Question

我正在尝试从this URL

实现EJB示例

但客户端的EJBTester.java给出的错误是：

java.io.FileNotFoundException: jndi.properties (No such file or directory)
    at java.io.FileInputStream.open(Native Method)
    at java.io.FileInputStream.<init>(FileInputStream.java:146)
    at java.io.FileInputStream.<init>(FileInputStream.java:101)
    at com.tutorialspoint.test.EJBTester.<init>(EJBTester.java:23)
    at com.tutorialspoint.test.EJBTester.main(EJBTester.java:37)
javax.naming.NoInitialContextException: Cannot instantiate class: org.jnp.interfaces.NamingContextFactory [Root exception is java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory]
    at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:674)
    at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:307)
    at javax.naming.InitialContext.init(InitialContext.java:242)
    at javax.naming.InitialContext.<init>(InitialContext.java:216)
    at com.tutorialspoint.test.EJBTester.<init>(EJBTester.java:28)
    at com.tutorialspoint.test.EJBTester.main(EJBTester.java:37)
Caused by: java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:278)
    at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:72)
    at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:61)
    at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:671)
    ... 5 more
java.lang.NullPointerException
    at com.tutorialspoint.test.EJBTester.testStatelessEjb(EJBTester.java:51)
null
    at com.tutorialspoint.test.EJBTester.main(EJBTester.java:39)

请您提供一个很好的例子，我可以从中清除我的EJB概念吗？

Answer 1

您的代码（来自评论）

import javax.naming.InitialContext;
BufferedReader brConsoleReader = null;
Properties props = new Properties();

InitialContext ctx;
{
    try {
        props.load(new FileInputStream("jndi.properties"));
    } catch (IOException ex) {
        ex.printStackTrace();
    }
    try {
        ctx = new InitialContext(props);
    } catch (NamingException ex) {
        ex.printStackTrace();
    }
    brConsoleReader = new BufferedReader(new InputStreamReader(System.in));

将尝试从工作目录

加载jndi.properties

请执行以下操作：

InitialContext initialContext = new InitialContext();

这会从类路径的根目录中加载jndi.properties作为资源。

如果你真的想要明确加载jndi.properties（来自类路径），请使用以下

ClassLoader loader = Thread.currentThread().getContextClassLoader();
InputStream input = loader.getResourceAsStream("jndi.properties");
if (input == null) {
    throw new IllegalStateException("Could not find jndi.properties in class path");
}
props.load(input);

在EJB示例中获取错误

1 个答案: