java,spring,jpa , Transaction error in Spring


Transaction error in Spring

Question:

Tag: java,spring,jpa

I have a project https://github.com/ivartanian/onlinecontrol in Spring MVC + JPA, initially worked with the Spring configuration through XML. Now I am trying to set up the project through JAVA Config (without XML). The project starts, but when I create a new user(entity User), an error transaction. But if I create another Entity this error not occur. If this XML configuration error does not occur too.

Please tell me what the cause of the error. I would be glad of any help

My XML config is:

    <context:component-scan
            base-package="com.vizaco.onlinecontrol.service"/>

    <!-- enables scanning for @Transactional annotations -->
    <tx:annotation-driven/>

    <!-- ========================= DATASOURCE DEFINITION ========================= -->

    <!-- Configurer that replaces ${...} placeholders with values from a properties file -->
    <!-- (in this case, JDBC-related settings for the dataSource definition below) -->
    <context:property-placeholder location="classpath:spring/data-access.properties" system-properties-mode="OVERRIDE"/>

    <!-- Database initializer. If any of the script fails, the initialization stops. -->
    <!-- As an alternative, for embedded databases see <jdbc:embedded-database/>. -->
    <jdbc:initialize-database data-source="dataSource">
        <jdbc:script location="${jdbc.initLocation}"/>
        <jdbc:script location="${jdbc.dataLocation}"/>
    </jdbc:initialize-database>

    <!-- DataSource configuration for the Jetty jdbc connection -->
    <bean id="dataSource" class="org.hsqldb.jdbc.JDBCDataSource">
        <property name="url">
            <value>${jdbc.url}</value>
        </property>
        <property name="user">
            <value>${jdbc.username}</value>
        </property>
        <property name="password">
            <value>${jdbc.password}</value>
        </property>
    </bean>


    <context:component-scan base-package="com.vizaco.onlinecontrol.dao.jpa"/>
    <context:component-scan base-package="com.vizaco.onlinecontrol.security"/>
    <context:component-scan base-package="com.vizaco.onlinecontrol.configuration"/>

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
          p:dataSource-ref="dataSource">
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"
                  p:database="${jpa.database}" p:showSql="${jpa.showSql}"/>
            <!-- the 'database' parameter refers to the database dialect being used.
                By default, Hibernate will use a 'HSQL' dialect because 'jpa.database' has been set to 'HSQL'
                inside file spring/data-access.properties

             -->
        </property>
    </bean>

    <!-- Transaction manager for a single JPA EntityManagerFactory (alternative to JTA) -->
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"
          p:entityManagerFactory-ref="entityManagerFactory"/>

    <bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>

    <!-- Voters -->
    <bean id="accessDecisionManager"
          class="org.springframework.security.access.vote.AffirmativeBased">
        <constructor-arg name="decisionVoters">
            <list>
                <bean class="org.springframework.security.access.vote.RoleVoter"/>
            </list>
        </constructor-arg>
    </bean>

    <!--<bean id="expressionHandler" class="org.springframework.security.access.expression.method.DefaultMethodSecurityExpressionHandler">-->
        <!--<property name="permissionEvaluator" ref="customPermissionEvaluator"/>-->
    <!--</bean>-->
    <!--<bean id="customPermissionEvaluator"  class="com.vizaco.onlinecontrol.security.impl.CustomPermissionEvaluator"/>-->

    <!-- SECURITY -->
    <bean id="passwordEncoder" class="org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder">
        <constructor-arg name="strength" value="11"/>
    </bean>

    <!-- Validators -->
    <bean id="userValidator" class="com.vizaco.onlinecontrol.validators.UserValidator"/>

    <!-- Messages -->
    <bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
        <property name="basename" value="classpath:messages"/>
        <property name="defaultEncoding" value="UTF-8"/>
    </bean>
    <bean id="localeResolver" class="org.springframework.web.servlet.i18n.CookieLocaleResolver">
        <property name="defaultLocale" value="ru"/>
    </bean>

    <!-- Converters -->
    <bean id="conversionService"
          class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
        <property name="converters">
            <set>
                <bean class="com.vizaco.onlinecontrol.converters.StringToClazz"/>
                <bean class="com.vizaco.onlinecontrol.converters.StringToUser"/>
            </set>
        </property>
    </bean>

</beans>

My Java config is:

@Configuration
@EnableWebMvc
@EnableAspectJAutoProxy
@EnableTransactionManagement
@ComponentScan({
        "com.vizaco.onlinecontrol.aspects",
        "com.vizaco.onlinecontrol.configuration",
        "com.vizaco.onlinecontrol.controller",
        "com.vizaco.onlinecontrol.dao",
        "com.vizaco.onlinecontrol.model",
        "com.vizaco.onlinecontrol.validators",
        "com.vizaco.onlinecontrol.security",
        "com.vizaco.onlinecontrol.service"})
@PropertySource("classpath:spring/data-access.properties")
public class WebConfig extends WebMvcConfigurerAdapter implements TransactionManagementConfigurer {

    @Autowired
    Environment environment;

    @Autowired
    private ClazzService clazzService;

    @Autowired
    private UserService userService;

    @Autowired
    private MethodSecurityMetadataSourceAdvisor sourceAdvisor;

    @Bean
    public UserDetailsService userDetailsService() {
        return new CustomUserDetailsServiceImpl();
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Bean
    public DataSource dataSource() {
        JDBCDataSource dataSource = new JDBCDataSource();
        dataSource.setUrl(environment.getProperty("jdbc.url"));
        dataSource.setUser(environment.getProperty("jdbc.username"));
        dataSource.setPassword(environment.getProperty("jdbc.password"));
        return dataSource;
    }

    @Bean
    public DataSourceInitializer dataSourceInitializer() {
        DataSourceInitializer dataSourceInitializer = new DataSourceInitializer();
        dataSourceInitializer.setDataSource(dataSource());

        CompositeDatabasePopulator compositeDatabasePopulator = new CompositeDatabasePopulator();

        compositeDatabasePopulator.addPopulators(new ResourceDatabasePopulator(new DefaultResourceLoader().getResource(environment.getProperty("jdbc.initLocation"))));
        compositeDatabasePopulator.addPopulators(new ResourceDatabasePopulator(new DefaultResourceLoader().getResource(environment.getProperty("jdbc.dataLocation"))));
        dataSourceInitializer.setDatabasePopulator(compositeDatabasePopulator);
        return dataSourceInitializer;
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(dataSource());
        em.setPackagesToScan(new String[]{"com.vizaco.onlinecontrol.model"});

        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setDatabase(Database.HSQL);
        vendorAdapter.setShowSql(true);

        em.setJpaVendorAdapter(vendorAdapter);

        Properties properties = new Properties();
        properties.setProperty("hibernate.dialect", "org.hibernate.dialect.HSQLDialect");

        em.setJpaProperties(properties);

        return em;
    }

    @Bean
    public PlatformTransactionManager txManager() {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());

        return transactionManager;
    }

    @Override
    public PlatformTransactionManager annotationDrivenTransactionManager() {
        return txManager();
    }

    @Bean
    public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
        return new PersistenceExceptionTranslationPostProcessor();
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/WEB-INF/jsp/**").addResourceLocations("/jsp/");
        registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
        registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    @Override
    public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
        configurer.favorPathExtension(true)
                .useJaf(false)
                .ignoreAcceptHeader(true)
                .mediaType("html", MediaType.TEXT_HTML)
                .mediaType("json", MediaType.APPLICATION_JSON)
                .defaultContentType(MediaType.TEXT_HTML);
    }

    @Override
    public void configureViewResolvers(ViewResolverRegistry registry) {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/jsp/");
        resolver.setSuffix(".jsp");
        resolver.setViewClass(JstlView.class);

        registry.viewResolver(resolver);

        registry.beanName();
    }

    @Override
    public void addFormatters(FormatterRegistry registry) {
        registry.addConverter(new StringToClazz(clazzService));
        registry.addConverter(new StringToUser(userService));
    }

    @Bean(name = "messageSource")
    public MessageSource configureMessageSource() {
        ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
        messageSource.setBasename("classpath:messages");
        messageSource.setCacheSeconds(5);
        messageSource.setDefaultEncoding("UTF-8");
        return messageSource;
    }

    @Bean
    public CookieLocaleResolver localeResolver() {
        CookieLocaleResolver localeResolver = new CookieLocaleResolver();
        localeResolver.setDefaultLocale(new Locale("ru"));
        return localeResolver;
    }

}

The error occurs when you call this.em.persist(user) in the method save(User user):

@Repository
public class JpaUserDaoImpl implements UserDao {

    @PersistenceContext
    private EntityManager em;

    public JpaUserDaoImpl() {
    }

    public JpaUserDaoImpl(EntityManager em) {
        this.em = em;
    }

    @Override
    public User findByEmail(String email) throws DataAccessException {
        Query query = this.em.createQuery("SELECT DISTINCT user FROM User user WHERE user.email =:email");
        query.setParameter("email", email);

        List resultList = query.getResultList();
        if (resultList.isEmpty()) {
            return null; // handle no-results case
        } else {
            return (User)resultList.get(0);
        }

//        return (User) query.getSingleResult();
    }

    @Override
    public User findById(Long id) {
        Query query = this.em.createQuery("SELECT DISTINCT user FROM User user WHERE user.id =:id");
        query.setParameter("id", id);

        List resultList = query.getResultList();
        if (resultList.isEmpty()) {
            return null; // handle no-results case
        } else {
            return (User)resultList.get(0);
        }
    }

    @Override
    public List<User> getAllUsers() throws DataAccessException {
        Query query = this.em.createQuery("SELECT DISTINCT user FROM User user");
        return query.getResultList();
    }

    @Override
    public void save(User user) {

        if (user == null){
            return;
        }

        if (user.getId() == null) {
            this.em.persist(user);
        }
        else {
            this.em.merge(user);
        }
    }

    @Override
    public void delete(User user) throws DataAccessException {
        if (user == null){
            return;
        }
        this.em.remove(user);
    }

}

That error:

javax.persistence.TransactionRequiredException: No transactional EntityManager available
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:275)
    at com.sun.proxy.$Proxy64.persist(Unknown Source)
    at com.vizaco.onlinecontrol.dao.jpa.JpaUserDaoImpl.save(JpaUserDaoImpl.java:68)
    at com.vizaco.onlinecontrol.service.impl.UserServiceImpl.saveUser(UserServiceImpl.java:51)
    at com.vizaco.onlinecontrol.controller.UserController.createUser(UserController.java:112)
    at com.vizaco.onlinecontrol.controller.UserController$$FastClassBySpringCGLIB$$2ef7ce5a.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:717)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:52)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.aspectj.AspectJAfterAdvice.invoke(AspectJAfterAdvice.java:43)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653)
    at com.vizaco.onlinecontrol.controller.UserController$$EnhancerBySpringCGLIB$$9f848f41.createUser(<generated>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:806)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:146)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:105)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:57)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:550)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1128)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1062)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113)
    at org.eclipse.jetty.server.Server.handle(Server.java:507)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:284)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:237)
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:240)
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:93)
    at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:53)
    at org.eclipse.jetty.util.thread.strategy.ExecuteProduceRun.produceAndRun(ExecuteProduceRun.java:191)
    at org.eclipse.jetty.util.thread.strategy.ExecuteProduceRun.run(ExecuteProduceRun.java:126)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:641)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:559)
    at java.lang.Thread.run(Thread.java:745)

Answer:

In the stacktrace, there are no Spring AOP class listed between these two lines:

   at com.vizaco.onlinecontrol.service.impl.UserServiceImpl.saveUser(UserServiceImpl.java:51)
    at com.vizaco.onlinecontrol.controller.UserController.createUser(UserController.java:112)

Your Dependency Injection is not setup right.. the Controller should be getting a Spring Bean of UserService


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java,literals,octal
This question already has an answer here: How does a leading zero change a numeric literal in Java? 3 answers Here is some code in java on datatypes: class Test { public static void main(String args[]) { int i = -0777; System.out.println(i); } } The output of the above...

Get document on some condition in elastic search java API


java,elasticsearch,elasticsearch-plugin
As I know we can parse document in elastic search, And when we search for a keyword, It will return the document using this code of java API:- org.elasticsearch.action.search.SearchResponse searchHits = node.client() .prepareSearch() .setIndices("indices") .setQuery(qb) .setFrom(0).setSize(1000) .addHighlightedField("file.filename") .addHighlightedField("content") .addHighlightedField("meta.title") .setHighlighterPreTags("<span class='badge badge-info'>") .setHighlighterPostTags("</span>") .addFields("*", "_source")...

Get network interfaces on remote machine


java,network-programming
I know in java we can do NetworkInterface.getNetworkInterfaces() to get all available network interfaces on local machine. Can we do similar thing where I can pass host name to get the NICs(with IPs) which are up and running?

type conversion if flex


java,actionscript-3,flex
I am using Flerry as Java-Flex bridge for my Flex Desktop Application. How to convert List in Java to ArrayCollection in Flex Flex Code:- [Bindable]public var screenList:ArrayCollection; <flerry:NativeObject id="windowControllerObj" source="ls.window.EnumAllWindowNames" singleton="true" fault="windowControllerObj_faultHandler(event)"> <flerry:NativeMethod id="getWindowNames" name="getAllWindowNames" result="windowControllerObj_resultHandler(event)" fault="getWindowNames_faultHandler(event)"/>...

Android set clickable text to go one fragment to another fragment


java,android,android-fragments,spannablestring
I need to do something like this. Suppose I have 2 fragments A and B.There is a text which can be clickable in fragment A and when user click this text , he can go to fragment B. This example helped me to do it but I think it does...

App Not Downloading Newest Version Of File [Java]


java,caching,download
Okay, I've been trying to figure this out for a few hours and it's starting to kill me. I wrote a primitive version checker for an app I work on every once and awhile. It's just a simple for fun project. The version checker has been a pain though. It...

Can I install 2 or more Android SDK when using Eclipse


java,android,eclipse,sdk,versions
I am new to android developments. I am setting up my android development environment using Eclipse. I have a test smart phone with Android version 4.2.2. The automatic installation installed the latest Android SDK version, which is 5.1.1. My questions are: 1. Do I have to install the SDK version...

Using world coordinates


java,libgdx
I am currently using pixels as units for placing objects within my world, however this can get tedious because I only ever place objects every 16 pixels. For example, I would like to be able to place an object at position 2 and have the object rendered at the pixel...

@RestController throws HTTP Status 406


java,spring,rest,maven
I am working on a basic Hello World program using Spring and Restful webservices. But when I try to call my service I am getting below error message: HTTP Status 406 - description - The resource identified by this request is only capable of generating responses with characteristics not acceptable...

Get current latitude and longitude android


java,android,gps,geolocation,location
Requirement: 1.Sometimes(not everytime) I am getting latitude and longitude 0.0. 2.I want to know how to get the location update after user has enabled the gps from the settings. Here is my code public class GPSTracker extends Service implements LocationListener { private final Context mContext; // flag for GPS status...

PropertyNotFoundException in jsp


java,jsp
Am getting this error in my application javax.el.PropertyNotFoundException: Property 'survey_id' not found on type com.moh.forms.MOH731 javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:229) javax.el.BeanELResolver$BeanProperties.access$400(BeanELResolver.java:206) javax.el.BeanELResolver.property(BeanELResolver.java:317) javax.el.BeanELResolver.getValue(BeanELResolver.java:85) This is my MOH731.java @Id @GeneratedValue(strategy = GenerationType.AUTO) private int survey_id; public MOH731 (int survey_id, String uname)...

Reading and modifying the text from the text file in Java


java
I am have a project that need to modify some text in the text file. Like BB,BO,BR,BZ,CL,VE-BR I need make it become BB,BO,BZ,CL,VE. and HU, LT, LV, UA, PT-PT/AR become HU, LT, LV, UA,/AR. I have tried to type some code, however the code fail to loop and also,in this...

How to do custom rounding of numbers in Java?


java,rounding
Suppose I want to round numbers that have mantissa greater than 0.3 'up' and those below 'down'. How can I do it in Java? The only thing that came to my mind was Math.round(), but I can't seem to make it follow a certain rule....

Finding embeded xpaths in a String


java,regex
I have a string where I have the user should be able to specify xpaths that will be evaluated at runtime. I was thinking about having a the following way to specify it. String = "Hi my name is (/message/user) how can i help you with (/message/message) "; How can...

count items in a column vaadin


java,vaadin
Good day everyone! How do I get the number of items that a column contains? I want to hide the "Workgroup" column if it's empty, I just don't know how. Table tblTeachings = new Table(); tblTeachings.addContainerProperty("#", Integer.class,0); tblTeachings.addContainerProperty("Course",String.class,""); tblTeachings.addContainerProperty("Teaching name",String.class,""); tblTeachings.addContainerProperty("Start date",String.class,""); tblTeachings.addContainerProperty("End Date",String.class,""); tblTeachings.addContainerProperty("Activity...

Getting particular view from expandable listview


java,android,listview,android-fragments,expandablelistview
In my list view I have an textview in expandable group and I want to open the dialog when textview is clicked to fill the information through edittext and update textview. Problem: how could I get the groupview textview item in my fragment oncreateview() method....

WebDriver can't get dropdown menu element (Java)


java,selenium,webdriver,junit4
I write a script on Java for Selenium WebDriver, and I have a problem with selected from dropdown menu. Here's my locator: new Select(driver.findElement(By.id("FormElement_select_68_input_input"))).selectByVisibleText("Image"); Here's an error: http://prntscr.com/7jul03 Here's HTML code: http://prntscr.com/7jvou6 Need to select "Image" from this menu, but have an error. Before I had the error like this,...

Android String if-statement


java,android,string
I have a if-statement in the start of my app if (ready.equals("yes")){ ... } and later on my code I have ready="yes"; but the if statement is never called, why? The ready="yes"; is called from a background thread, is that why? public void DownloadFromUrl(final String fileName) { //this is the...

BitmapFont class does not have getBound(String) method


java,android,libgdx
Previously I used getBound method for BitmapFont class in libgdx, but now, I am unable to use it. I cannot find the changes in latest version. Any help is appreciated. Thank you...

Unfortunately, (My app) has stopped. Eclipse Android [duplicate]


java,android,eclipse,adt
This question already has an answer here: What is a Null Pointer Exception, and how do I fix it? 12 answers I'm a beginner in android developing and I'm trying to build a simple app but I'm getting this error in the emulator.(Unfortunately,(App) has unexpectedly stopped). LogCat http://i.stack.imgur.com/VZhuL.png package...

Android Implicit Intent for Viewing a Video File


java,android,android-intent,uri,avd
In my Android app, I have a button that when clicked, launches the external application of my choice to play a video (I gather that this is called an "implicit intent"). Here is the relevant Java code from my onCreate method. Button button = (Button) findViewById(R.id.button); button.setOnClickListener ( new Button.OnClickListener()...

How can implement long running process in spring hibernate?


java,spring,hibernate
as we know the struts interceptor execute and wait will take care of long running process by not getting the request to timeout and destroy it sends wait and at last the desired response i want to implement the same for long running process in spring and hibernate. Thanks....

Selenium catch popup on close browser


java,selenium,browser
I'm trying to test that when I close my window a popup shows with a warning message. I've tried both driver.close() and driver.quit() after making sure I'm on the proper window but this just terminates the process since my popup doesn't show. I could test it by using the awt...

Logging operations in lightadmin


java,spring,logging,lightadmin
I have a Java web application which use Spring and Hibernate and I plan to use lightadmin to provide an administration interface. However, I found very little information about the logging part of lightadmin : if I have such an adminsitration interface, I would like that any operation made to...

why java API prevents us to call add and remove together?


java,list,collections,listiterator
As per Java API- IllegalStateException - if neither next nor previous have been called, or remove or add have been called after the last call to next or previous remove()- Removes from the list the last element that was returned by next() or previous() (optional operation). This call can only...

Dynamic creation of objects vs storing them as fields


java,performance,object
I have this loop which runs about 1,000,000 times. while ((line = br.readLine()) != null) { if(!(line.isEmpty())){ data = new JSONObject(line); name = (String)data.get("name"); surname = (String)data.get("surname"); ar.put(name, surname); //an array } } What are the advantages (if any) in terms of efficiency of having it like that were data,name...

SOAP Client, Following an example


java,soap,saaj
I need to consume a SOAP Server named "Mouser" for my company. However I have a problem when I try to send a message. The documentation of my request is : POST /service/searchapi.asmx HTTP/1.1 Host: www.mouser.fr Content-Type: application/soap+xml; charset=utf-8 Content-Length: length <?xml version="1.0" encoding="utf-8"?> <soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope"> <soap12:Header> <MouserHeader...

setOnClickListener error Null object


java,android
I saw many questions like mine and I try to fix my codes but failed... this is my code: public class MainActivity extends ActionBarActivity { EditText usernameEditText; EditText passwordEditText; public Button saveme; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); usernameEditText = (EditText) findViewById(R.id.username); passwordEditText = (EditText) findViewById(R.id.pass); saveme = (Button)...

Trouble with Login using Spring Boot and JDBC Security


spring,spring-security,spring-boot
My build.gradle file: task wrapper(type: Wrapper) { gradleVersion = '2.4' } buildscript { repositories { mavenCentral() maven { url "http://repo.spring.io/release" } } dependencies { classpath("org.springframework.boot:spring-boot-gradle-plugin:1.2.3.RELEASE") } } apply plugin: 'java' apply plugin: 'spring-boot' repositories { mavenCentral() maven { url "http://repo.spring.io/release" } } dependencies { compile("org.springframework.boot:spring-boot-starter-web") compile("org.springframework.boot:spring-boot-starter-jdbc")...

How to check if an ExecutionResult is empty in Neo4j


java,neo4j
I am executing a query in neo4j using java. I don't know how to check if the execution result is empty. Here is my code. String firstquery=" start n=node(*) match(b)-[relatedto]->(n) where b.value=\""+applicationName+"\" return n"; ExecutionResult execResult = execEngine.execute(firstquery); System.out.println("executing query"); String results = execResult.dumpToString(); System.out.println(results); Iterator<Node> n_column1 = execResult.columnAs( "n"...

how to call Java method which returns any List from R Language? [on hold]


java,r,rjava
How to call java method which returns list from R Language.

Bulkheading strategies for Akka actors


java,asynchronous,akka,blocking,future
I have a scenario where an important actor needs to make a call to a slow (15 - 20 seconds) remote system: // Non-actor code equivalent public Result makeSlowNetworkCall(Request request) { Result result = slowServiceClient.soooooSlow(request); // Could be up to 15 - 20 SECONDS (mehhhh) return result; } The Akka...