#1189 Added validation message for valueless constant definition

plugins/org.yakindu.sct.model.stext/src/org/yakindu/sct/model/stext/validation/STextJavaValidator.java

@@ -250,6 +250,10 @@ public class STextJavaValidator extends AbstractSTextJavaValidator implements ST
 		if (!definition.isConst())
 			return;
 		Expression initialValue = definition.getInitialValue();
+		if (initialValue == null) {
+			error(CONST_MUST_HAVE_VALUE_MSG, definition, null, CONST_MUST_HAVE_VALUE_CODE);
+			return;
+		}
 		List<Expression> toCheck = Lists.newArrayList(initialValue);
 		TreeIterator<EObject> eAllContents = initialValue.eAllContents();
 		while (eAllContents.hasNext()) {

plugins/org.yakindu.sct.model.stext/src/org/yakindu/sct/model/stext/validation/STextValidationMessages.java

@@ -50,6 +50,8 @@ public interface STextValidationMessages {
 	public static final String EXITPOINTSPEC_WITH_TRIGGER = "Transitions with an exit point spec does not have a trigger or guard.";
 	public static final String ASSIGNMENT_TO_VALUE = "Assignment constant not allowed.";
 	public static final String REFERENCE_TO_VARIABLE = "Cannot reference a variable in a constant initialization.";
+	public static final String CONST_MUST_HAVE_VALUE_MSG = "A constant definition must specify an initial value";
+	public static final String CONST_MUST_HAVE_VALUE_CODE = "ConstMustHaveAValue";
 	public static final String REFERENCE_CONSTANT_BEFORE_DEFINED = "Cannot reference a constant from different scope or before it is defined.";	
 	public static final String INTERNAL_DECLARATION_UNUSED = "Internal declaration is not used in statechart.";
 	public static final String ERROR_WRONG_ANNOTATION_TARGET_CODE = "WrongAnnotationTarget";

test-plugins/org.yakindu.sct.model.stext.test/src/org/yakindu/sct/model/stext/test/validation/STextJavaValidatorTest.java

@@ -607,8 +607,9 @@ public class STextJavaValidatorTest extends AbstractSTextValidationTest implemen
 		Statechart statechart = AbstractTestModelsUtil
 				.loadStatechart(VALIDATION_TESTMODEL_DIR + "ConstWithVariable.sct");
 		Diagnostic diagnostics = Diagnostician.INSTANCE.validate(statechart);
-		assertIssueCount(diagnostics, 2); //
+		assertIssueCount(diagnostics, 3); //
 		assertError(diagnostics, REFERENCE_TO_VARIABLE);
+		assertError(diagnostics, CONST_MUST_HAVE_VALUE_MSG);
 	}
 
 	@Test

test-plugins/org.yakindu.sct.test.models/testmodels/validation/ConstWithVariable.sct

@@ -1,101 +1,101 @@
-<?xml version="1.0" encoding="UTF-8"?>
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+<?xml version="1.0" encoding="UTF-8"?>
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