Improve error messages

Author: jjohannes

src/main/java/org/gradlex/javamodule/dependencies/JavaModuleDependenciesExtension.java

@@ -264,7 +264,7 @@ public Provider<Dependency> create(String moduleName, SourceSet sourceSetWithMod
                 return dependency;
             } else {
                 getProject().getLogger().lifecycle(
-                        "[WARN] [Java Module Dependencies] javaModuleDependencies.moduleNameToGA.put(\"" + moduleName + "\", \"group:artifact\") mapping is missing.");
+                        "[WARN] [Java Module Dependencies] " + moduleName + "=group:artifact missing in " + getModulesProperties().get().getAsFile());
                 return null;
             }
         });
@@ -325,6 +325,9 @@ private Map<String, Object> findGav(String ga, String moduleName) {
         Optional<VersionConstraint> version = catalog == null ? empty() : catalog.findVersion(moduleName.replace('_', '.'));
         Map<String, Object> gav = new HashMap<>();
         String[] gaSplit = ga.split(":");
+        if (gaSplit.length < 2) {
+            throw new RuntimeException("Invalid mapping: " + moduleName + "="+ ga);
+        }
         gav.put(GAV.GROUP, gaSplit[0]);
         gav.put(GAV.ARTIFACT, gaSplit[1]);
         version.ifPresent(versionConstraint -> gav.put(GAV.VERSION, versionConstraint));

src/test/groovy/org/gradlex/javamodule/dependencies/test/WarningsTest.groovy

@@ -47,6 +47,6 @@ class WarningsTest extends Specification {
         when:
         def result = fail()
         then:
-        result.output.contains('[WARN] [Java Module Dependencies] javaModuleDependencies.moduleNameToGA.put("commons.math3", "group:artifact") mapping is missing.\n')
+        result.output.contains('[WARN] [Java Module Dependencies] commons.math3=group:artifact missing in')
     }
 }