Maven hibernate - System.out.println不起作用

时间:2015-12-05 12:15:32

标签: java eclipse hibernate maven

我在eclipse中创建了一个Maven项目,我选择了Archetype webapp-javaee7 使用GroupId:myGroup和ArchetypId:myArchetype。

在我完成之后,我添加了hibernate依赖项:

  1. 冬眠核
  2. 冬眠的注解
  3. hibernate-entity manage
  4. postgresql jdbc driver
  5. 当我在服务器上运行我的应用程序时,它会正确显示Hello World html页面 并且它还使用适当的jar填充Maven依赖项列表。

    当我在包myGroup.myArtifact中创建一个类时,我的System.out.println不起作用。

    package myGroup.myArtifact;
    
    public class TestClass {
    
    System.out.println("123");
    }
    

    我收到以下错误: "语法错误' 123'删除此标记",令牌上的语法erorr,misplace construct(s)

    这不起作用:

    java.lang.System.out.println("123");
    

    我的pom.xml文件:

    <?xml version="1.0" encoding="UTF-8"?>
    

    http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
    <groupId>myGroup</groupId>
    <artifactId>myArtifact</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    
    <name>myArtifact</name>
    
    <properties>
        <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    
    <dependencies>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.0.4.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>5.0.4.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-annotations</artifactId>
            <version>3.5.6-Final</version>
        </dependency>
    </dependencies>
    
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                    <compilerArguments>
                        <endorseddirs>${endorsed.dir}</endorseddirs>
                    </compilerArguments>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.3</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>2.6</version>
                <executions>
                    <execution>
                        <phase>validate</phase>
                        <goals>
                            <goal>copy</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${endorsed.dir}</outputDirectory>
                            <silent>true</silent>
                            <artifactItems>
                                <artifactItem>
                                    <groupId>javax</groupId>
                                    <artifactId>javaee-endorsed-api</artifactId>
                                    <version>7.0</version>
                                    <type>jar</type>
                                </artifactItem>
                            </artifactItems>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
    

1 个答案:

答案 0 :(得分:0)

问题的Hibernate和Maven相关部分与您的问题无关。

问题是你正试图从一个没有意义的地方执行一项功能。如果您希望println能够正常运行,那么您至少需要一个main方法:

public class TestClass {
   public static void main (String[] args)) {
      System.out.println("123");
   }
}