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java

  • Android Correct Usage Onesignal

    When using onesignal as notification system in Android application, we should insert following codes in ApplicationManifest.xml file: <meta-data android:name="com.onesignal.NotificationOpened.DEFAULT" android:value="DISABLE" /> After adding this meta-data, Android will disable launcher activity to be opened. Handle notification opened event as follows: public class App extends Application { protected boolean active = true; protected int splashTime = 3000; @Override public void onCreate() { s...Continue Reading

    How to Upload Files In Android

    You can use following codes to upload files with extra parameters in Android app: public String uploadFile(String uri, String fileName) throws Exception { String lineEnd = "\r\n"; String twoHyphens = "--"; String boundary = "*****"; int bytesRead, bytesAvailable, bufferSize; byte[] buffer; int maxBufferSize = 1 * 1024 * 1024; FileInputStream fileInputStream = context.openFileInput(fileName); URL url = new URL(uri); // Open a HTTP connection to the URL HttpURLConnection conn = (HttpURLConnection) url.openC...Continue Reading

    MappedBy in bi-directional @ManyToMany : what is the reason

    Question: 1. What is the reason for setting MappedBy in bidirectional many-to-many relationships? 2. When one table has significant amount of records, while other has a few, which side is better to put mappedBy Answer: It's actually a good question, and it helps to understand the concept of an "owning" entity. If you want to prevent both sides (in a bidirectional relationship) from having join tables, a good idea, then you need to have a mappedBy= element on one side. Whether or not there is a join table is controlled by the mappedBy="name" el...Continue Reading

    Spring Security Concurrent Session Implementation With Custom Form Login Filter

    In Spring 4, we can use following configuration to adjust concurrent session count: To use concurrent session support, you’ll need to add the following to web.xml: <listener> <listener-class> org.springframework.security.web.session.HttpSessionEventPublisher </listener-class> </listener> In addition, you will need to add the ConcurrentSessionFilter to your FilterChainProxy. The ConcurrentSessionFilter requires two properties, sessionRegistry, which generally points to an instance of SessionRegistryImpl, and expiredUrl, wh...Continue Reading

    Abstract classes and Spring MVC @ModelAttribute/@RequestParam

    You need to provide your own Binding methods and then create the correct subtypes. Spring wouldn't know otherwise which of the subtypes should be instantiated for which element. Example: Url address can be like this: /proje-basvuru/ilk-uzun-metrajli-film or /proje-basvuru/kisa-film @ModelAttribute("project") public Project getProject(final HttpServletRequest request){ return createProject(getProjeBasvuruUrl(request.getRequestURI())); } private Project createProject(String projectType) { if (projectType.equals("ilk-uzun-metrajli-film")) r...Continue Reading

    JUnit 4 Testing with DBUnit in Spring Hibernate Application

    HsqlDb Connection 1. Download hsqldb.zip file from here 2. Extract zip file 3. Open bin folder in the hsqldb folder 4. Edit runServer.bat file as follows: cd ..\data @java -classpath ../lib/hsqldb.jar org.hsqldb.server.Server -database.0 mem:sample -dbname.0 sample 5. Save and run runServer.bat file 6. After running this file you should see the command prompt as follows: Spring applicationContext-test.xml File <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context"...Continue Reading

    AspectJ Load Time Weaving in Spring

    Aspect-Oriented Programming (AOP) complements Object-Oriented Programming (OOP) by providing another way of thinking about program structure. The key unit of modularity in OOP is the class, whereas in AOP the unit of modularity is the aspect. Aspects enable the modularization of concerns such as transaction management that cut across multiple types and objects. (Such concerns are often termed crosscutting concerns in AOP literature.) Lets start how to configure load time weaving in Spring framework. applicationContext.xml Configuration <bean id=...Continue Reading

    How to Access Current Sampler and Regex Variable in JMeter BeanShell Post Proccessor?

    Apache JMeter get current sampler as follows: String currentURL = ctx.getCurrentSampler().getUrl().getHost();//accessing current URL name = vars.get("takipKodu");//regex variable named as takipKodu // Pass true if you want to append to existing file // If you want to overwrite, then don't pass the second argument f = new FileOutputStream(currentURL+".txt", true); p = new PrintStream(f); this.interpreter.setOut(p); print(name); f.close();...Continue Reading

    Spring Security in JUnit Test

    @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = {"classpath:/applicationContext.xml", "classpath:/mvc-dispatcher-servlet.xml", "classpath:/spring-security.xml"}) @WebAppConfiguration public class UserControllerTest { @Autowired private UserService userService; @Autowired WebApplicationContext wac; private MockMvc mockMvc; @Before public void setup() { MockitoAnnotations.initMocks(this); this.mockMvc = MockMvcBuilders.webAppContextSetup(wac).apply(springSecurity()).bui...Continue Reading