ApplicationContextの開始エラー。条件レポートを表示するには、「デバッグ」を有効にしてアプリケーションを再実行します

Question

Intellijを使用してMavenでmy Javaを実行しようとすると、このエラーが発生します。

ApplicationContextの開始エラー。状態レポートを表示するには、「デバッグ」を有効にしてアプリケーションを再実行します。 2018-04-24 01：23：18.949 ERROR 22389 --- [main] o.s.boot.SpringApplication：アプリケーションの実行に失敗しました

助けてくれてありがとう！

メイン：

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

public static void main(String[] args) {
    SpringApplication.run(DemoApplication.class, args);
}
}

XML：

<?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.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>demo</name>
<description>Demo project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.1.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>
    <vaadin.version>8.3.1</vaadin.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
    </dependency>
    <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.vaadin</groupId>
        <artifactId>vaadin-spring-boot-starter</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>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-bom</artifactId>
            <version>${vaadin.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

package com.example.demo;

import org.springframework.data.annotation.Id;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;


@Entity
public class Todo {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;

private String text;

private boolean done;

public Todo() {

}

public Todo(String text) {this.text = text; }

public Todo(String text, boolean done) {
    this.text = text;
    this.done = done;
}

public String getText() { return text;}

public void setText(String text) { this.text = text; }

public boolean isDone() { return done; }

public void setDone(boolean done) { this.done = done; }

}

package com.example.demo;

import com.vaadin.icons.VaadinIcons;
import com.vaadin.server.VaadinRequest;
import com.vaadin.spring.annotation.SpringUI;
import com.vaadin.ui.*;
import com.vaadin.ui.themes.ValoTheme;
import org.springframework.beans.factory.annotation.Autowired;

@SpringUI
public class TodoUI extends UI {

private VerticalLayout root;

@Autowired
TodoLayout todoLayout;

@Override
protected void init(VaadinRequest request) {
    setupLayout();
    addHeader();
    addForm();
    addTodoList();
    addDeleteButton();
}

private void addDeleteButton() {
    root.addComponent(new Button("Delete completed"));
}

private void addTodoList() {
    todoLayout.setWidth("80%");
    root.addComponent(todoLayout);
}

private void addForm() {
    HorizontalLayout formLayout = new HorizontalLayout();
    formLayout.setWidth("80%");

    TextField task = new TextField();
    Button add = new Button("");
    add.addStyleName(ValoTheme.BUTTON_PRIMARY);
    add.setIcon(VaadinIcons.PLUS);

    formLayout.addComponentsAndExpand(task);
    formLayout.addComponents(add);

    root.addComponent(formLayout);
}

private void addHeader() {
    Label header = new Label("TODOs");
    header.addStyleName(ValoTheme.LABEL_H1);
    root.addComponent(header);
}

private void setupLayout() {
    root = new VerticalLayout();
    root.setDefaultComponentAlignment(Alignment.MIDDLE_CENTER);
    setContent(root);
}
}

インターフェースクラス：

package com.example.demo;

import org.springframework.data.jpa.repository.JpaRepository;

public interface TodoRepository extends JpaRepository<Todo, Long> {
}

レイアウト：

package com.example.demo;

import com.vaadin.spring.annotation.SpringComponent;
import com.vaadin.ui.VerticalLayout;

@SpringComponent
public class TodoLayout extends VerticalLayout {
}

SQL：

CREATE TABLE IF NOT EXISTS Todo(id IDENTITY PRIMARY KEY, done BOOLEAN, 
text VARCHAR )
DELETE FROM Todo;
INSERT INTO Todo VALUES(1, true, 'Prepare presentation');
INSERT INTO Todo VALUES(2, true, 'Procrastinate');
INSERT INTO Todo VALUES(3, FALSE, 'Have presentation');

アプリケーションを実行しようとした後のLOG-Trace：

Unconditional classes:
----------------------

    org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration

    org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration

    org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration

    org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration

    org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration



2018-04-24 10:23:25.299 ERROR 22637 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: No identifier specified for entity: com.example.demo.Todo
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.Java:1702) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.Java:579) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.Java:501) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.Java:317) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.Java:228) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.Java:315) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.Java:199) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.Java:1089) ~[spring-context-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.Java:859) ~[spring-context-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.Java:550) ~[spring-context-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.Java:140) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.Java:759) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.Java:395) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.Java:327) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.Java:1255) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.Java:1243) [spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
    at com.example.demo.DemoApplication.main(DemoApplication.Java:10) [classes/:na]
Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.example.demo.Todo
    at org.hibernate.cfg.InheritanceState.determineDefaultAccessType(InheritanceState.Java:266) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.hibernate.cfg.InheritanceState.getElementsToProcess(InheritanceState.Java:211) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.Java:730) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.processEntityHierarchies(AnnotationMetadataSourceProcessorImpl.Java:249) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.processEntityHierarchies(MetadataBuildingProcess.Java:222) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.Java:265) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.Java:861) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.Java:888) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.Java:57) ~[spring-orm-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.Java:365) ~[spring-orm-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.Java:390) ~[spring-orm-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.Java:377) ~[spring-orm-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.Java:341) ~[spring-orm-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.Java:1761) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.Java:1698) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    ... 16 common frames omitted

Disconnected from the target VM, address: '127.0.0.1:62208', transport: 'socket'

Process finished with exit code 1

Answer 1

このエラーが発生したときは、クラスのフィールド初期化またはコンストラクター（この場合、AuthenticationFilterはUsernamePasswordAuthenticationFilterを拡張しています）でアプリケーションコンテキストにアクセスしようとしていたため、CONTEXT IS利用可能です。

myField  = (MyClass)SpringApplicationContext.getBean(MyClass.BEAN_NAME);

このステートメントを、このクラスのライフサイクルの早い段階で、コンストラクターのずっと後に呼び出されるメソッドに移動することで、エラーは解決され、アプリは正常に起動しました。

Spring Bootの依存性注入モデルの不透明性の多くと同様に、本当に厄介なのは、1日の終わりにはNullPointerExceptionの典型的なケースでしたが、エラーが発生したクラスと行番号がログに記録されないことです。発生;だから私は自分で何が起こっているのかを間接的な証拠から差し引くことにしました。