在JSF和Tomcat中使用RMI

Question

import java.rmi.Remote;

public interface Foo extends Remote {
   public String exec(String test) throws Exception;
}

import java.rmi.server.UnicastRemoteObject;

public class FooImpl extends UnicastRemoteObject implements Foo {

    public FooImpl() throws Exception {
        java.rmi.registry.LocateRegistry.createRegistry(1099);
        java.rmi.Naming.rebind("myFoo",this);
    }

    public String exec(String test) {
        return "This is a Test";
    }

    public static void main(String[] args) {
        try {
            FooImpl fooImpl = new FooImpl();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import java.net.MalformedURLException;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;

@ManagedBean
@RequestScoped
public class IndexBean {

    public void execute() {
        try {
            Foo foo = (Foo) java.rmi.Naming.lookup("//localhost/myFoo");
            System.out.println(foo.exec());
        } catch (NotBoundException e) {
            e.printStackTrace();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }

}

unmarshalException：解组返回错误；嵌套异常为:java.lang.ClassNotFoundException:Foo（无安全管理器：禁用RMI类加载器），地址为sun.RMI.registry.registryimpl_stub.lookup（未知源），地址为java.RMI.naming.lookup(naming.java:101)，地址为bean.indexbean.execute(indexbean.java:15)，地址为sun.reflect.nativeMethodAccessorImpl.invoke(Native Method)，地址为Method.java:606)在org.apache.el.parser.astvalue.invoke(astvalue.java:245)在org.apache.el.methodExpressionImpl.invoke（methodExpressionImpl.java:277)在org.apache.myfaces.view.facelets.el.contextawareTagMethodExpression.invoke（contextawareTagMethodExpression.invoke（位于javax.faces.component.component.uicommand.broadcast(uicommand.java:409)的omponentbase.broadcast(uicommand.java:103)的javax.faces.component.uiviewroot._broadcastall(uiviewroot.java:1013)的javax.faces.component.component.uiviewroot.broadcastEvents(uiviewroot.java:284)的javax.faces.component.uiviewroot._processing在org.apache.myfaces.lifecycle.lifecycleimpl.executePhase(Lifecycleimpl.java:170)在org.apache.myfaces.lifecycleimpl.execute(Lifecycleimpl.java:117)在javax.faces.webapp.facesservlet.service（facesservlet.java:197)在org.apache.catalina.core.applicationFilterChain.InternaldoFilter（applicationFilterChain.java:291)在cat.websocket.server.wsfilter.doFilter(wsfilter.java:52)atinternaldoFilter（applicationFilterChain.java:239)在org.apache.catalina.core.applicationFilterChain.doFilter（applicationFilterChain.java:206)在org.apache.catalina.core.standardWrapperValve.invoke（standardWrapperValve.invoke（standardWrapperValve.java:219)在org.apache.catalina.core.standardContextValve.invoke（standardContextValve.invoke在org.apache.catalina.valves.errorReportValve.invoke(errorReportValve.java:79)在org.apache.catalina.valves.abstractAccessLogValve.invoke(abstractAccessLogValve.java:610)在org.apache.catalina.core.standardEnginEvalve.invoke(StandardEnginEvalve.java:88)在ache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)在org.apache.coyote.http11.http11NioProtocol$http11ConnectionHandler.process(http11NioProtocol.java:222)在org.apache.tomcat.util.net.nioEndpoint$socketProcessor.dorun(NioEndpoint.java:1566)在org.apache.tomcat.util.net.nioEndpoint$socketProcessor.run$worker.run(threadpoolexecutor.java:615)在org.apache.tomcat.util.threads.taskthread$wrappingrunnable.run(taskthread.java:61)在java.lang.thread.run(thread.java:744)由：java.lang.thread.run(thread.java:744)引起：java.lang.thread.run(taskthread.java:61)在sun.RMI.server.loaderhandler.loader.loader:553)在XyClass(rmiclAssLoader.java:311)位于sun.RMI.server.MarshalInputStream.resolv在java.io.objectinputstream.readProxyDesc（objectinputstream.java:1558)在java.io.objectinputstream.readClassDesc（objectinputstream.java:1514)在java.io.objectinputstream.readOrdinaryObject(objectinputstream.java:1771)在java.io.objectinputstream.readObjectinputstream.readObject0(objectinputstream.java：

另外，我更改了Tomcat使用的端口，以避免与RMI端口发生冲突。

Answer 1

客户机的类路径上没有远程接口，也可能没有存根。若要避免使用存根，请添加

super(0);

作为构造函数的第一行。

NB必须将createRegistry()的结果存储在静态变量中，以防止注册表退出。