kressi opened a new issue, #12912:
URL: https://github.com/apache/maven/issues/12912
### Affected version
4.0.0-rc-6
### Bug description
## Summary
`mvn --version` hangs indefinitely with Maven `4.0.0-rc-6` under JDK 25 in a
Linux container environment.
The same command works with Maven `4.0.0-rc-5`under the same conditions.
This appears to be a regression in `rc-6`.
## Environment
- OS: Linux (container)
- Container image: `openjdk-25-jdk-bullseye`
- Java: OpenJDK 25 (`25+35-3488`)
- Maven versions compared:
- `4.0.0-rc-5` (works)
- `4.0.0-rc-6` (hangs)
## Regression statement
Under the sam eruntime and command line:
- `apache-maven-4.0.0-rc-5/bin/mvn --batch-mode --errors --show-warnings
--version` exits successfully
- `apache-maven-4.0.0-rc-6/bin/mvn --batch-mode --errors --show-warnings
--version` hangs and must be killed
## Reproduction (self-contained, JDK-only)
This script below avoids external package installs and uses only JDK tools
available in the image.
```bash
docker run --rm -it openjdk:25-jdk-bullseye bash -lc '
docker run --rm -it openjdk:25-ea-jdk-bullseye bash -lc '
set -euo pipefail
mkdir -p /tmp/mvncmp
cd /tmp/mvncmp
cat <<"EOF" > Downloader.java
import java.io.InputStream;
import java.net.URI;
import java.nio.file.*;
public class Downloader {
public static void main(String[] args) throws Exception {
try (InputStream in = URI.create(args[0]).toURL().openStream()) {
Files.copy(in, Paths.get(args[1]),
StandardCopyOption.REPLACE_EXISTING);
}
}
}
EOF
for v in 4.0.0-rc-5 4.0.0-rc-6; do
url="https://archive.apache.org/dist/maven/maven-4/${v}/binaries/apache-maven-${v}-bin.zip";
zip="apache-maven-${v}-bin.zip"
dir="apache-maven-${v}"
echo "Downloading ${url}"
/usr/local/openjdk-25/bin/java Downloader.java "${url}" "${zip}"
mkdir -p "${dir}"
(cd "${dir}" && /usr/local/openjdk-25/bin/jar xf "../${zip}")
mv "${dir}/apache-maven-${v}"/* "${dir}"
rmdir "${dir}/apache-maven-${v}"
chmod +x "${dir}/bin/mvn"
echo "== ${v} =="
timeout -k 5s 40s "${dir}/bin/mvn" --batch-mode --errors --show-version
--version
echo "rc=$?"
done
'
```
## Expected result
Both versions print Maven version and exit with code `0`.
## Actual result
- `rc-5`: exits with `0`
- `rc-6`: hangs; `timeout` kills process (`rc=124` from timeout wrapper,
process termination observed)
## Thread dump evidence from rc-6
While hung, `jcmd <pid> Thread.print -l` shows:
- `main` thread waiting in `CompleteableFuture.get()` from
org.apache.maven.jline.FastTerminal.getTerminal`
- a separate `fast-terminal-thread` also waiting in the same path
- stack includes Jline FFM terminal provider intitialization
(`org.jline.terminal.impl.ffm.CLibrary`)
Relevant frames:
```text
"main" ... WAITING (parking)
at java.util.concurrent.CompletableFuture.get
at org.apache.jline.FastTerminal.getTerminal(FastTerminall.java:68)
at org.apache.jline.FastTerminal.getType(FastTerminal.java:201)
at org.apache.slf4j.MavenSimpleLogger.configure(...)
at org.apache.cling.invoker.LookupInvoker.activeLogging(...)
"fast-terminal-thread" ... WAITING (parking)
at java.util.concurrent.CompletableFuture.get
at org.apache.maven.jline.FastTerminal.getTerminal(FastTerminal.java:68)
...
at org.jline.terminal.impl.ffm.CLibrary.<clinit>(CLibrary.java:369)
```
Also seen during startup:
```text
WARNING: Unable to find openpty native method in static libraries and unable
to load the util library.
- java.long.UnsatisfiedLinkError: no util in java.library.path: ...
```
## Suspected cause
A startup hang/regression in Maven `4.0.0-rc-6` involving JLine terminal
initialization (FFM path) and logging initialization.
The issue does not reproduce in `4.0.0-rc-5` with the same JDK and container.
## Workarounds
Any of the following avoids the hang for `rc-6` in this environment:
- `MAVEN_OPTS="-Dorg.jline.terminal.ffm=false"`
- `MAVEN_OPTS="-Dorg.jline.terminal.ffm=false -Dorg.jline.terminal.jni=true"`
- `MAVEN_OPTS="-Dorg.jline.terminal.providers=jni,exec
-Dorg.jline.terminal.ffm=false"`
## Notes
- This is reproducible with `mvn --version` only (no project build required).
- Network/download issues were ruled out.
- Wrapper script is not required to reproduce; direct Maven binary
invocation shows the same behavior for `rc-6`.
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