lsif-java index reports an error but succeeds with exit code 0

[olafurpg]

Discovered while auto-indexing the sbt package repo

sbt.zip

unzip sbt.zip
lsif-java index
...
java.lang.RuntimeException: No SemanticDB files found. This typically means that `lsif-java` is unable to automatically index this codebase. If you are using Gradle or Maven, please report an issue to https://github.com/sourcegraph/lsif-java and include steps to reproduce. If you are using a different build tool, make sure that you have followed all of the steps from https://sourcegraph.github.io/lsif-java/docs/manual-configuration.html

[olafurpg]

Same error in other repo maven/org.jboss.xnio/xnio-api@3.8.4.Final

[94minfo�[39m: Compiling 221 Java sources
Downloading https://github.com/shyiko/jabba/raw/master/index.json
Downloaded https://github.com/shyiko/jabba/raw/master/index.json
Downloading https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u292-b10/OpenJDK8U-jdk_x64_linux_hotspot_8u292b10.tar.gz
Still downloading:
https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u292-b10/OpenJDK8U-jdk_x64_linux_hotspot_8u292b10.tar.gz (67.12 %, 69148083 / 103026380)
Downloaded https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u292-b10/OpenJDK8U-jdk_x64_linux_hotspot_8u292b10.tar.gz
Extracting
  /root/.cache/coursier/v1/https/github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u292-b10/OpenJDK8U-jdk_x64_linux_hotspot_8u292b10.tar.gz
in
  /root/.cache/coursier/jvm/adopt@1.8.0-292
Done
�[94minfo�[39m: $ /root/.cache/coursier/jvm/adopt@1.8.0-292/bin/javac @/data/target/javacopts.txt
�[94minfo�[39m: /tmp/lsif-java2085231075809640276/s/org/xnio/_private/Messages_$logger.java:54: error: duplicate class: org.xnio._private.Messages_$logger
�[94minfo�[39m: public class Messages_$logger extends DelegatingBasicLogger implements Messages, BasicLogger, Serializable {
�[94minfo�[39m:        ^
�[94minfo�[39m: /data/org/xnio/Xnio.java:43: error: package org.osgi.framework does not exist
�[94minfo�[39m: import org.osgi.framework.Bundle;
�[94minfo�[39m:                          ^
�[94minfo�[39m: /data/org/xnio/Xnio.java:44: error: package org.osgi.framework does not exist
�[94minfo�[39m: import org.osgi.framework.BundleContext;
�[94minfo�[39m:                          ^
�[94minfo�[39m: /data/org/xnio/Xnio.java:45: error: package org.osgi.framework does not exist
�[94minfo�[39m: import org.osgi.framework.FrameworkUtil;
�[94minfo�[39m:                          ^
�[94minfo�[39m: /data/org/xnio/Xnio.java:46: error: package org.osgi.framework does not exist
�[94minfo�[39m: import org.osgi.framework.ServiceReference;
�[94minfo�[39m:                          ^
�[94minfo�[39m: 5 errors