java - 编译单元不在 Java 项目的构建路径上 - Maven

Question

今天我在我的 eclipse 中导入了一个 Maven 项目。当我尝试使用自动建议时，当我添加一些代码时，它提醒我“编译单元不在 Java 项目的构建路径上”。我看到这个问题的解决方法很少，但都没有解决。这个应该怎么办？

  <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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>

<parent>
    <groupId>com.core.extension</groupId>
    <artifactId>Softpro</artifactId>
    <version>1.0.0-SNAPSHOT</version>
</parent>

<artifactId>cu-softpro-connector</artifactId>
<name>jar :: cu-softpro-connector</name>
<packaging>jar</packaging>

<dependencies>
    <dependency>
        <groupId>com.core.extension</groupId>
        <artifactId>cu-softpro-client</artifactId>
    </dependency>
    <dependency>
        <groupId>com.core.framework</groupId>
        <artifactId>cu-svcframework-ejb</artifactId>
        <type>ejb</type>
    </dependency>
    <dependency>
        <groupId>com.core.framework</groupId>
        <artifactId>cu-shared</artifactId>
    </dependency>
    <dependency>
        <groupId>com.core.base</groupId>
        <artifactId>cu-common-entity</artifactId>
    </dependency>
    <dependency>
        <groupId>com.core.base</groupId>
        <artifactId>cu-services-base</artifactId>
        <exclusions>
            <exclusion>
                <groupId>com.core.framework</groupId>
                <artifactId>cu-subsystems</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>com.core.base</groupId>
        <artifactId>cu-platform-model</artifactId>
    </dependency>
    <dependency>
        <groupId>com.core.extension</groupId>
        <artifactId>cu-forms-connector</artifactId>
    </dependency>
    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-api</artifactId>
    </dependency>
    <dependency>
        <groupId>commons-logging</groupId>
        <artifactId>commons-logging</artifactId>
    </dependency>
    <dependency>
        <groupId>commons-lang</groupId>
        <artifactId>commons-lang</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.cxf</groupId>
        <artifactId>cxf-rt-core</artifactId>
    </dependency>
</dependencies>
</project>

Answer 1

我在导入时遇到了与 maven 项目相同的问题。

根本原因:

我通过按 Ctrl+Shift+R 搜索文件并在 Parent -> Sub-module -> FileName.java 路径上打开文件。所以按下 Ctrl+Space 时出现错误 The compilation unit is not on the build path of a Java project - Maven

解决方案:

我们需要确保我们在子模块路径上打开文件，并且构建路径应该配置为项目中安装的正确 jdk。

希望这对您有所帮助。