[#IDEA-17064] IDEA does not handle <optional> dependency tag

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IDEA does not handle <optional> dependency tag

Created: 05 Feb 08 08:03 Updated: 11 Apr 08 15:08

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Maven Integration

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This issue duplicates:
	IDEA-17666 Maven dependencies scope not working ...

Build:	7,590
Severity:	High

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in the pom file of a project you can mark a dependency as optional by using tag <optional>true</optional>. This in combination with a <scope>compile</scope> means that the dependency is NOT transitive.
The problem is that IDEA does not take in count this when computing the dependency and adds the dependency marked as optional to the list of available jars in the classpath and so a class could compile in idea but not when doing the maven build.

More, while using Maven to build osgi artifacts this option is used quite heavily.

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Anton Makeev - 05 Feb 08 17:10

What is the problem this case causes?
Could you please give some concrete example?

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Alin Dreghiciu - 06 Feb 08 08:58

A simple example:
1. I have project A that has a dependency on project B
2. The dependency on project B is marked as optional with <optional>true</optional> and <scope>compile</compile> => B is not transitive in Maven terms
3. I have a project C that depends on project B
4. Now, if I'm in IDEA project B will be added to the list of modules libraries. This means that I can use anything within project B and that will compile within IDEA. But, if I run a maven build I will get an ClassNotFoundException as maven it will not add project B to classpath as project B is not considered transitive by Maven.

For use cases of such usage you may take a look at http://maven.apache.org/guides/introduction/introduction-to-optional-and-excludes-dependencies.html.

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Anton Makeev - 07 Feb 08 16:07

I'm afraid IDEA does not support optional inter-module dipendencies. The classpath is build transitively irrelatively the export flag.
We will handle the <optional> tag and set the export flag accordingly. This functonality will be available in the fist 7.0.4 eap.

If you have some problem running your apps from IDEA, please elaborate the details.

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Anton Makeev - 11 Apr 08 15:08

IDEA-17666