Can you give them all a parent pom.xml and then mvn compile
the parent pom.xml?
Look for project inheritance here.
If you can specify relative paths, this shouldn't be too hard. Create a new maven project with a pom.xml something like:
<?xml version="1.0"?>
<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>
<groupId>com.example</groupId>
<artifactId>parent-app</artifactId>
<packaging>pom</packaging>
<version>1</version>
<modules>
<module>../project1</module>
<module>../project2</module>
</modules>
</project>
Delete the projects from your Eclipse workspace (but not the file system) and then import the parent maven project. Now you can:
Run As...
> Maven build
> clean compile
(as Goals)
and it should clean and compile all the projects.