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• Problem Using POI To Set CellStyleProperty With HSSFCellUtil

  - by Alvin Sim

  I have a Java class which uses Apache POI to generate reports in Excel. When I run the Java class from my IDE or command prompt, I only see warning messages from LOG4J as below: log4j:WARN No appenders could be found for logger (org.apache.commons.beanutils.converters.BooleanConverter). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. Despite the warning messages, the report was generated successfully. But when I run it from my web app, which uses JSP and submits the form to a Servlet which calls the Java class, the Java class seems to have problems setting the style properties to the cell. Below are the Java code and also the stack trace. I'm testing this on a Standalone OC4J and the IDE which I'm using is Oracle's JDeveloper. And the Java JDK is 1.4.2. I've been looking high and low the whole day yesterday but can't seem to find out why. Code: region = new Region(1, (short) 1, 5, (short)2); sheet.addMergedRegion(region); HSSFRegionUtil.setBorderBottom( (short) 1, region, sheet, workBook ); Stack trace: 10/06/07 16:03:17 SvltRptProcessor ACTION=print_to_file RPT_CLASSNAME=com.reports.BP.DailySalesBudgetExcelRpt DES_TYPE=file DES_FORMAT=xls 10/06/07 16:03:17 rptFilename=/oracle/reports//20100607_160317_BP_DailySalesBudgetByPmgrp_OPR.xls 10/06/07 16:03:17 ReportRunner printToFile execute -> com.reports.BP.DailySalesBudgetExcelRpt 10/06/07 16:03:17 enter daily sales budget excel rpt -----> print() 10/06/07 16:03:18 Tutalii: C:\oc4j10gmy\j2ee\home\applib\poi-2.5.1.jar archive 10/06/07 16:03:19 org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor 10/06/07 16:03:19 at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:509) 10/06/07 16:03:19 at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:285) 10/06/07 16:03:19 at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:255) 10/06/07 16:03:19 at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:381) 10/06/07 16:03:19 at org.apache.commons.beanutils.ConvertUtilsBean.<init>(ConvertUtilsBean.java:157) 10/06/07 16:03:19 at org.apache.commons.beanutils.BeanUtilsBean.<init>(BeanUtilsBean.java:117) 10/06/07 16:03:19 at org.apache.commons.beanutils.BeanUtilsBean$1.initialValue(BeanUtilsBean.java:68) 10/06/07 16:03:19 at org.apache.commons.beanutils.ContextClassLoaderLocal.get(ContextClassLoaderLocal.java:153) 10/06/07 16:03:19 at org.apache.commons.beanutils.BeanUtilsBean.getInstance(BeanUtilsBean.java:80) 10/06/07 16:03:19 at org.apache.commons.beanutils.PropertyUtilsBean.getInstance(PropertyUtilsBean.java:114) 10/06/07 16:03:19 at org.apache.commons.beanutils.PropertyUtils.describe(PropertyUtils.java:209) 10/06/07 16:03:19 at org.apache.poi.hssf.usermodel.contrib.HSSFCellUtil.setCellStyleProperty(HSSFCellUtil.java:174) 10/06/07 16:03:19 at org.apache.poi.hssf.usermodel.contrib.HSSFRegionUtil. setBorderBottom(HSSFRegionUtil.java:153) 10/06/07 16:03:19 at com.reports.BP.DailySalesBudgetExcelRpt.setRegion(DailySalesBudgetExcelRpt.java:773) 10/06/07 16:03:19 at com.reports.BP.DailySalesBudgetExcelRpt.createHdr(DailySalesBudgetExcelRpt.java:308) 10/06/07 16:03:19 at com.reports.BP.DailySalesBudgetExcelRpt.start(DailySalesBudgetExcelRpt.java:272) 10/06/07 16:03:19 at com.reports.BP.DailySalesBudgetExcelRpt.print(DailySalesBudgetExcelRpt.java:222) 10/06/07 16:03:19 at com.servlet.RPT.ReportRunner.printToFile(ReportRunner.java:601) 10/06/07 16:03:19 at com.servlet.RPT.ReportRunner.doPrint(ReportRunner.java:302) 10/06/07 16:03:19 at com.servlet.RPT.ReportRunner.run(ReportRunner.java:270) 10/06/07 16:03:19 at java.lang.Thread.run(Thread.java:619) 10/06/07 16:03:19 Caused by: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor 10/06/07 16:03:19 at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:420) 10/06/07 16:03:19 at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:502) 10/06/07 16:03:19 ... 20 more 10/06/07 16:03:19 Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/Category 10/06/07 16:03:19 at java.lang.Class.getDeclaredConstructors0(Native Method) 10/06/07 16:03:19 at java.lang.Class.privateGetDeclaredConstructors(Class. java:2389) 10/06/07 16:03:19 at java.lang.Class.getConstructor0(Class.java:2699) 10/06/07 16:03:19 at java.lang.Class.getConstructor(Class.java:1657) 10/06/07 16:03:19 at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:417) 10/06/07 16:03:19 ... 21 more 10/06/07 16:03:19 Caused by: java.lang.ClassNotFoundException: org.apache.log4j. Category 10/06/07 16:03:19 at java.net.URLClassLoader$1.run(URLClassLoader.java:202 ) 10/06/07 16:03:19 at java.security.AccessController.doPrivileged(Native Method) 10/06/07 16:03:19 at java.net.URLClassLoader.findClass(URLClassLoader.java :190) 10/06/07 16:03:19 at java.lang.ClassLoader.loadClass(ClassLoader.java:307) 10/06/07 16:03:19 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) 10/06/07 16:03:19 at java.lang.ClassLoader.loadClass(ClassLoader.java:248) 10/06/07 16:03:19 ... 26 more org.apache.commons.lang.exception.NestableException: Couldn't setCellStyleProperty. at org.apache.poi.hssf.usermodel.contrib.HSSFCellUtil.setCellStyleProperty(HSSFCellUtil.java:209) at org.apache.poi.hssf.usermodel.contrib.HSSFRegionUtil.setBorderBottom(HSSFRegionUtil.java:153) at com.reports.BP.DailySalesBudgetExcelRpt.setRegion(DailySalesBudgetExcelRpt.java:773) at com.reports.BP.DailySalesBudgetExcelRpt.createHdr(DailySalesBudgetExcelRpt.java:308) at com.reports.BP.DailySalesBudgetExcelRpt.start(DailySalesBudgetExcelRpt.java:272) at com.reports.BP.DailySalesBudgetExcelRpt.print(DailySalesBudgetExcelRpt.java:222) at com.servlet.RPT.ReportRunner.printToFile(ReportRunner.java:601) at com.servlet.RPT.ReportRunner.doPrint(ReportRunner.java:302) at com.servlet.RPT.ReportRunner.run(ReportRunner.java:270) at java.lang.Thread.run(Thread.java:619) Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:509) at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:285) at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:255) at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:381) at org.apache.commons.beanutils.ConvertUtilsBean.<init>(ConvertUtilsBean.java:157) at org.apache.commons.beanutils.BeanUtilsBean.<init>(BeanUtilsBean.java:117) at org.apache.commons.beanutils.BeanUtilsBean$1.initialValue(BeanUtilsBean.java:68) at org.apache.commons.beanutils.ContextClassLoaderLocal.get(ContextClassLoaderLocal.java:153) at org.apache.commons.beanutils.BeanUtilsBean.getInstance(BeanUtilsBean.java:80) at org.apache.commons.beanutils.PropertyUtilsBean.getInstance(PropertyUtilsBean.java:114) at org.apache.commons.beanutils.PropertyUtils.describe(PropertyUtils.java:209) at org.apache.poi.hssf.usermodel.contrib.HSSFCellUtil.setCellStyleProperty(HSSFCellUtil.java:174) ... 9 more Caused by: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:420) at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactory Impl.java:502) ... 20 more Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/Category at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389) at java.lang.Class.getConstructor0(Class.java:2699) at java.lang.Class.getConstructor(Class.java:1657) at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:417) ... 21 more Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Category at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) ... 26 more

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• Excel COM - Unable to get the Open property of the Workbooks class?

  - by Abs

  Hello all, I have tried this and I get this error: $excel_app = new COM("Excel.Application") or Die ("Did not connect"); $Workbook = $excel_app->Workbooks->Open('Variables.xls') or Die('Did not open filename'); I get this error: Unable to get the Open property of the Workbooks class What does this error mean? In addition, is there an API or a function list for accessing excel via COM. Thanks all Update Full error: exception 'com_exception' with message 'Source: Microsoft Excel Description: Unable to get the Open property of the Workbooks class' in C:\excel.php:22 Stack trace: #0 C:\excel.php(22): variant->Open('C:\...') #1 {main}

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• How to populate a drop down list in Spring MVC

  - by GigaPr

  Hi, would like to populate a drop down list on a jsp page i have my page that looks like <form:form method="POST" action="addRss.htm" commandName="addNewRss" cssClass="addUserForm"> <div class="floatL"> <div class="padding5"> <div class="fieldContainer"> <strong>Title:</strong>&nbsp; </div> <form:errors path="title" cssClass="error"/> <form:input path="title" cssClass="textArea" /> </div> <div class="padding5"> <div class="fieldContainer"> <strong>Description:</strong>&nbsp; </div> <form:errors path="description" cssClass="error"/> <form:input path="description" cssClass="textArea" /> </div> <div class="padding5"> <div class="fieldContainer"> <strong>Language:</strong>&nbsp; </div> <form:errors path="language" cssClass="error"/> <form:select path="language" cssClass="textArea" /> </div> </div> <div class="floatR"> <div class="padding5"> <div class="fieldContainer"> <strong>Link:</strong>&nbsp; </div> <form:errors path="link" cssClass="error"/> <form:input path="link" cssClass="textArea" /> </div> <div class="padding5"> <div class="fieldContainer"> <strong>Url:</strong>&nbsp; </div> <form:errors path="url" cssClass="error"/> <form:input path="url" cssClass="textArea" /> </div> <div class="padding5"> <div class="fieldContainer"> <strong>Url</strong>&nbsp; </div> <form:errors path="url" cssClass="error"/> <form:input path="url" cssClass="textArea" /> </div> </div> <input type="submit" class="floatR" value="Add New Rss"> </form:form> and my controller public class AddRssController extends BaseController { private static final String[] LANGUAGES = { "AL", "AK", "AZ", "AR", "CA", "CO", "CT", "DE", "DC", "FL", "GA", "HI", "ID", "IL", "IN", "IA", "KS", "KY", "LA", "ME", "MD", "MA", "MI", "MN", "MS", "MO", "MT", "NE", "NV", "NH", "NJ", "NM", "NY", "NC", "ND", "OH", "OK", "OR", "PA", "RI", "SC", "SD", "TN", "TX", "UT", "VA", "VT", "WA", "WV", "WI", "WY" }; public AddRssController() { setCommandClass(RSS.class); setCommandName("addNewRss"); } @Override protected Object formBackingObject(HttpServletRequest request) throws Exception { RSS rantForm = (RSS) super.formBackingObject(request); // rantForm.setVehicle(new Vehicle()); return rantForm; } @Override protected Map referenceData(HttpServletRequest request) throws Exception { Map referenceData = new HashMap(); referenceData.put("language", LANGUAGES); return referenceData; } @Override protected ModelAndView onSubmit(Object command, BindException bindException) throws Exception { RSS rss = (RSS) command; rssServiceImplementation.add(rss); return new ModelAndView(getSuccessView()); } } and my BaseController public class BaseController extends SimpleFormController implements Controller { public UserServiceImplementation userServiceImplementation; public UserServiceImplementation getUserServiceImplementation() { return userServiceImplementation; } public void setUserServiceImplementation(UserServiceImplementation userServiceImplementation) { this.userServiceImplementation = userServiceImplementation; } public RssServiceImplementation rssServiceImplementation; public RssServiceImplementation getRssServiceImplementation() { return rssServiceImplementation; } public void setRssServiceImplementation(RssServiceImplementation rssServiceImplementation) { this.rssServiceImplementation = rssServiceImplementation; } } But it doesn t work Any suggestion?

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• Cannot convert the value in attribute '[attr]' to object of type 'System.Windows.TemplateBindingExte

  - by Krimson

  Hi, I get this error when I define my attached dependency properties in a class outside the class hierarchy and set the owner to a common parent class. Attached dependency property in WindowBase class (outside class hierarchy = generated error): public static readonly DependencyProperty AreaColorProperty = DependencyProperty.RegisterAttached("AreaColor", typeof(AreaColor), typeof(Window)); TemplateBinding that fails {TemplateBinding local:WindowBase.AreaColor} If I instead define the attached dependency property in a class within the class heirarchy and set the owner to this class, then I don't get any errors, why is this? Attached dependency property in WindowBase (within class hierarchy = no errors): public static readonly DependencyProperty AreaColorProperty = DependencyProperty.RegisterAttached("AreaColor", typeof(AreaColor), typeof(WindowBase)); Best Regards, Jesper

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• ASP.NET Cache Class - Are there differences between ASP.NET 3.5 and ASP.NET 4.0?

  - by hamlin11

  Are there any major differences between the ASP.NET Cache Class from ASP.NET 3.5 to 4.0?

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• Overloading *(iterator + n) and *(n + iterator) in a C++ iterator class?

  - by exscape

  (Note: I'm writing this project for learning only; comments about it being redundant are... uh, redundant. ;) I'm trying to implement a random access iterator, but I've found very little literature on the subject, so I'm going by trial and error combined with Wikpedias list of operator overload prototypes. It's worked well enough so far, but I've hit a snag. Code such as exscape::string::iterator i = string_instance.begin(); std::cout << *i << std::endl; works, and prints the first character of the string. However, *(i + 1) doesn't work, and neither does *(1 + i). My full implementation would obviously be a bit too much, but here's the gist of it: namespace exscape { class string { friend class iterator; ... public: class iterator : public std::iterator<std::random_access_iterator_tag, char> { ... char &operator*(void) { return *p; // After some bounds checking } char *operator->(void) { return p; } char &operator[](const int offset) { return *(p + offset); // After some bounds checking } iterator &operator+=(const int offset) { p += offset; return *this; } const iterator operator+(const int offset) { iterator out (*this); out += offset; return out; } }; }; } int main() { exscape::string s = "ABCDEF"; exscape::string::iterator i = s.begin(); std::cout << *(i + 2) << std::endl; } The above fails with (line 632 is, of course, the *(i + 2) line): string.cpp: In function ‘int main()’: string.cpp:632: error: no match for ‘operator*’ in ‘*exscape::string::iterator::operator+(int)(2)’ string.cpp:105: note: candidates are: char& exscape::string::iterator::operator*() *(2 + i) fails with: string.cpp: In function ‘int main()’: string.cpp:632: error: no match for ‘operator+’ in ‘2 + i’ string.cpp:434: note: candidates are: exscape::string exscape::operator+(const char*, const exscape::string&) My guess is that I need to do some more overloading, but I'm not sure what operator I'm missing.

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• mtl, transformers, monads-fd, monadLib, and the paradox of choice

  - by yairchu

  Hackage has several packages for monad transformers: mtl: Monad transformer library transformers: Concrete functor and monad transformers monads-fd: Monad classes, using functional dependencies monads-tf: Monad classes, using type families monadLib: A collection of monad transformers. mtl-tf: Monad transformer library using type families mmtl: Modular Monad transformer library mtlx: Monad transformer library with type indexes, providing 'free' copies. compose-trans: Composable monad transformers (and maybe I missed some) Which one shall we use? mtl is the one in the Haskell Platform, but I keep hearing on reddit that it's uncool. But what's bad about choice anyway, isn't it just a good thing? Well, I saw how for example the authors of data-accessor had to make all these to cater to just the popular choices: data-accessor-monadLib library: Accessor functions for monadLib's monads data-accessor-monads-fd library: Use Accessor to access state in monads-fd State monad class data-accessor-monads-tf library: Use Accessor to access state in monads-tf State monad type family data-accessor-mtl library: Use Accessor to access state in mtl State monad class data-accessor-transformers library: Use Accessor to access state in transformers State monad I imagine that if this goes on and for example several competing Arrow packages evolve, we might see something like: spoonklink-arrows-transformers, spoonklink-arrows-monadLib, spoonklink-tfArrows-transformers, spoonklink-tfArrows-monadLib, ... And then I worry that if spoonklink gets forked, Hackage will run out of disk space. :) Questions: Why are there so many monad transformer packages? Why is mtl [considered] uncool? What are the key differences? Most of these seemingly competing packages were written by Andy Gill and are maintained by Ross Paterson. Does this mean that these packages are not competing but rather work together in some way? And do Andy and Ross consider any of their own packages as obsolete? Which one should me and you use?

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• Why isnt the copy constructor of member class called?

  - by sandeep

  class member { public: member() { cout<<"Calling member constr"<<'\n'; } member(const member&) { cout<<"Calling member copy constr"<<'\n'; } }; class fred { public: fred() { cout<<"calling fred constr"<<'\n'; } fred(const fred &) { cout<<"Calling fred copy constr"<<'\n'; } protected: member member_; }; int main() { fred a; fred b=a; } Output: Calling member constr calling fred constr **Calling member constr** Calling fred copy constr

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• Casting a object to a base class , return the extented object??

  - by CrazyJoe

  My Code: public class Contact { public string id{ get; set; } public string contact_type_id { get; set; } public string value{ get; set; } public string person_id { get; set; } public Contact() { } } public class Contact:Base.Contact { public ContactType ContactType { get; set; } public Person Person {get; set;} public Contact() { ContactType = new ContactType(); Person = new Person(); } } And: Contact c = new Contact(); Base.Contact cb = (Base.Contact)c; The Problem: The **cb** is set to **Contac** and not to **Base.Contact**. Have any trick to do that????

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• Fields of class, are they stored in the stack or heap?

  - by Mirek

  I saw a question yesterday which raised (for me) another question. Please look at the following code: public class Class1 { int A; //as I uderstand, int is value type and therefore lives in the stack } class Class2 { Run() { Class1 instance1 = new Class1(); instance1.A = 10; //it points to value type, but isnt this reference (on heap)? } } Or while creating the instance of Class1, its field types are created on the heap as well? But then I do not understand when it would really be on the stack as almost always you need to create an instance of object in order to use it fields.

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• Java: "Could not find the main class. Program will exit"

  - by AJ

  I'm trying to run SQuirreL SQL. I've downloaded it and installed it, but when I try to run it I get this error message: Java Virtual Machine Launcher. Could not find the main class. Program will exit. I get the gist of this, but I have not idea how to fix it. Any help? more info: I'm on Windows XP pro. I have java 1.6 installed, and other apps are running OK. The install ran OK. I believe I've followed the installation instructions correctly. To run it, I'm invoking the squirrel-sql.bat file. Update This question: http://stackoverflow.com/questions/1417328/could-not-find-the-main-class gives some background on this error from the point of view of a java developer.

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• How do I create an instance of this class in Android?

  - by Lloyd Banks

  I was wondering if it is possible to create an instance of this class (from the link, which creates a listview) from another class so that I can call on either lazyadapter.java or customizedlistview.java (not sure which one) to inflate that same listview. Is this possible? This is what I tried (obviously incorrect): CustomizedListView clv = new CustomizedListView(); clv.onCreate(...); source: http://www.androidhive.info/2012/02/android-custom-listview-with-image-and-text/ LazyAdapter.java import java.util.ArrayList; import java.util.HashMap; import android.app.Activity; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; public class LazyAdapter extends BaseAdapter { private Activity activity; private ArrayList&lt;HashMap&lt;String, String&gt;&gt; data; private static LayoutInflater inflater=null; public ImageLoader imageLoader; public LazyAdapter(Activity a, ArrayList&lt;HashMap&lt;String, String&gt;&gt; d) { activity = a; data=d; inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); imageLoader=new ImageLoader(activity.getApplicationContext()); } public int getCount() { return data.size(); } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { View vi=convertView; if(convertView==null) vi = inflater.inflate(R.layout.list_row, null); TextView title = (TextView)vi.findViewById(R.id.title); // title TextView artist = (TextView)vi.findViewById(R.id.artist); // artist name TextView duration = (TextView)vi.findViewById(R.id.duration); // duration ImageView thumb_image=(ImageView)vi.findViewById(R.id.list_image); // thumb image HashMap&lt;String, String&gt; song = new HashMap&lt;String, String&gt;(); song = data.get(position); // Setting all values in listview title.setText(song.get(CustomizedListView.KEY_TITLE)); artist.setText(song.get(CustomizedListView.KEY_ARTIST)); duration.setText(song.get(CustomizedListView.KEY_DURATION)); imageLoader.DisplayImage(song.get(CustomizedListView.KEY_THUMB_URL), thumb_image); return vi; } } CustomizedListView.java import java.util.ArrayList; import java.util.HashMap; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListView; public class CustomizedListView extends Activity { // All static variables static final String URL = "http://api.androidhive.info/music/music.xml"; // XML node keys static final String KEY_SONG = "song"; // parent node static final String KEY_ID = "id"; static final String KEY_TITLE = "title"; static final String KEY_ARTIST = "artist"; static final String KEY_DURATION = "duration"; static final String KEY_THUMB_URL = "thumb_url"; ListView list; LazyAdapter adapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ArrayList&lt;HashMap&lt;String, String&gt;&gt; songsList = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); XMLParser parser = new XMLParser(); String xml = parser.getXmlFromUrl(URL); // getting XML from URL Document doc = parser.getDomElement(xml); // getting DOM element NodeList nl = doc.getElementsByTagName(KEY_SONG); // looping through all song nodes &lt;song&gt; for (int i = 0; i &lt; nl.getLength(); i++) { // creating new HashMap HashMap&lt;String, String&gt; map = new HashMap&lt;String, String&gt;(); Element e = (Element) nl.item(i); // adding each child node to HashMap key =&gt; value map.put(KEY_ID, parser.getValue(e, KEY_ID)); map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE)); map.put(KEY_ARTIST, parser.getValue(e, KEY_ARTIST)); map.put(KEY_DURATION, parser.getValue(e, KEY_DURATION)); map.put(KEY_THUMB_URL, parser.getValue(e, KEY_THUMB_URL)); // adding HashList to ArrayList songsList.add(map); } list=(ListView)findViewById(R.id.list); // Getting adapter by passing xml data ArrayList adapter=new LazyAdapter(this, songsList); list.setAdapter(adapter); // Click event for single list row list.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) { } }); } }

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• How do I enumerate a list of interfaces that are directly defined on an inheriting class/interface?

  - by Jordan

  Given the following C# class: public class Foo : IEnumerable<int> { // implementation of Foo and all its inherited interfaces } I want a method like the following that doesn't fail on the assertions: public void SomeMethod() { // This doesn't work Type[] interfaces = typeof(Foo).GetInterfaces(); Debug.Assert(interfaces != null); Debug.Assert(interfaces.Length == 1); Debug.Assert(interfaces[0] == typeof(IEnumerable<int>)); } Can someone help by fixing this method so the assertions don't fail? Calling typeof(Foo).GetInterfaces() doesn't work because it returns the entire interface hierarchy (i.e. interfaces variable contains IEnumerable<int> and IEnumerable), not just the top level.

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• Java, filling arrays, and inheritance

  - by Arvanem

  Hi folks, I think I'm running into an inheritance conceptual wall with my Java arrays. I'm kind of new to Java so please tell me if I have things upside down. In essence, I want to do three things: Create a runnersArray with the attributes of my Runners class. Fill my runnersArray using my GenerateObjects method of my GenerateObjects class. Access the contents of my filled runnersArray in my Evaluating method of my Evaluating class. The problem seems to be that runnersArray is not visible to the methods in steps 2 and 3 above, but their classes (due to design reasons) cannot inherit or extend Runners class. Thanks in advance for any suggestions. Here are some code snippets showing what I'm trying to do: public class Runners extends Party { Runners[] runnersArray = new Runners[5]; } and public class GenerateObject extends /* certain parent class */ { public GenerateObject (int arrayNum) { runnersArray[arrayNum] = /* certain Runners attributes */; } } and public class Evaluating extends /*certain parent class*/ { public Evaluating (int arrayNum) { System.out.println(/* String cast attribute of runnersArray[arrayNum]*/; } }

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• How to add event listners / signals to a simple superman class?

  - by Kabumbus

  I can and would love to use boost or std for this. Sorry - I am new to C++. So I created a really simple program like: #include <iostream> #include <string> using namespace std; class superman { public: string punch(){return cout << "superman: I hit the bad guy!" << endl;}; }; int main() { superman clark; clark.punch(); cin.get(); } I want to add an event listner that would tell me when clark punched and cout something like "superman punched!". How to add such event listner and event function to my class?

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• Java: how does isDirectory and isFile work in File-class?

  - by HH

  $ javac GetAllDirs.java GetAllDirs.java:16: cannot find symbol symbol : variable checkFile location: class GetAllDirs System.out.println(checkFile.getName()); ^ 1 error $ cat GetAllDirs.java import java.util.*; import java.io.*; public class GetAllDirs { public void getAllDirs(File file) { if(file.isDirectory()){ System.out.println(file.getName()); File checkFile = new File(file.getCanonicalPath()); }else if(file.isFile()){ System.out.println(file.getName()); File checkFile = new File(file.getParent()); }else{ // checkFile should get Initialized at least HERE! File checkFile = file; } System.out.println(file.getName()); // WHY ERROR HERE: checkfile not found System.out.println(checkFile.getName()); } public static void main(String[] args) { GetAllDirs dirs = new GetAllDirs(); File current = new File("."); dirs.getAllDirs(current); } }

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• How do i cast A to object to class A when B can typcast to A?

  - by acidzombie24

  Basically i want to do this. ee causes a bad cast exception. NOTE: o can be ANYTHING. It may not be B, it can be C, D, E, F etc. But this should work as long as o is a class that can typecast into A (B is such a class. It uses an implicit operator overload) var b = (B)"sz"; var e = (A)b; object o = b; var ee = (A)o;

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• Regular Expressions: RegEx for determining valid PHP class property names?

  - by Brian Lacy

  I am using PHP's magic __set and __get methods to access a private array in a class. I want to make sure the property names requested (i.e. $myObj->FakeProperty) are valid according to PHP property name rules before accessing them. My current RegEx isn't doing the trick; with my test values, _12 always falls through the cracks. I'm not actually sure that my test values even represent a realistic representation of what is and isn't allowed for PHP class property names, but I'm not really too concerned about it, just that I have some sort of rudimentary check in place. Test Fields: albert12 12Albert _12 _Albert12 _12Albert _____a_1 RegEx: ^(?=_*[A-z]+)[A-z0-9_]+$

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• How do I handle all the exceptions in a C# class where both ctor and finalizer throw exceptions?

  - by Frank

  How can I handle all exceptions for a class similar to the following under certain circumstances? class Test : IDisposable { public Test() { throw new Exception("Exception in ctor"); } public void Dispose() { throw new Exception("Exception in Dispose()"); } ~Test() { this.Dispose(); } } I tried this but it doesn't work: static void Main() { Test t = null; try { t = new Test(); } catch (Exception ex) { Console.Error.WriteLine(ex.Message); } // t is still null } I have also tried to use "using" but it does not handle the exception thrown from ~Test(); static void Main() { try { using (Test t = new Test()) { } } catch (Exception ex) { Console.Error.WriteLine(ex.Message); } } Any ideas how can I work around?

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• Intellij Idea 13.x and ASM 5.x library incompatible?

  - by Jarrod Roberson

  I can't get Intellij Idea 13.0 to compile my code against ASM 5.0.3 I have a multi-module Maven project. It compiles and installs successfully. Apparently com.google.findbugs:findbugs has a dependency on asm:asm:3.3 and I want to use org.ow2.asm:asm:5.0.3 to manipulate some bytecode. So in the parent pom.xml I exclude the asm:asm:3.3 dependencies from the classpath. This works fine when I run mvn install from the command line. I can't get the Build - Make Project menu selection to work in Intellij Idea. Here is the relevant parts of my pom.xml files. parent.pom <dependency> <groupId>org.ow2.asm</groupId> <artifactId>asm</artifactId> <version>5.0.3</version> </dependency> <dependency> <groupId>org.ow2.asm</groupId> <artifactId>asm-tree</artifactId> <version>5.0.3</version> </dependency> <dependency> <groupId>org.ow2.asm</groupId> <artifactId>asm-util</artifactId> <version>5.0.3</version> </dependency> <dependency> <groupId>org.ow2.asm</groupId> <artifactId>asm-commons</artifactId> <version>5.0.3</version> </dependency> <dependency> <groupId>com.google.code.findbugs</groupId> <artifactId>findbugs</artifactId> <version>2.0.3</version> <exclusions> <exclusion> <groupId>asm</groupId> <artifactId>asm</artifactId> </exclusion> <exclusion> <groupId>asm</groupId> <artifactId>asm-commons</artifactId> </exclusion> <exclusion> <groupId>asm</groupId> <artifactId>asm-tree</artifactId> </exclusion> </exclusions> </dependency> Here is the code that is failing 18 public static void main(final String[] args) throws IOException 19 { 20 final InputStream is = NotEmptyTest.class.getResourceAsStream("/com/vertigrated/annotation/NotEmptyTest.class"); 21 final ClassReader cr = new ClassReader(is); 22 final ClassNode cn = new ClassNode(); 23 cr.accept(cn, 0); 24 for (final MethodNode mn : cn.methods) 25 { 26 - 38 snipped for brevity 39 } 40 } 41 } Here is the error message: Information:Using javac 1.7.0_25 to compile java sources Information:java: Errors occurred while compiling module 'tests' Information:Compilation completed with 1 error and 2 warnings in 2 sec Information:1 error Information:2 warnings /<path to my source code>/NotEmptyTest.java Error:Error:line (24)java: incompatible types required: org.objectweb.asm.tree.MethodNode found: java.lang.Object Warning:Warning:java: /<path to my project>//NotEmptyTest.java uses unchecked or unsafe operations. Warning:Warning:java: Recompile with -Xlint:unchecked for details. As you can see in the screen capture, it reports the correct version of the libraries in the Javadoc but the AutoComplete shows the old 3.3 non-typesafe return value of List instead of List<MethodNode>: Here is what Maven knows, which is correct: [INFO] --- maven-dependency-plugin:2.8:list (default-cli) @ tests --- [INFO] [INFO] The following files have been resolved: [INFO] com.google.code.findbugs:bcel:jar:2.0.1:compile [INFO] junit:junit:jar:4.11:test [INFO] xml-apis:xml-apis:jar:1.0.b2:compile [INFO] com.apple:AppleJavaExtensions:jar:1.4:compile [INFO] javax.inject:javax.inject:jar:1:compile [INFO] jaxen:jaxen:jar:1.1.6:compile [INFO] org.ow2.asm:asm-util:jar:5.0.3:compile [INFO] com.google.inject:guice:jar:3.0:compile [INFO] dom4j:dom4j:jar:1.6.1:compile [INFO] com.google.code.findbugs:jFormatString:jar:2.0.1:compile [INFO] net.jcip:jcip-annotations:jar:1.0:compile [INFO] org.ow2.asm:asm-tree:jar:5.0.3:compile [INFO] commons-lang:commons-lang:jar:2.6:compile [INFO] com.google.code.findbugs:jsr305:jar:2.0.1:compile [INFO] org.hamcrest:hamcrest-core:jar:1.3:test [INFO] aopalliance:aopalliance:jar:1.0:compile [INFO] com.google.code.findbugs:findbugs:jar:2.0.3:compile [INFO] org.ow2.asm:asm-commons:jar:5.0.3:compile [INFO] org.ow2.asm:asm:jar:5.0.3:compile How do I get Intellij Idea to use the correct dependency internally?

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• Python3 and ftplib uploading files

  - by Teifion

  My python2 script uploads files nicely using this method but python3 is presenting problems and I'm stuck as to where to go next (googling hasn't helped). from ftplib import FTP ftp = FTP(ftp_host, ftp_user, ftp_pass) ftp.storbinary('STOR myfile.txt', open('myfile.txt')) The error I get is Traceback (most recent call last): File "/Library/WebServer/CGI-Executables/rob3/functions/cli_f.py", line 12, in upload ftp.storlines('STOR myfile.txt', open('myfile.txt')) File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 454, in storbinary conn.sendall(buf) TypeError: must be bytes or buffer, not str I tried altering the code to from ftplib import FTP ftp = FTP(ftp_host, ftp_user, ftp_pass) ftp.storbinary('STOR myfile.txt'.encode('utf-8'), open('myfile.txt')) But instead I got this Traceback (most recent call last): File "/Library/WebServer/CGI-Executables/rob3/functions/cli_f.py", line 12, in upload ftp.storbinary('STOR myfile.txt'.encode('utf-8'), open('myfile.txt')) File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 450, in storbinary conn = self.transfercmd(cmd) File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 358, in transfercmd return self.ntransfercmd(cmd, rest)[0] File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 329, in ntransfercmd resp = self.sendcmd(cmd) File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 244, in sendcmd self.putcmd(cmd) File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 179, in putcmd self.putline(line) File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 172, in putline line = line + CRLF TypeError: can't concat bytes to str Can anybody point me in the right direction

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• Trying to 'Make' CUDA SDK, ld cannot find library, ldconfig says it can.

  - by Andrew Bolster

  I know there are many other questions similar to this one, but none of the solutions posited there are working for me Basically, making the SDK sample files, i get /usr/bin/ld: cannot find -lcuda which would be an easy enough 'find the library and throw it to ldconfig', except ldconfig already says it has it... $ sudo ldconfig -v | grep cuda /usr/local/cuda/lib64: libcudartemu.so.3 -> libcudartemu.so.3.0.14 libcudart.so.3 -> libcudart.so.3.0.14 /usr/local/cuda/lib: libcudartemu.so.3 -> libcudartemu.so.3.0.14 libcudart.so.3 -> libcudart.so.3.0.14 libcuda.so.1 -> libcuda.so.195.36.15 libcuda.so.1 -> libcuda.so.195.36.15 libicudata.so.42 -> libicudata.so.42.1 And I checked, there is a symlink libcuda.so -> libcuda.so.1 but I'm still confused as to why libcuda.so -> ... doesnt show up I must be missing something really obvious. Any ideas?

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• How to resolve Android class issues: android.Manifest$permission and android.R?

  - by Maxood

  I have updated software and ADT in my Eclipse a number of times. I am unable to run projects above than 1.5.I have the following errors showing up in my console window after i create a HelloWorld project with API Level 4 (1.6): [2010-04-04 22:21:53 - Framework Resource Parser] Collect resource IDs failed, class android.R not found in E:\Android\android-sdk_r04-windows\android-sdk-windows\platforms\android-1.6\android.jar [2010-04-04 22:21:53 - Framework Resource Parser] Collect permissions failed, class android.Manifest$permission not found in E:\Android\android-sdk_r04-windows\android-sdk-windows\platforms\android-1.6\android.jar [2010-04-04 22:21:54 - Android Framework Parser] failed to collect preference classes How to resolve this issue?

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• How to override a class method of the gem in rails Application ?

  - by Srinivas Iyer

  Hi, Best practice to Override a class method of the gem in rails Application . I need to override the behaviour of the find method of a gem. following is the code in the gem module Youtube class display attr_accessor :base def find(id, options = {}) detailed = convert_to_number(options.delete(:detailed)) options[:detailed] = detailed unless detailed.nil? base.send :get, "/get_youtube", options.merge(:youtube_id => id) end end end How do i override the above find method in my YoutubeSearch Controller of Rails Application ? def find(id, options = {}) //Code here end Thanks

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• How to reliably replace a library-defined error handler with my own?

  - by sharptooth

  On certain error cases ATL invokes AtlThrow() which is implemented as ATL::AtlThrowImpl() which in turn throws CAtlException. The latter is not very good - CAtlException is not even derived from std::exception and also we use our own exceptions hierarchy and now we will have to catch CAtlException separately here and there which is lots of extra code and error-prone. Looks like it is possible to replace ATL::AtlThrowImpl() with my own handler - define _ATL_CUSTOM_THROW and define AtlThrow() to be the custom handler before including atlbase.h - and ATL will call the custom handler. Not so easy. Some of ATL code is not in sources - it comes compiled as a library - either static or dynamic. We use the static - atls.lib. And... it is compiled in such way that it has ATL::ThrowImpl() inside and some code calling it. I used a static analysis tool - it clearly shows that there're paths on which the old default handler is called. To ensure I even tried to "reimplement" ATL::AtlThrowImpl() in my code. Now the linker says it sees two declarations of ATL::AtlThrowImpl() which I suppose confirms that there's another implementation that can be called by some code. How can I handle this? How do I replace the default handler completely and ensure that the default handler is never called?

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