小编Aru*_*run的帖子

在Java 8中,@FunctionalInterface引入了注释以表示任何具有一个抽象方法作为功能接口的接口.引入它的原因之一是指示用户(程序员),lambda表达式可以在功能接口的上下文中使用.

该Comparator接口都被注解@FunctionalInterface.但是,两种方法都是抽象的.

int compare(T o1, T o2);

和

boolean equals(Object obj);

在文档中FunctionalInterface,它被明确提及为

从概念上讲,功能界面只有一种抽象方法.

这个equals方法不是被认为是抽象的吗？

我使用maven-eclipse创建了一个新的Spring MVC项目,并抛出以下错误:

(我尝试了一些来自stackoverflow的解决方案,这在我的情况下不起作用.我找不到pom.xml的一些问题.我添加了servlet-api提供的范围,并尝试了哪些也无效.)

SEVERE: Servlet /Remindem threw load() exception
java.lang.ClassCastException: org.springframework.web.servlet.DispatcherServlet 
  cannot be cast to javax.servlet.Servlet

我的pom.xml如下:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>com.org</groupId>
<artifactId>Remindem</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>

<name>Remindem</name>
<url>http://maven.apache.org</url>

<dependencies>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.0.1</version>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.maven</groupId>
        <artifactId>maven-plugin-api</artifactId>
        <version>2.0</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>3.6.8.Final</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>4.0.0.Beta2</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.6</version>
    </dependency>
    <dependency>
        <groupId>javassist</groupId>
        <artifactId>javassist</artifactId>
        <version>3.12.1.GA</version>
    </dependency>
    <dependency>
        <groupId>javax.mail</groupId>
        <artifactId>mail</artifactId>
        <version>1.4</version>
    </dependency>

    <!-- Spring framework …

使用 AmazonS3 类中的方法将内容添加到 S3 文件的现有方法是

• 通过带有 InputStream 的 putObject
• 创建包含内容的本地文件并将其上传到 S3。

有没有办法为现有的 S3 对象创建一个 OutputStream 对象，列表中的值可以写入其中？我看到没有这样做的 API。

尝试使用两个JPanel创建一个JSplitPane.使用以下代码:

 JTable table = new JTable(qualifierModel);
  table.setDefaultEditor(String.class, new QualifierCellEditor());


  JPanel qualiferPanel = new JPanel();
  JScrollPane jp = new JScrollPane(table);
  qualiferPanel.add(new JLabel(Translator.getText("Select one qualifier for each section # from the table.")));
  qualiferPanel.add(jp);
  qualiferPanel.setVisible(true);

  JToolBar btnBar = new JToolBar();
  btnBar.setFloatable(false);
  btnBar.add(Box.createHorizontalGlue());
  btnBar.add(addItemButton);
  btnBar.add(removeItemButton);
  setLayout(new BorderLayout());


  profilePanel.add(new JScrollPane(profileTable), BorderLayout.NORTH);
  profilePanel.add(btnBar, BorderLayout.SOUTH);

  JSplitPane spane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
  spane.setTopComponent(profilePanel);
  spane.setBottomComponent(qualiferPanel);

  setLayout(new BorderLayout());
  add(spane,BorderLayout.CENTER);

我在第一个JPanel中添加了两个添加按钮,这些按钮是不可见的.我应该如何调整第一个JPanel的大小.

当我使用eclipse和maven创建一个新的Spring MVC项目时,当我作为maven build运行时,它会抛出以下错误(目标是tomcat:run).我在清理和安装后完成了构建.

严重:配置类org.springframework.web.context.ContextLoaderListener的应用程序侦听器时出错

java.lang.ClassNotFoundException:org.springframework.web.context.ContextLoaderListener

1. 此问题的其他解决方案是从项目属性中添加部署程序集中的maven依赖项.
2. 但是,当我右键单击属性时,不存在部署程序集选项.
3. 我也尝试手动添加spring.jar.
4. org.springframework.web.context.ContextLoaderListener类存在于maven依赖项中,但仍然会引发错误.

的pom.xml

我的pom.xml如下:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.org</groupId>
    <artifactId>Remindem</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>Remindem</name>
    <url>http://maven.apache.org</url>

    <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.0.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.maven</groupId>
            <artifactId>maven-plugin-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>3.6.8.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>4.0.0.Beta2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>
        <dependency>
            <groupId>javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.12.1.GA</version>
        </dependency>
        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4</version>
        </dependency>

        <!-- Spring framework -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring</artifactId> …

我试图将一个字符串转换为日期...但返回值是错误的.

String startDate = "2013-07-24";
Date date = new Date();
try{         
    DateFormat formatter = new SimpleDateFormat("yyyy-MM-DD"); 
    date = (Date)formatter.parse(startDate);
    System.out.println(date);    
}
catch(Exception e){
    e.printStackTrace();
}

所需的输出是:

周日7月25日00:00:00 CDT 2013

但实际输出是:

2013年1月25日星期五00:00:00 CST

七月的月份如何变成一月？

我有两个类 Game 和 Team ，它们之间存在多对多关系。

游戏：

@Entity
@Table(name = "GAME")
public class Game extends Model {

 @ManyToMany(cascade = {CascadeType.ALL})
    @JoinTable(name="GAME_TEAM", 
                joinColumns={@JoinColumn(name="GAME_ID")}, 
                inverseJoinColumns={@JoinColumn(name="TEAM_ID")})
private List<Team> teams = new ArrayList<Team>();

public List<Team> getTeams() {
    return teams;
}

public void setTeams(List<Team> teams) {
    this.teams = teams;
}
}

团队：

@Entity
@Table(name = "TEAM")

public class Team extends Model {


@Column(name = "TEAM_NAME")
private String teamName;

@OneToMany(mappedBy = "team", fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval = true)
private Set<Player> player = new LinkedHashSet<Player>(); …

我正在尝试运行一个junit测试用例来测试applicationcontext是否已初始化并抛出以下错误.它是与xml还是java版本相关的东西.我该如何解决？

  org.springframework.beans.factory.BeanDefinitionStoreException: Parser configuration exception parsing XML from class path resource [tasospring-online-context.xml]; nested exception is javax.xml.parsers.ParserConfigurationException: Unable to validate using XSD: Your JAXP provider [org.apache.crimson.jaxp.DocumentBuilderFactoryImpl@82701e] does not support XML Schema. Are you running on Java 1.4 with Apache Crimson? Upgrade to Apache Xerces (or Java 1.5) for full XSD support.
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:404)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:174)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:209)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:243)
    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)
    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)
    at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:130)
    at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:537)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:451)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at com.roger.tas.manager.util.OnlineSpringBootStrapper.initialize(OnlineSpringBootStrapper.java:23) …