Eclipse（Photon）找不到我的Maven依赖罐

Question

I am trying to import a library from my maven repo. But I got the error saying "The import org cannot be resolved" , screenshot below:

However, we can see the jar under the Maven Dependencies from the Package explorer:

Also, my pom.xml looks like:

<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>Test1</groupId>
    <artifactId>Test1</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <build>
        <sourceDirectory>src</sourceDirectory>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.7.0</version>
                <configuration>
                    <release>10</release>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>org.webjars.npm</groupId>
            <artifactId>gregorian-calendar</artifactId>
            <version>4.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.8</version>
        </dependency>
    </dependencies>
</project>

What did I miss here? What else do I need to import org.apache.commons.lang3.time.DateUtils ? Thanks!

Note: I am on Mac

Answer 1

It looks like you have a module-info.java . In this case, you need to add requires org.apache.commons.lang3; to it (this is the automatic module name from the MANIFEST.MF inside commons-lang3-3.8.jar ).

Also, having MainTest1 in the default package is not allowed in a named module, so you have to move it into a package.

Alternatively, you can remove the module-info.java and things should mostly work like before Java 9