我通过删除我的帖子打开了这个问题，在那里我错误地提出了问题，包括标题并没有提供太多信息。我的问题是线程请求，并且在某些情况下回复交换。
以下是应用程序weblogic日志和代码
从日志中我发现线程正在交换..下面是weblogic日志 说两个线程（7,8）处理两个portIds（1234,4567）
的performX（）<DEBUG> 2016-05-11 16:55:45,319 [ExecuteThread: '7'----] processing data for port id = 1234
<DEBUG> 2016-05-11 16:XX:YY,319 [ExecuteThread: '8'----] processing data for port id = 4567
<DEBUG> 2016-05-11 16:XX:YY [ExecuteThread: '7'----] ResponseQueue :: getResponse() :: ResponseQueue456
<DEBUG> 2016-05-11 16:XX:YY [ExecuteThread: '7'----] ResponseQueue :: getResponse() :: Reading Data from stream :: ResponseQueue456
<DEBUG> 2016-05-11 16:XX:YY [ExecuteThread: '7'----] ResponseQueue :: getResponse() :: Reading Data from stream completed :: ResponseQueue456
<DEBUG> 2016-05-11 16:XX:YY [ExecuteThread: '7'----]:: ReturnXML=<xml>---<order_number>4567</order_number> ---</xml>
<DEBUG> 2016-05-11 16:XX:YY [ExecuteThread: '7'----]:: Adding ordernumber as Key = 4567 value = ReturnXmlObjet1234
<DEBUG> 2016-05-11 16:XX:YY [ExecuteThread: '7'----]:: Getting object of port Key = 1234 value = null
<DEBUG> 2016-05-11 16:XX:YY [ExecuteThread: '8'----] ResponseQueue :: getResponse() :: ResponseQueue456
<DEBUG> 2016-05-11 16:XX:YY [ExecuteThread: '8'----] ResponseQueue :: getResponse() :: Reading Data from stream :: ResponseQueue456
<DEBUG> 2016-05-11 16:XX:YY [ExecuteThread: '8'----] ResponseQueue :: getResponse() :: Reading Data from stream completed :: ResponseQueue456
<DEBUG> 2016-05-11 16:XX:YY [ExecuteThread: '8'----]:: ReturnXML=<xml>---<order_number>1234</order_number> ---</xml>
<DEBUG> 2016-05-11 16:XX:YY [ExecuteThread: '8'----]:: Adding ordernumber as Key = 1234 value = ReturnXmlObjet4567
<DEBUG> 2016-05-11 16:XX:YY [ExecuteThread: '8'----]:: Getting object of port Key = 4567 value = ReturnXmlObjet1234
如果你看到线程7和线程8交换清楚，因为线程7的映射值为null，我们将抛出特定于应用程序的错误。 下面是代码。如何避免这种情况。
我正在抽象实时生产代码和日志。
Class A{
----
B bobj = B.getInstance()
Map map = new HashMap();
public void performX(String portid){
logger.debug("Processing data for portId = "+ portId);
returnXml = bobj.getResponse(); // bobj is a singleton
logger.debug("returnXML ="+ retunrXML);
ReturnXmlObjet r_obj = convertToObject(returnXMl);
// retunrXml contain a field orderNumber which must be same as
// portid method parameter
if(r_obj != null){
logger.debug("Adding ordernumber as Key = "+ r_obj.getOrderNumber()+ "Value is =" + r_obj);
map.put(r_obj.getOrderNumber,r_obj);
}
r_obj = map.get(portid);
logger.debug("Getting object of port Key = "+ r_obj.getOrderNumber()+ "Value is =" + r_obj);
if(r_obj == null){
throw new ApplicationSpecificException("Not able to get Response");
}
}
}
Class B(){
B instance = null;
public static synchronized BgetInstance() throws AboxRetryException {
if (instance == null) {
instance = new B();
}
return instance;
}
public synchronized String getResponse() {
logger.debug(" ResponseQueue :: getResponse() :: "+ this);
String returnXML = null;
String strResponseACK;
InstantLinkXML ilXML = new InstantLinkXML();
try {
logger.debug(" ResponseQueue :: Reading Data from stream :: "+ this);
returnXML = in.readLine();
logger.debug(" ResponseQueue :: Reading Data completed from stream :: "+ this);
} catch (IOException ioe) {
logger.error("Failure getting Response");
} catch(Exception e){
logger.error(e.getMessage());
}
if (returnXML != null) {
// Send ACK
strResponseACK = ilXML.getxxx();
out.println(strResponseACK);
}
//code to convert XML to Java object.. ReturnObject has a property port_db
return returnXML;
}
Below is the code for *in* object initialization. This login() method is called in the class constructor where getResponsed() method is written
public String logIn() {
String returnXML = null;
try {
String strUser = ConfigItemsAccess.getConfigItems("o2.xxx.user");
String strPass = ConfigItemsAccess.getConfigItems("o2.xxx.password");
String strServer = ConfigItemsAccess.getConfigItems("o2.xxx.server");
int iPort = Integer.parseInt(ConfigItemsAccess.getConfigItems("o2.xxx.respport"));
logger.debug("logIN :: strUser="+strUser+" strPass="+strPass+" strServer="+strServer+ " iport = "+ iPort );
String strLoginRequest;
String strLoginAck;
InstantLinkXML ilXML = new InstantLinkXML();
try {
XXXSocket( Just a SOCKET object abstracted according to application) = new Socket(strServer, iPort);
xxxSocket.setKeepAlive(true); //new
out = new PrintWriter(xxxSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(xxxSocket.getInputStream()));
} catch (UnknownHostException e) {
logger.error("Cannot connect to host: " + e.getMessage());
} catch (IOException e) {
logger.error("Couldn't get I/O for the connection to:" + strServer + ":" + iPort);
// Connect to Secondary Server
strServer = ConfigItemsAccess.getConfigItems("o2.xxx.server.backup");
try {
logger.debug("Connecting to Secondary Server: " + strServer);
xxxSocket = new Socket(strServer, iPort);
xxxSocket.setKeepAlive(true); //new
out = new PrintWriter(xxxSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(xxxSocket.getInputStream()));
} catch (UnknownHostException e2) {
logger.error("Cannot connect to host: " + e2.getMessage());
}
}
} catch (IOException e2) {
logger.error("Couldn't get I/O for the Secondary connection to:" + strServer + ":" + iPort);
}
} catch(Exception e){
logger.error(e.getMessage());
}
strLoginRequest = ilXML.getLogInRequest(strUser, strPass);
out.println(strLoginRequest);
try {
strLoginAck = in.readLine();
returnXML = strLoginAck;
} catch (IOException ioe) {
logger.error("Failure getting Comptel Ack back");
} catch(Exception e){
logger.error(e.getMessage());
}
}
catch (FinderException Ex) {
logger.error("FinderException trying to get o2.xxx from CONFIGITEMS\n" + Ex.getMessage());
throw new java.lang.NullPointerException("Exception trying to get config items");
}
catch (Exception e){
logger.error(e.getMessage());
}
return returnXML;
}
ilXML.getLogInRequest(String strUser, String strPass){
return ("<Message version=\"SAS3\">\n" + " <LOGIN\n" + " LOGIN=\""
+ strUser + "\"\n" + " PASSWORD=\"" + strPassword + "\"/>\n" + "</Message>\n");
}
套接字从EjbApplication（JAR文件）中读取信息
请帮助我，这个问题可能是根本原因，我该如何解决？ 让我知道还需要更多信息。
答案 0 :(得分：1)
看起来returnXml是在方法之外声明的。当你调用getResponse（）时，你会覆盖之前的任何内容。