Skip to main content

IntelliJ IDEA Compiler Excludes issue with generated sources

I've recently got a fresh new licensed IntelliJ IDEA 12 and have been so glad about it until I've suddenly stumbled upon a strange issue. The Java project that was being developed successfully in previous versions of IDEA crashed during building this time. Shortly, the solution was hidden under IDEA Settings Compiler.Excludes where the JAXB generated sources directory was excluded due to some unknown reason. Below are the details and the screenshots.

Symptoms of issue
Here are the symptoms of the issue. Whenever the sources directory is excluded from compiling, it's marked with cross signs. See generated directory below:

This issue results in numerous "cannot find symbol" errors during compilation:

Settings Compiler.Excludes
Here is the screenshot with the solution for this issue. You just need to delete the item with excluded sources and they will again magically appear in the classpath.

Update - the root cause found
After a while I realized that the solution above didn't work anymore although it seemed to work in the beginning. So I had to dig further and found this thread about maven compiling with multiple source directories. The issue appeared to be related to maven-compiler-plugin that we used to specify generatedSourcesDirectory:
So removing the generatedSourcesDirectory property solved the issue - src/main/generated was no longer excluded from compilation on every update and reimport of maven project pom. However, it helped only when I created a new IntelliJ IDEA project from the project pom.xml and used build-helper-maven-plugin to mark generated as an additional sources directory:
Also I've created a ticket for IntelliJ IDEA developers as the odd behavior is obviously caused by some bug: IDEA-97975.


  1. Ivan,
    Are you sure, that adding src/main/generated with build-helper-maven-plugin works in IntelliJ? It does not work in IntelliJ 12.

    Best regards,

    1. Sergiy,

      It works fine for me, I'm using the latest version 12.1 atm. But it worked with older build of IntelliJ IDEA 12 as well. Did you try to remove IntelliJ IDEA project files (ipr, iml, iws, idea) and recreate the project using File -> Import Project? I mentioned this in the post as well. Before I did this trick, I also faced problems.


  2. Maven Projects -> Reimport should help as well.


Post a Comment

Popular posts from this blog

Connection to Amazon Neptune endpoint from EKS during development

This small article will describe how to connect to Amazon Neptune database endpoint from your PC during development. Amazon Neptune is a fully managed graph database service from Amazon. Due to security reasons direct connections to Neptune are not allowed, so it's impossible to attach a public IP address or load balancer to that service. Instead access is restricted to the same VPC where Neptune is set up, so applications should be deployed in the same VPC to be able to access the database. That's a great idea for Production however it makes it very difficult to develop, debug and test applications locally. The instructions below will help you to create a tunnel towards Neptune endpoint considering you use Amazon EKS - a managed Kubernetes service from Amazon. As a side note, if you don't use EKS, the same idea of creating a tunnel can be implemented using a Bastion server . In Kubernetes we'll create a dedicated proxying pod. Prerequisites. Setting up a tunnel.

DynamicReports and Spring MVC integration

This is a tutorial on how to exploit DynamicReports reporting library in an existing  Spring MVC based web application. It's a continuation to the previous post where DynamicReports has been chosen as the most appropriate solution to implement an export feature in a web application (for my specific use case). The complete code won't be provided here but only the essential code snippets together with usage remarks. Also I've widely used this tutorial that describes a similar problem for an alternative reporting library. So let's turn to the implementation description and start with a short plan of this how-to: Adding project dependencies. Implementing the Controller part of the MVC pattern. Modifying the View part of the MVC pattern. Modifying web.xml. Adding project dependencies I used to apply Maven Project Builder throughout my Java applications, thus the dependencies will be provided in the Maven format. Maven project pom.xml file: net.sourcefo

Cocoon authentication

This article will guide you through the steps showing how to use the Authentication Framework in a Cocoon 2.2 application. Maven dependencies. Spring configuration. Sitemap. Login page and controls. Maven dependencies You need the following dependency in your pom.xml : <dependency> <groupId>org.apache.cocoon</groupId> <artifactId>cocoon-auth-impl</artifactId> <version>1.0.0</version> </dependency> Spring configuration Authentication Framework has a flexible configuration based on a concepts of applications and security handlers . There can be several applications defined and running at the same that are simply independent security zones of your web application. The security details of an application are specified using a security handler. There are several implementations provided and you're free to implement your own. Here is the SimpleSecurityHandler used that takes the hardcoded credentials: <?xml versio