Add check for duplicate class definition in source files, fixes #422

resources/bytecode/javFiles/Bug422.jav

@@ -0,0 +1,2 @@
+public class Bug422 {}
+public class Bug422 {}

src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java

@@ -5,6 +5,7 @@ import de.dhbwstuttgart.bytecode.Codegen;
 import de.dhbwstuttgart.bytecode.FunNGenerator;
 import de.dhbwstuttgart.environment.CompilationEnvironment;
 import de.dhbwstuttgart.environment.DirectoryClassLoader;
+import de.dhbwstuttgart.exceptions.CompilerException;
 import de.dhbwstuttgart.exceptions.CompilerWarning;
 import de.dhbwstuttgart.exceptions.DebugException;
 import de.dhbwstuttgart.exceptions.WarningsException;
@@ -171,6 +172,8 @@ public class JavaTXCompiler {
 
 				var numberOfGenerics = decl == null ? 0 : decl.genericTypeVar().size();
 				var className = pkgName + (!pkgName.isEmpty() ? "." : "") + name;
+				if (classRegistry.contains(className))
+					throw new CompilerException("Duplicate class definition: " + className);
 				classRegistry.addName(className, numberOfGenerics);
 				input.add(classRegistry.getName(className));
 			}

src/main/java/de/dhbwstuttgart/exceptions/CompilerException.java

@@ -0,0 +1,7 @@
+package de.dhbwstuttgart.exceptions;
+
+public class CompilerException extends RuntimeException {
+    public CompilerException(String message) {
+        super(message);
+    }
+}

src/test/java/TestComplete.java

@@ -1,6 +1,8 @@
 
 import de.dhbwstuttgart.bytecode.CodeGenException;
 import de.dhbwstuttgart.core.ConsoleInterface;
+import de.dhbwstuttgart.exceptions.CompilerException;
+import de.dhbwstuttgart.exceptions.DebugException;
 import de.dhbwstuttgart.exceptions.WarningsException;
 import de.dhbwstuttgart.util.Logger;
 import de.dhbwstuttgart.util.Logger.LogLevel;
@@ -1704,4 +1706,14 @@ public class TestComplete {
         var clazz = classFiles.get("Bug406");
         clazz.getDeclaredMethod("main", List.class).invoke(null, List.of());
     }
+
+    @Test
+    public void testBug422() throws Exception {
+        try {
+            var classFiles = generateClassFiles(createClassLoader(), "Bug422.jav");
+            fail("Shouldn't compile!");
+        } catch (CompilerException e) {
+            assertEquals("Duplicate class definition: Bug422", e.getMessage());
+        }
+    }
 }