目前正在尝试完成 SAMS 的第 4 章 - 在 14 天内自学 CORBA。 我使用 idlj 作为 IDL-To-JAVA 编译器，我得到了一个与使用 idl2Java“JDK 预版”不同的类列表，我尝试进行一些编辑，但出现了很多错误。
这是我输入和修改的代码，而不是使用 idlj“编译”(生成):
// StockMarket.idl
// The StockMarket module consists of definitions useful
// for building stock market-related applications.
module StockMarket {
// The StockSymbol type is used for symbols (names)
// representing stocks.
typedef string StockSymbol;
// A StockSymbolList is simply a sequence of
// StockSymbols.
typedef sequence<StockSymbol> StockSymbolList;
// The StockServer interface is the interface for a
// server which provides stock market information.
// (See the comments on the individual methods for
// more information.)
interface StockServer {
// getStockValue() returns the current value for
// the given StockSymbol. If the given StockSymbol
// is unknown, the results are undefined (this
// would be a good place to raise an exception).
float getStockValue(in StockSymbol symbol);
// getStockSymbols() returns a sequence of all
// StockSymbols known by this StockServer.
StockSymbolList getStockSymbols();
};
};
服务器实现
// StockServerImpl.java
package StockMarket;
import java.util.Vector;
import org.omg.CORBA.Context;
import org.omg.CORBA.ContextList;
import org.omg.CORBA.DomainManager;
import org.omg.CORBA.ExceptionList;
import org.omg.CORBA.NVList;
import org.omg.CORBA.NamedValue;
import org.omg.CORBA.ORB;
import org.omg.CORBA.Object;
import org.omg.CORBA.Policy;
import org.omg.CORBA.Request;
import org.omg.CORBA.SetOverrideType;
import org.omg.CosNaming.NameComponent;
import org.omg.CosNaming.NamingContext;
import org.omg.CosNaming.NamingContextHelper;
// StockServerImpl implements the StockServer IDL interface.
public class StockServerImpl extends StockServerPOA
{
// Stock symbols and their respective values.
private Vector myStockSymbols;
private Vector myStockValues;
// Characters from which StockSymbol names are built.
private static char ourCharacters[] = { 'A', 'B', 'C', 'D', 'E', 'F','G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R','S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
// Path name for StockServer objects.
private static String ourPathName = "StockServer";
// Create a new StockServerImpl.
public StockServerImpl() {
myStockSymbols = new Vector();
myStockValues = new Vector();
// Initialize the symbols and values with some random values.
for (int i = 0; i < 10; i++) {
// Generate a string of four random characters.
StringBuffer stockSymbol = new StringBuffer(" ");
for (int j = 0; j < 4; j++) {
stockSymbol.setCharAt(j, ourCharacters[(int)(Math.random()
* 26f)]);
}
myStockSymbols.addElement(stockSymbol.toString());
// Give the stock a value between 0 and 100. In this example,
// the stock will retain this value for the duration of the
// application.
myStockValues.addElement(new Float(Math.random() * 100f));
}
// Print out the stock symbols generated above.
System.out.println("Generated stock symbols:");
for (int i = 0; i < 10; i++) {
System.out.println(" " + myStockSymbols.elementAt(i) + " " +
myStockValues.elementAt(i));
}
System.out.println();
}
// Return the current value for the given StockSymbol.
public float getStockValue(String symbol) {
// Try to find the given symbol.
int stockIndex = myStockSymbols.indexOf(symbol);
if (stockIndex != -1) {
// Symbol found; return its value.
return ((Float)myStockValues.elementAt(stockIndex)).
floatValue();
} else {
// Symbol was not found.
return 0f;
}
}
// Return a sequence of all StockSymbols known by this StockServer.
public String[] getStockSymbols() {
String[] symbols = new String[myStockSymbols.size()];
myStockSymbols.copyInto(symbols);
return symbols;
}
// Create and initialize a StockServer object.
public static void main(String args[]) {
try {
// Initialize the ORB.
ORB orb = ORB.init(args, null);
// Create a StockServerImpl object and register it with the
// ORB.
StockServerImpl stockServer = new StockServerImpl();
orb.connect((Object)stockServer);
// Get the root naming context.
// Get the root naming context.
org.omg.CORBA.Object obj = orb.resolve_initial_references("NameService");
NamingContext namingContext = NamingContextHelper.narrow(obj);
// Bind the StockServer object reference in the naming
// context.
NameComponent nameComponent = new NameComponent(ourPathName,
"");
NameComponent path[] = { nameComponent };
namingContext.rebind(path, (Object)stockServer);
// Wait for invocations from clients.
java.lang.Object waitOnMe = new java.lang.Object();
synchronized (waitOnMe) {
waitOnMe.wait();
}
} catch (Exception ex) {
System.err.println("Couldn't bind StockServer: " + ex.
getMessage());
}
}
@Override
public boolean _is_a(String repositoryIdentifier) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public boolean _non_existent() {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public Object _get_interface_def() {
throw new UnsupportedOperationException("Not supported yet.");
}
}
-- 客户端实现
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package StockMarket;
/**
*
* @author ygalila
*/
import org.omg.CORBA.ORB;
import org.omg.CosNaming.NameComponent;
import org.omg.CosNaming.NamingContext;
import org.omg.CosNaming.NamingContextHelper;
// StockMarketClient is a simple client of a StockServer.
public class StockMarketClient {
// Create a new StockMarketClient.
StockMarketClient() {
}
// Run the StockMarketClient.
public void run() {
connect();
if (myStockServer != null) {
doSomething();
}
}
// Connect to the StockServer.
protected void connect() {
try {
// Get the root naming context.
org.omg.CORBA.Object obj = ourORB.
resolve_initial_references("NameService");
NamingContext namingContext = NamingContextHelper.narrow(obj);
// Attempt to locate a StockServer object in the naming
// context.
NameComponent nameComponent = new NameComponent("StockServer","");
NameComponent path[] = { nameComponent };
myStockServer = StockServerHelper.narrow(namingContext.
resolve(path));
} catch (Exception ex) {
System.err.println("Couldn't resolve StockServer: " + ex);
myStockServer = null;
return;
}
System.out.println("Succesfully bound to a StockServer.");
}
// Do some cool things with the StockServer.
protected void doSomething() {
try {
// Get the valid stock symbols from the StockServer.
String[] stockSymbols = myStockServer.getStockSymbols();
// Display the stock symbols and their values.
for (int i = 0; i < stockSymbols.length; i++) {
System.out.println(stockSymbols[i] + " " +
myStockServer.getStockValue(stockSymbols[i]));
}
} catch (org.omg.CORBA.SystemException ex) {
System.err.println("Fatal error: " + ex);
}
}
// Start up a StockMarketClient.
public static void main(String args[]) {
// Initialize the ORB.
ourORB = ORB.init(args, null);
StockMarketClient stockClient = new StockMarketClient();
stockClient.run();
// This simply waits forever so that the DOS window doesn't
// disappear (for developers using Windows IDEs).
while (true)
;
}
// My ORB.
public static ORB ourORB;
// My StockServer.
private StockServer myStockServer;
}
在 netbeans 中运行后，我得到以下信息:
@ server
run:
Generated stock symbols:
HDWB 79.99867
XITG 7.3477798
BLPP 48.922062
PDRK 89.32173
IQAQ 30.236895
ZSSE 2.7638085
XDAQ 39.625706
CEJD 93.04881
GCYC 64.20899
LMWN 6.168055
Couldn't bind StockServer: StockMarket.StockServerImpl cannot be cast to org.omg.CORBA.Object
BUILD SUCCESSFUL (total time: 27 seconds)
@ Client
run:
نوف 13, 2012 11:56:33 ص com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl <init>
WARNING: "IOP00410201: (COMM_FAILURE) Connection failure: socketType: IIOP_CLEAR_TEXT; hostname: 10.100.221.94; port: 900"
org.omg.CORBA.COMM_FAILURE: vmcid: SUN minor code: 201 completed: No
at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(ORBUtilSystemException.java:2200)
at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(ORBUtilSystemException.java:2221)
at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(SocketOrChannelConnectionImpl.java:223)
at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(SocketOrChannelConnectionImpl.java:236)
at com.sun.corba.se.impl.transport.SocketOrChannelContactInfoImpl.createConnection(SocketOrChannelContactInfoImpl.java:119)
at com.sun.corba.se.impl.protocol.CorbaClientRequestDispatcherImpl.beginRequest(CorbaClientRequestDispatcherImpl.java:185)
at com.sun.corba.se.impl.protocol.CorbaClientDelegateImpl.request(CorbaClientDelegateImpl.java:136)
at com.sun.corba.se.impl.resolver.BootstrapResolverImpl.invoke(BootstrapResolverImpl.java:99)
at com.sun.corba.se.impl.resolver.BootstrapResolverImpl.resolve(BootstrapResolverImpl.java:132)
at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(CompositeResolverImpl.java:47)
at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(CompositeResolverImpl.java:47)
at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(CompositeResolverImpl.java:47)
at com.sun.corba.se.impl.orb.ORBImpl.resolve_initial_references(ORBImpl.java:1170)
at StockMarket.StockMarketClient.connect(StockMarketClient.java:39)
at StockMarket.StockMarketClient.run(StockMarketClient.java:27)
at StockMarket.StockMarketClient.main(StockMarketClient.java:84)
Caused by: java.net.ConnectException: Connection refused: connect
at sun.nio.ch.Net.connect0(Native Method)
at sun.nio.ch.Net.connect(Net.java:364)
at sun.nio.ch.Net.connect(Net.java:356)
at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:623)
at java.nio.channels.SocketChannel.open(SocketChannel.java:184)
at com.sun.corba.se.impl.transport.DefaultSocketFactoryImpl.createSocket(DefaultSocketFactoryImpl.java:78)
at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(SocketOrChannelConnectionImpl.java:206)
... 13 more
Couldn't resolve StockServer: org.omg.CORBA.COMM_FAILURE: vmcid: SUN minor code: 201 completed: No
有人可以帮我解决这些问题吗？如果我从命令行运行这些，我在尝试编译 serverimpl 时会得到以下信息:-
G:\CORBA\StockMarket>javac StockServerImpl.java
StockServerImpl.java:21: error: cannot find symbol
extends StockServerPOA
^
symbol: class StockServerPOA
StockServerImpl.java:23: error: cannot find symbol
implements StockServer
^
symbol: class StockServer
StockServerImpl.java:85: error: cannot find symbol
public float getStockValue(String symbol) throws InvalidStockSymbolException
^
symbol: class InvalidStockSymbolException
location: class StockServerImpl
StockServerImpl.java:98: error: cannot find symbol
throw new InvalidStockSymbolException();
^
symbol: class InvalidStockSymbolException
location: class StockServerImpl
StockServerImpl.java:84: error: method does not override or implement a method f
rom a supertype
@Override
^
StockServerImpl.java:103: error: method does not override or implement a method
from a supertype
@Override
^
StockServerImpl.java:133: error: cannot find symbol
StockServer href = null;
^
symbol: class StockServer
location: class StockServerImpl
StockServerImpl.java:136: error: cannot find symbol
ORB orb = StockServerORBHelper.getORB(args);
^
symbol: variable StockServerORBHelper
location: class StockServerImpl
StockServerImpl.java:137: error: cannot find symbol
POA rootpoa = StockServerPOAHelper.getRoot(orb);
^
symbol: variable StockServerPOAHelper
location: class StockServerImpl
StockServerImpl.java:152: error: method servant_to_reference in interface POAOpe
rations cannot be applied to given types;
try { ref = rootpoa.servant_to_reference(stockServerImpl); }
^
required: Servant
found: StockServerImpl
reason: actual argument StockServerImpl cannot be converted to Servant by meth
od invocation conversion
StockServerImpl.java:156: error: cannot find symbol
try { href = StockServerHelper.narrow(ref); }
^
symbol: variable StockServerHelper
location: class StockServerImpl
StockServerImpl.java:199: error: method does not override or implement a method
from a supertype
@Override
^
StockServerImpl.java:206: error: method does not override or implement a method
from a supertype
@Override
^
StockServerImpl.java:213: error: method does not override or implement a method
from a supertype
@Override
^
StockServerImpl.java:219: error: method does not override or implement a method
from a supertype
@Override
^
StockServerImpl.java:225: error: method does not override or implement a method
from a supertype
@Override
^
StockServerImpl.java:231: error: method does not override or implement a method
from a supertype
@Override
^
StockServerImpl.java:237: error: method does not override or implement a method
from a supertype
@Override
^
StockServerImpl.java:243: error: method does not override or implement a method
from a supertype
@Override
^
StockServerImpl.java:249: error: method does not override or implement a method
from a supertype
@Override
^
StockServerImpl.java:255: error: method does not override or implement a method
from a supertype
@Override
^
21 errors
G:\CORBA\StockMarket>
最佳答案
看看这个 question ，它处理类似的异常。
客户端 ORB 似乎没有用于连接到 NamingService 的正确连接详细信息，默认情况下它假定 NamingService 正在监听端口 900。Sun/Oracle ORB 有许多预定义的 -ORB 属性当服务位于非默认位置时可以使用。
查看 -ORBInitRef 属性，Oracle ORB 的详细信息 here .
至于您在编译服务器代码时遇到的各种编译错误。看起来服务器端骨架代码(由 idl 编译器生成的服务器端代码)要么没有编译，要么在编译类路径中丢失，因此 java 编译器找不到它。
关于java - 为什么我的 CORBA 应用程序没有运行？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13358678/