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[Question] How to configure the Java binary path used by neotest-java #269
Description
How to set the java path? I already set my JAVA_HOME but it doesn't work (it still use default system path).
neotest-java: ...user/.local/share/nvim/lazy/nvim-nio/lua/nio/control.lua:145: The coroutine failed with this message:
...azy/neotest-java/lua/neotest-java/method_id_resolver.lua:28: Failed to execute javap to resolve method id. Exit code: 127. Stderr: bash: line 1: /usr/lib/jvm
/java-21-openjdk/bin/javap: No such file or directory
Activity
rcasia commentedon Mar 31, 2026
Hi @ardikars,
neotest-java does not use
JAVA_HOMEdirectly. Instead, it resolves thejava/javapbinaries by querying JDTLS (the Java language server) at runtime via thejava.project.getSettingsLSP command, specifically reading theorg.eclipse.jdt.ls.core.vm.locationsetting.So the binary path it uses is whatever JDK JDTLS has configured for your project, not your shell's
JAVA_HOME.The path in your error (
/usr/lib/jvm/java-21-openjdk/bin/javap) looks like it was reported correctly by JDTLS — the issue is that the binary doesn't exist at that path on your system. A few things to check:Is the JDK actually installed at that path? Run
ls /usr/lib/jvm/java-21-openjdk/bin/javapto verify. On some distros the package only installs the JRE (nojavap) — you may need the full JDK package (e.g.openjdk-21-jdkon Debian/Ubuntu).Is JDTLS pointing to the right JDK? You can override the JVM JDTLS uses for your project by setting
java.jdt.ls.java.homein your LSP config (e.g. vianvim-jdtls'ssettingstable). Make sure it points to a full JDK, not just a JRE.Verify what JDTLS reports by running this in Neovim while in your Java project:
If you share your JDTLS configuration I can help narrow it down further.
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