Maven本地存储库未使用最新依赖项更新

Question

My project has a pom.xml which I did deploy to a remote repository inside my company

<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>ProjectMav</groupId>
<artifactId>ProjectMav</artifactId>
<version>1.0</version>
<distributionManagement>
    <repository>
        <id>man-release</id>
        <name>mav release repo</name>
        <url>http://xxxxxx.net/repositories/mav-release/</url>
    </repository>
    <snapshotRepository>
        <id>mav-snapshots</id>
        <name>mav snapshots repo</name>
        <url>http://xxxxxx.net/repositories/mav-snapshots/</url>
    </snapshotRepository>
</distributionManagement>
<build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>
    </plugins>
</build>

After I do a 'mvn deploy' I did browse the remote repository and I see the project there

I have another project that is dependent on the above mentioned 'ProjectMav' and it's POM.xml is as follows

<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>mavtest</groupId>
<artifactId>mavtest-suite</artifactId>
<version>1.0</version>
<dependencies>
    <dependency>
        <groupId>ProjectMav</groupId>
        <artifactId>ProjectMav</artifactId>
        <version>1.0</version>
        <scope>compile</scope>
    </dependency>
</dependencies>
<repositories>
    <repository>
        <id>mav-release</id>
        <name>mav release repo</name>
        <url>http://xxxxxx.net/repositories/mav-release/</url>
    </repository>
</repositories>
<build>
    <testSourceDirectory>src/com/mav/</testSourceDirectory>
    <resources>
        <resource>
            <directory>/resources</directory>
            <excludes>
                <exclude>**/*.java</exclude>
            </excludes>
        </resource>
    </resources>
    <pluginManagement>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
        </plugins>
    </pluginManagement>
</build>

Now from eclipse if I do a Maven>update project it does not get the latest version of my 'ProjectMav' to my local repository.

But if I clear all the files in my local repo and do a maven update it gets my project

Any idea what's going on?

Answer 1

I believe the issue is that the maven eclipse plugin's update doesn't actually do a mvn install which is what you need if you want to override the 1.0 deployed version. The way the mvn eclipse plugin orders classpath dependencies (which you can clearly see in the package explorer is to put the dependency jars first and then the resolved upstream projects after the jars). This seems to work fine for SNAPSHOT projects as the plugin knows to use your project and not the jars but for release jars it gets confused (or at least I have noticed it to).

That being said you should avoid this issue altogether by changing the version of your local one to:

<version>1.1-SNAPSHOT</version>

Then in your downstream projects that depend on ProjectMav you update their dependencies to 1.1-SNAPSHOT . The management of versions can be tricky so you might want to look into the maven release plugin and have it deal with version-ing of your project when you deploy.