Java Eclipse 显示“Maven 配置问题：未知”

Question

提问by R?mulo Sorato

I just imported a spingboot project that I created in https://start.spring.io/in eclipse. I tried to import two times, but the problem persists. Already tried to do a mvn update , a mvn clean install, tried to clean the project but none of this worked. Its a problem in the first line of pom xml file. I dont have any idea how to solve this. I'm using java 11

我刚刚在 eclipse 中导入了我在https://start.spring.io/中创建的 spingboot 项目。我尝试导入两次，但问题仍然存在。已经尝试进行 mvn update ， mvn 全新安装，尝试清理项目，但这些都不起作用。这是 pom xml 文件第一行的问题。我不知道如何解决这个问题。我正在使用 Java 11

error

This is the complete POM file:

这是完整的 POM 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>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.5.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.in28minutes.springboot.rest.example</groupId>
<artifactId>spring-boot-2-jpa-with-hibernate-and-h2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-boot-2-jpa-with-hibernate-and-h2</name>
<description>Demo project for Spring Boot</description>

<properties>
    <java.version>11</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>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </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>

Answer 1

采纳答案by gybandi

This seems like a bug in eclipse: https://bugs.eclipse.org/bugs/show_bug.cgi?id=547340

这似乎是 Eclipse 中的一个错误：https: //bugs.eclipse.org/bugs/show_bug.cgi?id=547340

You can fix this by temporary downgrading the maven jar plugin version to 3.1.1 from 3.1.2. Add this to the propertiessection:

您可以通过将 Maven jar 插件版本从 3.1.2 临时降级到 3.1.1 来解决此问题。将此添加到属性部分：

<maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>

So your pom will look like this:

所以你的 pom 看起来像这样：

<?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>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.5.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.in28minutes.springboot.rest.example</groupId>
<artifactId>spring-boot-2-jpa-with-hibernate-and-h2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-boot-2-jpa-with-hibernate-and-h2</name>
<description>Demo project for Spring Boot</description>

<properties>
    <java.version>11</java.version>
    <maven-jar-plugin.version>3.1.1</maven-jar-plugin.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>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </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>

Update:A fix has been released. Click Help > Check for updates in Eclipse/STS and install the newest m2e connector.

更新：已发布修复程序。单击帮助 > 检查 Eclipse/STS 中的更新并安装最新的 m2e 连接器。

Answer 2

回答by Patel Romil

Step 1:

第1步：

Downgrade to <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>

降级到 <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>

<properties>
    <java.version>X</java.version>
    <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
</properties>

Step 2Update Project

步骤 2更新项目

Right Click on your Project
Go to Maven
Click on Update Project
Clean and Re-Run your Application

右键单击您的项目
前往 Maven
点击更新项目
清理并重新运行您的应用程序

Answer 3

回答by G.A.

Was Getting exact same error. Solution by Gybandi kinda worked for me.

得到完全相同的错误。Gybandi 的解决方案对我有用。

Updating project in Maven> menu does nothing to make error icon go away.
Did the 3.1.1 and then did a maven -> update project from context menu. The red (x) icon is now GONE:-). But I really don't want to downgrade my maven plugin, if possible.
The suggestion of updating m2e-connector from eclipse marketplace does not work. All I see against the m2e-connector entry is a "learn more" link which takes me to its webpage. Nothing like "upgrade/update" button present.

在 Maven> 菜单中更新项目不会使错误图标消失。
做了 3.1.1，然后做了一个 maven -> 从上下文菜单更新项目。红色 (x) 图标现在消失了:-)。但如果可能的话，我真的不想降级我的 Maven 插件。
从 eclipse 市场更新 m2e-connector 的建议不起作用。我在 m2e-connector 条目中看到的只是一个“了解更多”链接，它将我带到它的网页。没有像“升级/更新”按钮那样的东西。

Answer 4

回答by Tanmay Naik

<maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>

Add this dependency in pom.xml under properties tag

在属性标签下的 pom.xml 中添加此依赖项

Answer 5

回答by Khaled Jamal

if you are using spring boot downgrade the version to 2.1.4.RELEASEinstead of 2.1.5.RELEASEit will solve the problem

如果您使用 spring boot 将版本降级为2.1.4.RELEASE而不是2.1.5.RELEASE它将解决问题

Answer 6

回答by RArora

I fixed this issue by changing the version from 2.1.6 to 2.1.3

我通过将版本从 2.1.6 更改为 2.1.3 来解决此问题

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>

I changed this to 2.1.3 because there were two versions were shown available in local m2 repository at below path

我将其更改为 2.1.3，因为在以下路径的本地 m2 存储库中显示了两个可用版本

.m2\repository\org\springframework\boot\spring-boot-starter-parent

Answer 7

回答by Ravikiran butti

I am using eclipse photon and had similar issue. Didnt want to add the maven-jar-plugin.version in my pom as I dont want my codebase to contain code specific to IDE.

我正在使用 eclipse photon 并且遇到了类似的问题。不想在我的 pom 中添加 maven-jar-plugin.version，因为我不希望我的代码库包含特定于 IDE 的代码。

What I noticed is eclipse photon has m2e version of 1.5 which is causing the problem. I uninstall all the m2e connectors, restarted my eclipse and then installed the m2e connector using the below url manually

我注意到 eclipse photon 的 m2e 版本为 1.5，这导致了问题。我卸载了所有的 m2e 连接器，重新启动了我的 eclipse，然后使用下面的 url 手动安装了 m2e 连接器

https://download.eclipse.org/technology/m2e/releases/1.13/

this worked like a charm

这就像一个魅力

Answer 8

回答by Rohan Patil

Adding packaging tag solved my problem. Didn't need to lower maven-jar plugin version.

添加包装标签解决了我的问题。不需要降低 maven-jar 插件版本。

<modelVersion>4.0.0</modelVersion>
<packaging>war</packaging>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.2.RELEASE</version>
    <relativePath/>
</parent>

Answer 9

回答by Avinash Khadsan

For spring boot project I have added this:

对于 spring boot 项目，我添加了这个：

<properties>
            <java.version>1.8</java.version>
            <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
        </properties>

Java Eclipse 显示“Maven 配置问题：未知”

提问by R?mulo Sorato

采纳答案by gybandi

回答by Patel Romil

回答by G.A.

回答by Tanmay Naik

回答by Khaled Jamal

回答by RArora

回答by Ravikiran butti

回答by Rohan Patil

回答by Avinash Khadsan

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标签

Java Eclipse 显示“Maven 配置问题：未知”

提问by R?mulo Sorato

采纳答案by gybandi

回答by Patel Romil

回答by G.A.

回答by Tanmay Naik

回答by Khaled Jamal

回答by RArora

回答by Ravikiran butti

回答by Rohan Patil

回答by Avinash Khadsan

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