Java- Scala cross-compilation error - cannot find symbol
Symptoms
Running Clover with mixed Java-Scala project having cross-dependencies between Java and Scala classes, results in compiler complaining about missing Scala classes:
[ERROR] /project/target/clover/src-instrumented/test/java/HelloJavaWorld.java:3: error: package test.scala does not exist
[ERROR] import test.scala.HelloScalaProvider;
[ERROR] ^
[ERROR] /project/target/clover/src-instrumented/test/java/HelloJavaWorld.java:8: error: cannot find symbol
[ERROR] __CLR4_0_422ic5u5wnb.R.inc(3);final String provide = HelloScalaProvider.provide();
[ERROR] ^
[ERROR] symbol: variable HelloScalaProvider
[ERROR] location: class HelloJavaWorld
[ERROR] 2 errorsCause
Typically, project structure looks like this:
project/
src/
main/
java/
scala/
test/
java/
scala/Normally, Scala plugin looks for *.scala files in compilation source roots directory (here in src/*/scala). However, when Clover is enabled, it:
- instruments *.java files from original source roots and writes them to the target/clover/src-(test-)instrumented folders
- next it copies all other files from original source roots to target/clover/src-(test-)instrumented folders (to ensure that resource files won't be missing etc)
- next it removes original source roots and sets target/clover/src-(test-)instrumented as new roots
Because of this, when Scala compiler runs, it can't find *.scala files.
Resolution
Configure build-helper-maven-plugin to add Scala directories to compile source roots. Example:
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.9.1</version>
<executions>
<execution>
<id>add-source</id>
<phase>validate</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>src/main/scala</source>
</sources>
</configuration>
</execution>
<execution>
<id>add-test-source</id>
<phase>validate</phase>
<goals>
<goal>add-test-source</goal>
</goals>
<configuration>
<sources>
<source>src/test/scala</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>Since Scala is not supported, code coverage will be reported only for Java classes CLOV-932 - Provide support for the Scala language.
Last modified on Jan 23, 2025
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