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• OGNL thread safety

  - by Dewfy

  I'm going to reuse OGNL library out of Struts2 scope. I have rather large set of formulas, that is why I would like to precompile all of them: Ognl.parseExpression(expressionString); But I'm not sure if precompiled expression can be used in multi-thread environment. Does anybody knows if it can be used?

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• What happens if an exception is thrown in finalize()

  - by Psykocyber

  What would happen if an exception is thrown during the execution of finalize()? Is the stack unwind like normally? Does it continue finalize() and ignore the exception? Does it stop finalize() and continue GC the object? Or something else? I'm not looking for guidelines of using finalize() there are plently of pages explaining that.

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• Prevent duplicate entries in arraylist

  - by timyh

  Say I create some object class like so public class thing { private String name; private Integer num; public oDetails (String a, Integer b) { name = a; num = b; } ...gets/ sets/ etc Now I want to create an arraylist to hold a number of this object class like so. ArrayList<thing> myList = new ArrayList<thing>; thing first = new thing("Star Wars", 3); thing second = new thing("Star Wars", 1); myList.add(first); myList.add(second); I would like to include some sort of logic so that in this case...when we try and add object "second" rather than add a new object to the arrayList, we add second.getNum() to first.getNum(). So if you were to iterate through the ArrayList it would be "Star Wars", 4 I am having trouble coming up with an elegant way of handling this. And as the arraylist grows, searching through it to determine if there are duplicate name items becomes cumbersome. Can anyone provide some guidance on this?

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• Direct flow depending on incoming dynamic type

  - by Improfane

  I have a listener class that accepts GUI change events in one method. The incoming event objects have a superclass of a type of GUI Event, the behaviour should depend on the dynamic type of the incoming variable. I wanted to do do lots of methods like: handleGUIEvent(EventChangedX event) handleGUIEvent(EventChangedY event) I am using a single event listener and receiving objects of various types but the behaviour should be different for each. What would you do? I do not want to use a switch statement as this would get unmaintainable.

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• Does <T> need to be imported as a class for this to work?

  - by zxc

  In order for this to work, do you have to have an import statement for the T class? private static <T> void invertOrdering(List<T> list) { for (int i = 0; i < list.size() / 2; i++) { int j = list.size() - 1 - i; T item1 = list.get(i); T item2 = list.get(j); list.set(i, item2); list.set(j, item1); } }

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• How do I find if string has at least one character using regex?

  - by Vishal

  Examples: "1 name": Should say it has characters "10,000": OK "na123me": Should say it has characters "na 123, 000": Should say it has characters

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• Tomcat does not persist UserPrinciple during restart

  - by mabuzer

  How to force Tomcat to serialize UserPrinciple so that the user is kept logged in when Tomcat has restarted? Right now the user has to login again everytime. Added the following lines into web-app context.xml: <Manager className="org.apache.catalina.session.PersistentManager"> <Store className="org.apache.catalina.session.FileStore"/> </Manager> but still I see login page after Tomcat restart, I use Tomcat 6.0.26

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• Is there programming language with better approach for switch's break statements ?

  - by Vitaly Polonetsky

  It's the same syntax in a way too many languages: switch (someValue) { case OPTION_ONE: case OPTION_LIKE_ONE: case OPTION_ONE_SIMILAR: doSomeStuff1(); break; // EXIT the switch case OPTION_TWO_WITH_PRE_ACTION: doPreActionStuff2(); // the default is to CONTINUE to next case case OPTION_TWO: doSomeStuff2(); break; // EXIT the switch case OPTION_THREE: doSomeStuff3(); break; // EXIT the switch } Now all you know that break statements are required, because the switch will continue to the next case when break statement is missing. We have an example of that with OPTION_LIKE_ONE, OPTION_ONE_SIMILAR and OPTION_TWO_WITH_PRE_ACTION. The problem is that we only need this "skip to next case" very very very rarely. And very often we put break at the end of case. It very easy for a beginner to forget about it. And one of my C teachers even explained it to us as if it was a bug in C language (don't want to talk about it :) I would like to ask if there are any other languages that I don't know of (or forgot about) that handle switch/case like this: switch (someValue) { case OPTION_ONE: continue; // CONTINUE to next case case OPTION_LIKE_ONE: continue; // CONTINUE to next case case OPTION_ONE_SIMILAR: doSomeStuff1(); // the default is to EXIT the switch case OPTION_TWO_WITH_PRE_ACTION: doPreActionStuff2(); continue; // CONTINUE to next case case OPTION_TWO: doSomeStuff2(); // the default is to EXIT the switch case OPTION_THREE: doSomeStuff3(); // the default is to EXIT the switch } The second question: is there any historical meaning to why it is like this in C? May be continue to next case was used far more often than we use it these days ?

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• Selenium Webdrivers: Load Page without any resources

  - by Biffy

  I am trying to prevent Javascript from changing the site's source code I'm testing with Selenium. The problem is, I can't just simply turn Javascript off in the Webdriver, because I need it for a test. Here's what I'm doing for the Firefox Webdriver: firefoxProfile.setPreference("permissions.default.image", 2); firefoxProfile.setPreference("permissions.default.script", 2); firefoxProfile.setPreference("permissions.default.stylesheet", 2); firefoxProfile.setPreference("permissions.default.subdocument", 2); I don't allow Firefox to load any Images, Scripts and Stylesheets. How can I do this with the Internet Explorer Webdriver and the Chrome Webdriver? I have not found any similar preferences. Or is there even a more elegant way to stop the webdrivers from loading the site's JS Files after all? Thank you!

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• Mutable objects and hashCode

  - by robert

  Have the following class: public class Member { private int x; private long y; private double d; public Member(int x, long y, double d) { this.x = x; this.y = y; this.d = d; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + x; result = (int) (prime * result + y); result = (int) (prime * result + Double.doubleToLongBits(d)); return result; } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj instanceof Member) { Member other = (Member) obj; return other.x == x && other.y == y && Double.compare(d, other.d) == 0; } return false; } public static void main(String[] args) { Set<Member> test = new HashSet<Member>(); Member b = new Member(1, 2, 3); test.add(b); System.out.println(b.hashCode()); b.x = 0; System.out.println(b.hashCode()); Member first = test.iterator().next(); System.out.println(test.contains(first)); System.out.println(b.equals(first)); System.out.println(test.add(first)); } } It produces the following results: 30814 29853 false true true Because the hashCode depends of the state of the object it can no longer by retrieved properly, so the check for containment fails. The HashSet in no longer working properly. A solution would be to make Member immutable, but is that the only solution? Should all classes added to HashSets be immutable? Is there any other way to handle the situation? Regards.

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• Performing regex on a stream

  - by takoi

  I have some large text files which im going to preform consecutive matching on (just capturing, not replacing). Im thinking its not such a good idea to keep the whole file in memory, but rather use a Reader. What i know about the input is that if there's a match, its not going to span more than 5 lines. So my idea was to have some sort of buffer which just keeps these 5 lines, or so, do the first search, and continue. But it has to "know" where the regex match ended for this to work. e.g if the match ends at line 2 it should start the next search from here. Is it possible to do something like this in an efficient way?

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• Can php listen for a mysql database change or update? ...thinking real-time, live search here

  - by Derrick

  Im trying to think of the best way to handle real time search for a website. The only solution I can come up with is to keep checking the server every few seconds for something new in the database, but that does not seem very practical to me.

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• Calculating end date while skipping holidays + Joda time

  - by picca

  I would like to calculate end date (and time) of an event. I know starting date and duration (in minutes). But: I have to skip holidays - non-recurrent situation I have to skip weekends - recurrent situation I have to not count working time (e.g: from 8:00am till 5:00pm) - recurrent situation, but with finer granularity Is there a simple way to achieve these cases using Joda time library?

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• Changing JTextArea to JScrollPane Causes it to not be visible

  - by user1806716

  I am having an issue with JScrollPanes and JTextArea objects and getting them to work together. If I just add a JTextArea to my JPanel, it works fine and shows up where I tell it to. However, if I change the contentPane.add(textArea) to contentPane.add(new JScrollPane(textArea)), the textArea is not longer visible and there is no sign of the textarea either. Here is my code: public docToolGUI() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 611, 487); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); textField = new JTextField(); textField.setBounds(253, 323, 86, 20); contentPane.add(textField); textField.setColumns(10); JLabel lblEnterRootDirectory = new JLabel("Enter Root Directory"); lblEnterRootDirectory.setBounds(253, 293, 127, 20); contentPane.add(lblEnterRootDirectory); JButton btnGo = new JButton("Go"); btnGo.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent arg0) { new ToolWorker().execute(); } }); btnGo.setBounds(253, 361, 89, 23); contentPane.add(btnGo); textArea = new JTextArea(); textArea.setWrapStyleWord(true); textArea.setEditable(false); textArea.setBounds(25, 11, 560, 276); contentPane.add(new JScrollPane(textArea)); }

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• Junit Ant Task, output stack trace

  - by Benju

  I have a number of tests failing in the following JUnit Task. <target name="test-main" depends="build.modules" description="Main Integration/Unit tests"> <junit fork="yes" description="Main Integration/Unit Tests" showoutput="true" printsummary="true" outputtoformatters="true"> <classpath refid="test-main.runtime.classpath"/> <batchtest filtertrace="false" todir="${basedir}"> <fileset dir="${basedir}" includes="**/*Test.class" excludes="**/*MapSimulationTest.class"/> </batchtest> </junit> </target> How do I tell Junit to ouput the errors for each test so that I can look at the stack trace and debug the issues.

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• Maven2 junit timeout annotation doesn't work

  - by roesslerj

  We have a bunch of tests in a maven2 project and build with cruisecontrol. However the build regularly hangs, because the annotation of the test with a timeout @Test(timeout = 5000) is ignored. I tried and run maven locally, reproducing the fact, that the timeout is ignored. Is there a way to activate the timeout for the tests again? I currently use a work arround in setting a timeout in cruisecontrol. However this simply means that the whole build is chancelled, and not just the tests that should fail. Remark: It seems in maven 1 there was a property to activate the junit timeout which is missing in maven 2.

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• Can I refer to an object in its constructor?

  - by Roman

  Can I do the following? public Manager(String userName) { game = new Game(userName); game.addManager(this); } The problem is that I refer to an object (this) in its constructor (before it was actually created).

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• Set request attributes when a Form is POSTed

  - by ssahmed555

  Is there any way to set request attributes (not parameters) when a form is posted? The problem I am trying to solve is: I have a JSP page displaying some data in a couple of dropdown lists. When the form is posted, my Controller servlet processes this request (based on the parameters set/specified in the form) and redirects to the same JSP page that is supposed to display addition details. I now want to display the same/earlier data in the dropdown lists without having to recompute or recalculate to get that same data. And in the said JSP page, the dropdown lists in the form are populated by data that is specified through request attributes. Right now, after the Form is POSTed and I am redirected to the same JSP page the dropdown lists are empty because the necessary request attributes are not present. I am quite the n00b when it comes to web apps, so an obvious & easy solution to this problem escapes me at the moment! I am open to suggestions on how to restructure the control flow in the Servlet. Some details about this app: standard Servlet + JSP, JSTL, running in Apache Tomcat 6.0. Thanks.

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• Iterate over a list and put data in hashmap

  - by sarah

  I am having a list where i need to loop over it and put its data in hashmap,i am using this approach for(int i=0;i<list.size();i++) { HashMap hMap=new HashMap(); hMap.put("Data", list); } But when i need to read the value from hMap i am doing in this way Collection c = hMap.values(); Iterator itr = c.iterator(); while(itr.hasNext()) { System.out.println("next val is--"+itr.next()); } next vali is--- is printed in com.bean.xyz@23032bc[id=1] format ,i need the exact data,how will i do this ?

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• Get first character of each word and its position in a sentence/paragraph

  - by Radhika

  I am trying to create a map by taking the first character of each word and it's position in a sentence/paragraph. I am using regex pattern to achieve this. Regex is a costly operation. Are there are any ways to achieve this? Regex way: public static void getFirstChar(String paragraph) { Pattern pattern = Pattern.compile("(?<=\\b)[a-zA-Z]"); Map newMap = new HashMap(); Matcher fit = pattern.matcher(paragraph); while (fit.find()) { newMap.put((fit.group().toString().charAt(0)), fit.start()); } }

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• Android: How can I set a listener to the MenuButton?

  - by Mannaz

  I want do do a custom action when pressing on the Menu button on the phone. Is it possible to set an onClickListener (or similar) on the button and if how? onCreateOptionsMenu is only called the first time the button is pressed - I already tried this.

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• Can I have two names for the same variable?

  - by Roman

  The short version of the question: I do: x = y. Then I change x, and y is unchanged. What I want is to "bind" x and y in such a way that I change y whenever I change x. The extended version (with some details): I wrote a class ("first" class) which generates objects of another class ("second" class). In more details, every object of the second class has a name as a unique identifier. I call a static method of the first class with a name of the object from the second class. The first class checks if such an object was already generated (if it is present in the static HashMap of the first class). If it is already there, it is returned. If it is not yet there, it is created, added to the HashMap and returned. And then I have the following problem. At some stage of my program, I take an object with a specific name from the HashMap of the first class. I do something with this object (for example change values of some fields). But the object in the HashMap does not see these changes! So, in fact, I do not "take" an object from the HashMap, I "create a copy" of this object and this is what I would like to avoid.

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• I have a feeling that adding fields marked with @Transient annotation to entity is very bug-prone. A

  - by Roman

  I have some philosophical feeling that adding to an entity fields which doesn't mapped to the DB is a wrong way of solving problems. But are there any concrete situations where using @Transient fields leads to implicit and hard fixing problems? For example, is it possible that adding/removing 2nd level cache will break our app when there are @Transient fields in our entities?

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• Are @ManagedBean's obsolete in JavaEE6 - because of CDI/Weld?

  - by yournamehere

  Because of CDI (and its implementation Weld), every POJO in JEE6 can be annotated with @Named, which makes the POJO accessible to the view. Does that mean that ManagedBeans are completely obsolete now? Or do i miss something where @ManagedBean still makes sense?

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• Getting class Type information for Elements on a collection

  - by DutrowLLC

  I would like to get gain access to the type of Object held in a Collection. Below is a simplified example of when and why I might want to do this. Is this even possible? List<Address> addressList = new LinkedList<Address>(); Main.addElement(addressList); Class Main{ public void addElement(Object inArgument){ List<Object> argument = (List<Object>)inArgument; argument.add( /* WOULD LIKE TO CREATE A NEW OBJECT OF THE APPROPRIATE TYPE HERE, IN THIS CASE, IT WOULD BE OF TYPE: "Address" */ ); } }

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