我正在创建一个在Wildfly 10上运行的EJB模块，其中包含一个名为SampleBeanRemote的远程接口：
@Remote
public interface SampleBeanRemote {
public int echo(int id);
}
和ist实现名为SampleBeanRemoteImpl，其中包含echo方法将负责连接MySQL数据库，以便在我的远程客户端请求时获取数据：
@Stateless
@Remote(SampleBeanRemote.class)
public class SampleBeanRemoteImpl implements SampleBeanRemote {
private Connection conn;
/**
* Default constructor.
* @throws ClassNotFoundException
*/
public SampleBeanRemoteImpl() throws ClassNotFoundException {
this.conn = setUpConnection();
}
private Connection setUpConnection() throws ClassNotFoundException {
String url = "jdbc:mysql://localhost:3306/testdb";
String userName = "root";
String password = "root";
try {
Class.forName("com.mysql.jdbc.Driver");
System.out.println("Connecting to a selected database...");
conn = DriverManager.getConnection(url, userName, password);
System.out.println("Connected database successfully...");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}
@Override
public int echo(int id) {
// TODO Auto-generated method stub
Statement stmt = null;
String sql = "SELECT data FROM testdb.ejbdata WHERE id="+id;
int data = 0;
try {
stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(sql);
rs.next();
data = rs.getInt("data");
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return data;
}
}
My Client EJB，名为RemoteEJBClient，可以通过调用带有相应id的echo方法来请求数据，然后它将如下所示：
public class RemoteEJBClient {
public static void main(String[] args) throws Exception {
testRemoteEJB();
}
private static void testRemoteEJB() throws NamingException {
final SampleBeanRemote ejb = lookupRemoteEJB2();
int s = ejb.echo(1);
System.out.println(s);
}
private static SampleBeanRemote lookupRemoteEJB2() throws NamingException {
Properties jndiProperties = new Properties();
jndiProperties.put(Context.INITIAL_CONTEXT_FACTORY, "org.jboss.naming.remote.client.InitialContextFactory");
jndiProperties.put(Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming");
jndiProperties.put("jboss.naming.client.ejb.context", true);
jndiProperties.put(Context.PROVIDER_URL, "http-remoting://localhost:8085");
/**Context For JNDI**/
InitialContext context = new InitialContext(jndiProperties);
final String appName = "";
final String moduleName = "ejb-remote-server";
final String distinctName = "";
final String beanName = SampleBeanRemoteImpl.class.getSimpleName();
final String viewClassName = SampleBeanRemote.class.getName();
/**The nameOfEJB appears on the console when it is starting up.**/
String nameOfEJB = appName + "/" + moduleName + "/" + distinctName + "/" + beanName + "!" + viewClassName;
System.out.println("Looking EJB via JNDI ");
System.out.println(nameOfEJB);
/**The Method .lookup("") search for EJB by name**/
return (SampleBeanRemote) context.lookup(nameOfEJB);
}
}
但后来我得到了一些例外，如下所示。我认为这个问题是由我的EJB模块与MySQL数据库之间的连接引起的，而不是因为我的客户端与EJB模块之间的连接。有没有人知道如何解决它？谢谢
Exception in thread "main" javax.ejb.EJBException: java.lang.ClassNotFoundException: javax.enterprise.inject.CreationException
at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:238)
at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:183)
at org.jboss.ejb.client.EJBInvocationHandler.invoke(EJBInvocationHandler.java:146)
at com.sun.proxy.$Proxy2.echo(Unknown Source)
at com.sample.client.RemoteEJBClient.testRemoteEJB(RemoteEJBClient.java:23)
at com.sample.client.RemoteEJBClient.main(RemoteEJBClient.java:16)
Caused by: java.lang.ClassNotFoundException: javax.enterprise.inject.CreationException
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.jboss.marshalling.AbstractClassResolver.loadClass(AbstractClassResolver.java:131)
at org.jboss.marshalling.AbstractClassResolver.resolveClass(AbstractClassResolver.java:112)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadClassDescriptor(RiverUnmarshaller.java:948)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadNewObject(RiverUnmarshaller.java:1255)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:276)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:224)
at org.jboss.marshalling.river.RiverUnmarshaller.readFields(RiverUnmarshaller.java:1745)
at org.jboss.marshalling.river.RiverObjectInputStream.defaultReadObject(RiverObjectInputStream.java:81)
at java.lang.Throwable.readObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.marshalling.reflect.SerializableClass.callReadObject(SerializableClass.java:309)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1637)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1606)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1606)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1606)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadNewObject(RiverUnmarshaller.java:1285)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:276)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:224)
at org.jboss.marshalling.river.RiverUnmarshaller.readFields(RiverUnmarshaller.java:1745)
at org.jboss.marshalling.river.RiverObjectInputStream.defaultReadObject(RiverObjectInputStream.java:81)
at java.lang.Throwable.readObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.marshalling.reflect.SerializableClass.callReadObject(SerializableClass.java:309)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1637)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1606)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1606)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1606)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadNewObject(RiverUnmarshaller.java:1285)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:276)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:224)
at org.jboss.marshalling.river.RiverUnmarshaller.readFields(RiverUnmarshaller.java:1745)
at org.jboss.marshalling.river.RiverObjectInputStream.defaultReadObject(RiverObjectInputStream.java:81)
at java.lang.Throwable.readObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.marshalling.reflect.SerializableClass.callReadObject(SerializableClass.java:309)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1637)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1606)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1606)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1606)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadNewObject(RiverUnmarshaller.java:1285)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:276)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:209)
at org.jboss.marshalling.AbstractObjectInput.readObject(AbstractObjectInput.java:41)
at org.jboss.ejb.client.remoting.InvocationExceptionResponseHandler$MethodInvocationExceptionResultProducer.getResult(InvocationExceptionResponseHandler.java:79)
at org.jboss.ejb.client.EJBClientInvocationContext.getResult(EJBClientInvocationContext.java:276)
at org.jboss.ejb.client.EJBObjectInterceptor.handleInvocationResult(EJBObjectInterceptor.java:64)
at org.jboss.ejb.client.EJBClientInvocationContext.getResult(EJBClientInvocationContext.java:290)
at org.jboss.ejb.client.EJBHomeInterceptor.handleInvocationResult(EJBHomeInterceptor.java:88)
at org.jboss.ejb.client.EJBClientInvocationContext.getResult(EJBClientInvocationContext.java:290)
at org.jboss.ejb.client.TransactionInterceptor.handleInvocationResult(TransactionInterceptor.java:46)
at org.jboss.ejb.client.EJBClientInvocationContext.getResult(EJBClientInvocationContext.java:290)
at org.jboss.ejb.client.ReceiverInterceptor.handleInvocationResult(ReceiverInterceptor.java:142)
at org.jboss.ejb.client.EJBClientInvocationContext.getResult(EJBClientInvocationContext.java:265)
at org.jboss.ejb.client.EJBClientInvocationContext.awaitResponse(EJBClientInvocationContext.java:453)
at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:204)
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