fancyplants fancyplants - 4 months ago 41
Java Question

'dependencies.dependency.version' is missing error, but version is managed in parent

I have a maven project that contains several modules. In Eclipse (Juno, with m2e) it seems to compile fine. But when I do a maven install on one of the modules, the build fails immediately.

Parent pom:

<groupId>com.sw.system4</groupId>
<artifactId>system4-parent</artifactId>
<version>${system4.version}</version>
<packaging>pom</packaging>
<name>System 4 Parent Project</name>
<modules>
<module>system4-data</module>
...others...
</modules>
<properties>
<system4.version>0.0.1-SNAPSHOT</system4.version>
<spring.version>3.2.3.RELEASE</spring.version>
... others...
</properties>

<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
<scope>runtime</scope>
</dependency>
... lots of others ...
</dependencies>
</dependencyManagement>


Child pom:

<parent>
<groupId>com.sw.system4</groupId>
<artifactId>system4-parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>system4-data</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<scope>runtime</scope>
</dependency>
... lots of others...
</dependencies>


When I build, I get the following output:

[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project com.sw.system4:system4-data:0.0.1-SNAPSHOT (C:\work\eclips
e_workspaces\systemiv\system4-parent\system4-data\pom.xml) has 8 errors

[ERROR] 'dependencies.dependency.version' for org.springframework:spring-cor
e:jar is missing. @ line 16, column 16

... others omitted for clarity ...


I dont understand why it doesn't even attempt to compile. Ive tried removing the runtime scope from parent and child, and it makes no difference. Please help!

Answer

A couple things I think you could try:

  1. Put the literal value of the version in the child pom

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>3.2.3.RELEASE</version>
      <scope>runtime</scope>
    </dependency>
    
  2. Clear your .m2 cache normally located C:\Users\user.m2\repository. I would say I do this pretty frequently when I'm working in maven. Especially before committing so that I can be more confident CI will run. You don't have to nuke the folder every time, sometimes just your project packages and the .cache folder are enough.

  3. Add a relativePath tag to your parent pom declaration

    <parent>
      <groupId>com.mycompany.app</groupId>
      <artifactId>my-app</artifactId>
      <version>1</version>
     <relativePath>../parent/pom.xml</relativePath>
    </parent>
    

It looks like you have 8 total errors in your poms. I would try to get some basic compilation running before adding the parent pom and properties.