java - Thymeleaf 无法识别 HomeController 中的变量和创建 bean“homeController”时的 Java 错误
问题描述
我已经调试这个网络应用程序 2 个小时了，但我无法弄清楚。
在应用程序中放置版本变量后，删除 temp H2 DB 和 data.sql 文件，然后将驱动程序添加到 pom.xml 文件以使用 Postgres DB，它停止工作。
我附上了所有必要的文件，但如果您需要一些东西，请发表评论。
在application.properties我给出了变量version然后在HomeController（第 24 行）中使用了该变量，相应的控制台错误显示“无法解析占位符'版本'。”
通常在浏览器中，有我可以挖掘的错误消息，但是这次本地主机上的浏览器根本无法加载，This site can’t be reached, localhost refused to connect.
下面的控制台日志中只有两个“由”错误，所以我相信指出这个错误并不难。
在对 StackOverflow 进行大量研究、查看其他问题以及反复试验之后，我已经用完了适用于我的案例的可能解决方案。如果有人能查看随附的代码并让我知道任何解决方案，我将不胜感激。任何帮助表示赞赏！非常感谢您，我会回来查看。
这是文件结构，如果有帮助的话
这是第二部分：
spring.datasource.username=postgres日食中以及version=3.0.0底部的黄色下划线，当我将鼠标悬停在黄线上时，它在两者上都显示“未知属性” 。
这是我的 application.properties 文件和屏幕截图：
spring.datasource.url=jdbc:postgresql://localhost:5432/pma-database
spring.datasource.username=postgres
spring.datasource.password=password321
spring.datasource.initialization-mode=never
spring.jpa.hibernate.ddl-auto=none
spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
spring.jpa.show-sql=true
spring.thymeleaf.cache=false
version=3.0.0
这是 HomeController.java，您会看到 @Value("${version}") 在第 24 行左右，而 model.addAttribute("versionNumber", ver) 在第 36 行。
package com.project1.controllers;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.project1.dao.EmployeeRepository;
import com.project1.dao.ProjectRepository;
import com.project1.dto.ChartData;
import com.project1.dto.EmployeeProject;
import com.project1.entities.Project;
@Controller
public class HomeController {
@Value("${version}")
private String ver;
@Autowired
ProjectRepository proRepo;
@Autowired
EmployeeRepository empRepo;
@GetMapping("/")
public String displayHome(Model model) throws JsonProcessingException {
model.addAttribute("versionNumber", ver);
Map<String, Object> map = new HashMap<>();
//we are querying the DB for projects
List<Project> projects = proRepo.findAll();
model.addAttribute("projectsList", projects);
List<ChartData> projectData = proRepo.getProjectStatus();
ObjectMapper objectMapper = new ObjectMapper();
String jsonString = objectMapper.writeValueAsString(projectData);
//[ ["NOTSTARTED, 1], ["INPROGRESS", 2], ["COMPLETED", 1] ]
model.addAttribute("projectStatusCnt", jsonString);
//we are querying the DB for employees
List<EmployeeProject> employeesProjectCnt = empRepo.employeeProjects();
model.addAttribute("employeesListProjectsCnt", employeesProjectCnt);
return "main/home";
}
}
这是标签中包含变量的home.html文件versionNumber，它与手头的问题有关。
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<!-- this is the code for the header-->
<head th:replace="layouts::header"></head>
<!-- this is the code for the navbar-->
<nav th:replace="layouts::navbar"></nav>
<body>
<div class="container">
<h3>Main Dashboard</h3>
<a th:text="${versionNumber}"></a>
<hr>
<h4> Current Projects </h4>
<div class="row">
<div class="col-md-6">
<table class="table table-bordered table-striped">
<thead class="thead-dark">
<tr>
<th> Project Name </th>
<th> Project Stage </th>
</tr>
</thead>
<tbody>
<tr th:each="aProject : ${projectsList}">
<td th:text="${aProject.name}"></td>
<td th:text="${aProject.stage}"></td>
</tr>
</tbody>
</table>
</div>
<div class="col-md-4">
<canvas id="myPieChart" height="50" width="50"></canvas>
<script>
var chartData = "[[${projectStatusCnt}]]"
</script>
</div>
</div>
</div>
<div class="container">
<h4> Current Employees </h4>
<div class="row">
<div class="col-md-6">
<table class="table table-bordered table-striped">
<thead class="thead-dark">
<tr>
<th> First Name </th>
<th> Last Name </th>
<th> Project Count</th>
</tr>
</thead>
<tbody>
<tr th:each="aEmployeeProjectCnt : ${employeesListProjectsCnt}">
<td th:text="${aEmployeeProjectCnt.firstName}"></td>
<td th:text="${aEmployeeProjectCnt.lastName}"></td>
<td th:text="${aEmployeeProjectCnt.projectCount}"></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<script type="text/javascript" th:src="@{js/myChart.js}"></script>
</body>
</html>
这是Employee具有GenerationStrategy. 我尝试了GenerationTypes列出的两个，但它们在控制台日志中给出了相同的错误。
@Id annotation
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="employee_seq")
再次尝试了下面的代码片段，但这给了我与下面附加的代码相同的错误，这些是来自 stackoverflow 的建议，但应用程序仍然无法工作。
@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="employee_seq")
@SequenceGenerator(allocationSize=1, name = "employee_generator")
这是Employee课程
package com.project1.entities;
import java.util.List;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.SequenceGenerator;
@Entity
public class Employee {
@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="employee_seq")
@SequenceGenerator(allocationSize=1, name = "employee_generator")
private long employeeId;
private String firstName;
private String lastName;
private String email;
@ManyToMany(cascade = {CascadeType.DETACH, CascadeType.MERGE, CascadeType.REFRESH, CascadeType.PERSIST},
fetch = FetchType.LAZY)
@JoinTable(name="project_employee",
joinColumns=@JoinColumn(name="employee_id"),
inverseJoinColumns=@JoinColumn(name="project_id")
)
private List<Project> projects;
public Employee() {
}
public Employee(String firstName, String lastName, String email) {
super();
this.firstName = firstName;
this.lastName = lastName;
this.email = email;
}
public List<Project> getProjects() {
return projects;
}
public void setProjects(List<Project> projects) {
this.projects = projects;
}
public long getEmployeeId() {
return employeeId;
}
public void setEmployeeId(long employeeId) {
this.employeeId = employeeId;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}
Project课堂上也一样
package com.project1.entities;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.SequenceGenerator;
@Entity
public class Project {
@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="project_seq")
@SequenceGenerator(allocationSize=1, name = "project_generator")
private long projectId;
private String name;
private String stage; // NOTSTARTED, COMPLETED, INPROGRESS
private String description;
@ManyToMany(cascade = {CascadeType.DETACH, CascadeType.MERGE, CascadeType.REFRESH, CascadeType.PERSIST},
fetch = FetchType.LAZY)
@JoinTable(name="project_employee",
joinColumns=@JoinColumn(name="project_id"),
inverseJoinColumns=@JoinColumn(name="employee_id")
)
private List<Employee> employees;
public Project() {
}
public Project(String name, String stage, String description) {
super();
this.name = name;
this.stage = stage;
this.description = description;
}
public List<Employee> getEmployees() {
return employees;
}
public void setEmployees(List<Employee> employees) {
this.employees = employees;
}
public long getProjectId() {
return projectId;
}
public void setProjectId(long projectId) {
this.projectId = projectId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getStage() {
return stage;
}
public void setStage(String stage) {
this.stage = stage;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
//convenience method
public void addEmployee(Employee emp) {
if(employees == null) {
employees = new ArrayList<>();
}
employees.add(emp);
}
}
这是错误消息：
Java HotSpot(TM) 64-Bit Server VM warning: Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.
{spring.web.resources.chain.cache=false, spring.web.resources.cache.period=0}
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.4.0)
2020-12-06 19:57:50.893 INFO 8560 --- [ restartedMain] com.project1.PmaApplication : Starting PmaApplication using Java 14.0.2 on DESKTOP-C26F0I7 with PID 8560 (C:\Users\kashi\git\PMA-Application\PMA-Application\target\classes started by kashi in C:\Users\kashi\git\PMA-Application\PMA-Application)
2020-12-06 19:57:50.897 INFO 8560 --- [ restartedMain] com.project1.PmaApplication : No active profile set, falling back to default profiles: default
2020-12-06 19:57:50.975 INFO 8560 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2020-12-06 19:57:50.975 INFO 8560 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2020-12-06 19:57:51.832 INFO 8560 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFERRED mode.
2020-12-06 19:57:51.902 INFO 8560 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 59 ms. Found 2 JPA repository interfaces.
2020-12-06 19:57:52.673 INFO 8560 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-12-06 19:57:52.682 INFO 8560 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-12-06 19:57:52.683 INFO 8560 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.39]
2020-12-06 19:57:52.779 INFO 8560 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-12-06 19:57:52.779 INFO 8560 --- [ restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1803 ms
2020-12-06 19:57:52.843 INFO 8560 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2020-12-06 19:57:52.977 INFO 8560 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2020-12-06 19:57:53.025 INFO 8560 --- [ restartedMain] o.s.b.a.h2.H2ConsoleAutoConfiguration : H2 console available at '/h2-console'. Database available at 'jdbc:h2:mem:c7335b0f-bd3a-43dd-9628-9ea69397c416'
2020-12-06 19:57:53.116 INFO 8560 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2020-12-06 19:57:53.268 INFO 8560 --- [ restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-12-06 19:57:53.381 INFO 8560 --- [ task-1] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [name: default]
2020-12-06 19:57:53.397 WARN 8560 --- [ restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'homeController': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'version' in value "${version}"
2020-12-06 19:57:53.397 INFO 8560 --- [ restartedMain] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2020-12-06 19:57:53.460 INFO 8560 --- [ task-1] org.hibernate.Version : HHH000412: Hibernate ORM core version 5.4.23.Final
2020-12-06 19:57:53.619 INFO 8560 --- [ task-1] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.1.2.Final}
2020-12-06 19:57:53.752 INFO 8560 --- [ task-1] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect
2020-12-06 19:57:54.169 WARN 8560 --- [ restartedMain] o.s.b.f.support.DisposableBeanAdapter : Invocation of destroy method failed on bean with name 'entityManagerFactory': javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.MappingException: Could not instantiate id generator [entity-name=com.project1.entities.Project]
2020-12-06 19:57:54.169 INFO 8560 --- [ restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'
2020-12-06 19:57:54.389 WARN 8560 --- [ restartedMain] o.s.b.f.support.DisposableBeanAdapter : Invocation of destroy method failed on bean with name 'inMemoryDatabaseShutdownExecutor': org.h2.jdbc.JdbcSQLNonTransientConnectionException: Database is already closed (to disable automatic closing at VM shutdown, add ";DB_CLOSE_ON_EXIT=FALSE" to the db URL) [90121-200]
2020-12-06 19:57:54.392 INFO 8560 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2020-12-06 19:57:54.400 INFO 8560 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
2020-12-06 19:57:54.405 INFO 8560 --- [ restartedMain] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2020-12-06 19:57:54.439 INFO 8560 --- [ restartedMain] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-12-06 19:57:54.489 ERROR 8560 --- [ restartedMain] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'homeController': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'version' in value "${version}"
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:405) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1415) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:608) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:531) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:925) ~[spring-context-5.3.1.jar:5.3.1]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:588) ~[spring-context-5.3.1.jar:5.3.1]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.0.jar:2.4.0]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767) ~[spring-boot-2.4.0.jar:2.4.0]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) ~[spring-boot-2.4.0.jar:2.4.0]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) ~[spring-boot-2.4.0.jar:2.4.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) ~[spring-boot-2.4.0.jar:2.4.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1309) ~[spring-boot-2.4.0.jar:2.4.0]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1298) ~[spring-boot-2.4.0.jar:2.4.0]
at com.project1.PmaApplication.main(PmaApplication.java:12) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.4.0.jar:2.4.0]
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'version' in value "${version}"
at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:178) ~[spring-core-5.3.1.jar:5.3.1]
at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) ~[spring-core-5.3.1.jar:5.3.1]
at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:239) ~[spring-core-5.3.1.jar:5.3.1]
at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[spring-core-5.3.1.jar:5.3.1]
at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175) ~[spring-context-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:931) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1308) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1287) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.1.jar:5.3.1]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.1.jar:5.3.1]
... 23 common frames omitted
文件中模型版本正下方的父标签带有pom.xml红色下划线，当我将鼠标悬停在它上面时，它会显示这一点。
Execution default-resources of goal org.apache.maven.plugins:maven-resources-plugin:3.2.0:resources failed: newPosition < 0: (-1 < 0) (org.apache.maven.plugins:maven-resources-plugin:3.2.0:resources:default-resources:process-resources)
org.apache.maven.plugin.PluginExecutionException: Execution default-resources of goal org.apache.maven.plugins:maven-resources-plugin:3.2.0:resources failed: newPosition < 0: (-1 < 0)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:148)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:332)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.lambda$8(MavenImpl.java:1379)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:179)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:114)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:1378)
at org.eclipse.m2e.core.project.configurator.MojoExecutionBuildParticipant.build(MojoExecutionBuildParticipant.java:54)
at org.eclipse.m2e.core.internal.builder.MavenBuilderImpl.build(MavenBuilderImpl.java:135)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$1.method(MavenBuilder.java:169)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$1.method(MavenBuilder.java:1)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod.lambda$1(MavenBuilder.java:114)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:179)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:114)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod.lambda$0(MavenBuilder.java:105)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:179)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:153)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:101)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod.execute(MavenBuilder.java:88)
at org.eclipse.m2e.core.internal.builder.MavenBuilder.build(MavenBuilder.java:197)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:832)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:220)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:263)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:316)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:319)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:371)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:392)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:154)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:244)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)
Caused by: java.lang.IllegalArgumentException: newPosition < 0: (-1 < 0)
at java.base/java.nio.Buffer.createPositionException(Buffer.java:334)
at java.base/java.nio.Buffer.position(Buffer.java:309)
at java.base/java.nio.ByteBuffer.position(ByteBuffer.java:1309)
at java.base/java.nio.ByteBuffer.position(ByteBuffer.java:266)
at org.apache.maven.shared.utils.io.FileUtils.copyFile(FileUtils.java:1946)
at org.apache.maven.shared.filtering.DefaultMavenFileFilter.copyFile(DefaultMavenFileFilter.java:98)
at org.apache.maven.shared.filtering.DefaultMavenResourcesFiltering.filterResources(DefaultMavenResourcesFiltering.java:262)
at org.apache.maven.plugins.resources.ResourcesMojo.execute(ResourcesMojo.java:356)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137)
... 30 more
这是 pom.xml 文件和模型版本正下方的标签
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.0</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.project1</groupId>
<artifactId>PMA-Application</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>PMA-Application</name>
<description>The PMA Web App</description>
<properties>
<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-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</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>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
解决方案
我遇到了同样的问题，希望我仍然可以帮助别人。
如果你使用 eclipse 去
文件 > 属性 > Java 构建路径 > 源
现在在“排除”的 src/main/resources 下，它对我说“**”，请确保删除此条目，使其显示为“（无）”。为我修好了。
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