java - InitialContext 在尝试查找时抛出异常

Question

我是 EJB 的新手，我正在尝试从 InitialContext 中查找 EJB，一切正常，直到我更改了项目名称，现在它给了我这个异常:

javax.naming.NoInitialContextException: Need to specify class name in environment or system  property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.lookup(Unknown Source)
at client.TestingEnt.main(TestingEnt.java:23)

这是我的代码:

public class TestingEnt {

public static void main(String[] args){
    InitialContext ctx=getInitialContext();
    EmployeeManager stub=null;
    try {
        stub = (EmployeeManager) ctx.lookup(getLookupName());
    } catch (NamingException e) {
        System.out.println("Lookup Failed");
        e.printStackTrace();
    }

    //Add new employee

    Employee emp1=new Employee();
    emp1.setFirstName("David");
    emp1.setLastName("Young");
    emp1.setDept("Sales");
    emp1.setSalary(10000);
    stub.addEmployee(emp1);
    System.out.println("Employee no'1 was added");

    Employee emp2=new Employee();
    emp2.setFirstName("Dana");
    emp2.setLastName("Kore");
    emp2.setDept("Finance");
    emp2.setSalary(15000);
    stub.addEmployee(emp2); 
    System.out.println("Employee no'2 was added");
    System.out.println("______________________________");


   private static String getLookupName() {

       String appName = "";

       String moduleName = "EntitiesLab";

       String distinctName = "";

       String beanName = EmployeeManagerBean.class.getSimpleName();

       System.out.println(beanName);

       final String interfaceName = EmployeeManager.class.getName();

       System.out.println(interfaceName);

       String name = "ejb:" + appName + "/" + moduleName + "/" +
           distinctName    + "/" + beanName + "!" + interfaceName;
       System.out.println(name);
       return name;
   }

public static InitialContext getInitialContext(){
    Properties properties = new Properties();
    properties.put(Context.URL_PKG_PREFIXES,"org.jboss.ejb.client.naming");
    try {
        return new InitialContext(properties);
    } catch (NamingException e) {
        System.out.println("Cannot generate InitialContext");
        e.printStackTrace();
    }
    return null;
}

}

它之前工作正常，我所做的只是更改项目名称，现在它抛出异常。我确实在查找方法中更改了项目名称，所以一切都应该有效，那么我在这里可能遗漏了什么？

Answer 1

这是您的环境问题，而不是您的代码问题(尽管代码确实包含线索)。

您的代码告诉 jndi 如何通过名为 org.jboss.ejb.client.naming 的环境变量查找初始上下文。该变量包含您的类的全名，以及它的包名。当您重命名项目时，您可能也更改了包名称。现在环境变量 org.jboss.ejb.client.naming 指向一些不存在的类。您需要更改该变量以引用重命名的类名来解决问题。