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  • FindBugs - how to solve EQ_COMPARETO_USE_OBJECT_EQUALS

    - by Trick
    I am clueless here... 1: private static class ForeignKeyConstraint implements Comparable<ForeignKeyConstraint> { 2: String tableName; 3: String fkFieldName; 4: 5: public int compareTo(ForeignKeyConstraint o) { 6: if (this.tableName.compareTo(o.tableName) == 0) { 7: return this.fkFieldName.compareTo(o.fkFieldName); 8: } 9: return this.tableName.compareTo(o.tableName); 10: } 11: } In line 6 I get from FindBugs: Bug: net.blabla.SqlFixer$ForeignKeyConstraint defines compareTo(SqlFixer$ForeignKeyConstraint) and uses Object.equals() Link to definition I don't know how to correct this :S

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  • Question About Example In Robert C Martin's _Clean Code_

    - by Jonah
    This is a question about the concept of a function doing only one thing. It won't make sense without some relevant passages for context, so I'll quote them here. They appear on pgs 37-38: To say this differently, we want to be able to read the program as though it were a set of TO paragraphs, each of which is describing the current level of abstraction and referencing subsequent TO paragraphs at the next level down. To include the setups and teardowns, we include setups, then we include the test page content, and then we include the teardowns. To include the setups, we include the suite setup if this is a suite, then we include the regular setup. It turns out to be very dif?cult for programmers to learn to follow this rule and write functions that stay at a single level of abstraction. But learning this trick is also very important. It is the key to keeping functions short and making sure they do “one thing.” Making the code read like a top-down set of TO paragraphs is an effective technique for keeping the abstraction level consistent. He then gives the following example of poor code: public Money calculatePay(Employee e) throws InvalidEmployeeType { switch (e.type) { case COMMISSIONED: return calculateCommissionedPay(e); case HOURLY: return calculateHourlyPay(e); case SALARIED: return calculateSalariedPay(e); default: throw new InvalidEmployeeType(e.type); } } and explains the problems with it as follows: There are several problems with this function. First, it’s large, and when new employee types are added, it will grow. Second, it very clearly does more than one thing. Third, it violates the Single Responsibility Principle7 (SRP) because there is more than one reason for it to change. Fourth, it violates the Open Closed Principle8 (OCP) because it must change whenever new types are added. Now my questions. To begin, it's clear to me how it violates the OCP, and it's clear to me that this alone makes it poor design. However, I am trying to understand each principle, and it's not clear to me how SRP applies. Specifically, the only reason I can imagine for this method to change is the addition of new employee types. There is only one "axis of change." If details of the calculation needed to change, this would only affect the submethods like "calculateHourlyPay()" Also, while in one sense it is obviously doing 3 things, those three things are all at the same level of abstraction, and can all be put into a TO paragraph no different from the example one: TO calculate pay for an employee, we calculate commissioned pay if the employee is commissioned, hourly pay if he is hourly, etc. So aside from its violation of the OCP, this code seems to conform to Martin's other requirements of clean code, even though he's arguing it does not. Can someone please explain what I am missing? Thanks.

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  • Sha or Md5 algorithm i need to encrypt and decrypt in flex

    - by praveen
    Hi I am developing my application in flex and JSP, so when I am passing values through HTTP Service Post method with request object but these values are tracing and modifying by testing team so I am planning to encrypt values in flex and decrypt it in jsp.so is there any algorithms like SHA or MD5 more secure algorithms, so please send any code or related links it is very useful to me. I am using like httpService = new HTTPService; httpService.request = new Object; httpService.request.task = "doInvite"; httpService.request.email = emailInput.text; httpService.request.firstName = firstNameInput.text; httpService.request.lastName = lastNameInput.text; httpService.send(); So is there any other way to give more secure ,please help me in this,Thanks in Advance.

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  • After making a call programatically, my android app crashes

    - by Casidiablo
    Hello! The title explains all... I have this snippet of code in my application: String url = createTelUrl("3112007315"); Intent intent = new Intent(Intent.ACTION_CALL); intent.setData(Uri.parse(url)); context.startActivity(intent); It does make a call, but once the call ends, my application crashes. I'd like to return to my application once the call has finished, but I read this post and it seems not to be possible. So... is there anyway to at least pause my application and resume it once the call has finished? Thank you so much for reading.

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  • how to handle exceptions in ejb 3 based soap webservice

    - by Alexandre GUIDET
    Hi, I am currently developing an EJB3 based SOAP webservice and I wonder what are the best practices to handles uncatched exceptions and return a well formated SOAP response to the client. example: @WebMethod public SomeResponse processSomeService( @WebParam(name = "someParameters") SomeParameters someParameters) { // the EJB do something with the parameters // and retrieve a response fot the client SomeResponse theResponse = this.doSomething(someParameters); return theResponse; } Do I have to catch generic exception like: @WebMethod public SomeResponse processSomeService( @WebParam(name = "someParameters") SomeParameters someParameters) { // the EJB do something with the parameters // and retrieve a response to return to the client try { SomeResponse theResponse = this.doSomething(someParameters); } catch (Exception ex) { // log the exception logger.log(Level.SEVERE, "something is going wrong {0}", ex.getMessage()); // get a generic error response not to let the // technical reason going to the client SomeResponse theResponse = SomeResponse.createError(); } return theResponse; } Is there some kind of "best practice" in order to achieve this ? Thank you

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  • Regarding String manipulation

    - by arav
    I have a String str which can have list of values like below. I want the first letter in the string to be uppercase and if underscore appears in the string then i need to remove it and need to make the letter after it as upper case. The rest all letter i want it to be lower case. "" "abc" "abc_def" "Abc_def_Ghi12_abd" "abc__de" "_" Output: "" "Abc" "AbcDef" "AbcDefGhi12Abd" "AbcDe" ""

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  • Client side caching in GWT

    - by Silfverstrom
    We have a gwt-client, which recieves quite a lot of data from our servers. Logically, i want to cache the data on the client side, sparing the server from unnecessary requests. As of today i have let it up to my models to handle the caching of data, which doesn't scale very well. It's also become a problem since different developers in our team develop their own "caching" functionality, which floods the project with duplications. I'm thinking about how one could implement a "single point of entry", that handles all the caching, leaving the models clueless about how the caching is handled. Does anyone have any experience with client side caching in GWT? Is there a standard approach that can be implemented?

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  • JButton keyboard shortcuts

    - by Kyle
    Hello, I have two JButtons and I would like to allow them to be used by the Arrow keys whenever the JFrame is in focus, Can anyone point me in the right direction about this? Thanks ~ Kyle

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  • How to stop Spring MVC blocking all other Servlets?

    - by Dag
    Hi, I'm using Spring 2.5 MVC and wan't to add another third-party Servlet. The Problem is, that Spring MVC catches all request, so the Servlet isn't getting any request. Here a web.xml Snippet: SpringMVC org.springframework.web.servlet.DispatcherServlet 2 <servlet-mapping> <servlet-name>SpringMVC</servlet-name> <url-pattern>/*</url-pattern> </servlet-mapping> <servlet> This is the servlet needed for cache.type servlet, returns the packed resources PackServlet PackServlet net.sf.packtag.servlet.PackServlet PackServlet *.pack The /* mapping is really needed for the application, an pack:tag (the third-party Servlet) really need the mapping based on the file extension. Any possiblities to tell Spring not to process the request? Thanks and regards.

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  • JAXB adding namespace to parent but not to the child elements contained

    - by Nishant
    I put together an XSD and used JAXB to generate classes out of it. Here are my XSDs- myDoc.xsd : <?xml version="1.0" encoding="UTF-8"?> <xs:schema xmlns="http://www.mydoc.org" targetNamespace="http://www.mydoc.org" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:mtp="http://www.mytypes.com" elementFormDefault="qualified"> <xs:import namespace="http://www.mytypes.com" schemaLocation="mytypes.xsd" /> <xs:element name="myDoc"> <xs:complexType> <xs:sequence> <xs:element name="crap" type="xs:string"/> <xs:element ref="mtp:foo"/> <xs:element ref="mtp:bar"/> </xs:sequence> </xs:complexType> </xs:element> mytypes.xsd <?xml version="1.0" encoding="UTF-8"?> <xs:schema targetNamespace="http://www.mytypes.com" xmlns="http://www.mytypes.com" xmlns:tns="http://www.mytypes.com" xmlns:xs="http://www.w3.org/2001/XMLSchema" attributeFormDefault="qualified" elementFormDefault="qualified"> <xs:element name="foo" type="tns:Foo"/> <xs:element name="bar" type="tns:Bar"/> <xs:element name="spam" type="tns:Spam"/> <xs:simpleType name="Foo"> <xs:restriction base="xs:string"></xs:restriction> </xs:simpleType> <xs:complexType name="Bar"> <xs:sequence> <xs:element ref="spam"/> </xs:sequence> </xs:complexType> <xs:simpleType name="Spam"> <xs:restriction base="xs:string" /> </xs:simpleType> </xs:schema> The document marshalled is- <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <myDoc xmlns:ns2="http://www.mytypes.com"> <crap>real crap</crap> <ns2:foo>bleh</ns2:foo> <ns2:bar> <spam>blah</spam> </ns2:bar> </myDoc> Note that the <spam> element uses the default namespace. I would like it to use the ns2 namespace. The schema (mytypes.xsd) expresses the fact that <spam> is contained within <bar> which in the XML instance is bound to the ns2 namespace. I've broken my head over this for over a week and I would like ns2 prefix to appear in <spam>. What should I do? Required : <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <myDoc xmlns:ns2="http://www.mytypes.com"> <crap>real crap</crap> <ns2:foo>bleh</ns2:foo> <ns2:bar> <ns2:spam>blah</ns2:spam><!--NS NS NS--> </ns2:bar> </myDoc>

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  • Duplicate a collection of entities and persist in Hibernate/JPA

    - by Michael Bavin
    Hi, I want to duplicate a collection of entities in my database. I retreive the collection with: CategoryHistory chNew = new CategoryHistory(); CategoryHistory chLast = (CategoryHistory)em.createQuery("SELECT ch from CategoryHistory ch WHERE ch.date = MAX(date)").getSingleResult; List<Category> categories = chLast.getCategories(); chNew.addCategories(categories)// Should be a copy of the categories: OneToMany Now i want to duplicate a list of 'categories' and persist it with EntityManager. I'm using JPA/Hibernate. UPDATE After knowing how to detach my entities, i need to know what to detach: current code: CategoryHistory chLast = (CategoryHistory)em.createQuery("SELECT ch from CategoryHistory ch WHERE ch.date=(SELECT MAX(date) from CategoryHistory)").getSingleResult(); Set<Category> categories =chLast.getCategories(); //detach org.hibernate.Session session = ((org.hibernate.ejb.EntityManagerImpl) em.getDelegate()).getSession(); session.evict(chLast);//detaches also its child-entities? //set the realations chNew.setCategories(categories); for (Category category : categories) { category.setCategoryHistory(chNew); } //set now create date chNew.setDate(Calendar.getInstance().getTime()); //persist em.persist(chNew); This throws a failed to lazily initialize a collection of role: entities.CategoryHistory.categories, no session or session was closed exception. I think he wants to lazy load the categories again, as i have them detached. What should i do now?

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  • Logback to log different messages to two files

    - by Aly
    I am using logback/slf4j to do my logging. I want to parse my log file to analyze some data, so instead of parsing a great big file (mostly consisting of debug statements) I want to have two logger instances which each log to a separate file; one for analytics and one for all purpose logging. Does anyone know if this is possible with Logback, or any other logger for that matter?

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  • Struts 1 - struts-taglib.jar is not being found by the web application

    - by Yatendra Goel
    I am using Struts-1. I have developed a struts-based web application. I am using struts tags in my JSP pages supplied in struts-taglib.jar by inserting the following lines in the JSP file: <%@ taglib prefix="html" uri="http://struts.apache.org/tags-html" %> <%@ taglib prefix="logic" uri="http://struts.apache.org/tags-logic" %> <%@ taglib prefix="bean" uri="http://struts.apache.org/tags-bean" %> Now the application is working fine when I run it on my localsystem but when I deploy it on a server, it shows the following exception: org.apache.jasper.JasperException: The absolute uri: http://struts.apache.org/tags-html cannot be resolved in either web.xml or the jar files deployed with this application From the above exception, it seems that the application hasn't found the struts-taglib.jar file. But I have put the struts-taglib.jar in /WEB-INF/lib directory. Then where is the problem?

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  • Weird RecordStore behavior when RecordStoreFullException occurs

    - by Michael P
    Hello everyone! I'm developing a small J2ME application that displays bus stops timetables - they are stored as records in MIDP RecordStores. Sometimes records can not fit a single RecordStore, especially on record update - using setRecord method - a RecordStoreFullException occurs. I catch the exception, and try to write the record to a new RecordStore along with deleting the previous one in the old RecordStore. Everything works fine except of deleting record from RecordStore where the RecordStoreFullException occurs. If I make an attempt to delete record that could not be updated, another Exception of type InvalidRecordIDException is thrown. This is weird and undocumented in MIDP javadoc. I have tested it on Sun WTK 2.5.2, MicroEdition SDK 3.0 and Nokia Series 40 SDK. Furthermore I created a code that reproduces this strange behaviour: RecordStore rms = null; int id = 0; try { rms = RecordStore.openRecordStore("Test", true); byte[] raw = new byte[192*10024]; //Big enough to cause RecordStoreFullException id = rms.addRecord(raw, 0, 160); rms.setRecord(id, raw, 0, raw.length); } catch (Exception e) { try { int count = rms.getNumRecords(); RecordEnumeration en = rms.enumerateRecords(null, null, true); count = en.numRecords(); while(en.hasNextElement()){ System.out.println("NextID: "+en.nextRecordId()); } rms.deleteRecord(id); //this won't work! rms.setRecord(id, new byte[5], 0, 5); //this won't work too! } catch (Exception ex) { ex.printStackTrace(); } } I added extra enumeration code to produce other weird behavior - when RecordStoreFullException occurs, count variable will be set to 1 (if RMS was empty) by both methods - getNumRecords and numRecords. System.out.println will produce NextID: 0! It is not acceptable because record ID can not be 0! Could someone explain this strange behavior? Sorry for my bad English.

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  • Unresolved Host Exception Android

    - by Rob Stevenson-Leggett
    I'm trying to call a RESTful web service from an Android application using the following method: HttpHost target = new HttpHost("http://" + ServiceWrapper.SERVER_HOST,ServiceWrapper.SERVER_PORT); HttpGet get = new HttpGet("/list"); String result=null; HttpEntity entity = null; HttpClient client = new DefaultHttpClient(); try { HttpResponse response=client.execute(target, get); entity = response.getEntity(); result = EntityUtils.toString(entity); } catch (Exception e) { e.printStackTrace(); } finally { if (entity!=null) try { entity.consumeContent(); } catch (IOException e) {} } return result; I can browse to address and see the xml results using the Android Emulator browser and from my machine. I have given my app the INTERNET permission. I'm developing with eclipse. I've seen it mentioned that I might need to configure a proxy but since the web service i'm calling is on port 80 this shouldn't matter should it? I can call the method with the browser. Any ideas?

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  • codingBat plusOut using regex

    - by polygenelubricants
    This is similar to my previous efforts (wordEnds and repeatEnd): as a mental exercise, I want to solve this toy problem using regex only. Description from codingbat.com: Given a string and a non-empty word string, return a version of the original string where all chars have been replaced by pluses ("+"), except for appearances of the word string which are preserved unchanged. plusOut("12xy34", "xy") ? "++xy++" plusOut("12xy34", "1") ? "1+++++" plusOut("12xy34xyabcxy", "xy") ? "++xy++xy+++xy" There is no mention whether or not to allow overlap (e.g. what is plusOut("+xAxAx+", "xAx")?), but my non-regex solution doesn't handle overlap and it passes, so I guess we can assume non-overlapping occurrences of word if it makes it simpler. In any case, I'd like to solve this using regex (of the same style that I did before with the other two problems), but I'm absolutely stumped. I don't even have anything to show, because I have nothing that works. So let's see what the stackoverflow community comes up with.

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  • How do I use Google protobuf to communicate over a serial port?

    - by rob
    I'm working on a project that uses RXTX and protobuf to communicate with an application on a development board and I've been running into issues which implies that I'm likely doing things the wrong way. Here's what I currently have for writing the request to the board (the read code is similar): public void write(CableCommandRequest request, OutputStream out) { CodedOutputStream outStream = CodedOutputStream.newInstance(out); request.writeTo(outStreatm); outStream.flush(); } The OutputStream that is used is prepared by RXTX and the development board seems to indicate that data is being received, but it is getting garbled or is otherwise not being understood. There seems to be little documentation on using protobuf over a serial connection so I'm assuming that passing the OutputStream should be sufficient. Is this in fact correct, or is this the wrong way of sending the response over the serial connection?

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  • Sharing transactions between web applications, which run in the same cluster

    - by pihentagy
    We (will) have the following architecture: Base.war will be a self-contained spring-hibernate application All applications will run under Glassfish, and may be clustered E1.war will sit on top of Base.war, extending it's functionality There could be further extensions (E2.war, E3.war, …) sitting on top of Base.war Either wars could start a transaction, and transactions could span between wars Without shutting down Base.war, or any other Ex.war, it should be possible to upgrade an Ey.war Is there a solution for this with spring-hibernate-glassfish environment?

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  • Log response-time in restlet-based webservice

    - by amarillion
    What is the simplest way to log the response-time for a restlet-based webservice? I want to make sure that our webservice has a reasonable response time. So I want to be able to keep an eye on response times, and do something about the requests that take too long. The closest thing I could find is this recipe: http://www.naviquan.com/blog/restlet-cookbook-log, it explains how to change the log format. But there doesn't seem to be a parameter for response times, so probably a completely different approach is needed.

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  • Interface between two related JPA entities

    - by OpenSource
    The scenario is as below (tables shown) Delivery table ------ id channelId type 10 100 fax 20 200 email Fax table ---- id number 100 1234567 101 1234598 Email table ----- id email 200 [email protected] 201 [email protected] basically a one to one relationship between the delivery and the channel entity but since each concrete channel(fax, email) has different members I want to create a generic interface (channel) between the two entities and use it for the @OneToOne relationship. Seems to me a simple scenario where lot of you might have already gone through but I'm unable to succeed. I tried putting that targetEntity thing but no use. Still says "delivery references an unknown entity" Any ideas? thanks in advance

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