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JDTLS spawns separate process per module in Java Maven multi-module projects #28760
Description
Description
In a Maven multi-module project (parent pom.xml with <modules>), JDTLS spawns a separate process for each submodule instead of sharing a single instance at the topmost parent pom.xml.
For example, with this structure:
project-root/
pom.xml (parent, declares <modules>)
module-a/pom.xml (child module)
module-b/pom.xml (child module)
Opening Java files in module-a and module-b each starts a separate JDTLS process. Each JDTLS instance uses ~1GB, so a project with 5+ modules easily consumes 5GB+ of memory.
The existing fix (#14192) resolved this for Gradle monorepos by walking up to find settings.gradle. However, Maven multi-module projects were not addressed — the root detection still falls back to the nearest pom.xml for Maven projects.
Steps to reproduce
- Create a Maven multi-module project with a parent pom.xml and 3+ child modules
- Open Java files from different modules in opencode
- Observe multiple JDTLS processes via
ps aux | grep jdtls
Operating System
macOS 26.4 (aarch64)
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github-actions commentedon May 22, 2026
This issue might be a duplicate of (or closely related to) an existing issue. Please check:
[-]JDTLS spawns separate process per module in Maven multi-module projects[/-][+]JDTLS spawns separate process per module in Java Maven multi-module projects[/+]areyouok commentedon May 23, 2026
#11368 is not exactly the same as this issue. It's already closed, but the Java Maven multi-module scenario was not fixed. opencode spawns numerous JDTLS processes, making LSP nearly unusable for Java projects. The PR I submitted fixes this issue.
scrumpypoker commentedon Jun 7, 2026
Confirmed, the Maven multi-module issue is still there. This screenshot can help you realise what the multi-module Maven situation with OpenCode is :-) Fixing this issue will really help a lot with development process for more complex repositories and will free gigabytes of RAM.
areyouok commentedon Jun 8, 2026
@scrumpypoker You can use my PR and build it yourself. I’ve been using it for days.