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java - 不兼容的类型 : java. util.Optional 无法转换为Users(Springboot编译错误)

转载 作者:行者123 更新时间:2023-12-02 13:36:04 24 4
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我在 spring-boot 应用程序的以下行收到不兼容类型的错误消息:

RequestDO request = requestRepository.findOne(requestModel.getRequestId());
Users employee = usersRepository.findOne(request.getUsers().getId());

我以前没有在这种情况下遇到过这个错误。我的应用程序自大约一个月前首次构建以来一直成功运行。

构建失败:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project tmt: Compilation failure: Compilation failure:
[ERROR] /C:/Users/martin/Documents/Web Projects/home.office/src/main/java/xyz/app/controller/UserController.java:[45,45] incompatible types: java.util.Optional<xyz.app.entity.Users> cannot be converted to xyz.app.entity.Users
[ERROR] /C:/Users/martin/Documents/Web Projects/home.office/src/main/java/xyz/app/controller/RequestController.java:[139,54] incompatible types: java.util.Optional<xyz.app.entity.RequestDO> cannot be converted to xyz.app.entity.RequestDO
[ERROR] /C:/Users/martin/Documents/Web Projects/home.office/src/main/java/xyz/app/controller/RequestController.java:[140,49] incompatible types: java.util.app<xyz.app.entity.Users> cannot be converted to xyz.app.entity.Users
[ERROR] /C:/Users/martin/Documents/Web Projects/home.office/src/main/java/xyz/app/controller/RequestController.java:[155,54] incompatible types: java.util.Optional<v.app.entity.RequestDO> cannot be converted to xyz.app.entity.RequestDO
[ERROR] /C:/Users/martin/Documents/Web Projects/home.office/src/main/java/xyz/app/controller/RequestController.java:[157,49] incompatible types: java.util.Optional<xyz.app.entity.Users> cannot be converted to xyz.app.entity.Users

自从我上次成功重建我的项目以来,我没有对代码进行任何更改。这让我相信 springframework Maven 依赖项最近发生了变化,导致我的代码被破坏。是否可以通过恢复到我的 pom.xml 中的旧快照来测试这一点?另外,什么可能导致错误?

pom

<?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>xyz.app</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>

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

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.BUILD-SNAPSHOT</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-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</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-validation</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>sqljdbc4</artifactId>
<version>4.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!--<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc7</artifactId>
<version>12.1.0.1</version>
</dependency>-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-ldap</artifactId>
</dependency>
<dependency>
<groupId>org.apache.directory.server</groupId>
<artifactId>apacheds-server-jndi</artifactId>
<version>1.5.5</version>
</dependency>
<dependency>
<groupId>it.ozimov</groupId>
<artifactId>spring-boot-email-core</artifactId>
<version>0.4.0</version>
</dependency>
<dependency>
<groupId>it.ozimov</groupId>
<artifactId>spring-boot-freemarker-email</artifactId>
<version>0.4.0</version>
</dependency>
<dependency>
<groupId>org.thymeleaf.extras</groupId>
<artifactId>thymeleaf-extras-springsecurity4</artifactId>
</dependency>
</dependencies>

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

<repositories>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
<pluginRepository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>

</project>

最佳答案

我在使用 2.0.0.BUILD-SNAPSHOT 时遇到了类似的问题,因此除非您正在尝试一些低级 Spring Boot 功能,否则请将版本更改为 1.5.2.RELEASE

关于java - 不兼容的类型 : java. util.Optional<xyz.app.entity.Users> 无法转换为Users(Springboot编译错误),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42997655/

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