我希望能够有两个Wildfly(或JBoss 7)实例,其中一个服务器与另一个服务器上的EJB通信。棘手的部分是according to documentation,需要创建带有出站套接字绑定的远程出站连接。这对我们的运营团队来说是一个很大的麻烦,特别是当我们想要扩展时。
Wildfly实例有没有办法通过以编程方式指定远程主机来调用另一个Wildfly实例上的EJB?
我已经能够让Tomcat 7调用Wildfly EJB了。我在org.jboss.as:jboss-as-ejb-client-bom:7.5.0.Final-redhat-21上添加了一个Maven依赖项,并根据this documentation设置了连接设置。
谢谢!
修改
当我尝试使用在Tomcat 7中工作的相同代码(使用jboss-ejb-client库)时,当我的代码尝试EJBCLIENT000021: EJB client context selector may not be changed
时,我收到错误EJBClientContext.setSelector( selector )
。我是以编程方式设置远程连接主机和端口,而不是使用jboss-ejb-client.properties。
答案 0 :(得分:2)
jgitter的回答让我大部分都在那里。这就是我最终的结果:
/**
* @return a reference to the EJB
* @throws EjbLookupException
*/
@NotNull
public T lookup ()
throws EjbLookupException
{
String path = createJndiPath();
Context initialContext = null;
try
{
initialContext = createInitialContext();
//noinspection unchecked
final T ejb = (T)initialContext.lookup( path );
if( m_apiVersion != null )
{
( (RemoteAPI)ejb ).validateClientCompatibility( m_apiVersion );
}
return ejb;
}
catch( NamingException | RuntimeException e )
{
throw new EjbLookupException( "Unable to find the JBoss EJB at " + path, e );
}
finally
{
if( initialContext != null )
{
//noinspection ThrowableResultOfMethodCallIgnored
Closer.close( initialContext );
}
}
}
/**
* There are a lot of ways to do JBoss 7 / Wildfly EJB lookups. Using this method, we don't have to create
* outbound socket bindings whenever we want to use a remote EJB.
*
* @throws NamingException
*/
@NotNull
private Context createInitialContext ()
throws NamingException
{
Properties properties = new Properties();
properties.put( Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming" );
properties.put( "org.jboss.ejb.client.scoped.context", "true" );
properties.put( "remote.connectionprovider.create.options.org.xnio.Options.SSL_ENABLED", "false" );
properties.put( "remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS", "false" );
properties.put( "remote.connections", "default" );
properties.put( "remote.connection.default.host", m_host );
properties.put( "remote.connection.default.port", String.valueOf( m_port ) );
if( m_username != null )
{
properties.put( "remote.connection.default.username", m_username );
}
if( m_password != null )
{
properties.put( "remote.connection.default.password", m_password );
}
return new InitialContext( properties );
}
public static class EjbLookupException
extends Exception
{
EjbLookupException (
@NotNull String message,
@NotNull Throwable cause )
{
super( message, cause );
}
}
我不确定是否需要scoped context,我可能无法正确关闭连接。我将根据我发现的内容更新此答案。
答案 1 :(得分:1)
您不必使用远程出站连接。您可以像编写任何外部客户端一样编写代码。请参阅:https://docs.jboss.org/author/display/WFLY9/EJB+invocations+from+a+remote+client+using+JNDI。