Cannot find org.codehaus.commons.compiler.properties resource - apache-calcite

Question

I created a Maven project that includes a dependency to the Calcite JDBC driver, as well as source code for a Calcite CSV adapter.
<dependency>
<groupId>org.apache.calcite</groupId>
<artifactId>calcite-core</artifactId>
<version>1.20.0</version>
</dependency>
When I run from a JUnit test, I can query some CSV files using SQL. Very cool!
But I cannot get the JAR to work in SQL Workbench/J. The log file has this:
Caused by: java.lang.IllegalStateException: Unable to instantiate java compiler
at org.apache.calcite.rel.metadata.JaninoRelMetadataProvider.compile(JaninoRelMetadataProvider.java:434)
Caused by: java.lang.ClassNotFoundException: No implementation of org.codehaus.commons.compiler is on the class path. Typically, you'd have 'janino.jar', or 'commons-compiler-jdk.jar', or both on the classpath.
at org.codehaus.commons.compiler.CompilerFactoryFactory.getDefaultCompilerFactory(CompilerFactoryFactory.java:65)
SQL Workbench/J is successfully connecting, and I can see the list of CSV "tables" in the UI. But when I try to query them, I get the above error.
I found a link to someone having a similar problem, but did not see a resolution.
https://community.jaspersoft.com/questions/1035211/apache-calcite-jdbc-driver-jaspersoft
Also, here's the code that seems to be throwing the error:
public final
class CompilerFactoryFactory {
...
public static ICompilerFactory
getDefaultCompilerFactory() throws Exception {
if (CompilerFactoryFactory.defaultCompilerFactory != null) {
return CompilerFactoryFactory.defaultCompilerFactory;
}
Properties properties = new Properties();
InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream(
"org.codehaus.commons.compiler.properties"
);
if (is == null) {
throw new ClassNotFoundException(
"No implementation of org.codehaus.commons.compiler is on the class path. Typically, you'd have "
+ "'janino.jar', or 'commons-compiler-jdk.jar', or both on the classpath."
);
}
From what I can tell, the org.codehaus.commons.compiler.properties resource is just not being found when running under SQL Workbench/J, but for some reason it works in my code.
If I unzip the JAR file, I do see org.codehaus.commons.compiler.properties in the directory structure, so not sure why it's not being found.
Anyone else run into this problem?
Thanks for any help.