For certain setups with multiple user modules including ones with automatic module names in their manifest (no explicit module-info.class is provided) the source launcher fails with "Module M reads more than one module named N" error. For example:
```
Exception in thread "main" java.lang.module.ResolutionException: Module org.postgresql.jdbc reads more than one module named org.xerial.sqlitejdbc
        at java.base/java.lang.module.Resolver.resolveFail(Resolver.java:900)
        at java.base/java.lang.module.Resolver.checkExportSuppliers(Resolver.java:721)
        at java.base/java.lang.module.Resolver.finish(Resolver.java:380)
        at java.base/java.lang.module.Configuration.<init>(Configuration.java:139)
        at java.base/java.lang.module.Configuration.resolveAndBind(Configuration.java:493)
        at java.base/java.lang.module.Configuration.resolveAndBind(Configuration.java:297)
        at jdk.compiler/com.sun.tools.javac.launcher.MemoryContext.newClassLoaderFor(MemoryContext.java:229)
...
```

Original reporter: Ethan McCue