Problem in recognising instance variables declared in the class
Hi all,
I am trying to deploy an Servlet desiged in WebObjects5.1 application server on application on Iplanet Application server 6.5
Back ground: All of you might be aware that WebObjects5.1 is an J2ee compliant application server. When an application is designed in WebObjects, it creates a WAR file which can be deployed on any J2ee complaint application server.
I tried to create such application in WebObjects and tried to deploy on IplanetApplication server6.5(running on Windows using IIS web server).
I am able to successfully deploy the application. But inorder to do this i had to manually add ias-Web.xml file to the war file generated( gave some arbitrary global id). The aplication just consists some string displaying hello world.
Now when i try to deploy an application which has some instance variables, the instance variables are not getting recognised. This application works fine on WebObjects5.1. But variables are not getting recognised when deployed iplanet application server
Has any one faced such kind of problem earlier? If yes please help me out
Thanks
Venkatesh
Hi,
Please send me your servlet code and war file.
Thanks
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import java.util.*;
import java.io.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;
The SupportMatrix class provides static variables and methods to simplify
the determination of whether or not a given attribute is supported for a
certain object type (queue manager, channel, etc.), depending on the version
and platform of the queue manager to which it belongs.
The SupportMatrix class may not be instantiated. Its constructor is private.
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apply to all platforms. -->
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The inner classes, and their hierarchical relationships are as follows:
SupportObject - corresponds to the <object> element. Stored in a static HashMap, and
keyed by classid.
VersionObject - corresponds to the <version> element. Stored in a HashMap instance
variable of the SupportObject class, keyed by cmdlevel.
AttributeObject - corresponds to the <attr> element. Stored in a HashMap instance
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PlatformObject - corresponds to the <support> element. Stored in HashMaps belonging
to the AttributeObjects, keyed by platform. A single PlatformObject
instance is created when the support tag is encountered. The
"platforms" attribute of the support element is then processed. For
each platform in the comma-delimited list, an entry is added to the
collection of PlatformObjects. This is to greatly simplify later
lookups.
In order to support the 'include' feature of object and version elements, certain
functions are recursive. If the attribute to be validated is not found for the passed
cmdlevel, the 'parent' VersionObject is consulted by means of the 'include' value. If
the chain of VersionObjects has been exhausted and the attribute in question has still not
been located, the next SupportObject in the chain is consulted in a similar fashion.
public class SupportMatrix extends DefaultHandler {
/** The objects collection holds all the SupportObjects, keyed by classid. */
private static HashMap objects;
/** xmlFile will name the xml document to be parsed. Note that using the
default class loader expects the string to be the path to the file. It must
NOT begin with the '/' character. */
private static String xmlFile =
ResourceManager.getApplicationProperties().getProperty("SupportMatrixFile");
private Stack stack;
/** This static initializer allocates the static objects collection, creates an
instance of the SupportMatrix class for xml parsing purposes, and initiates
the parse operation to populate the collection. */
static {
objects = new HashMap();
// Create a parser and process the xml doc
SupportMatrix handler = new SupportMatrix();
InputSource is = null;
try {
is = new InputSource(ClassLoader.getSystemClassLoader().getResourceAsStream(xmlFile));
XMLReader xmlReader =
SAXParserFactory.newInstance().newSAXParser().getXMLReader();
xmlReader.setFeature("http://xml.org/sax/features/namespaces", true);
xmlReader.setContentHandler(handler);
if (is == null) {
System.err.println("No input stream, dammit");
xmlReader.parse(is);
} catch(Exception e) {
e.printStackTrace();
/** Private constuctor, used only for XML parsing. */
private SupportMatrix() {
stack = new Stack();
/** Add a SupportObject instance to the objects collection. */
private void addObject(SupportObject obj) {
String key = obj.getClassId();
objects.put(key, obj);
/* DefaultHandler methods */
/** Not used. */
public void characters(char[] ch, int start, int length) {}
/** Not used. */
public void endDocument() {}
/** For the version, object, and attr elements, pop the top element of the stack. */
public void endElement(String uri, String localName, String qName) {
if (localName.equals("version") || localName.equals("object") || localName.equals("attr")) {
stack.pop();
/** Not used. */
public void setDocumentLocator(Locator locator) {}
/** Not used. */
public void startDocument() {}
/** Most of the work is done here. Create the appropriate inner class instance for
element; for object, version, and attr, push the element onto the stack so that
child elements may be added to their collections as needed. */
public void startElement(String uri, String localName, String qName,
Attributes attributes) {
String include = attributes.getValue("include");
if (localName.equals("object")) {
SupportObject obj = new SupportObject(attributes.getValue("classid"), include);
addObject(obj);
stack.push(obj);
} else if ( localName.equals("version")) {
VersionObject ver = new VersionObject(attributes.getValue("cmdlevel"), include);
((SupportObject)stack.peek()).addVersion(ver);
stack.push(ver);
} else if ( localName.equals("attr")) {
AttributeObject a = new AttributeObject(attributes.getValue("id"));
//String desc = StringFactory.getString(attributes.getValue("desc"));
//if(desc != null)
// a.setAttribute();
String readonly = attributes.getValue("readonly");
String exclude = attributes.getValue("exclude");
if (include != null && exclude != null) {
Log.log(Log.ERROR, this, "include and exclude are mutually exclusive, exclude value ignored");
exclude = null;
if (include != null) {
a.setCondition(include, true);
if (exclude != null) {
a.setCondition(exclude, false);
if (readonly != null)
a.setReadonly(readonly.equals("y"));
((VersionObject)stack.peek()).addAttr(a);
stack.push(a);
} else if (localName.equals("support")) {
String platforms = attributes.getValue("platforms");
String readonly = attributes.getValue("readonly");
String maxlen = attributes.getValue("maxlen");
String type = attributes.getValue("type");
int attrType = 0;
if (type != null) {
if (type.equals("MQCFIN")) {
attrType = CMQCFC.MQCFT_INTEGER;
} else if (type.equals("MQCFIL")) {
attrType = CMQCFC.MQCFT_INTEGER_LIST;
} else if (type.equals("MQCFST")) {
attrType = CMQCFC.MQCFT_STRING;
} else if (type.equals("MQCFSL")) {
attrType = CMQCFC.MQCFT_STRING_LIST;
} else if (type.equals("EXBIN")) {
attrType = MqcConstants.EXCFT_BINARY;
} else if (type.equals("EXPCF")) {
attrType = MqcConstants.EXCFT_PCF;
PlatformObject p = null;
if (readonly == null) {
p = new PlatformObject(platforms);
} else {
p = new PlatformObject(platforms, readonly.equals("y"));
String exclude = attributes.getValue("exclude");
if (include != null && exclude != null) {
Log.log(Log.ERROR, this, "include and exclude are mutually exclusive, exclude value ignored");
exclude = null;
if (include != null)
p.setCondition(include, true);
if (exclude != null)
p.setCondition(exclude, false);
if (attrType != 0)
p.setType(attrType);
if (maxlen != null)
p.setLen(Integer.parseInt(maxlen));
((AttributeObject)stack.peek()).addPlatform(p);
public static boolean isExported(int attribute, TopologyModelNode node) {
String name = ResourceManager.getAttributeName(attribute);
return isExported(name, node);
public static boolean isExported(String attribute, TopologyModelNode node) {
// Find the qmgr node to fetch platform and cmdlevel
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// If there's no qmgr for this node, it must be one of 'ours'.
if (qmgr == null)
return false; // None of 'our' objects can be exported to MQSC.
String classId = node.getClassId();
String cmdLevel = qmgr.getAttributeValue("MQIA_COMMAND_LEVEL");
String platform = qmgr.getAttributeValue("MQIA_PLATFORM");
return isExported(attribute, classId, cmdLevel, platform, node);
public static boolean isExported(int attribute, String classId, String cmdLevel, String platform,
TopologyModelNode node) {
String name = ResourceManager.getAttributeName(attribute);
return isExported(name, classId, cmdLevel, platform, node);
/** Determine if an attribute is exportable. The attribute name, the classid of the object to
which it belongs, plus the command level and platform of the queue manager are all needed
to make this determination.
Start by finding the AttributeObject for the combination of attribute, classid, and
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is not exported. Otherwise, find out if it is exportable for the selected platform.
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TopologyModelNode node) {
AttributeObject attr = getAttributeObject(attribute, classId, cmdLevel);
if (attr == null) {
return false;
} else {
return attr.isExported(platform, node);
public static boolean isSupported(int attribute, TopologyModelNode node) {
String name = ResourceManager.getAttributeName(attribute);
return isSupported(name, node);
public static boolean isSupported(String attribute, TopologyModelNode node) {
// Find the qmgr node to fetch platform and cmdlevel
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// If there's no qmgr for this node, it must be one of 'ours'.
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String classId = node.getClassId();
String cmdLevel = qmgr.getAttributeValue("MQIA_COMMAND_LEVEL");
String platform = qmgr.getAttributeValue("MQIA_PLATFORM");
return isSupported(attribute, classId, cmdLevel, platform);
public static boolean isSupported(int attribute, String classId, String cmdLevel, String platform) {
String name = ResourceManager.getAttributeName(attribute);
return isSupported(name, classId, cmdLevel, platform);
/** Determine if an attribute is supported. The attribute name, the classid of the object to
which it belongs, plus the command level and platform of the queue manager are all needed
to make this determination.
Start by finding the SupportObject for the classid. If it isn't there, we make the assumption
(for now) that the attribute is supported. The only classids for which this can occur are
broker, agent, and the various container objects.
Propagate the isSupported request to the chain of SupportObjects (based on 'include' values)
until we get a 'true' result or we run out of SupportObjects. */
public static boolean isSupported(String attribute, String classId, String cmdLevel, String platform) {
if (attribute == null)
return false;
SupportObject obj = (SupportObject)objects.get(classId);
// If the object type isn't even in the support matrix, we interpret that to
// mean that it's a Broker or Agent, in which case all attributes are supported
// at present.
if (obj == null)
return true;
boolean result = false;
while (result == false && obj != null) {
result = obj.isSupported(attribute, cmdLevel, platform);
if (result == false && obj.getInclude() != null) {
obj = (SupportObject)objects.get(obj.getInclude());
} else
obj = null;
return result;
/** Locate an AttributeObject for a given attribute name, object type, and command level.
This is a helper function for the getMaxLen and getType methods. */
private static AttributeObject getAttributeObject(String attr, String classID, String cmdLevel) {
AttributeObject result = null;
SupportObject obj = (SupportObject)objects.get(classID);
while (result == null && obj != null) {
result = obj.getAttr(attr, cmdLevel);
if (result == null && obj.getInclude() != null) {
obj = (SupportObject)objects.get(obj.getInclude());
} else
obj = null;
return result;
/** Determine the maximum length for a given combintation of attribute name, object type,
command level, and platform. If the AttributeObject can't be found, or if the length
hasn't been set, return -1. */
public static int getMaxLen(String attr, String classId, String cmdLevel, String platform) {
AttributeObject a = getAttributeObject(attr, classId, cmdLevel);
if (a == null)
return -1;
return a.getMaxLen(platform);
/** Determine the PCF parm type for a given combintation of attribute name, object type,
command level, and platform. If the AttributeObject can't be found, or if the length
hasn't been set, return -1. */
public static int getType(String attr, String classId, String cmdLevel, String platform) {
AttributeObject a = getAttributeObject(attr, classId, cmdLevel);
if (a == null)
return -1;
return a.getType(platform);
/** Inner class to contain platform-specific info for an attribute. */
class PlatformObject {
/** This instance variable will contain the comma-delimited string of all
platforms to which this object applies. */
private String platform;
private int maxlen;
private String condition = null;
private boolean include;
private boolean readonly;
private boolean lenSet;
private int attrType;
private boolean typeSet;
public PlatformObject(String p, boolean readonly) {
platform = p;
this.readonly = readonly;
lenSet = false;
typeSet = false;
public PlatformObject(String p) {
this(p, false);
public void setCondition(String condition, boolean include) {
this.condition = condition;
this.include = include;
public boolean isReadonly() {
return readonly;
public boolean isExported(TopologyModelNode node) {
if (condition != null) {
boolean test = false;
try {
test = Utilities.evaluateCondition(node, condition);
} catch (Exception e) {}
if (include ^ test)
return false;
return !readonly;
public void setLen(int len) {
maxlen = len;
lenSet = true;
public void setType(int type) {
attrType = type;
typeSet = true;
public String getPlatform() {
return platform;
public int getMaxLen() {
if (!lenSet)
return -1;
return maxlen;
public int getType() {
if (!typeSet)
return -1;
return attrType;
/** This class represents a specific MQSeries attribute. It can optionally contain
instances of the PlatformObject class as needed. When the 'platforms' collection
is empty, the attribute is supported on all platforms. It is also possible to
include a PlatformObject for the 'all' platform, if specific attribute characteristics
need representation. When the 'platforms' collection is non-empty, it will include one
entry for each platform where the attribute is supported. */
class AttributeObject {
private String attribute;
private String attrValue;
private HashMap platforms;
private String condition = null;
private boolean include;
private boolean readonly = false;
public AttributeObject(String a) {
this(a, false);
public AttributeObject(String a, boolean readonly) {
attribute = a;
platforms = new HashMap();
this.readonly = readonly;
public void setCondition(String condition, boolean include) {
this.condition = condition;
this.include = include;
public void setReadonly(boolean readonly) {
this.readonly = readonly;
public boolean isReadonly() {
return readonly;
public void addPlatform(PlatformObject p) {
for (StringTokenizer st = new StringTokenizer(p.getPlatform(), ","); st.hasMoreTokens() ;) {
platforms.put(st.nextToken(), p);
public PlatformObject getPlatform(String platform) {
PlatformObject p = (PlatformObject)platforms.get(platform);
if (p == null)
p = (PlatformObject)platforms.get("all");
return p;
public String getAttribute() {
return attribute;
public int getMaxLen(String platform) {
PlatformObject p = getPlatform(platform);
if (p == null)
return -1;
return p.getMaxLen();
public int getType(String platform) {
PlatformObject p = getPlatform(platform);
if (p == null)
return -1;
return p.getType();
public boolean isSupported(String platform) {
if (platforms.isEmpty()) {
return true;
if (platforms.containsKey(platform)) {
return true;
if (platforms.containsKey("all")) {
return true;
return false;
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if (readonly) {
Log.log(Log.DEBUG, this, attribute + " is readonly, returning false");
return false;
if (condition != null) {
Log.log(Log.DEBUG, this, "Testing condition = " + condition);
boolean test = false;
try {
test = Utilities.evaluateCondition(node, condition);
Log.log(Log.DEBUG, this, "Condition result is " + test);
} catch (Exception e) {
Log.log(Log.ERROR, this, "Condition through an exception");
if (include ^ test)
return false;
if (platforms.isEmpty()) {
return true;
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if (p == null) {
Log.log(Log.DEBUG, this, platform + " not found for " + attribute + ", returning false");
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this.cmdLevel = cmdLevel;
this.include = include;
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attributes.put(attr.getAttribute(), attr);
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return (AttributeObject)attributes.get(attr);
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return cmdLevel;
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return include;
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AttributeObject obj = (AttributeObject)attributes.get(attr);
if (obj == null) {
return false;
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that described for the VersionObject. The traversal of that hierarchy is delegated
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is a static variable of the SupportMatrix class. */
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private String classId;
private String include;
private HashMap versions;
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this.classId = classId;
this.include = include;
versions = new HashMap();
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if (result == null && obj.getInclude() != null)
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}Are you the one who commented out the code you're looking for ?//String desc = StringFactory.getString(attributes.getValue("desc"));You just have to modify you AttributeObject class to hold a new field : String description. And then, it's up to you to create a new constructor or a new setter method.
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at OMSDeviceContextPane.initComponents(OMSDeviceContextPane.java:107)
at OMSFrame.jomInit(Compiled Code)
at JOMCountFrame.init(JOMCountFrame.java:190)
at JOMCountFrame.run(JOMCountFrame.java:253)
at java.lang.Thread.run(Thread.java:485)
Any help is appreciated.
- Mahan.in jdk1.2.2 no need classes12.zip in class path.
just set CLASSPATH=.;
that is enough for solving ur problem
bye
raghu -
Sub class will allocate seperate memory for super class instance variable?
class A
int i, j;
void showij()
System.out.println("i and j: " + i + " " + j);
class B extends A
int k;
void showij()
System.out.println("i and j: " + i + " " + j);
what is size of class B will it be just 4 byte for k or 12 bytes for i, j and k ?
will be a seperate copy of i and j in B or address is same ?
thank uamit.khosla wrote:
just to add on...if you create seprate objects of A and B, so the addresses will be different. We cant inherit objects, we inherit classes. It means if you have an object of A and another object of B, they are totally different objects in terms of state they are into. They can share same value, but its not compulsary that they will share same values of i &j.
Extending A means to making a new class which already have properties & behaviour of A.
Hope this help.That is very unclear.
If you create two objects, there will be two "addresses", and two sets of member variables.
If you create one object, there will be one "address", and one complete set of non-static member variables that is the union of all non-static member variables declared in the class and all its ancestor classes. -
Problem with variables declared as private?
Hi all,
I am currently having a very weird problem when i am running one of the JSP application deployed using weblogic.
I have a variable x and is declared as private.
By looking at the log file of every transaction done by the users, i can't trace the problem out.
Supposingly, the x variable should return a value=2, but somehow it always return a 3.
I confirmed that the value should be 2 rather than 3...When i see the log file, there is another user doing the same transaction as well, is there any possibility that, the value is being overwritten??
Hopefully, all of you are able to understand what i wrote.Hi Stevejluke, thanks for the reply.
Actually the logic of the application goes in this way.
I am making use of the EJB, I declare the Entity Bean class at the JSP, then lookup and home create.
As for the variable x, its actually declared in the class as private, and in my jsp i have already declare threadsafe for the classes......
In this case, i found out something in my log file and have done testing concurrently.
To quote a scenario, let's say 2 people are accessing test.jsp at the same time, and test.jsp will forward to test1.jsp, test2.jsp before processing.
Person A login, goes to test.jsp
Person B then login, goes to test.jsp as well
Person A typed in something and goes to test1.jsp, then to test2.jsp, variable x now has the value of 3.
Person B typed in something and goes to test1.jsp, then test2.jsp, variable x should be 2, but it got the value of 3.
BUT if...............
Person A typed in something and goes to test1.jsp, then to test2.jsp, variable x now has the value of 3 and then processed and redirect back to main page.
Person B typed in something and goes to test1.jsp, then test2.jsp, variable x now is 2.
Person B processed the test2.jsp after Person A has finished processing.
Weird thing is, these 2 people are using different IE, but same weblogic server, and the console printed out some msg to indicate the values. May i know how can i solve this problem?
FYI, i actually changed to TestA test = new TestA();
then called the function test.executeA();
The variable x which is declared in Test A, holds the new value.
But if i do it in this way:
private Test A test=null;
forgotten the syntax of the new Context()..but roughly typed here....
Aftter the new context being created, home being looked up..
test = (TestA) narrow(home.create............
the variable x in TestA somehow doesnt change the value
This way of declaration will have the problem... -
Template declaration error when variable assigned is the same as variable declared
Hi Fedor,
In comm-central repository, when compiling mozilla/mfbt/Compression.cpp using -std=c++11, it results in an error as follows:
"../dist/include/mozilla/CheckedInt.h", line 400: Error: Unexpected type name "T" encountered.
"../dist/include/mozilla/CheckedInt.h", line 400: Error: value is not defined.
"../dist/include/mozilla/CheckedInt.h", line 400: Error: No direct declarator preceding ">".
"../dist/include/mozilla/CheckedInt.h", line 400: Error: A declaration does not specify a tag or an identifier.
"../dist/include/mozilla/CheckedInt.h", line 400: Error: Default template argument cannot be specified on the definition of a class template member that appears outside of its class.
"../dist/include/mozilla/CheckedInt.h", line 400: Error: Templates can only declare classes or functions.
"../dist/include/mozilla/CheckedInt.h", line 413: Error: No primary specialization for partial specialization NegateImpl<T, 0>.
"../dist/include/mozilla/CheckedInt.h", line 416: Error: Too many arguments for template mozilla::detail::NegateImpl<T>.
8 Error(s) detected.
After a check on the file CheckedInt.h, it was narrowed down to the following code that resulted in the failure (the variable assigned, isSigned is the same as variable being declared) :
template<typename T, bool IsSigned = IsSigned<T>::value>
struct NegateImpl;
This code, however compiles without problems in gcc-4.8.
A workaround was to use a different variable declared in the template (e.g. bool IsTSigned = IsSigned<T>). But I just wanted to be sure whether is this a bug in 12.4 Beta or whether coding rules in templates do allow this kind of declaration? Kindly advise. Thanks.
Regards,
BrianHi Steve,
The declaration made below is not valid when -std=c++11 is not used (it causes the same compile-time errors when using July Refresh):
template<typename U> class IsSigned;
template<typename T, bool IsSigned = IsSigned<T>::value>
struct NegateImpl;
So far, the workaround was to use a different variable declared in the template (e.g. bool IsTSigned = IsSigned<T>).
Regards,
Brian -
How to wash out an AM instance variable at the end of user session (logout)
We have a need to create AM instance variables to hold some session level data, which is too complex to be held in a transient VO.
What we observed is that the instance variable is not washed out at the end of the user session (i.e logout).
I think since the AM instance is not really destroyed but only release back to the pool the instance variable content persists and is carried over to the next session that access the AM instance.
What method in AM can be overridden to wash out this instance variable.
At the moment we are resetting it in prepareSession(), but this means that the information is still held till the next session access the AM.
It would be better to reset it when the AM is released back to the pool.
Any pointers would be helpful.At the moment we are resetting it in prepareSession(), but this means that the information is still held till the next session access the AM.
Note that prepareSession() is also invoked after AM activation so this can(and probaly will) reset your variable inside existing session.
If you don't need to keep variable value between AM activations/passivations, you can use userData, for example:
this.getSession().getUserData().put("someKey", value);
UserData values are lost after AM passivation (by default).
If you need to keep UserData variable value for lifetime of user session, then you can override passivateState() and activateState() as in this sample:
Application State Management
Dario -
Why can't i edit the variable declaration in Netbeans GUI Applications?
When i drag and drop jbutton,jlabel and other tools from toolbox on the jform the code is
automatically generated by the Netbeans.
At bottom the variable declaration for the jbutton and for the other tools is automatically
generated.
The part of that declaration is shaded as grey.
Is it possible to edit those variables from Netbeans?Yup, as Chuck states, it is possible to edit that region of code, since the file is nothing more than a text file, but doing so "breaks" the code so that you cannot modify the GUI content in NetBeans WYSIWYG form editor. Please note, that there are ways of changing the characteristics of those variables without editing them directly. You should look into how to change properties of your GUI with NetBeans. The online tutorials can show you how.
-
How to use an BPM Instance Variable in JSP page
Hi All,
I am using the JSP Presentation, but i don't know how to use an Instance variable in JSP page, that instance already declared in the process. And Can u explain the syntax that to include the JS file into jsp page
Regards
Vasu.
Edited by bpmvasu at 04/03/2007 10:43 PMHi Mariano,
I'm using JSP presentation too. In "Interactive Component Call" active i'm using "Use JSP presentation", but i only can define one instance variable, i need to add more instance variables. In "Advanced" option of this task, i have the argument mapping .. but i don't understand how to use it.
I have a instance variable called "genders" of the type String[Int] (Associative Array) and i'm mapping this instance variable in "Arguments Show In" option of the advanced option of JSP presentation. In JSP presentation i have the code:
<select <f:fieldName att="person.gender"/>>
<c:forEach var="gender" begin="0" items="${genders}" varStatus="status">
<c:choose>
<c:when test="${person.gender == gender}">
<option value="<c:out value="${gender}"/>" selected="true"><c:out value="${gender}"/></option>
</c:when>
<c:otherwise>
<option value="<c:out value="${gender}"/>"><c:out value="${gender}"/></option>
</c:otherwise>
</c:choose>
</c:forEach>
</select>And in my screenflow i have the code:
genders[0] = "Male"
genders[1] = "Female"But when i run my application, i have the error: "The task could not be successfully executed. Reason: 'java.lang.ClassCastException: java.lang.Integer'."
What's the problem? -
Do synthesized instance variables work in iPhone SDK?
I tried using Obj-C properties to synthesize not only the accessor methods, but also the instance variable. I ended up with an error saying something like "...must explicitly name an ivar...".
I was under the impression the iPhone ran the modern (64-bit) Objective-C runtime. I'm using xCode 3.x and iPhone SDK 2.2. Are synthesized instance variables not supported, or do I need to change some xCode/project configuration settings to activate this support (I'd really like to use it)?
Does the fact that I'm linking to the Sen Test Kit Framework, or running on a relatively old Intel MacBook Pro cause this problem? If the 2.2 SDK does not support synthesized instance variables, does iPhone SDK 3.0 beta support them?
Note that I would need the synthesized ivar support to work on the iPhone simulator too (obviously) so that I can do testing. Hopefully the iPhone simulator supports the modern Obj-C 2.0 runtime.
Thank You,
Ericorangekay wrote:
A. I don't see that anywhere in the Objective-C 2.0 language specification, so I don't believe this has anything to do with the iPhone SDK.
B. I don't see any point in adding such a thing to the language as it accomplishes nothing that could not be handled with a standard ivar declaration.
This sounds like a feature you imagined.
Yeah, right I imagined it. Get a clue, will you?
http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/Articles/oc Properties.html#//apple_ref/doc/uid/TP30001163-CH17-SW3
In general the behavior of properties is identical on all runtimes (see Runtime Versions and Platforms in Objective-C 2.0 Runtime Programming Guide). There is one key difference: the modern runtime supports instance variable synthesis whereas the legacy runtime does not.
For @synthesize to work in the legacy runtime, you must either provide an instance variable with the same name and compatible type of the property or specify another existing instance variable in the @synthesize statement. With the modern runtime, if you do not provide an instance variable, the compiler adds one for you. For example, given the following class declaration and implementation:
@interface MyClass : NSObject {
float sameName;
float otherName;
@property float sameName;
@property float differentName;
@property float noDeclaredIvar;
@end
@implementation MyClass
@synthesize sameName;
@synthesize differentName=otherName;
@synthesize noDeclaredIvar;
@end
the compiler for the legacy runtime would generate an error at @synthesize noDeclaredIvar; whereas the compiler for the modern runtime would add an instance variable to represent noDeclaredIvar. -
Scope of instance variables in servlets..
Hi all,
Sorry for asking a dumb question..
What is the scope of instance variables in a servlet? Is the scope is
limited to thread?
In other words, in the following example, i am setting "testStr", in one
request and when i tried to access the same instance variable from another
request, i am getting it as null. Does it mean instance variable is limited
to that particular thread/request?
thanks in advance..
-ramu
Oops ... I had misunderstood and had the problem backwards ;-)
> Is it known behavior? With registered servlet its working fine (a
> instance variable is shared by all requests)
I believe so; I typically deploy in a WAR so have not seen the problem that
you describe. Servlets can be reloaded, so what you saw could have been
caused bye a date/time mismatch between the .class file and the server's
current time. On the other hand, that could be how WebLogic works.
Peace,
Cameron Purdy
Tangosol, Inc.
http://www.tangosol.com
+1.617.623.5782
WebLogic Consulting Available
"Ramu" <[email protected]> wrote in message
news:[email protected]...
> Hi Purdy,
>
> I got it. I am testing the servlet as a unregistered servlet, which is
> creating instance for every new request!!!, which created this whole
> confusion. Is it known behavior? With registered servlet its working fine
(a
> instance variable is shared by all requests)
>
> > What theory? ;-) Instance variables are on the object, and the object
can
> > be used by multiple threads, thus allowing multiple threads to access
the
> > same instance variables.
> what i mean by theory here is, all instance variables in servlet should
be
> shared by all requests. Now i got it sir.
>
> Thank you..
> -ramu
>
>
> >
> > Peace,
> >
> > --
> > Cameron Purdy
> > Tangosol, Inc.
> > http://www.tangosol.com
> > +1.617.623.5782
> > WebLogic Consulting Available
> >
> >
> > "Ramu" <[email protected]> wrote in message
> > news:[email protected]...
> > > Hi,
> > >
> > > > No, an instance variable in a servlet class is not limited to a
> thread.
> > > There
> > > > is exactly one copy of the servlet created in memory and all
requests
> > pass
> > > > through the same instance, thus sharing any instance variables. A
> > couple
> > > of
> > > > things to remember:
> > > I totally agree with you, But i am wondering why my sample servlet(i
am
> > > attaching the file) is not sharing the instance variables across
> > > threads/reqs. (in 1st request set some string to "testStr" instance
> > > variable, in next request if you read the same instance variable, you
> will
> > > get null!!)
> > > Our current code is having instance variables. But right now we are
not
> > > getting any problems. But as per theory, instance variables should be
> > shared
> > > across threads/requests..
> > >
> > > Any how we are changing our code to remove all instance variables.
> > >
> > > thanks,
> > > -ramu
> > >
> > > >
> > > > 1.) Using instance or class variables in servlets that are not
> read-only
> > > is not
> > > > a good thing to do. This makes the servlet not thread-safe. To
> > maintain
> > > > variables across requests, sessions, etc., use the servlet-defined
> > objects
> > > to
> > > > store the state (e.g., request, session, etc.).
> > > >
> > > > 2.) If you modify the servlet class on disk, WebLogic will reload
the
> > > servlet
> > > > class thus discarding the old instance and creating a new one (of
> > course,
> > > this
> > > > depends on some configuration parameters for servlet reloading).
> > > >
> > > > Hope this helps,
> > > > Robert
> > > >
> > > > Ramu wrote:
> > > >
> > > > > Hi,
> > > > > thanks for quick reply.
> > > > > I am not at all using SingleThreadModel. See the following code.
> > > > > In first request i am passing "abc" value to testStr. But in
second
> > > request,
> > > > > I am getting null for testStr in second request. It looks like
(for
> > me)
> > > for
> > > > > non single threaded model also, scope of instance variables is
> > limited
> > > to
> > > > > Thread/Request.. But as per theory, because its not single
threaded
> > > model,
> > > > > only one instance should be there AND testStr(instace variables)
> > should
> > > be
> > > > > shared across the all threads. But i am not able see that
behaviour
> > > here.
> > > > > But if declare instance variable as static, o am able to share
it
> > > across
> > > > > all threads/requests.
> > > > >
> > > > > note:
> > > > > From browser i am setting testStr to "abc" with URL like
> > > > > "localhost/test1?testStr=abc"
> > > > > And 2nd req from browser is like "localhost/test1" (on server
> output
> > i
> > > am
> > > > > getting null for testStr)
> > > > >
> > > > > Any ideas?
> > > > >
> > > > > thanks,
> > > > > -ravi
> > > > >
> > > > > import java.io.*;
> > > > > import javax.servlet.*;
> > > > > import javax.servlet.http.*;
> > > > >
> > > > > public class test1 extends HttpServlet
> > > > > {
> > > > > public String testStr;
> > > > >
> > > > > public void doGet (HttpServletRequest req, HttpServletResponse
res)
> > > > > throws ServletException, IOException
> > > > > {
> > > > > doPost(req, res);
> > > > > }
> > > > >
> > > > > public void doPost (HttpServletRequest req,
HttpServletResponse
> > res)
> > > > > throws ServletException, IOException
> > > > > {
> > > > > try {
> > > > > res.setContentType("text/html");
> > > > > PrintWriter out = res.getWriter();
> > > > > if(req.getParameter("testStr") != null)
> > > > > {
> > > > > testStr = req.getParameter("testStr");
> > > > > System.out.println("set testStr = " + testStr);
> > > > > }
> > > > > else{
> > > > > System.out.println("get testStr = " + testStr);
> > > > > }
> > > > >
> > > > > }
> > > > > catch(Exception e){
> > > > > e.printStackTrace();
> > > > > }
> > > > >
> > > > > }
> > > > > }
> > > > >
> > > > > "Cameron Purdy" <[email protected]> wrote in message
> > > > > news:[email protected]...
> > > > > > Yes or no, depending on if your servlet implements
> > SingleThreadModel.
> > > > > >
> > > > > > See the servlet 2.2 spec for documentation on how many instances
> of
> > a
> > > > > > servlet will be created. See the doc for the SingleThreadModel
> > > interface.
> > > > > >
> > > > > > Peace,
> > > > > >
> > > > > > --
> > > > > > Cameron Purdy
> > > > > > Tangosol, Inc.
> > > > > > http://www.tangosol.com
> > > > > > +1.617.623.5782
> > > > > > WebLogic Consulting Available
> > > > > >
> > > > > >
> > > > > > "Ramu" <[email protected]> wrote in message
> > > > > > news:[email protected]...
> > > > > > > Hi all,
> > > > > > >
> > > > > > > Sorry for asking a dumb question..
> > > > > > >
> > > > > > > What is the scope of instance variables in a servlet? Is the
> scope
> > > is
> > > > > > > limited to thread?
> > > > > > >
> > > > > > > In other words, in the following example, i am setting
> "testStr",
> > in
> > > one
> > > > > > > request and when i tried to access the same instance variable
> from
> > > > > another
> > > > > > > request, i am getting it as null. Does it mean instance
variable
> > is
> > > > > > limited
> > > > > > > to that particular thread/request?
> > > > > > >
> > > > > > > thanks in advance..
> > > > > > >
> > > > > > > -ramu
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > >
> > >
> > >
> > >
> >
> >
>
>
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