[英]problem with spring boot component scanning
我正在編寫具有兩個實體類Teacher和Department的spring boot應用程序。 我正在使用JPA和H2內存數據庫。 當我運行時,應用程序表未在h2數據庫中創建。 我已指定要使用@componentScan批注進行掃描的程序包,但我認為spring找不到實體類的位置。
應用類別
package com.H2DatabaseDemo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
@ComponentScan(basePackages="com.H2DatabaseDemo")
public class H2DatabaseDemoApplication {
public static void main(String[] args) {
SpringApplication.run(H2DatabaseDemoApplication.class, args);
}
}
作者實體
package com.H2DatabaseDemo.model;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
@Entity
public class Author {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private long id;
private String title;
private String body;
public Author() {}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getBody() {
return body;
}
public void setBody(String body) {
this.body = body;
}
}
郵政實體
package com.H2DatabaseDemo.model;
import java.awt.List;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
@Entity
public class Post {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private long id;
private String name;
public Post() {}
public Post(long id, String name) {
this.id = id;
this.name = name;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
這是我的pom.xml文件-
<?xml version="1.0" encoding="UTF-8"?>
<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.H2DatabaseDemo</groupId>
<artifactId>H2DatabaseDemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>H2DatabaseDemo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
堆棧跟蹤-:: Spring Boot ::(v2.0.4.RELEASE)
2018-09-13 18:00:07.448信息12584 --- [main] cHH2DatabaseDemoApplication:使用PID 12584在DSKTOP-7NILS0D上啟動H2DatabaseDemoApplication(D:\\ springCourse \\ H2DatabaseDemo \\ target \\由Mrugesh在D:\\ springCourse \\ H2DatabaseDemo中啟動的類)2018-09-13 18:00:07.453 INFO 12584 --- [main] cHH2DatabaseDemoApplication:未設置活動配置文件,退回到默認配置文件:默認2018-09-13 18:00:07.539 INFO 12584 --- [main ] ConfigServletWebServerApplicationContext:刷新org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@17c1bced:啟動日期[Thu Sep 13 18:00:07 IST 2018]; 上下文層次結構的根2018-09-13 18:00:09.114信息12584 --- [main] trationDelegate $ BeanPostProcessorChecker:類型為[org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration的Bean'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' $$ EnhancerBySpringCGLIB $$ 934327a5]不適合所有BeanPostProcessor處理(例如:不符合自動代理的資格)2018-09-13 18:00:09.860信息12584 --- [main] osbwembedded.tomcat.TomcatWebServer :Tomcat已使用端口初始化:8080(http)2018-09-13 18:00:09.892 INFO 12584 --- [main] o.apache.catalina.core.StandardService:正在啟動服務[Tomcat] 2018-09- 13 18:00:09.893 INFO 12584 --- [main] org.apache.catalina.core.StandardEngine:啟動Servlet引擎:Apache Tomcat / 8.5.32 2018-09-13 18:00:09.903 INFO 12584 --- [ ost-startStop-1] oacatalina.core.AprLifecycleListener:基於APR的Apache Tomcat本機庫,可在產品中實現最佳性能 在java.library.path上找不到可用的環境:[C:\\ Program Files \\ Java \\ jre1.8.0_171 \\ bin; C:\\ WINDOWS \\ Sun \\ Java \\ bin; C:\\ WINDOWS \\ system32; C:\\ WINDOWS; C:/ Program Files / Java / jre1.8.0_171 / bin / server; C:/ Program Files / Java / jre1.8.0_171 / bin; C:/ Program Files / Java / jre1.8.0_171 / lib / amd64 ; C:\\ Program Files(x86)\\ Intel \\ iCLS Client \\; C:\\ Program Files(x86)\\ Common Files \\ Oracle \\ Java \\ javapath; C:\\ Program Files \\ Intel \\ iCLS Client \\; C:\\ WINDOWS \\ system32; C:\\ WINDOWS; C:\\ WINDOWS \\ System32 \\ Wbem; C:\\ WINDOWS \\ System32 \\ WindowsPowerShell \\ v1.0 \\; c:\\ Program Files(x86)\\ ATI Technologies \\ ATI.ACE \\ Core-Static ; C:\\ Program Files \\ Intel \\ WiFi \\ bin \\; C:\\ Program Files \\ Common Files \\ Intel \\ WirelessCommon \\; C:\\ Program Files(x86)\\ Intel \\ Intel(R)管理引擎組件\\ DAL; C :\\ Program Files \\ Intel \\ Intel(R)管理引擎組件\\ DAL; C:\\ Program Files(x86)\\ Intel \\ Intel(R)管理引擎組件\\ IPT; C:\\ Program Files \\ Intel \\ Intel(R)管理引擎組件\\ IPT; C:\\ Program Files \\ nodejs \\; C:\\ WINDOWS \\ System32 \\ OpenSSH \\; C:\\ Progra m Files \\ Git \\ cmd; C:\\ Program Files \\ Microsoft VS Code \\ bin; C:\\ Program Files \\ Microsoft VS Code \\ bin; C:\\ Users \\ Mrugesh \\ AppData \\ Roaming \\ npm; C:\\ Users \\ Mrugesh \\ AppData \\ Local \\ Microsoft \\ WindowsApps; C:\\ Users \\ Mrugesh \\ AppData \\ Local \\ GitHubDesktop \\ bin; C:\\ eclipse ;;。] 2018-09-13 18:00:10.046 INFO 12584 --- [ost- startStop-1] oaccC [Tomcat]。[localhost]。[/]:初始化Spring嵌入式WebApplicationContext 2018-09-13 18:00:10.047信息12584 --- [ost-startStop-1] osweb.context.ContextLoader:根WebApplicationContext:初始化在2516毫秒內完成2018-09-13 18:00:10.173 INFO 12584 --- [ost-startStop-1] osbwservlet.ServletRegistrationBean:Servlet調度程序Servlet映射到[/] 2018-09-13 18:00:10.179 INFO 12584 --- [ost-startStop-1] osbwservlet.ServletRegistrationBean:映射到[/ console / ]的 Servlet webServlet 2018-09-13 18:00:10.188 INFO 12584 --- [ost-startStop-1] osbwservlet.FilterRegistrationBean :映射過濾器:'characterEncodingFilter'到:[/ ] 2018-09-13 18:00:10.189 INFO 12584 --- [ost- startStop-1] osbwservlet.FilterRegistrationBean:映射過濾器:'hiddenHttpMethodFilter'到:[/ ] 2018-09-13 18:00:10.189 INFO 12584 --- [ost-startStop-1] osbwservlet.FilterRegistrationBean:映射過濾器:'httpPutFormContentFilter '到:[/ ] 2018-09-13 18:00:10.189信息12584 --- [ost-startStop-1] osbwservlet.FilterRegistrationBean:映射過濾器:'requestContextFilter'到:[/ *] 2018-09-13 18 :00:10.392 INFO 12584 --- [main] com.zaxxer.hikari.HikariDataSource:HikariPool-1-開始... 2018-09-13 18:00:10.667 INFO 12584 --- [main] com.zaxxer。 hikari.HikariDataSource:HikariPool-1-開始完成。 2018-09-13 18:00:10.733 INFO 12584 --- [main] j.LocalContainerEntityManagerFactoryBean:為持久性單元'default'構建JPA容器EntityManagerFactory 2018-09-13 18:00:10.754 INFO 12584 --- [main] o.hibernate.jpa.internal.util.LogHelper:HHH000204:處理PersistenceUnitInfo [名稱:默認...] 2018-09-13 18:00:10.863 INFO 12584 --- [main] org.hibernate.Version:HHH000412: Hibernate Core {5.2.17.Final} 2018-09-13 18:00:10.864 INFO 12584 --- [main] org.hibernate.cfg.Environment:HHH000206:hibernate.properties找不到2018-09-13 18:00 :10.910 INFO 12584 --- [main] o.hibernate.annotations.common.Version:HCANN000001:Hibernate Commons注釋{5.0.1.Final} 2018-09-13 18:00:11.034 INFO 12584 --- [main] org.hibernate.dialect.Dialect:HHH000400:使用方言:org.hibernate.dialect.H2Dialect 2018-09-13 18:00:11.581 INFO 12584 --- [main] ohtschema.internal.SchemaCreatorImpl:HHH000476:執行導入腳本' org.hibernate.tool.schema.internal.exec.Script SourceInputNonExistentImpl @ 6bcc3f27'2018-09-13 18:00:11.585 INFO 12584 --- [main] j.LocalContainerEntityManagerFactoryBean:為持久性單元'default'初始化的JPA EntityManagerFactory 2018-09-13 18:00:11.700 INFO 12584- [main] oswshandler.SimpleUrlHandlerMapping:將URL路徑[/ /favicon.ico]映射到[class org.springframework.web.servlet.resource.ResourceHttpRequestHandler類]類型的處理程序上2018-09-13 18:00:12.010 INFO 12584- [main] swsmmaRequestMappingHandlerAdapter:尋找@ControllerAdvice:org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@17c1bced:啟動日期[Thu Sep 13 18:00:07 IST 2018]; 上下文層次結構的根2018-09-13 18:00:12.060 WARN 12584 --- [main] aWebConfiguration $ JpaWebMvcConfiguration:默認情況下啟用spring.jpa.open-in-view。 因此,可以在視圖渲染期間執行數據庫查詢。 顯式配置spring.jpa.open-in-view以禁用此警告2018-09-13 18:00:12.147信息12584 --- [main] swsmmaRequestMappingHandlerMapping:將“ {[/ error]}”映射到公共org.springframework。 http.ResponseEntity> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)2018-09-13 18:00:12.149信息12584-[[main] swsmmaRequestMappingHandlerMapping:將“ {[/ error],produces = [text / html]}”映射到公共org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet。 http.HttpServletRequest,javax.servlet.http.HttpServletResponse)2018-09-13 18:00:12.183 INFO 12584 --- [main] oswshandler.SimpleUrlHandlerMapping:將URL路徑[/ webjars / ] 映射到類型為[class org。 springframework.web.servlet.resource.ResourceHttpRequestHandler] 2018-09-13 18:00:12.183信息12584 --- [main] oswshandler.SimpleUrlHandlerMapping:Mapped 類型[class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]類型的處理程序上的URL路徑[/ **] 2018-09-13 18:00:12.558 INFO 12584 --- [main] osjeaAnnotationMBeanExporter:注冊用於JMX暴露的bean在啟動時2018-09-13 18:00:12.560 INFO 12584 --- [main] osjeaAnnotationMBeanExporter:JMX暴露已自動檢測到名稱為'dataSource'的Bean 2018-09-13 18:00:12.565 INFO 12584 --- [ main] osjeaAnnotationMBeanExporter:位於MBean'數據源':作為MBean向JMX服務器注冊[com.zaxxer.hikari:name = dataSource,type = HikariDataSource] 2018-09-13 18:00:12.605 INFO 12584 --- [main] osbwembedded .tomcat.TomcatWebServer:Tomcat在端口8080(http)上啟動,上下文路徑為''2018-09-13 18:00:12.610 INFO 12584 --- [main] cHH2DatabaseDemoApplication:在5.598秒內啟動H2DatabaseDemoApplication(JVM正在運行為6.203)
嘗試配置
hibernate.hbm2ddl.auto
通過在application.properties中添加以下行來創建的值。
spring.jpa.hibernate.ddl-auto=create
我有同樣的問題,所以我嘗試了一下,並且有效。
希望這可以幫助。
您的實體類很好,但是您的H2控制台配置了默認數據庫( 如果我沒記錯的話,請使用 testdb )。 您至少應在H2控制台中指定URL以匹配您的數據庫名稱或相反的名稱。
您可以嘗試以下方法:
1在application.properties
文件中配置H2控制台訪問控制:
spring.h2.console.enabled=true
spring.h2.console.path=/h2-console
spring.datasource.url=jdbc:h2:mem:hddemo-app
2從http:// localhost:8080 / h2-console /訪問數據庫
3在H2控制台內部,將jdbc:h2:mem:hddemo-app
復制並粘貼到JDBC URL字段中。 將密碼字段保留為空,然后單擊連接按鈕。
4您應該在表中看到在項目中指定的實體。
在春天你有掃描兩個注解: - ComponentScan
掃描Component
注釋類和豆類產生出他們的( https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/context /annotation/ComponentScan.html ),以及EntityScan
用於為JPA和其他實體生成信息( https://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/autoconfigure/ domain / EntityScan.html )
在您的情況下,由於您嘗試生成實體而不是bean /組件,因此應使用@EntityScan
。
注意:Spring還支持自動配置: https : //docs.spring.io/spring-boot/docs/current/reference/html/using-boot-auto-configuration.html
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