我正在尝试运行一个spring-boot应用程序,它通过spring-jpa使用hibernate,但是我收到了这个错误:
Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:104)
at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:71)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:205)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:111)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:234)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206)
at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1885)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1843)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:843)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:398)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:842)
at org.hibernate.jpa.HibernatePersistenceProvider.createContainerEntityManagerFactory(HibernatePersistenceProvider.java:152)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:336)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:318)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1613)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1550)
... 21 more
我的pom.xml文件是这样的:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.1.8.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-taglibs</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId> …在Spring Boot 1.1.5和1.1.6中都有这个问题 - 我正在使用@Value注释加载一个类路径资源,当我在STS(3.6.0,Windows)中运行应用程序时,它可以正常工作.但是,当我运行mvn包然后尝试运行jar时,我得到FileNotFound异常.
资源message.txt位于src/main/resources中.我检查了jar并验证它在顶层包含文件"message.txt"(与application.properties相同的级别).
这是应用程序:
@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application implements CommandLineRunner {
private static final Logger logger = Logger.getLogger(Application.class);
@Value("${message.file}")
private Resource messageResource;
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
@Override
public void run(String... arg0) throws Exception {
// both of these work when running as Spring boot app from STS, but
// fail after mvn package, and then running as java -jar
testResource(new ClassPathResource("message.txt"));
testResource(this.messageResource);
}
private void testResource(Resource resource) {
try { …我正在将我的selenium 1代码转换为selenium 2,并且找不到任何简单的方法来在下拉菜单中选择标签或获取下拉列表的选定值.你知道如何在Selenium 2中做到这一点吗？
以下是两个在Selenium 1中有效但在2中不起作用的语句:
browser.select("//path_to_drop_down", "Value1");
browser.getSelectedValue("//path_to_drop_down");
我有一个users表和一个payments表,对于每个用户,其中有付款,可能在payments表中有多个相关的付款.我想选择所有付款用户,但只选择最新付款.我正在尝试这个SQL,但我从来没有尝试过嵌套的SQL语句,所以我想知道我做错了什么.感谢帮助
SELECT u.*
FROM users AS u
INNER JOIN (
SELECT p.*
FROM payments AS p
ORDER BY date DESC
LIMIT 1
)
ON p.user_id = u.id
WHERE u.package = 1
随 20.3 版一起发布的新 pip 依赖项解析器安装包的时间过长。昨天在我们的 CI 管道中，在 1 小时的 pip 安装消息之后，过去需要约 10 分钟的 docker 构建超时（几乎对于任何依赖项安装的每个库，都有类似的日志输出）：
INFO: pip is looking at multiple versions of setuptools to determine which version is compatible with other requirements. This could take a while.
Downloading setuptools-50.0.0-py3-none-any.whl (783 kB)
Downloading setuptools-49.6.0-py3-none-any.whl (803 kB)
Downloading setuptools-49.5.0-py3-none-any.whl (803 kB)
Downloading setuptools-49.4.0-py3-none-any.whl (803 kB)
Downloading setuptools-49.3.2-py3-none-any.whl (790 kB)
INFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce …如何POST使用Jersey 获取请求的完整HTTP REST请求主体？
在我们的例子中,数据将是XML.大小从1K到1MB不等.
该文件似乎表明,你应该使用MessageBodyReader,但我看不到任何的例子.
我是新手使用JAX-RS并编写了一个输出json对象的示例应用程序.但我得到一个例外.这是我的代码:
@Path("/hello")
public class HelloWorldService {
@GET
@Path("/query/{artist_id}")
@Produces("application/json")
public Data getMsg(@PathParam("artist_id") int artist_id,
@QueryParam("from") int from,
@QueryParam("to") int to) {
Data d=new Data();
d.setName("Mateen");
d.setRoll(77);
return d;
}
}
我的数据只是一个POJO类:
@XmlRootElement
public class Data {
private int roll;
private String name;
public int getRoll() {
return roll;
}
public void setRoll(int roll) {
this.roll = roll;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
我得到一个例外:
javax.ws.rs.WebApplicationException:
com.sun.jersey.api.MessageException:
A message …我只是想知道所有这些注释之间的区别.我们为什么要使用这些...意味着它们没有影响,尤其是字段级别和属性级别.
使用混合级注释的目的是什么:
@Entity
@Access(AccessType.FIELD)
class Employee {
// why their is a field level access
private int id;
// whats the purpose of transient here
@Transient
private String phnnumber;
// why its a property level access
@Access(AccessType.property)
public String getPhnnumber() {
return "1234556";
}
}
这堂课到底是什么意思？
我将我的应用程序的一部分从活动切换到碎片,以便我可以使用整洁的ActionBar选项卡.
但是,在完成转换后,我遇到了一个问题:每当我切换到另一个选项卡时,Fragment都会重新创建.每次进入选项卡时都会调用onCreate和onCreateView.
我有4个选项卡,每个选项卡都打开这些片段之一:
Fragment ShopFragment = new WebActivity();
Fragment SearchFragment = new SearchActivity(context);
Fragment StoreFragment = new StoreLocatorActivity(context, this);
Fragment BlogsFragment = new BlogsActivity(context, this);
这是我的监听器代码:
class MyTabsListener implements ActionBar.TabListener {
public Fragment fragment;
public MyTabsListener(Fragment fragment) {
this.fragment = fragment;
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
ft.hide(fragment);
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
ft.replace(R.id.fragment_container, fragment);
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
}
有人可以指点我正确的方向吗？
android android-fragments android-activity android-actionbar
我有一个spring-boot应用程序,我想用外部配置文件运行.当我以jar形式运行它(带有嵌入式servlet容器)时,一切都很好.但我想在外部servlet容器(Tomcat)下运行它,这里我有外部配置问题.我尝试过@PropertySource,但在这种情况下,应用程序只获取war文件配置中不存在的属性:外部配置不会覆盖内部配置.所以问题是:如何配置外部配置以覆盖内部配置？