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• Regular Expression, JEditorPane, Self-closing tags

  - by Stephen Swensen

  I'm am using JEditorPane to render basic HTML. But it renders self-closing tags incorrectly, specifically br tags, e.g. <br /> is bad but <br> is good. I would like to use String.replaceAll(regex, "<br>") to fix the HTML, where regex is a regular expression matching any self-closing br tag with case-insensitivity and zero to infinity number of spaces between the "r" and the "/" (e.g., <br/>, <BR/>, <br />, <Br     />, etc.). Thanks to any regular expression experts who can solve this!

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• what are the difference between InnoDB and MyISAM.

  - by harigm

  what are the difference between InnoDB and MyISAM. Which one I can go for? any areas where one provides and other doesnot provide? IS there any technological limitations in any of the both types? Please help me to choose the right type for my project?

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• Does the Android API support KML files?

  - by Benju

  Is there a way in Android to load KML files from Google Earth into a map widget?

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• JSON URL from StackExchange API returning jibberish?

  - by shsteimer

  I have a feeling I'm doing something wrong here, but I'm not quite sure I'f I'm missing a step, or am just having an encoding problem or something. Here's my code URL url = new URL("http://api.stackoverflow.com/0.8/questions/2886661"); BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream())); // Question q = new Gson().fromJson(in, Question.class); String line; StringBuffer content = new StringBuffer(); while ((line = in.readLine()) != null) { content.append(line); } when I print content, I get a whole bunch of wingdings and special characters, basically jibberish. I would copy and past it here, but that isn't working. What am I doing wrong?

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• Why aren't APT generated classes being compiled by Eclipse?

  - by yamsha

  In my Eclipse project I'm using a third-party annotation processor, Hibernate Metamodel Generator to be exact. The annotation processor works as expected and generates files as specified by the spec. These files are generated inside the directory of the Eclipse project under a "gen" folder. In the project properties this is correctly reflected since two source folders exist - "src" and "gen." However, when the project is built for some reason all the [generated] sources under "gen" are not compiled (checking the "bin" directory I only see .class file from the "src" directory). Does anyone know why this is happening?

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• Is commons-exec thread-safe?

  - by dwlnetnl

  Is Apache a commons-exec thread-safe library?

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• Best way to fetch data from a single database table with multiple threads?

  - by Ravi Bhatt

  Hi, we have a system where we collect data every second on user activity on multiple web sites. we dump that data into a database X (say MS SQL Server). we now need to fetch data from this single table from daatbase X and insert into database Y (say mySql). we want to fetch time based data from database X through multiple threads so that we fetch as fast as we can. Once fetched and stored in database Y, we will delete data from database X. Are there any best practices on this sort of design? any specific things to take care on table design like sharing or something? Are there any other things that we need to take care to make sure we fetch it as fast as we can from threads running on multiple machines? Thanks in advance! Ravi

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• Sun permgen & JRockit garbage collection

  - by Striker

  In the Sun JVM, classes that are loaded by the class loader are put in permgen space and never gc'd. (Unless the class loader goes out of scope) It's my understanding that JRockit puts that same data on the heap instead. Is that data then subject to garbage collection? Thanks.

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• DAO, Spring and Hibernate

  - by EugeneP

  Correct me if anything is wrong. Now when we use Spring DAO for ORM templates, when we use @Transactional attribute, we do not have control over the transaction and/or session when the method is called externally, not within the method. Lazy loading saves resources - less queries to the db, less memory to keep all the collections fetched in the app memory. So, if lazy=false, then everything is fetched, all associated collections, that is not effectively, if there are 10,000 records in a linked set. Now, I have a method in a DAO class that is supposed to return me a User object. It has collections that represent linked tables of the database. I need to get a object by id and then query its collections. Hibernate "failed to lazily initialize a collection" exception occurs when I try to access the linked collection that this DAO method returns. Explain please, what is a workaround here?

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• ListAdapter to modify the datasource (which is an arraylist)

  - by dusker

  Hi Everyone, here's a problem that i've run into lately: I have a listview with a custom adapter class, the adapter takes in a listview and populates the listview with elements from it. Now, i'd like to have a button on each row of a listview to remove the item from it. How should i approach this problem? Is there a way to remotely trigger a method in the activity class and call notifydatachanged() method on the adapter to refresh the listview? thanks in advance for your help and some code snippets if possible best regards peter

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• Getting the OpenID URL from a Grails Controller/Service

  - by firnnauriel

  I'm using acegi 0.5.2 and enabled OpenID support. I would like to know how to accesss the URL (or username) returned by a provider (i.e. Google, Yahoo!). I can't find any docs about that so I traced the code of acegi and found this in GrailsOpenIdAuthenticationProvider: OpenIDAuthenticationToken response = (OpenIDAuthenticationToken) authentication OpenIDAuthenticationStatus status = response.status // handle the various possibilites if (status == OpenIDAuthenticationStatus.SUCCESS) { // Lookup user details UserDetails userDetails = _userDetailsService.loadUserByUsername(response.identityUrl) return new GrailsOpenIdAuthenticationToken(userDetails, response.status, response.identityUrl) } it seems that the response.identityUrl contains what i need. How can get it from a controller's (or service's) space? Thanks.

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• HttpURLConnection: Is it necessary to call connect()?

  - by stormin986

  Many examples I've seen don't explicitly call connect(). Instead they just use getInputStream() or getResponseCode(). I'm assuming all of these HttpURLConnection methods that require a connection just call connect() themselves? Are there any cases where connect() must be explicitly called for an HttpURLConnection?

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• Reconnect to GPRS from J2ME

  - by ouzz

  Dear All, I have a little problem. I have developed a midlet application that call some webservices through internet. I'm using cell phones with GPRS connection. For some time it runs as I wanted, run the apps, call the webservices through the GPRS, it returns the result, call the webservices again, and so on. But say, I call the webservices and after the apps return the result I needed, I left it for a while. The next time I continue to access the webservices, the apps takes a while to connect through the GPRS. In nokia, it is marked with a G in a box. In SE it is marked with a glowing globe. This 'G' in the box or the glowing globe will appear after a while or won't appear at all, but the apps is still trying to connect to the internet. Does it come from my apps or it come from the cell phone? And could I know [or the apps knows] that at the moment the apps tries to connect the GPRS is ready? Thanks a lot for your responses...

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• weak references and garbage collection

  - by FredOverflow

  Suppose I have a weak reference to a car which has an ordinary reference to an engine. No other references to the car or the engine exist. Can the engine be garbage collected?

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• JPA Cascading Delete: Setting child FK to NULL on a NOT NULL column

  - by JBristow

  I have two tables: t_promo_program and t_promo_program_param. They are represented by the following JPA entities: @Entity @Table(name = "t_promo_program") public class PromoProgram { @Id @Column(name = "promo_program_id") private Long id; @OneToMany(cascade = {CascadeType.REMOVE}) @JoinColumn(name = "promo_program_id") private List<PromoProgramParam> params; } @Entity @Table(name = "t_promo_program_param") public class PromoProgramParam { @Id @Column(name = "promo_program_param_id") private Long id; //@NotNull // This is a Hibernate annotation so that my test db gets created with the NOT NULL attribute, I'm not married to this annotation. @ManyToOne @JoinColumn(name = "PROMO_PROGRAM_ID", referencedColumnName = "promo_program_id") private PromoProgram promoProgram; } When I delete a PromoProgram, Hibernate hits my database with: update T_PROMO_PROGRAM_PARAM set promo_program_id=null where promo_program_id=? delete from t_promo_program where promo_program_id=? and last_change=? I'm at a loss for where to start looking for the source of the problem.

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• Portlet container like pluto or jetspeed on google app engine?

  - by Patrick Cornelissen

  I am trying to build something "portlet server"-ish on the google app engine. (as open source) I'd like to use the JSR168/286 standards, but I think that the restrictions of the app engine will make it somewhere between tricky and impossible. Has anyone tried to run jetspeed or an application that uses pluto internally on the google app engine? Based on my current knowledge of portlets and the google app engine I'm anticipating these problems: A war file with portlets is from the deployment standpoint more or less a complete webapp (yes, I know that it doesn't really work without a portal server). The war file may contain it's own web.xml etc. This makes deployment on the app engine rather difficult, because the apps are not visible to each other, so all portlet containing archives need to be included in the war file of the deployed "app engine based portal server". The "portlets" are (at least in liferay) started as permanent servlet processes, based on their portlet.xmls and web.xmls which is located in the same spot for every portlet archive that is loaded. I think this may be problematic in the app engine, because everything is in one big "web app", so it may be tricky to access the portlet.xmls from each archive. This prevents a 100% compatibility in my opinion. Is here anyone who has any experience with the combination of portlets and the app engine? Do you think it's feasible to modify jetspeed, pluto or any other portlet container to be able to run it on the app engine?

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• stringtoList issue

  - by alpdog14

  I have a stringtoList ArrayList that needs to return tokens from a StreamTokenizer but the s.sval is not compiling at run-time, can anyone help me with this problem: private List<Token> stringToList(final String string) { // TODO your job // follow Main.main but put the tokens into a suitable list ArrayList<Token> al = new ArrayList<Token>(); String word = ""; String in = string; StreamTokenizer s = new StreamTokenizer(new StringReader(in)); int token; while ((token = s.nextToken()) != StreamTokenizer.TT_EOF) { if (token == StreamTokenizer.TT_WORD) { DefaultToken t = (s.sval, s.lineno()); //problem here, not reading the sval from the StreamTokenizer!!! al.add(t); } return al; } } Any help would be most appreciated

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• how to aviod infinite loop in observer pattern?

  - by joseph

  Hello. I have only one class with many instances. Every instance is observer of couple of other instances. As well every instance can be observable by couple of another instances. How to avoid infinite loop of calling update() in observers?

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• Why can I not register a PropertyEditor for String in Spring MVC?

  - by Tom Tucker

  I'm using Spring 3.0.3. I've enabled the default ConversionService by adding this line to my Spring configuration XML. <mvc:annotation-driven/> I'm also using custom PropertyEditor's for certain data types, so I've registered them for corresponding data types like the following and they work fine. webDataBinder.registerCustomEditor(Date.class, new MyPropertyEditor()); I have a custom tag library that extends Spring's Form tag library, and I can acess these PropertyEditor's through getPropertyEditor() of AbstractDataBoundFormElementTag. What I don't understand is that I can't register a custom PropertyEditor for String for some reason. The following wouldn't work. webDataBinder.registerCustomEditor(String.class, new MyPropertyEditor()); When I do getPropertyEditor(), it always returns a ConvertingPropertyEditorAdapter, instead of MyPropertyEditor. Is this a bug? EDIT: I realized that I didn't do some stuff right. Spring works just fine.

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• how to achieve xxx.blogspot.com URL pattern ??

  - by abc

  Consider the case of blogspot.com the domain is the one blogspot.com only but suppose i register in it with xxx then i will have xxx.blogspot.com like wise here it won't be the subdomain (i can smell) , but its some thing different ... how to achieve this ?? in j2ee web application..

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• Retrieve GWT radiobutton value in server from the request

  - by Florian d'Erfurth

  Hi, I'm having a headache figuring how to retrieve the gwt Radio Buttons values in the server side. Here is my UiBinder form: <g:FormPanel ui:field="form"><g:RadioButton name="fruit">apple</g:RadioButton><g:RadioButton name="fruit">banana</g:RadioButton> ... So i though i would have to do this on the servlet: fruit = req.getParameter("fruit") But of course this doesn't work, parameter fruit doesn't exist :/ So how should i do?

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• Setting a custom XOM EntityResolver

  - by Stefan Kendall

  I need to not validate against a doctype, so I'd like to set a custom EntityResolver that accepts everything. I'm getting data back from tagsoup, so I know my data is well-formed and correct. Furthermore, I need to rapidly hit a number of documents, so when I do this with the default EntityResolver, I get 503 from w3.org. How, then, can I use a XOM builder with a custom entity resolver?

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• How to center Label vertical and horizontal in draw2d Figure ?

  - by aphex

  I have the following situation: Label label = new Label(); label.setText("bla"); RoundedRectangle fig = new RoundedRectangle(); fig.add(label); FlowLayout layout = new FlowLayout(); layout.setStretchMinorAxis(true); fig.setLayoutManager(layout); fig.setOpaque(true); That works only to center the label vertical or horizontal by using layout.setHorizontal(true/false); , but not together. Any idea how to make it work ?

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• FileFinder using SQL

  - by James Morgan

  I was thinking of working on a project while I have some free time and this one looks pretty nice: http://mindprod.com/project/filefinder.html One thing I'm wondering about is that will it really be much faster compared to the regular windows search if I use SQL? I'm planning to use MySQL since it's open source. Also, do I need to be good at databases for this? I have basic knowledge about relational databases and can definitely make some SQL statements. Thanks.

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• Exclude css & image resources in web.xml Security Constraint

  - by Tiggles

  I am using JSF2.1 and Glassfish 3.1.2. I specify a security constraint to block everything: <security-constraint> <web-resource-collection> <web-resource-name>Secured Content</web-resource-name> <!-- Block all --> <url-pattern>/*</url-pattern> </web-resource-collection> <!-- only users with at least one of these roles are allowed to access the secured content --> <auth-constraint> <role-name>ADMINISTRATOR</role-name> </auth-constraint> </security-constraint> and have another to allow access a subset of pages and the resources: <security-constraint> <web-resource-collection> <web-resource-name>Open Content</web-resource-name> <!-- Allow subscribe --> <url-pattern>/subscribe/*</url-pattern> <url-pattern>/javax.faces.resource/*</url-pattern> </web-resource-collection> <!-- No Auth Contraint! --> </security-constraint> This works fine. However, is the following <url-pattern>/javax.faces.resource/*</url-pattern> the correct way to allow all resources? I only did this by looking at the url that Facelets injects into the xhtml. Is there security holes with this approach? Thanks.

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