 @Inject。
当使用@Resource时，程序运行正常，但没有显示正确的事务行为。即使 Bean 类型是强制的，Bean 也会被注入(inject)并正常工作，并且后续的 userTransaction.begin() 会抛出空指针异常。所有 6 个交易属性似乎都有一个奇怪的行为。

方式肯定有问题，我正在尝试执行它。有人可以帮我纠正这个问题吗？

非常感谢您的帮助。

BeanBase.java

public class BeanBase {
  public String getId() {
    return "ObjectId for this bean is " + this + "";
  }
  public String getId(String s) {
    return "ObjectId for this bean is " + this + " and "+ s;
  }
}

BeanMandatory.java

import javax.transaction.Transactional;

@Transactional(value = Transactional.TxType.MANDATORY)
public class BeanMandatory extends BeanBase {

}

BeanSupports.java

import javax.transaction.Transactional;

@Transactional(value = Transactional.TxType.SUPPORTS)
public class BeanSupports extends BeanBase {
}

BeanRequiresNew.java

import javax.transaction.Transactional;

@Transactional(value = Transactional.TxType.REQUIRES_NEW)
public class BeanRequiresNew extends BeanBase {
}

BeanRequired.java

import javax.transaction.Transactional;

@Transactional(value = Transactional.TxType.REQUIRED)
public class BeanRequired extends BeanBase {
}

BeanNotSupported.java

import javax.transaction.Transactional;

@Transactional(value = Transactional.TxType.NOT_SUPPORTED)
public class BeanNotSupported extends BeanBase {
}

BeanNever.java

import javax.transaction.Transactional;

@Transactional(value = Transactional.TxType.NEVER)
public class BeanNever extends BeanBase {
}

原始事务Servlet代码:

package transactional;

import javax.interceptor.InvocationContext;
import javax.inject.Inject;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.WebServlet;
import javax.transaction.*;
import java.io.IOException;


@WebServlet(name="TransactionalServlet", urlPatterns={"/TransactionalServlet"})
public class TransactionalServlet extends HttpServlet {

    public static ServletOutputStream m_out;

    @Inject
    UserTransaction userTransaction;

    @Injecthytggt
    BeanMandatory beanMandatory;

    @Inject
    BeanNever beanNever;

    @Inject
    BeanNotSupported beanNotSupported;

    @Inject
    BeanRequired beanRequired;

    @Inject
    BeanRequiresNew beanRequiresNew;

    @Inject
    BeanSupports beanSupports;


    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        String transactionalInterceptor = request.getParameter("TransactionalInterceptor");

        m_out = response.getOutputStream();
        m_out.println("<HTML>");
        m_out.println("<HEAD>");
        m_out.println("<title>CDI Sample Application for TransactionScoped Annotation</title>");
        m_out.println("</HEAD>");
        m_out.println("<BODY>");
        m_out.println("TransactionalInterceptor value is -> " + transactionalInterceptor);
        m_out.println("<BR><BR>");

        if (transactionalInterceptor.equalsIgnoreCase("MANDATORY")) {
            try {
                m_out.println("<b>Scenario: Invoking outside transaction. Should get an error.</b>");
                m_out.println("<BR><BR>");
                m_out.println(beanMandatory.getId());
                m_out.println("If you see this, it means there is something wrong!");
                m_out.println("<BR><BR>");
            } catch (Exception transactionalException) {
                if (transactionalException.getCause() instanceof TransactionRequiredException) {
                    m_out.println("Got TransactionRequiredException for transactionalException.getCause() as expected.");
                    m_out.println("<BR><BR>");
                } else {
                    m_out.println("If you see this, it means there is something wrong!");
                    m_out.println(transactionalException.getMessage());
                    m_out.println("<BR><BR>");
                }
            }
            try {
                userTransaction.begin();
                m_out.println("<b>Scenario: Invoking within a transaction.</b>");
                m_out.println("<BR><BR>");
                m_out.println(beanMandatory.getId());
                m_out.println("<BR><BR>");
                userTransaction.commit();               
            } catch (Exception e){
                m_out.println("If you see this, it means there is something wrong!");
                m_out.println(e.getMessage());
                m_out.println("<BR><BR>");
            }
        } else if (transactionalInterceptor.equalsIgnoreCase("NEVER")) {
            try {
                m_out.println("<b>Scenario: Invoking outside transaction.</b>"); 
                m_out.println("<BR><BR>");
                m_out.println(beanNever.getId());
                m_out.println("<BR><BR>");
            } catch (Exception e){
                m_out.println("If you see this, it means there is something wrong!");
                m_out.println(e.getMessage());
                m_out.println("<BR><BR>");
            }
            try {
                userTransaction.begin();
                m_out.println("<b>Scenario: Invoking within a transaction. Should get an error.</b>");
                m_out.println("<BR><BR>");
                m_out.println(beanNever.getId());
                m_out.println("If you see this, it means there is something wrong!");
                m_out.println("<BR><BR>");
            } catch (Exception transactionalException) {                    
                if (transactionalException.getCause() instanceof InvalidTransactionException) {
                    m_out.println("Got InvalidTransactionException for transactionalException.getCause() as expected.");
                    m_out.println("<BR><BR>");
                } else {
                    m_out.println("If you see this, it means there is something wrong!");
                    m_out.println(transactionalException.getMessage());
                    m_out.println("<BR><BR>");
                }
            } finally {
                try {
                    userTransaction.rollback();
                } catch (Exception e) {
                    m_out.println("Got unexpected exception in finally rollback for NEVER" + e.getMessage());
                }
            }
        } else if (transactionalInterceptor.equalsIgnoreCase("NOT_SUPPORTED")) {
            try {
                m_out.println("<b>Scenario: Invoking outside transaction.</b>"); 
                m_out.println("<BR><BR>");
                m_out.println(beanNotSupported.getId());
                m_out.println("<BR><BR>");
            } catch (Exception e){
                m_out.println("If you see this, it means there is something wrong!");
                m_out.println(e.getMessage());
                m_out.println("<BR><BR>");
            } 
            try {
                userTransaction.begin();
                m_out.println("<b>Scenario: Invoking within a transaction. Transaction is suspended during the method call. </b>");
                m_out.println("<BR><BR>");
                m_out.println(beanNotSupported.getId());
                userTransaction.commit();
                m_out.println("<BR><BR>");
            } catch (Exception e){
                m_out.println("If you see this, it means there is something wrong!");
                m_out.println(e.getMessage());
                m_out.println("<BR><BR>");
            }
        } else if (transactionalInterceptor.equalsIgnoreCase("REQUIRED")) {
            try {
                m_out.println("<b>Scenario: Invoking outside transaction. Transaction would be started automatically for the method call.</b>"); 
                m_out.println("<BR><BR>");
                m_out.println(beanRequired.getId());
                m_out.println("<BR><BR>");
            } catch (Exception e){
                m_out.println("If you see this, it means there is something wrong!");
                m_out.println(e.getMessage());
                m_out.println("<BR><BR>");
            } 
            try {
                userTransaction.begin();
                m_out.println("<b>Scenario: Invoking within a transaction.</b>");
                m_out.println("<BR><BR>");
                m_out.println(beanRequired.getId());
                m_out.println("<BR><BR>");
                userTransaction.commit();
            } catch (Exception e){
                m_out.println("If you see this, it means there is something wrong!");
                m_out.println(e.getMessage());
                m_out.println("<BR><BR>");
            }
        } else  if (transactionalInterceptor.equalsIgnoreCase("REQUIRES_NEW")) {
            try {
                m_out.println("<b>Scenario: Invoking outside transaction. Transaction would be started automatically for the method call.</b>");
                m_out.println("<BR><BR>");
                m_out.println(beanRequiresNew.getId());
                m_out.println("<BR><BR>");
            } catch (Exception e){
                m_out.println("If you see this, it means there is something wrong!");
                m_out.println(e.getMessage());
                m_out.println("<BR><BR>");
            } 
            try {
                userTransaction.begin();
                m_out.println("<b>Scenario: Invoking within a transaction. NEW Transaction would be started automatically for the method call. </b>");
                m_out.println("<BR><BR>");
                m_out.println(beanRequiresNew.getId());
                m_out.println("<BR><BR>");
                userTransaction.commit();
            } catch (Exception e){
                m_out.println("If you see this, it means there is something wrong!");
                m_out.println(e.getMessage());
                m_out.println("<BR><BR>");
            }
        } else  if (transactionalInterceptor.equalsIgnoreCase("SUPPORTS")) {
            try {
                m_out.println("<b>Scenario: Invoking outside transaction. Method is executed outside transaction. </b>");
                m_out.println("<BR><BR>");
                m_out.println(beanSupports.getId());
                m_out.println("<BR><BR>");
            } catch (Exception e){
                m_out.println("If you see this, it means there is something wrong!");
                m_out.println(e.getMessage());
                m_out.println("<BR><BR>");
            } 
            try {
                userTransaction.begin();
                m_out.println("<b>Scenario: Invoking within a transaction. Method is executed within transaction context.</b>");
                m_out.println("<BR><BR>");
                m_out.println(beanSupports.getId());
                m_out.println("<BR><BR>");
                userTransaction.commit();
            } catch (Exception e){
                m_out.println("If you see this, it means there is something wrong!");
                m_out.println(e.getMessage());
                m_out.println("<BR><BR>");
            }
        } 

        m_out.println("</BODY>");
        m_out.println("</HTML>");
    }

    /** 
     * 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);
    }


}

我的 Java SE 示例 TestSE.java:

import java.io.BufferedReader;
import java.io.InputStreamReader;

import javax.annotation.Resource;
import javax.inject.Inject;
import javax.transaction.UserTransaction;
import javax.transaction.*;
import javax.enterprise.event.Observes;

import org.jboss.weld.environment.se.events.ContainerInitialized;

public class TestSE {
    //@Inject //since this was throwing an exception, I used @Resource 
    @Resource
    UserTransaction userTransaction;

    @Inject
    BeanMandatory beanMandatory;

    @Inject
    BeanNever beanNever;

    @Inject
    BeanNotSupported beanNotSupported;

    @Inject
    BeanRequired beanRequired;

    @Inject
    BeanRequiresNew beanRequiresNew;

    @Inject
    BeanSupports beanSupports;

    public void process(@Observes ContainerInitialized init)
    {
        // TODO Auto-generated method stub
        String command = null;
        BufferedReader br = null;
        boolean loop = true;

        try
        {
            while(loop)
            {
                System.out.println("> 1 - Mandatory, 2 - Never, 3 - Not Supported, 4 - Required, 5 - Requires New, 6 - Supports, q - Quit");
                System.out.println("Enter your choice and hit enter:");
                br = new BufferedReader(new InputStreamReader(System.in));
                command = br.readLine();
                System.out.println("Received command[" + command + "]");

                switch(command)
                {
                    case "1":
                        System.out.println("Processing Mandatory");

                        try 
                        {
                            System.out.println("Scenario: Invoking outside transaction. Should get an error.");
                            System.out.println(beanMandatory.getId());
                            System.out.println("If you see this, it means there is something wrong!");
                        }
                        catch (Exception transactionalException) 
                        {
                            if (transactionalException.getCause() instanceof TransactionRequiredException) 
                            {
                                System.out.println("Got TransactionRequiredException for transactionalException.getCause() as expected.");
                            }
                            else 
                            {
                                System.out.println("2 If you see this, it means there is something wrong!");
                                System.out.println(transactionalException.getMessage());
                            }
                        }

                        try 
                        {
                            userTransaction.begin();
                            System.out.println("Scenario: Invoking within a transaction.");
                            System.out.println(beanMandatory.getId());
                            userTransaction.commit();               
                        }
                        catch (Exception e)
                        {
                            System.out.println("If you see this, it means there is something wrong!");
                            System.out.println(e.getMessage());
                        }

                        break;
                    case "2":
                        System.out.println("Processing Never");

                        try 
                        {
                            System.out.println("Scenario: Invoking outside transaction."); 
                            System.out.println(beanNever.getId());
                        }
                        catch (Exception e)
                        {
                            System.out.println("If you see this, it means there is something wrong!");
                            System.out.println(e.getMessage());
                        }

                        try 
                        {
                            userTransaction.begin();
                            System.out.println("Scenario: Invoking within a transaction. Should get an error.");
                            System.out.println(beanNever.getId());
                            System.out.println("If you see this, it means there is something wrong!");
                        }
                        catch (Exception transactionalException) 
                        {                   
                            if (transactionalException.getCause() instanceof InvalidTransactionException) 
                            {
                                System.out.println("Got InvalidTransactionException for transactionalException.getCause() as expected.");
                            }
                            else 
                            {
                                System.out.println("If you see this, it means there is something wrong!");
                                System.out.println(transactionalException.getMessage());
                            }
                        }
                        finally 
                        {
                            try 
                            {
                                userTransaction.rollback();
                            }
                            catch (Exception e) 
                            {
                                System.out.println("Got unexpected exception in finally rollback for NEVER" + e.getMessage());
                            }
                        }   

                        break;
                    case "3":
                        System.out.println("Processing NotSupported");

                        try 
                        {
                            System.out.println("Scenario: Invoking outside transaction."); 
                            System.out.println(beanNotSupported.getId());
                        }
                        catch (Exception e)
                        {
                            System.out.println("If you see this, it means there is something wrong!");
                            System.out.println(e.getMessage());
                        }

                        try 
                        {
                            userTransaction.begin();
                            System.out.println("Scenario: Invoking within a transaction. Transaction is suspended during the method call. ");
                            System.out.println(beanNotSupported.getId());
                            userTransaction.commit();
                        }
                        catch (Exception e)
                        {
                            System.out.println("If you see this, it means there is something wrong!");
                            System.out.println(e.getMessage());
                        }

                        break;
                    case "4":
                        System.out.println("Processing Required");

                        try 
                        {
                            System.out.println("Scenario: Invoking outside transaction. Transaction would be started automatically for the method call."); 
                            System.out.println(beanRequired.getId());
                        }
                        catch (Exception e)
                        {
                            System.out.println("If you see this, it means there is something wrong!");
                            System.out.println(e.getMessage());
                        }

                        try 
                        {
                            userTransaction.begin();
                            System.out.println("Scenario: Invoking within a transaction.");
                            System.out.println(beanRequired.getId());
                            userTransaction.commit();
                        }
                        catch (Exception e)
                        {
                            System.out.println("If you see this, it means there is something wrong!");
                            System.out.println(e.getMessage());
                        }

                        break;
                    case "5":
                        System.out.println("Processing RequiresNew");

                        try
                        {
                            System.out.println("Scenario: Invoking outside transaction. Transaction would be started automatically for the method call.");
                            System.out.println(beanRequiresNew.getId());
                        }
                        catch (Exception e)
                        {
                            System.out.println("If you see this, it means there is something wrong!");
                            System.out.println(e.getMessage());
                        }

                        try 
                        {
                            userTransaction.begin();
                            System.out.println("Scenario: Invoking within a transaction. NEW Transaction would be started automatically for the method call. ");
                            System.out.println(beanRequiresNew.getId());
                            userTransaction.commit();
                        }
                        catch (Exception e)
                        {
                            System.out.println("If you see this, it means there is something wrong!");
                            System.out.println(e.getMessage());
                        }

                        break;
                    case "6":
                        System.out.println("Processing Supports");

                        try 
                        {
                            System.out.println("Scenario: Invoking outside transaction. Method is executed outside transaction. ");
                            System.out.println(beanSupports.getId());
                        }
                        catch (Exception e)
                        {
                            System.out.println("If you see this, it means there is something wrong!");
                            System.out.println(e.getMessage());
                        }

                        try 
                        {
                            userTransaction.begin();
                            System.out.println("Scenario: Invoking within a transaction. Method is executed within transaction context.");
                            System.out.println(beanSupports.getId());
                            userTransaction.commit();
                        } 
                        catch (Exception e)
                        {
                            System.out.println("If you see this, it means there is something wrong!");
                            System.out.println(e.getMessage());
                        }                       
                        break;
                    case "q":
                        System.out.println("Quitting...");
                        loop = false;
                }// eof switch
            }// eof for
        }
        catch(Exception excp)
        {
            System.out.println("An exception has occured.");
            excp.printStackTrace();
        }
    }// eof process

}//eof class

最佳答案

请查看此链接 https://github.com/luiz158/usertransaction-in-java-se

我阅读了您的问题并进行了此测试。

再见

关于java - Java SE 中的 UserTransaction 问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21874885/

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java - Java SE 中的 UserTransaction 问题