After upgrading Jupyter Lab, I was editing Java files before compiling them with Maven. To my surprise, I started getting error messages like:
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project foo: Compilation failure: Compilation failure:
[ERROR] /build/src/main/java/foo/bar/.ipynb_checkpoints/Foo-checkpoint.java:[36,8] class Foo is public, should be declared in a file named Foo.java
[ERROR] /build/src/main/java/foo/bar/Foo.java:[36,8] duplicate class: foo.bar.Foo
This happened because Jupyter Lab is auto-saving files (nice!) and Maven is attempting to compile them (not nice). After much digging around and experimentation, I added the following to my pom.xml file as a child of the project element:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<excludes>
<exclude>**/.ipynb_checkpoints/**</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>